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PMID:13028 | [Pressor action of propranolol; with special reference to relationship between the pressor action and peripheral vascular tone]. | We showed in previous studies that pro pranolol produced a pressor action in the rat, and that this action was also observed in the spinal rat infused with adrenaline, noradrenaline and a mixture of isoproterenol and vasopressin, but not with vasopression alone. The action was also observed in the guinea pig infused with adrenergic beta-stimulants. In the present work, conditions in the peripheral vessels in which propranolol observed in the spinal rat infused with a mixture of various doses of isoproterenol and vasopressin. The effect of propranolol on the blood pressure in guinea pigs and rabbits with a reduced vasoconstrictive tone in the peripheral vascular beds with alpha-blockade was studied. Propranolol produced a pressor action in the spinal rat infused with a mixture of isoproterenol and vasopressin, and the magnitude of the rise depended on the mixing rate of the doses of these two drugs. The drug also produced a sustained rise in blood pressure in guinea pigs and rabbits treated with alpha-blockers. Thus, it is concluded that propranolol produces a marked pressor action when peripheral vessels are maintained in conditions with an appropriate constrictive and beta-adrenoceptive vasodilator tone. | [Pressor action of propranolol; with special reference to relationship between the pressor action and peripheral vascular tone]. We showed in previous studies that pro pranolol produced a pressor action in the rat, and that this action was also observed in the spinal rat infused with adrenaline, noradrenaline and a mixture of isoproterenol and vasopressin, but not with vasopression alone. The action was also observed in the guinea pig infused with adrenergic beta-stimulants. In the present work, conditions in the peripheral vessels in which propranolol observed in the spinal rat infused with a mixture of various doses of isoproterenol and vasopressin. The effect of propranolol on the blood pressure in guinea pigs and rabbits with a reduced vasoconstrictive tone in the peripheral vascular beds with alpha-blockade was studied. Propranolol produced a pressor action in the spinal rat infused with a mixture of isoproterenol and vasopressin, and the magnitude of the rise depended on the mixing rate of the doses of these two drugs. The drug also produced a sustained rise in blood pressure in guinea pigs and rabbits treated with alpha-blockers. Thus, it is concluded that propranolol produces a marked pressor action when peripheral vessels are maintained in conditions with an appropriate constrictive and beta-adrenoceptive vasodilator tone. | [
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PMID:13029 | [Effects of a benzodiazepine derivative, MS4101, on emotional behaviour of untamed cats]. | Effects of MS4101 on emotional behaviour in untamed cats were studied and compared with those of diazepam. Offensive behaviour, i.e., whine response to a rod presented in front of the snout and blowing air on back hair was markedly observed, and whine, attacking and biting responses to tapping with a rod on the back in these cats were marked. Defensive behaviour, i.e., hissing, crouching body, ear flattening to blowing air on back hair, a rod presented and tapping was markedly observed. From 30 min after MS4101 and diazepam in doses of 2 approximately 4 mg/kg i.p., offensive behaviour in untamed cats was depressed. ID50 (50% of inhibition dose) of offensive behaviour for MS4101 and diazepam was 2.40 (1.95 approximately 2.95) mg/kg i.p. and 0.96 (0.69 approximately 1.34) mg/kg i.p., respectively. MS4101 and diazepam in doses of 2 approximately 4 mg/kg i.p. decreased the offensive behaviour. ID50 of defensive behaviour for MS4101 and diazepam was 3.00 (2.46 approximately 3.66) mg/kg i.p. and 1.45 (1.14 approximately 1.84) mg/kg i.p., respectively. Both MS4101 and diazepam exhibited muscle relaxant effects. Here, diazepam was more effective than MS4101. ED50 of muscle relaxant activity for MS4101 and diazepam was 4.30 (3.03 approximately 6.11) mg/kg i.p., 7.40 (5.04 approximately 10.66) mg/kg i.p., respectively. A single administration of MS4101 and of diazepam in doses 2 mg/kg i.p. enhanced food intake. | [Effects of a benzodiazepine derivative, MS4101, on emotional behaviour of untamed cats]. Effects of MS4101 on emotional behaviour in untamed cats were studied and compared with those of diazepam. Offensive behaviour, i.e., whine response to a rod presented in front of the snout and blowing air on back hair was markedly observed, and whine, attacking and biting responses to tapping with a rod on the back in these cats were marked. Defensive behaviour, i.e., hissing, crouching body, ear flattening to blowing air on back hair, a rod presented and tapping was markedly observed. From 30 min after MS4101 and diazepam in doses of 2 approximately 4 mg/kg i.p., offensive behaviour in untamed cats was depressed. ID50 (50% of inhibition dose) of offensive behaviour for MS4101 and diazepam was 2.40 (1.95 approximately 2.95) mg/kg i.p. and 0.96 (0.69 approximately 1.34) mg/kg i.p., respectively. MS4101 and diazepam in doses of 2 approximately 4 mg/kg i.p. decreased the offensive behaviour. ID50 of defensive behaviour for MS4101 and diazepam was 3.00 (2.46 approximately 3.66) mg/kg i.p. and 1.45 (1.14 approximately 1.84) mg/kg i.p., respectively. Both MS4101 and diazepam exhibited muscle relaxant effects. Here, diazepam was more effective than MS4101. ED50 of muscle relaxant activity for MS4101 and diazepam was 4.30 (3.03 approximately 6.11) mg/kg i.p., 7.40 (5.04 approximately 10.66) mg/kg i.p., respectively. A single administration of MS4101 and of diazepam in doses 2 mg/kg i.p. enhanced food intake. | [
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|
PMID:13030 | [The radiological diagnosis of shock lung (author's transl)]. | So-called "shock lung" has typical pathological findings; radiologically it is characterised at first by interstitial, late by alveolar pulmonary oedema. This has been shown by a number of case reports. In addition to shock, however, certain intoxications and all forms of left heart failure produce the radiological changes of pulmonary oedema. Transient hyperhydration of the lungs following infusion therapy causes signs of pulmonary oedema which disappear as soon as the fluid balance becomes normal. The radiographic findings of pulmonary oedema correlate well with the intensity and extent of the pathological changes. The radiologist is therefore in a position to evaluate the severity of the shock lung; this is a valuable addition to the clinical findings and the results of physiological tests and blood gas analysis. It has to be emphasised that the radiological changes appear at an early stage, in any case much sooner than the clinical features. Radiological findings may be present without abnormalities on oscultation or percussion. Radiographs of the lungs are therefore indicated in all patients who may be subject to shock lung, particularly if they suffer from undiagnosed hyperventilation. | [The radiological diagnosis of shock lung (author's transl)]. So-called "shock lung" has typical pathological findings; radiologically it is characterised at first by interstitial, late by alveolar pulmonary oedema. This has been shown by a number of case reports. In addition to shock, however, certain intoxications and all forms of left heart failure produce the radiological changes of pulmonary oedema. Transient hyperhydration of the lungs following infusion therapy causes signs of pulmonary oedema which disappear as soon as the fluid balance becomes normal. The radiographic findings of pulmonary oedema correlate well with the intensity and extent of the pathological changes. The radiologist is therefore in a position to evaluate the severity of the shock lung; this is a valuable addition to the clinical findings and the results of physiological tests and blood gas analysis. It has to be emphasised that the radiological changes appear at an early stage, in any case much sooner than the clinical features. Radiological findings may be present without abnormalities on oscultation or percussion. Radiographs of the lungs are therefore indicated in all patients who may be subject to shock lung, particularly if they suffer from undiagnosed hyperventilation. | [
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|
PMID:13031 | [The spina bifida child with special reference to urologic disease]. | From the view of the urological diseases a new conception of the spina bifida cystica is represented. The first part contains informations on etiology, pathological anatomy and physio-pathology. Considering the urological diseases (neurogenic bladder with incontinence and residual urine, vesico ureteric reflux and chronic pyelonephritis) special importance is attached to the pathogenesis. Within the therapeutic methods the treatment with the alpha-blocking agent Phenoxybenzamin (Dibenzyran, Röhm Pharma GmbH, Darmstadt) is emphasized as the actual therapy of the neurogenic bladder. The operative indication of the Ileum-Conduit (Bricker-) is mentioned. An analysis of 125 spina bifida-patients with the pathological findings in the kidneys and the urinary tract is given. | [The spina bifida child with special reference to urologic disease]. From the view of the urological diseases a new conception of the spina bifida cystica is represented. The first part contains informations on etiology, pathological anatomy and physio-pathology. Considering the urological diseases (neurogenic bladder with incontinence and residual urine, vesico ureteric reflux and chronic pyelonephritis) special importance is attached to the pathogenesis. Within the therapeutic methods the treatment with the alpha-blocking agent Phenoxybenzamin (Dibenzyran, Röhm Pharma GmbH, Darmstadt) is emphasized as the actual therapy of the neurogenic bladder. The operative indication of the Ileum-Conduit (Bricker-) is mentioned. An analysis of 125 spina bifida-patients with the pathological findings in the kidneys and the urinary tract is given. | [
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|
PMID:13032 | [The development of vaccination as demonstrated on the development of the Bavarian State Vaccination Institute in the 19th and 20th centuries]. | In 1801 the smallpox vaccination has been introduced in Bavaria by order of the Duke Franz Joseph. He appointed a Medical Superintendent, responsible for smallpox vaccinations for the whole country. This was the hour of birth for the Institute, too. The Institute developed quickly to a point of crystallization in the field of prophylactic medicine, research on infectious diseases and social pediatrics. By this Institute the "Retrovaccine" against smallpox was introduced 1856. 1967 -- 1976 an attenuated life smallpox-vaccine (MVA) has been developed. Some years ago the activities of the Institute had been focussed into research of complications after vaccinations and up to date, on the pathogenesis of Multiple Sclerosis. A historical review demonstrates the development of the Institute in the past up to modern activities in research, teaching students and postgraduate education and in medical practice. | [The development of vaccination as demonstrated on the development of the Bavarian State Vaccination Institute in the 19th and 20th centuries]. In 1801 the smallpox vaccination has been introduced in Bavaria by order of the Duke Franz Joseph. He appointed a Medical Superintendent, responsible for smallpox vaccinations for the whole country. This was the hour of birth for the Institute, too. The Institute developed quickly to a point of crystallization in the field of prophylactic medicine, research on infectious diseases and social pediatrics. By this Institute the "Retrovaccine" against smallpox was introduced 1856. 1967 -- 1976 an attenuated life smallpox-vaccine (MVA) has been developed. Some years ago the activities of the Institute had been focussed into research of complications after vaccinations and up to date, on the pathogenesis of Multiple Sclerosis. A historical review demonstrates the development of the Institute in the past up to modern activities in research, teaching students and postgraduate education and in medical practice. | [
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|
PMID:13033 | [Smallpox vaccine, then and now. From the "cow lymphe" to the cell-culture vaccine]. | There have been few changes in the preparation of smallpox vaccine since Eduard Jenner described his method of preventive inoculation in 1798. Jenner's vaccine, "the matter", was maintained in man by arm to arm passage. The only major achievement in production methods was the introduction of an animal host for virus propagation. The skin of living calves or sheep was inoculated with seed virus and the "pulp" harvested three to four days later. The disadvantages of this procedure are evident: massive bacterial contamination in spite of rigorous cleanliness and excessive amounts of undesired tissue debris in the crude material to be used for vaccine production. In spite of these obvious disadvantages the method is still in use all over the world. Advances in tissue culture techniques have led to the production of all modern vaccines for use in animals and in the human from this substrate with low initial content of foreign protein and of primary sterility. The only exception today is conventional smallpox vaccine. Sporadic attempts to produce smallpox vaccine in tissue culture have been recently and successfully made in England, Holland and Yugoslavia. The Bavarian State Institute of Vaccination has adopted Vaccinia strain Elstree to primary cultures of chick embryo fibroblasts. The virus propagation in roller bottles permits the economical production of a high titered vaccine with a stability equal to that of calf origin. The cell culture harvest is bacteriologically steril and has a minimal content of foreign protein. Within the past two years this cell culture vaccine has totally replaced the old "calf lymph". Vaccination takes are equal, complications have so far not come to our attention. | [Smallpox vaccine, then and now. From the "cow lymphe" to the cell-culture vaccine]. There have been few changes in the preparation of smallpox vaccine since Eduard Jenner described his method of preventive inoculation in 1798. Jenner's vaccine, "the matter", was maintained in man by arm to arm passage. The only major achievement in production methods was the introduction of an animal host for virus propagation. The skin of living calves or sheep was inoculated with seed virus and the "pulp" harvested three to four days later. The disadvantages of this procedure are evident: massive bacterial contamination in spite of rigorous cleanliness and excessive amounts of undesired tissue debris in the crude material to be used for vaccine production. In spite of these obvious disadvantages the method is still in use all over the world. Advances in tissue culture techniques have led to the production of all modern vaccines for use in animals and in the human from this substrate with low initial content of foreign protein and of primary sterility. The only exception today is conventional smallpox vaccine. Sporadic attempts to produce smallpox vaccine in tissue culture have been recently and successfully made in England, Holland and Yugoslavia. The Bavarian State Institute of Vaccination has adopted Vaccinia strain Elstree to primary cultures of chick embryo fibroblasts. The virus propagation in roller bottles permits the economical production of a high titered vaccine with a stability equal to that of calf origin. The cell culture harvest is bacteriologically steril and has a minimal content of foreign protein. Within the past two years this cell culture vaccine has totally replaced the old "calf lymph". Vaccination takes are equal, complications have so far not come to our attention. | [
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|
PMID:13038 | Role of urinary solutes in natural immunity to gonorrhea. | Natural resistance of the male urethra to gonococci has not been explained by classical immune mechanisms but could result from antibacterial properties of urine. Accordingly, we measured survival in midmorning urine of 10(7) F-62 T2 gonococci per ml by serial dilutions and plate counts. Fifteen killer urines from eight people all killed greater than 3 logs (average, 5.3), and 13 of 15 were sterilized. Fourteen nonkiller (inhibitor) urines from seven subjects allowed no growth. Killer urines were more acidic (pH 5.4 versus 6.4) and more concentrated (861 versus 717 mosmol/kg) than nonkillers. Upon addition of hydrogen ion, urea, and sodium chloride to urines and broth, pH proved to be the major killing factor, but urea and NaCl were also bactericidal. Susceptibility to urine bactericidal power did not vary with colony type (T2 versus T4) or strain (F-62 versus two fresh isolates). Killing was rapid (0.5 to 3 h) and not bacteriolytic. Escherichia coli multiplied 10-fold in urines that inhibited growth of gonococci. Thus, the bacteriostatic effect of urine may explain why gonococci do not infect the bladder and kidney during gonorrhea. The bactericidal properties of urine may contribute to resistance against gonococcal urethritis. | Role of urinary solutes in natural immunity to gonorrhea. Natural resistance of the male urethra to gonococci has not been explained by classical immune mechanisms but could result from antibacterial properties of urine. Accordingly, we measured survival in midmorning urine of 10(7) F-62 T2 gonococci per ml by serial dilutions and plate counts. Fifteen killer urines from eight people all killed greater than 3 logs (average, 5.3), and 13 of 15 were sterilized. Fourteen nonkiller (inhibitor) urines from seven subjects allowed no growth. Killer urines were more acidic (pH 5.4 versus 6.4) and more concentrated (861 versus 717 mosmol/kg) than nonkillers. Upon addition of hydrogen ion, urea, and sodium chloride to urines and broth, pH proved to be the major killing factor, but urea and NaCl were also bactericidal. Susceptibility to urine bactericidal power did not vary with colony type (T2 versus T4) or strain (F-62 versus two fresh isolates). Killing was rapid (0.5 to 3 h) and not bacteriolytic. Escherichia coli multiplied 10-fold in urines that inhibited growth of gonococci. Thus, the bacteriostatic effect of urine may explain why gonococci do not infect the bladder and kidney during gonorrhea. The bactericidal properties of urine may contribute to resistance against gonococcal urethritis. | [
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|
PMID:13039 | Effects of pneumococcal mucopeptide and capsular polysaccharide on phagocytosis. | Pneumoccal cell wall and capsular products from eight serotypes were tested for their ability to inhibit polymorphonuclear neutrophil killing of the same eight pneumococcal strains. Crude pneumococcal cell wall preparations from all serotypes inhibited phagocytic killing of several pneumococcal serotypes, and were just as effective with heterologous as with homologous strains. Phagocytosis dependent on heat-labile serum factors was inhibited, whereas phagocytosis not dependent on heat-labile factors was not significantly affected. These findings were compatible with inhibition of complement consumption. The inhibitory activity was found in a purified cell wall mucopeptide, whereas purified capsular polysaccharides failed to inhibit phagocytosis. | Effects of pneumococcal mucopeptide and capsular polysaccharide on phagocytosis. Pneumoccal cell wall and capsular products from eight serotypes were tested for their ability to inhibit polymorphonuclear neutrophil killing of the same eight pneumococcal strains. Crude pneumococcal cell wall preparations from all serotypes inhibited phagocytic killing of several pneumococcal serotypes, and were just as effective with heterologous as with homologous strains. Phagocytosis dependent on heat-labile serum factors was inhibited, whereas phagocytosis not dependent on heat-labile factors was not significantly affected. These findings were compatible with inhibition of complement consumption. The inhibitory activity was found in a purified cell wall mucopeptide, whereas purified capsular polysaccharides failed to inhibit phagocytosis. | [
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|
PMID:13040 | Glucosyltransferase production by Streptococcus sanguis 804 (NCTC 10904). | Streptococcus sanguis 804 (NCTC 10904) was grown ih batch culture at constant pH. and the glucosyltransferase activity of the supernatant was assayed over a 40-h growth period. The optimum pH for enzyme production was 7.0 to 7.2. During growth of the culture, three reproducible phases of enzyme activity were observed. The polysaccharides synthesized during each of these phases were characterized as dextran-like glucans by analysis of acid hydrolysates, gas-liquid chromatography, and a specific aggregation technique. The glucans were studied further by infrared spectroscopy, enzymic degradation, and periodate oxidation. Differences in the proportions of alpha-(1 leads to 3)- and alpha-(1 leads to 6)-linkages were observed. The results suggest that glucan synthesis by S. sanguis involves a multienzyme system. | Glucosyltransferase production by Streptococcus sanguis 804 (NCTC 10904). Streptococcus sanguis 804 (NCTC 10904) was grown ih batch culture at constant pH. and the glucosyltransferase activity of the supernatant was assayed over a 40-h growth period. The optimum pH for enzyme production was 7.0 to 7.2. During growth of the culture, three reproducible phases of enzyme activity were observed. The polysaccharides synthesized during each of these phases were characterized as dextran-like glucans by analysis of acid hydrolysates, gas-liquid chromatography, and a specific aggregation technique. The glucans were studied further by infrared spectroscopy, enzymic degradation, and periodate oxidation. Differences in the proportions of alpha-(1 leads to 3)- and alpha-(1 leads to 6)-linkages were observed. The results suggest that glucan synthesis by S. sanguis involves a multienzyme system. | [
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|
PMID:13041 | Production and detection of staphylococcal elastase. | The optimum conditions were determined for the production and detection of staphylococcal elastase from Staphylococcus epidermidis. Optimum production and recovery took place when the dialysis membrane technique was utilized with brain heart infusion agar incubated for 44 h under 15% CO2 and harvested in physiological saline. Near-optimal production took place by 28 h, and this was found more useful for routine use. Incorporation of elastin into the culture medium or the inoculum did not result in higher levels of elastase production. The detection system consisted of 0.25% particulate elastin suspended in a pH 7.0, 0.05 M tris(hydroxymethyl)aminomethane-hydrochloride-buffered solidified plated medium. Crude undialyzed elastase was best detected when the medium contained either agarose and 10(-3) M calcium or purified agar without additional additives. Crude dialyzed elastase was best detected when the medium contained agarose and 10(-3) M disodium ethylenediaminetetraacetic acid. | Production and detection of staphylococcal elastase. The optimum conditions were determined for the production and detection of staphylococcal elastase from Staphylococcus epidermidis. Optimum production and recovery took place when the dialysis membrane technique was utilized with brain heart infusion agar incubated for 44 h under 15% CO2 and harvested in physiological saline. Near-optimal production took place by 28 h, and this was found more useful for routine use. Incorporation of elastin into the culture medium or the inoculum did not result in higher levels of elastase production. The detection system consisted of 0.25% particulate elastin suspended in a pH 7.0, 0.05 M tris(hydroxymethyl)aminomethane-hydrochloride-buffered solidified plated medium. Crude undialyzed elastase was best detected when the medium contained either agarose and 10(-3) M calcium or purified agar without additional additives. Crude dialyzed elastase was best detected when the medium contained agarose and 10(-3) M disodium ethylenediaminetetraacetic acid. | [
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|
PMID:13047 | Side effects on fetus and infant of psychotropic drug use during pregnancy. | Psychotropic drugs are used frequently for the treatment of emotional as well as other disorders. With usage so widespread, many pregnant women receive psychotropic drugs. Maternal ingestion of these drugs may produce, in the fetus, side effects including withdrawal symptoms. Withdrawal signs in the fetus as a result of maternal intake of opiates, hypnotics, analgesics, and tricyclic antidepressant drugs have been reported. Fetal side effects can occur by maternal ingestion of nuroleptic medications, lithium, antidepressants, anxiolytic sedatives, anticonvulsants, and bromides. The author feels that even though these drugs are generally safe, they must only be administered to pregnant women when absolutely needed, and then under vigilance. | Side effects on fetus and infant of psychotropic drug use during pregnancy. Psychotropic drugs are used frequently for the treatment of emotional as well as other disorders. With usage so widespread, many pregnant women receive psychotropic drugs. Maternal ingestion of these drugs may produce, in the fetus, side effects including withdrawal symptoms. Withdrawal signs in the fetus as a result of maternal intake of opiates, hypnotics, analgesics, and tricyclic antidepressant drugs have been reported. Fetal side effects can occur by maternal ingestion of nuroleptic medications, lithium, antidepressants, anxiolytic sedatives, anticonvulsants, and bromides. The author feels that even though these drugs are generally safe, they must only be administered to pregnant women when absolutely needed, and then under vigilance. | [
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PMID:13048 | Stability of mammalian lens phosphofructokinase. | Two interconvertible phosphofructokinase (PFK) forms were found in rat and human lenses; whereas only one predominant form was found in calf lens. PFK isolated from these lenses possessed a common property, i.e., pH-dependent cold (or acid) lability. The inactivation was prevented by including either adenosine triphosphate (ATP) or fructose-6-phosphate (fru-6-P) in the incubating media. The protective effect of ATP or fru-6-P was complete in rat or calf lenses. In human lens, although fru-6-P was fully protective, ATP protected only partially. The inactivation could be reversed by addition of fru-6-P, but not ATP, to the incubating media at 37.5 degrees C. Lens organ culture studies showed that the depletion of lenticular ATP seemed to precipitate the loss of PFK. | Stability of mammalian lens phosphofructokinase. Two interconvertible phosphofructokinase (PFK) forms were found in rat and human lenses; whereas only one predominant form was found in calf lens. PFK isolated from these lenses possessed a common property, i.e., pH-dependent cold (or acid) lability. The inactivation was prevented by including either adenosine triphosphate (ATP) or fructose-6-phosphate (fru-6-P) in the incubating media. The protective effect of ATP or fru-6-P was complete in rat or calf lenses. In human lens, although fru-6-P was fully protective, ATP protected only partially. The inactivation could be reversed by addition of fru-6-P, but not ATP, to the incubating media at 37.5 degrees C. Lens organ culture studies showed that the depletion of lenticular ATP seemed to precipitate the loss of PFK. | [
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|
PMID:13049 | Methenamine and its salts as urinary tract antiseptics: variables affecting the antibacterial activity of formaldehyde, mandelic acid, and hippuric acid in vitro. | The activities of formaldehyde and of mandelic and hippuric acids, alone and in combination, have been tested against some 300 strains of bacteria typical of those causing urinary tract infections. In a chemically defined medium, which resembles urine in many respects, formaldehyde had a mean minimal inhibitory concentration of 13 mug per ml. Activity was several fold lower in media (nutrient agar and tryptic soy agar) that contained significant amounts of protein. The activity of formaldehyde is virtually unaffected by pH in the range of 5 to 8. Mandelic and hippuric acids (2 mg per ml) have limited antimicrobial activity at acid pH values only. The combination of formaldehyde with mandelic acid (2 mg per ml) was additive, most markedly at pH 5; the formaldehyde-hippuric acid combination, however, did not appear to be additive. Our findings suggest that, at pH values between 5 and 6, an antibacterial concentration of formaldehyde will be generated from methenamine within approximately 1 hr after being excreted into the urine. | Methenamine and its salts as urinary tract antiseptics: variables affecting the antibacterial activity of formaldehyde, mandelic acid, and hippuric acid in vitro. The activities of formaldehyde and of mandelic and hippuric acids, alone and in combination, have been tested against some 300 strains of bacteria typical of those causing urinary tract infections. In a chemically defined medium, which resembles urine in many respects, formaldehyde had a mean minimal inhibitory concentration of 13 mug per ml. Activity was several fold lower in media (nutrient agar and tryptic soy agar) that contained significant amounts of protein. The activity of formaldehyde is virtually unaffected by pH in the range of 5 to 8. Mandelic and hippuric acids (2 mg per ml) have limited antimicrobial activity at acid pH values only. The combination of formaldehyde with mandelic acid (2 mg per ml) was additive, most markedly at pH 5; the formaldehyde-hippuric acid combination, however, did not appear to be additive. Our findings suggest that, at pH values between 5 and 6, an antibacterial concentration of formaldehyde will be generated from methenamine within approximately 1 hr after being excreted into the urine. | [
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PMID:13050 | Interaction of uricine with uric acid and its effect on uric acid precipitation. | Uricine is a yellow-red pigment isolated from uric acid stones where it is always found. It binds to the uric acid, as shown by gel chromatography, at constant uric acid elution. It also increases the capacity of the uric acid to form larger aggregates and therefore the capacity of the uric acid to precipitate is enhanced. The uric acid-uricine aggregates may be separated by high speed sucrose centrifugation gradients. | Interaction of uricine with uric acid and its effect on uric acid precipitation. Uricine is a yellow-red pigment isolated from uric acid stones where it is always found. It binds to the uric acid, as shown by gel chromatography, at constant uric acid elution. It also increases the capacity of the uric acid to form larger aggregates and therefore the capacity of the uric acid to precipitate is enhanced. The uric acid-uricine aggregates may be separated by high speed sucrose centrifugation gradients. | [
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PMID:13054 | Adenosine triphosphate catabolism in homogenates of rat secretory enamel organs incubated in histochemical lead media. | To investigate how lead, when used as trapping agent, influences the ATP hydrolysis and to study how ATP is catalyzed in histochemical systems, homogenized secretory enamel organs were incubated in histochemical [3H]-ATP media. Aliquots from the media were taken after 3, 10, 20 and 30 min, the ATP and formed metabolites were separated by electrophoresis and radiometrically quantitated. In media lacking both lead and homogenate 2% of the ATP was spontaneously hydrolyzed during 30 min incubation at room temperature. The presence of lead caused an additional 8% hydrolysis at pH 7.2 and an additional 20% hydrolysis at pH 9.4. In the presence of homogenate, however, lead caused a net decrease of the hydrolysis of ATP as well as of ADP and AMP. This enzyme inhibition varied from around zero to some 80%, depending on pH and substrated involved. In homogenate-containing lead media, at both pH 7.2 AND 9.4, ATP was rapidly hydrolyzed primarily to ADP and subsequently to AMP and adenosine and/or inosine. After 5--10 min ADP constituted the predominant substrate at both pH:s. At pH 7.2 ADP remained so for the rest of the incubation, whereas at pH 9.4 AMP was predominant substrate at the end of the incubation. AMP was the finan catabolic product in experiments at pH 7.2, and adenosine and/or inosine at pH 9.4. Inorganic phosphate was liberated almost linearly during the whole incubation period. The results indicate that histochemical studies of substrate specific ATP-ases should be performed with short incubation times and, when high specific activities are present, in large quantities of incubation media to reduce interference by ADP and AMP hydrolyzing enzymes. | Adenosine triphosphate catabolism in homogenates of rat secretory enamel organs incubated in histochemical lead media. To investigate how lead, when used as trapping agent, influences the ATP hydrolysis and to study how ATP is catalyzed in histochemical systems, homogenized secretory enamel organs were incubated in histochemical [3H]-ATP media. Aliquots from the media were taken after 3, 10, 20 and 30 min, the ATP and formed metabolites were separated by electrophoresis and radiometrically quantitated. In media lacking both lead and homogenate 2% of the ATP was spontaneously hydrolyzed during 30 min incubation at room temperature. The presence of lead caused an additional 8% hydrolysis at pH 7.2 and an additional 20% hydrolysis at pH 9.4. In the presence of homogenate, however, lead caused a net decrease of the hydrolysis of ATP as well as of ADP and AMP. This enzyme inhibition varied from around zero to some 80%, depending on pH and substrated involved. In homogenate-containing lead media, at both pH 7.2 AND 9.4, ATP was rapidly hydrolyzed primarily to ADP and subsequently to AMP and adenosine and/or inosine. After 5--10 min ADP constituted the predominant substrate at both pH:s. At pH 7.2 ADP remained so for the rest of the incubation, whereas at pH 9.4 AMP was predominant substrate at the end of the incubation. AMP was the finan catabolic product in experiments at pH 7.2, and adenosine and/or inosine at pH 9.4. Inorganic phosphate was liberated almost linearly during the whole incubation period. The results indicate that histochemical studies of substrate specific ATP-ases should be performed with short incubation times and, when high specific activities are present, in large quantities of incubation media to reduce interference by ADP and AMP hydrolyzing enzymes. | [
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|
PMID:13055 | Immunotherapy in two foals with combined immunodeficiency, resulting in graft versus host reaction. | Immunotherapy was attempted in 2 Arabian foals with combined immunodeficiency. One foal was given a transplant of bone marrow from a selected full sibling, and 1 foal was given a fetal thymus transplant. Both foals died. Genetic evidence was obtained for survival of the transplanted tissues in both cases; however, a graft versus host reaction developed in the foal given the fetal thymus transplant. | Immunotherapy in two foals with combined immunodeficiency, resulting in graft versus host reaction. Immunotherapy was attempted in 2 Arabian foals with combined immunodeficiency. One foal was given a transplant of bone marrow from a selected full sibling, and 1 foal was given a fetal thymus transplant. Both foals died. Genetic evidence was obtained for survival of the transplanted tissues in both cases; however, a graft versus host reaction developed in the foal given the fetal thymus transplant. | [
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|
PMID:13053 | Treatment of chronic ventricular arrhythmias [proceedings]. | Treatment of ventricular arrhythmias at the present time is difficult and requires a strong commitment on the part of the physician and the patient. Adequate documentation of the arrhythmia with continuous ECG recordings (Holter recordings), preferably for 24 hours, should be performed in each case. Exercise testing can be utilized in selected patients, but is generally inferior to the Holter technique. Underlying cardiac pathology should be searched for, utilizing echocardiography in all patients and coronary angiography and left ventriculography in patients with more severe ventricular tachycardias. Estimation of the prognostic significance of the VPBs must be made in the context of the underlying disease, and goals for treatment must be set. Treatment in all cases first requires measures to avoid known precipitating factors. If antiarrhythmic therapy is utilized, a systematic empirical trial of available agents should be undertaken, utilizing repeated Holter monitoring to document effectiveness. Serum levels of the antiarrhythmic medications should be measured in most cases. Combinations of antiarrhythmic agents can be employed if the need is great, but the agents singly are ineffective. If treatment is determined to be ineffective, it should be discontinued. Surgical techniques may be useful in cases of refractory ventricular tachycardia, and they include overdrive pacing, surgical sympathectomy, or ventricular aneurysmectomy with or without coronary bypass. Coronary bypass alone or resection of a hypokinetic but not aneurysmal area of myocardium may be successful in some cases, but the results are less predictable than when a true aneurysm is resected. Electrophysiologic studies, performed as part of the preoperative evaluation and provoking a self-perpetuating ventricular tachycardia, may permit selection of patients suitable for ventriculotomy to interrupt the re-entry pathway. At present, this must be considered experimental and is performed in only a few centers equipped for the required complex epicardial mapping. Surgery has not been shown to affect complex VPBs outside the setting of acute ischemia. Control of ventricular arrhythmias requires a highly individualistic approach with documentation of effectiveness. | Treatment of chronic ventricular arrhythmias [proceedings]. Treatment of ventricular arrhythmias at the present time is difficult and requires a strong commitment on the part of the physician and the patient. Adequate documentation of the arrhythmia with continuous ECG recordings (Holter recordings), preferably for 24 hours, should be performed in each case. Exercise testing can be utilized in selected patients, but is generally inferior to the Holter technique. Underlying cardiac pathology should be searched for, utilizing echocardiography in all patients and coronary angiography and left ventriculography in patients with more severe ventricular tachycardias. Estimation of the prognostic significance of the VPBs must be made in the context of the underlying disease, and goals for treatment must be set. Treatment in all cases first requires measures to avoid known precipitating factors. If antiarrhythmic therapy is utilized, a systematic empirical trial of available agents should be undertaken, utilizing repeated Holter monitoring to document effectiveness. Serum levels of the antiarrhythmic medications should be measured in most cases. Combinations of antiarrhythmic agents can be employed if the need is great, but the agents singly are ineffective. If treatment is determined to be ineffective, it should be discontinued. Surgical techniques may be useful in cases of refractory ventricular tachycardia, and they include overdrive pacing, surgical sympathectomy, or ventricular aneurysmectomy with or without coronary bypass. Coronary bypass alone or resection of a hypokinetic but not aneurysmal area of myocardium may be successful in some cases, but the results are less predictable than when a true aneurysm is resected. Electrophysiologic studies, performed as part of the preoperative evaluation and provoking a self-perpetuating ventricular tachycardia, may permit selection of patients suitable for ventriculotomy to interrupt the re-entry pathway. At present, this must be considered experimental and is performed in only a few centers equipped for the required complex epicardial mapping. Surgery has not been shown to affect complex VPBs outside the setting of acute ischemia. Control of ventricular arrhythmias requires a highly individualistic approach with documentation of effectiveness. | [
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PMID:13056 | Microbial acetylation of M factor of virginiamycin. | The M component of virginiamycin was found to be modified by whole cells or cell-free enzyme preparations of a Staphylococcus aureus strain. It was shown that this reaction proceeds by enzymatic acetylation of the secondary alcoholic function of the molecule, followed by a rapid chemical degradation of the O-acetylated product. | Microbial acetylation of M factor of virginiamycin. The M component of virginiamycin was found to be modified by whole cells or cell-free enzyme preparations of a Staphylococcus aureus strain. It was shown that this reaction proceeds by enzymatic acetylation of the secondary alcoholic function of the molecule, followed by a rapid chemical degradation of the O-acetylated product. | [
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|
PMID:13058 | Rapid, shallow breathing after Ascaris suum antigen inhalation: role of vagus nerves. | In five treadmill-exercising, unsedated dogs, we studied the effect of inhaled Ascaris suum antigen aerosols on minute volume of ventilation (VE), respiratory frequency (f), tidal volume (VT), total pulmonary resistance (RL), and dynamic pulmonary compliance (CLdyn), before and during cooling of the vagus nerves. With the vagi warm, inhaled antigen increased VE (mean + 62%; P less than 0.01)by increasing f (mean + 180%; P less than 0.01), despite a decrease in VT (mean - 42%; P less than 0.01). RL increased (mean + 170%; P less than 0.001) and CLdyn decreased (mean - 43%; P less than 0.005). With the vagi cool, inhaled antigen no longer affected VE, f, or VT (P greater than 0.5), although RL still increased and CLdyn still decreased. Inhalation of a bronchodilator, terbutaline, prevented the broncho-constriction induced by antigen but did not prevent the ventilatory response. We conclude that vagal afferent pathways mediate the ventilatory response to inhaled antigen and suggest that the primary stimulus for this response is not airway narrowing. | Rapid, shallow breathing after Ascaris suum antigen inhalation: role of vagus nerves. In five treadmill-exercising, unsedated dogs, we studied the effect of inhaled Ascaris suum antigen aerosols on minute volume of ventilation (VE), respiratory frequency (f), tidal volume (VT), total pulmonary resistance (RL), and dynamic pulmonary compliance (CLdyn), before and during cooling of the vagus nerves. With the vagi warm, inhaled antigen increased VE (mean + 62%; P less than 0.01)by increasing f (mean + 180%; P less than 0.01), despite a decrease in VT (mean - 42%; P less than 0.01). RL increased (mean + 170%; P less than 0.001) and CLdyn decreased (mean - 43%; P less than 0.005). With the vagi cool, inhaled antigen no longer affected VE, f, or VT (P greater than 0.5), although RL still increased and CLdyn still decreased. Inhalation of a bronchodilator, terbutaline, prevented the broncho-constriction induced by antigen but did not prevent the ventilatory response. We conclude that vagal afferent pathways mediate the ventilatory response to inhaled antigen and suggest that the primary stimulus for this response is not airway narrowing. | [
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PMID:13059 | pH effects on lactate and excess lactate in relation to O2 deficit in hypoxic dogs. | Both hypoxemia and alkalemia increase arterial lactate levels, but excess lactate (XL) may be better related to the true O2 deficit and less subject to the pH effect upon glycolysis. To test this idea, 50 anesthetized (30 ml/kg pentobarbital sodium) and paralyzed dogs in five groups were ventilated with low O2 mixtures. Arterial pH was altered by CO2, hyperventilation, and HCO3- so that the average pH of the five groups were 6.99, 7.21, 7.34, 7.53, and 7.54 (+ propranolol). Pyruvate and lactate levels rose at rates roughly corresponding to pH. In all animals, rise of lactate (deltaL), XL and net O2 deficit were linear with time and the slope accurately described the rate of rise. When the ratio of XL rate deltaL rate was plotted against pH, it increased toward unity as pH decreased to 6.9. The ratio of deltaL rate to true O2 deficit rate also showed a significant pH effect by increasing with pH. Ratio of XL rate to true O2 deficit rate, on the other hand, was independent of pH. XL may correct for red cell lactate production which is not affected by O2 supply but is influenced by pH. | pH effects on lactate and excess lactate in relation to O2 deficit in hypoxic dogs. Both hypoxemia and alkalemia increase arterial lactate levels, but excess lactate (XL) may be better related to the true O2 deficit and less subject to the pH effect upon glycolysis. To test this idea, 50 anesthetized (30 ml/kg pentobarbital sodium) and paralyzed dogs in five groups were ventilated with low O2 mixtures. Arterial pH was altered by CO2, hyperventilation, and HCO3- so that the average pH of the five groups were 6.99, 7.21, 7.34, 7.53, and 7.54 (+ propranolol). Pyruvate and lactate levels rose at rates roughly corresponding to pH. In all animals, rise of lactate (deltaL), XL and net O2 deficit were linear with time and the slope accurately described the rate of rise. When the ratio of XL rate deltaL rate was plotted against pH, it increased toward unity as pH decreased to 6.9. The ratio of deltaL rate to true O2 deficit rate also showed a significant pH effect by increasing with pH. Ratio of XL rate to true O2 deficit rate, on the other hand, was independent of pH. XL may correct for red cell lactate production which is not affected by O2 supply but is influenced by pH. | [
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|
PMID:13061 | Studies on cathepsins of rat liver lysosomes. III. Hydrolysis of peptides, and inactivation of angiotensin and bradykinin by cathepsin A. | Systematic analysis of the hydrolysis of benzyloxycarbonyl (Cbz)-dipeptides by cathepsin A [EC 3.4.12.1] purified from rat liver lysosomes showed that multiple forms of cathepsin A preferentially cleave peptide bonds with leucine, methionine, and phenylalanine. Cbz-Met-Met, -Met-Phe, -Phe-Met, and -Phe-Ala were hydrolyzed 6 to 8 times faster than the standard substrates, Cbz-Glu-Phe and Cbz-Glu-Tyr. The pH optima of the hydrolyses were 4.6 to 5.8. Hydrolysis of peptide bonds with glycine, isoleucine, and proline was very slow, but the rate depended on the nature of the adjacent amino acids. Proteins such as albumin, cytochrome c, gamma-globulin, hemoglobin, histone, myoglobin, and myosin were scarecely degraded. Peptide hormones, such as glucagon and adrenocorticotropic hormone (ACTH) were hydrolyzed markedly with optimum pH's of 4.5 and 4.6, respectively. Angiotensin I, II, bradykinin, Lys- and Met-Lysbradykinin (kallidin and Met-kallidin), and substance P were also hydrolyzed at appreciable rates. pH optima for these peptide hormones were 5.2 to 5.6. On the other hand, insulin and its A chain, luteinizing hormone-releasing hormone (LH-RH), oxytocin and vasopressin were cleaved slowly. In the hydrolyses of glucagon and other peptides, multiple forms of rat liver lysosomal cathepsin A again showed a carboxypeptidase nature, cleaving peptide bonds sequentially from the carboxyl terminal. Almost all of the amino acids were cleaved on prolonged incubation. Vaso-activites of angiotensin II and bradykinin were rapidly lost on hydrolysis by cathepsin A. Lysosomal cathepsin C [dipeptidylaminopeptidase I, EC 3.4.14.1] also activated angiotensin II, but did not inactive bradykinin. Cathepsin A, therefore, can be regarded as one of the lysosomal angiotensinases and kinases. No distinct differences were observed between the multiple forms of cathepsin A in these hydrolyses and inactivations of peptides. | Studies on cathepsins of rat liver lysosomes. III. Hydrolysis of peptides, and inactivation of angiotensin and bradykinin by cathepsin A. Systematic analysis of the hydrolysis of benzyloxycarbonyl (Cbz)-dipeptides by cathepsin A [EC 3.4.12.1] purified from rat liver lysosomes showed that multiple forms of cathepsin A preferentially cleave peptide bonds with leucine, methionine, and phenylalanine. Cbz-Met-Met, -Met-Phe, -Phe-Met, and -Phe-Ala were hydrolyzed 6 to 8 times faster than the standard substrates, Cbz-Glu-Phe and Cbz-Glu-Tyr. The pH optima of the hydrolyses were 4.6 to 5.8. Hydrolysis of peptide bonds with glycine, isoleucine, and proline was very slow, but the rate depended on the nature of the adjacent amino acids. Proteins such as albumin, cytochrome c, gamma-globulin, hemoglobin, histone, myoglobin, and myosin were scarecely degraded. Peptide hormones, such as glucagon and adrenocorticotropic hormone (ACTH) were hydrolyzed markedly with optimum pH's of 4.5 and 4.6, respectively. Angiotensin I, II, bradykinin, Lys- and Met-Lysbradykinin (kallidin and Met-kallidin), and substance P were also hydrolyzed at appreciable rates. pH optima for these peptide hormones were 5.2 to 5.6. On the other hand, insulin and its A chain, luteinizing hormone-releasing hormone (LH-RH), oxytocin and vasopressin were cleaved slowly. In the hydrolyses of glucagon and other peptides, multiple forms of rat liver lysosomal cathepsin A again showed a carboxypeptidase nature, cleaving peptide bonds sequentially from the carboxyl terminal. Almost all of the amino acids were cleaved on prolonged incubation. Vaso-activites of angiotensin II and bradykinin were rapidly lost on hydrolysis by cathepsin A. Lysosomal cathepsin C [dipeptidylaminopeptidase I, EC 3.4.14.1] also activated angiotensin II, but did not inactive bradykinin. Cathepsin A, therefore, can be regarded as one of the lysosomal angiotensinases and kinases. No distinct differences were observed between the multiple forms of cathepsin A in these hydrolyses and inactivations of peptides. | [
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|
PMID:13062 | Human adenosine deaminase. Purification and subunit structure. | Human erythrocyte adenosine deaminase has been purified approximately 800,000-fold to apparent homogeneity using antibody affinity chromatography. The enzyme was shown to be a single polypeptide chain with an estimated molecular weight of approximately 38,000. The three electrophoretic forms of erythrocyte adenosine deaminase purified simultaneously by this technique were indistinguishable by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions. Several properties of the highly purified adenosine deaminase including pH optimum, Km for substrate, Ki for product, Stokes radius, sedimentation coefficient, and apparent substrate specificity were identical with the properties observed with an impure preparation of the enzyme. | Human adenosine deaminase. Purification and subunit structure. Human erythrocyte adenosine deaminase has been purified approximately 800,000-fold to apparent homogeneity using antibody affinity chromatography. The enzyme was shown to be a single polypeptide chain with an estimated molecular weight of approximately 38,000. The three electrophoretic forms of erythrocyte adenosine deaminase purified simultaneously by this technique were indistinguishable by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions. Several properties of the highly purified adenosine deaminase including pH optimum, Km for substrate, Ki for product, Stokes radius, sedimentation coefficient, and apparent substrate specificity were identical with the properties observed with an impure preparation of the enzyme. | [
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|
PMID:13063 | The carbon monoxide-binding hemoprotein reducible by hydrogen peroxide in microsomal fractions of pea seeds. | There exist at least two kinds of CO-binding hemoproteins in microsomal fractions of germinating pea (Pisum sativum) seeds. One of them is cytochrome P-450 and the other is also a protoheme protein (judged from its pyridine hemochrome spectrum), which is not hitherto reported. The content of the new hemoprotein is much higher than that of cytochrome P-450 in the early stage of germination. During germination the former decreases and the latter increases. The new hemoprotein is not appreciably reduced by sodium dithionite alone within a few minutes, but, it is easily reduced by dithionite in the presence of methyl viologen and also by hydrogen peroxide when CO is present. The addition of hydrogen peroxide to pea microsomes in the absence of CO causes destruction of the hemoprotein and also decolorization of endogenous carotenoid. Destruction of these components is brought about by organic hydroperoxides independently of the presence of CO. In the presence of hydroxylamine, the addition of hydroperoxides to the microsomes results in the formation of an absorption spectrum similar to the spectra of ferrous-NO complexes of protoheme proteins. When N,N-dimethyl p-phenylenediamine is present, the reaction of pea microsomes with hydroperoxides gives a spectrum similar to that of the ferryl form of myoglobin. The reactions of the hemoprotein with hydroperoxides are inhibited by alpha,alpha'-dipyridyl and aniline, with which pea microsomes form binding spectra. The microsomes form a rather stable difference spectrum with hydroxylamine. However, the hemoprotein is destroyed when hydroxylamine is added to the microsomes in the reduced state. | The carbon monoxide-binding hemoprotein reducible by hydrogen peroxide in microsomal fractions of pea seeds. There exist at least two kinds of CO-binding hemoproteins in microsomal fractions of germinating pea (Pisum sativum) seeds. One of them is cytochrome P-450 and the other is also a protoheme protein (judged from its pyridine hemochrome spectrum), which is not hitherto reported. The content of the new hemoprotein is much higher than that of cytochrome P-450 in the early stage of germination. During germination the former decreases and the latter increases. The new hemoprotein is not appreciably reduced by sodium dithionite alone within a few minutes, but, it is easily reduced by dithionite in the presence of methyl viologen and also by hydrogen peroxide when CO is present. The addition of hydrogen peroxide to pea microsomes in the absence of CO causes destruction of the hemoprotein and also decolorization of endogenous carotenoid. Destruction of these components is brought about by organic hydroperoxides independently of the presence of CO. In the presence of hydroxylamine, the addition of hydroperoxides to the microsomes results in the formation of an absorption spectrum similar to the spectra of ferrous-NO complexes of protoheme proteins. When N,N-dimethyl p-phenylenediamine is present, the reaction of pea microsomes with hydroperoxides gives a spectrum similar to that of the ferryl form of myoglobin. The reactions of the hemoprotein with hydroperoxides are inhibited by alpha,alpha'-dipyridyl and aniline, with which pea microsomes form binding spectra. The microsomes form a rather stable difference spectrum with hydroxylamine. However, the hemoprotein is destroyed when hydroxylamine is added to the microsomes in the reduced state. | [
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|
PMID:13064 | Purification and properties of 3-keto-5-aminohexanoate cleavage enzyme from a lysine-fermenting Clostridium. | The lysine-fermenting Clostridium SB4 is shown to contain a new type of beta-keto acid-degrading enzyme that converts 3-keto-5-aminohexanoate and acetyl-CoA reversibly to L-3-aminobutyryl-CoA and acetoacetate. Following the development of a sensitive radiochemical assay the enzyme was purified 175-fold to about 90% homogeneity in 44% yield. The specific activity of the purified enzyme is 44 IU/mg of protein at 30 degrees. The equilibrium constant for the forward reaction was found to be 0.68 at 30 degrees and pH 7.0, corresponding to a deltaG0' of 0.23 kcal/mol. The enzyme is highly substrate-specific. Of several substrate analogs tested in the forward and back reactions only beta-alanyl-CoA and D-3-aminobutyryl-CoA are utilized about 130% and 1.7% as fast as L-3-aminobutyryl-CoA, respectively. The product formed from beta-alanyl-CoA and acetoacetate is a neutral beta-keto acid, presumably 3-keto-5-aminopentanoic acid; its borohydride reduction product was partially characterized as a hydroxy-amino acid by various chromatographic and ion exchange methods. The activity of the purified enzyme is increased about 5-fold by addition of 0.1 mM Co2+ and to a lesser extent by Mn2+. Activity is inhibited by orthophosphate, thiol reagents, and EDTA; however, exposure of the enzyme to the latter compound prior to addition of Co2+ increases activity, presumably by removing competing divalent cations. Tracer experiments have shown that carbon atoms 1 and 2 of acetoacetate are derived from carbon atoms 1 and 2 of 3-keto-5-aminohexanoate whereas carbon atoms 3 and 4 are derived from acetyl-CoA. The amino acid moiety of 3-aminobutyryl-CoA is derived from carbon atoms 3 to 6 of 3-keto-5-aminohexanoate. Since no evidence for covalent enzyme-substrate intermediates could be obtained by the study of four possible group exchange reactions, a concerted reaction between 3-keto-5-aminohexanoate and acetyl-CoA is considered. The enzyme has a molecular weight of about 97,000 and probably contains four identical subunits. The relatively high specific activity of the enzyme in extracts of Clostridium SB4 indicates it functions in the main pathway of lysine degradation. This relatively stable enzyme provides a convenient and specific method for the quantitative estimation of nanomolar amounts of L- and D-3-aminobutyryl-CoA and beta-alanyl-CoA. | Purification and properties of 3-keto-5-aminohexanoate cleavage enzyme from a lysine-fermenting Clostridium. The lysine-fermenting Clostridium SB4 is shown to contain a new type of beta-keto acid-degrading enzyme that converts 3-keto-5-aminohexanoate and acetyl-CoA reversibly to L-3-aminobutyryl-CoA and acetoacetate. Following the development of a sensitive radiochemical assay the enzyme was purified 175-fold to about 90% homogeneity in 44% yield. The specific activity of the purified enzyme is 44 IU/mg of protein at 30 degrees. The equilibrium constant for the forward reaction was found to be 0.68 at 30 degrees and pH 7.0, corresponding to a deltaG0' of 0.23 kcal/mol. The enzyme is highly substrate-specific. Of several substrate analogs tested in the forward and back reactions only beta-alanyl-CoA and D-3-aminobutyryl-CoA are utilized about 130% and 1.7% as fast as L-3-aminobutyryl-CoA, respectively. The product formed from beta-alanyl-CoA and acetoacetate is a neutral beta-keto acid, presumably 3-keto-5-aminopentanoic acid; its borohydride reduction product was partially characterized as a hydroxy-amino acid by various chromatographic and ion exchange methods. The activity of the purified enzyme is increased about 5-fold by addition of 0.1 mM Co2+ and to a lesser extent by Mn2+. Activity is inhibited by orthophosphate, thiol reagents, and EDTA; however, exposure of the enzyme to the latter compound prior to addition of Co2+ increases activity, presumably by removing competing divalent cations. Tracer experiments have shown that carbon atoms 1 and 2 of acetoacetate are derived from carbon atoms 1 and 2 of 3-keto-5-aminohexanoate whereas carbon atoms 3 and 4 are derived from acetyl-CoA. The amino acid moiety of 3-aminobutyryl-CoA is derived from carbon atoms 3 to 6 of 3-keto-5-aminohexanoate. Since no evidence for covalent enzyme-substrate intermediates could be obtained by the study of four possible group exchange reactions, a concerted reaction between 3-keto-5-aminohexanoate and acetyl-CoA is considered. The enzyme has a molecular weight of about 97,000 and probably contains four identical subunits. The relatively high specific activity of the enzyme in extracts of Clostridium SB4 indicates it functions in the main pathway of lysine degradation. This relatively stable enzyme provides a convenient and specific method for the quantitative estimation of nanomolar amounts of L- and D-3-aminobutyryl-CoA and beta-alanyl-CoA. | [
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PMID:13065 | Mannosyltransferase activity in calf pancreas microsomes. Formation of 14C-labeled lipid-linked oligosaccharides from GDP-D-[14C]mannose and pancreatic dolichyl beta-D-[14C]mannopyranosyl phosphate. | Calf pancreas microsomes incorporated radioactive D-mannose from GDP-D-[14C]mannose into lipid-bound oligosaccharides extracted with chloroform/methanol/water (10/10/2.5, v/v). Several products, which probably differed in the size of the oligosaccharide moiety, were labeled. These could be partially resolved by thin layer chromatography and DEAE-cellulose chromatography. The labeled lipid-bound oligosaccharides were retained on DEAE-cellulose more strongly than synthetic dolichyl alpha-D-[14C]mannopyranosyl phosphate. They were stable to mild alkali, but labile to acid and hot alkali. Acid treatment yielded a neutral 14C-labeled oligosaccharide fraction which was estimated by gel filtration to have a minimum of 8 monosaccharide residues. Hot alkali treatment yielded a mixture of neutral and acidic 14C-labeled oligosaccharides which could be transformed into neutral products by alkaline phosphatase. The D-[14C]mannose residues were alpha-linked at the nonreducing terminus of the oligosaccharides since they could be removed completely with alpha-mannosidase. Most of the D-[14C]mannose-labeled oligosaccharides were retained on concanavalin A Sepharose and eluted with methyl alpha-D-mannopyranoside. Pancreatic dolichyl beta-D-[14C]mannopyranosyl phosphate incubated with calf pancreas microsomes in the presence of sodium taurocholate was efficiently utilized as donor of alpha-D-mannosyl residues in lipid-bound oligosaccharides. The products formed from dolichyl beta-D-[14C]mannopyranosyl phosphate were identical with those formed from GDP-D-[14C]mannose, and evidence was obtained to show that the dolichyl beta-D-[14C]mannopyranosyl phosphate was serving as donor without prior conversion to GDP-D-[14C]mannose. Transfer of mannose from dolichyl beta-D-[14C]mannopyranosyl phosphate to lipid-bound oligosaccharides took place at a pH optimum of 7.3, whereas transfer to the precipitate containing glycoproteins was greatest at pH 6.0 in Tris/maleate buffer. The addition of divalent cation was not required, but low concentrations of EDTA were extremely inhibitory. The carbohydrate composition of the lipid-bound oligosaccharides of microsomal membranes was investigated by gas-liquid chromatography and by reduction with sodium borotritide. A heterogeneous mixture of oligosaccharides containing N-acetyl-D-glucosamine, D-mannose, and D-glucose varying in proportions from approximately 1/2.5/0.5 to 1/5/1.5 was obtained with glucosamine at the reducing end. Acid treatment of the lipid-bound oligosaccharide fraction yielded dolichyl pyrophosphate, suggesting that at least some of the oligosaccharides were linked to dolichol through a pyrophosphate group. | Mannosyltransferase activity in calf pancreas microsomes. Formation of 14C-labeled lipid-linked oligosaccharides from GDP-D-[14C]mannose and pancreatic dolichyl beta-D-[14C]mannopyranosyl phosphate. Calf pancreas microsomes incorporated radioactive D-mannose from GDP-D-[14C]mannose into lipid-bound oligosaccharides extracted with chloroform/methanol/water (10/10/2.5, v/v). Several products, which probably differed in the size of the oligosaccharide moiety, were labeled. These could be partially resolved by thin layer chromatography and DEAE-cellulose chromatography. The labeled lipid-bound oligosaccharides were retained on DEAE-cellulose more strongly than synthetic dolichyl alpha-D-[14C]mannopyranosyl phosphate. They were stable to mild alkali, but labile to acid and hot alkali. Acid treatment yielded a neutral 14C-labeled oligosaccharide fraction which was estimated by gel filtration to have a minimum of 8 monosaccharide residues. Hot alkali treatment yielded a mixture of neutral and acidic 14C-labeled oligosaccharides which could be transformed into neutral products by alkaline phosphatase. The D-[14C]mannose residues were alpha-linked at the nonreducing terminus of the oligosaccharides since they could be removed completely with alpha-mannosidase. Most of the D-[14C]mannose-labeled oligosaccharides were retained on concanavalin A Sepharose and eluted with methyl alpha-D-mannopyranoside. Pancreatic dolichyl beta-D-[14C]mannopyranosyl phosphate incubated with calf pancreas microsomes in the presence of sodium taurocholate was efficiently utilized as donor of alpha-D-mannosyl residues in lipid-bound oligosaccharides. The products formed from dolichyl beta-D-[14C]mannopyranosyl phosphate were identical with those formed from GDP-D-[14C]mannose, and evidence was obtained to show that the dolichyl beta-D-[14C]mannopyranosyl phosphate was serving as donor without prior conversion to GDP-D-[14C]mannose. Transfer of mannose from dolichyl beta-D-[14C]mannopyranosyl phosphate to lipid-bound oligosaccharides took place at a pH optimum of 7.3, whereas transfer to the precipitate containing glycoproteins was greatest at pH 6.0 in Tris/maleate buffer. The addition of divalent cation was not required, but low concentrations of EDTA were extremely inhibitory. The carbohydrate composition of the lipid-bound oligosaccharides of microsomal membranes was investigated by gas-liquid chromatography and by reduction with sodium borotritide. A heterogeneous mixture of oligosaccharides containing N-acetyl-D-glucosamine, D-mannose, and D-glucose varying in proportions from approximately 1/2.5/0.5 to 1/5/1.5 was obtained with glucosamine at the reducing end. Acid treatment of the lipid-bound oligosaccharide fraction yielded dolichyl pyrophosphate, suggesting that at least some of the oligosaccharides were linked to dolichol through a pyrophosphate group. | [
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|
PMID:13066 | Collagen cross-linking. Effect of D-penicillamine on cross-linking in vitro. | D-Pencillamine is believed to inhibit collagen cross-link biosynthesis by forming thiazolidine rings with lysyl-derived aldehydes that are intermediates in bifunctional cross-link synthesis. Recently, we showed that aldehyde biosynthesis catalyzed by lysyl oxidase occurs after the onset of fibril formation and that nascent aldehydes form Schiff-base cross-links rapidly in fibrils. This suggested that the accessibility of D-penicillamine to most aldehydes formed during cross-link synthesis might be limited. To study this, reconstituted chick bone collagen fibrils were incubated in vitro with highly purified lysyl oxidase and D-penicillamine. As reported in previous studies in vivo, allysine content increased and polyfunctional cross-link synthesis decreased with D-penicillamine. However, the concentration of bifunctional cross-links increased rather than decreased due to a 2-fold increase in N6:6'-dehydro-5,5'-dihydroxylysinonorleucine. Hydroxyallysine, an intermediate in formation of this Schiff base, decreased. A time study indicated that allysine levels increased primarily after the bulk of Schiff base synthesis. These results indicate that D-penicillamine does not inhibit bifunctional cross-link synthesis as previously suggested. Its principal effect is to block synthesis of polyfunctional cross-link products from Schiff base cross-link precursors and to cause accumulation of these precursors. This effect may be due to interference with the close molecular packing required for polyfunctional cross-link synthesis. These results also suggest a mechanism for the relative insensitivity of tissues such as bone with high hydroxylysine content to D-penicillamine. In this study, D-penicillamine caused selective accumulation of allysyl and not hydroxyallysyl residues. In bone as opposed to soft tissues, hydroxyallysyl residues are intermediates in synthesis of almost all cross-links. | Collagen cross-linking. Effect of D-penicillamine on cross-linking in vitro. D-Pencillamine is believed to inhibit collagen cross-link biosynthesis by forming thiazolidine rings with lysyl-derived aldehydes that are intermediates in bifunctional cross-link synthesis. Recently, we showed that aldehyde biosynthesis catalyzed by lysyl oxidase occurs after the onset of fibril formation and that nascent aldehydes form Schiff-base cross-links rapidly in fibrils. This suggested that the accessibility of D-penicillamine to most aldehydes formed during cross-link synthesis might be limited. To study this, reconstituted chick bone collagen fibrils were incubated in vitro with highly purified lysyl oxidase and D-penicillamine. As reported in previous studies in vivo, allysine content increased and polyfunctional cross-link synthesis decreased with D-penicillamine. However, the concentration of bifunctional cross-links increased rather than decreased due to a 2-fold increase in N6:6'-dehydro-5,5'-dihydroxylysinonorleucine. Hydroxyallysine, an intermediate in formation of this Schiff base, decreased. A time study indicated that allysine levels increased primarily after the bulk of Schiff base synthesis. These results indicate that D-penicillamine does not inhibit bifunctional cross-link synthesis as previously suggested. Its principal effect is to block synthesis of polyfunctional cross-link products from Schiff base cross-link precursors and to cause accumulation of these precursors. This effect may be due to interference with the close molecular packing required for polyfunctional cross-link synthesis. These results also suggest a mechanism for the relative insensitivity of tissues such as bone with high hydroxylysine content to D-penicillamine. In this study, D-penicillamine caused selective accumulation of allysyl and not hydroxyallysyl residues. In bone as opposed to soft tissues, hydroxyallysyl residues are intermediates in synthesis of almost all cross-links. | [
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PMID:13067 | Lectin purification on affinity columns containing reductively aminated disaccharides. | A method is described for isolating lectins in pure form and quantitative yield in a single step by affinity chromatography on aminoethyl polyacrylamide gels containing reductively aminated disaccharide residues. The affinity columns were prepared in two steps: (a) direct reductive amination of the disaccharide and aminoethyl gel with sodium cyanoborohydride in aqueous solution at pH 9; (b) N-acetylation of excess amino groups. Affinity columns prepared by reductive amination of lactose, melibiose, maltose, and di-N-acetylchitobiose were used to purify the following lectins: lactose, peanut, castor bean; melibiose, Bandeiraea simplicifolia; maltose, jack bean, common lentil; di-N-acetylchitobiose, wheat germ. These columns are extremely stable, have good flow rates, and high binding capacities. | Lectin purification on affinity columns containing reductively aminated disaccharides. A method is described for isolating lectins in pure form and quantitative yield in a single step by affinity chromatography on aminoethyl polyacrylamide gels containing reductively aminated disaccharide residues. The affinity columns were prepared in two steps: (a) direct reductive amination of the disaccharide and aminoethyl gel with sodium cyanoborohydride in aqueous solution at pH 9; (b) N-acetylation of excess amino groups. Affinity columns prepared by reductive amination of lactose, melibiose, maltose, and di-N-acetylchitobiose were used to purify the following lectins: lactose, peanut, castor bean; melibiose, Bandeiraea simplicifolia; maltose, jack bean, common lentil; di-N-acetylchitobiose, wheat germ. These columns are extremely stable, have good flow rates, and high binding capacities. | [
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|
PMID:13068 | pH-dependent conformational states of horse liver alcohol dehydrogenase. | The quenching of liver alcohol dehydrogenase protein fluorescence at alkaline pH indicates two conformational states of the enzyme with a pKa of 9.8+/-0.2, shifted to 10.6+/-0.2 in D2O. NAD+ and 2-p-toluidinonaphthalene-6-sulfonate, a fluorescent probe competitive with coenzyme, bind to the acid conformation of the enzyme. The pKa of the protein-fluorescence quenching curve is shifted toward 7.6 in the presence of NAD+, and the ternary complex formation with NAD+ and trifluoroethanol results in a pH-independent maximal quench. At pH (pD) 10.5, the rate constant for NAD+ binding was 2.6 times faster in D2O2 than in H2O due to the shift of the pKa. Based on these results, a scheme has been proposed in which the state of protonation of an enzyme functional group with a pKa of 9.8 controls the conformational state of the enzyme. NAD+ binds to the acid conformation and subsequently causes another conformational change resulting in the perturbation of the pKa to 7.6. Alcohol then binds to the unprotonated form of the functional group with a pKa of 7.6 in the binary enzyme-NAD+ complex and converts the enzyme to the alkaline conformation. Thus, at neutral pH liver alcohol dehydrogenase undergoes two conformational changes en route to the ternary complex in which hydride transfer occurs. | pH-dependent conformational states of horse liver alcohol dehydrogenase. The quenching of liver alcohol dehydrogenase protein fluorescence at alkaline pH indicates two conformational states of the enzyme with a pKa of 9.8+/-0.2, shifted to 10.6+/-0.2 in D2O. NAD+ and 2-p-toluidinonaphthalene-6-sulfonate, a fluorescent probe competitive with coenzyme, bind to the acid conformation of the enzyme. The pKa of the protein-fluorescence quenching curve is shifted toward 7.6 in the presence of NAD+, and the ternary complex formation with NAD+ and trifluoroethanol results in a pH-independent maximal quench. At pH (pD) 10.5, the rate constant for NAD+ binding was 2.6 times faster in D2O2 than in H2O due to the shift of the pKa. Based on these results, a scheme has been proposed in which the state of protonation of an enzyme functional group with a pKa of 9.8 controls the conformational state of the enzyme. NAD+ binds to the acid conformation and subsequently causes another conformational change resulting in the perturbation of the pKa to 7.6. Alcohol then binds to the unprotonated form of the functional group with a pKa of 7.6 in the binary enzyme-NAD+ complex and converts the enzyme to the alkaline conformation. Thus, at neutral pH liver alcohol dehydrogenase undergoes two conformational changes en route to the ternary complex in which hydride transfer occurs. | [
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|
PMID:13069 | NADPH-cytochrome P-450 reductase. Circular dichroism and physical studies. | NADPH-cytochrome P-450 reductase was purified from hepatic microsomes of phenobarbital and hydrocortisone-treated rats by detergent solubilization and column chromatography. This membrane protein contains 31 mol per cent hydrophobic amino acid residues, 6 half-cystine residues, and a single tryptophan residue as determined by amino acid analysis after mineral or organic acid hydrolysis. The free mobility of cytochrome P-450 reductase in sodium dodecyl sulfate was identical to that of several soluble proteins used as standards (i.e. ovalbumin, bovin serum albumin, erythrocuprein, beta-galactosidase). Molecular weight estimates from sedimentation equilibrium studies in the presence of guanidine hydrochloride (76,500) are consistent with those determined by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate at various per cent gel concentrations (79,000 to 80,000). Computer analysis of circular dichroism spectra of cytochrome P-450 reductase in the far ultraviolet region indicated the presence of 34 per cent alpha helical and 16 per cent beta structure. The amount of random structure was calculated to be 50 per cent. | NADPH-cytochrome P-450 reductase. Circular dichroism and physical studies. NADPH-cytochrome P-450 reductase was purified from hepatic microsomes of phenobarbital and hydrocortisone-treated rats by detergent solubilization and column chromatography. This membrane protein contains 31 mol per cent hydrophobic amino acid residues, 6 half-cystine residues, and a single tryptophan residue as determined by amino acid analysis after mineral or organic acid hydrolysis. The free mobility of cytochrome P-450 reductase in sodium dodecyl sulfate was identical to that of several soluble proteins used as standards (i.e. ovalbumin, bovin serum albumin, erythrocuprein, beta-galactosidase). Molecular weight estimates from sedimentation equilibrium studies in the presence of guanidine hydrochloride (76,500) are consistent with those determined by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate at various per cent gel concentrations (79,000 to 80,000). Computer analysis of circular dichroism spectra of cytochrome P-450 reductase in the far ultraviolet region indicated the presence of 34 per cent alpha helical and 16 per cent beta structure. The amount of random structure was calculated to be 50 per cent. | [
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PMID:13070 | Purification and properties of acetyl coenzyme A synthetase from bakers' yeast. | Acetyl-CoA synthetase, utilized in a coupled reaction system, has been shown to be applicable to the spectrophotometric determination of propionic and methylmalonic acids in biological fluids. The isolation of acetyl-CoA synthetase from yeast is simpler than the purification from mammalian sources. This study also presents some properties of the yeast enzyme and compares it to the more extensively studied enzyme isolated from ammmalian tissue. Isolation and purification yielded a preparation with a specific activity of 44 units/mg at 25 degrees. The purified acetyl-CoA synthetase was apparently homogeneous by sodium dodecyl sulfate-poly-acrylamide gel electrophoresis with an estimated subunit molecular weight of 78,000. Polyacrylamide gel electrophoresis in the presence of ATP revealed a single protein band which contained all of the enzyme activity. Analytical ultra-centrifuge studies indicated the presence of a single protein with a molecular wright of 151,000 and sedimentation velocity analysis revealed a single peak with a sedimentation coefficient of 8.65 So20,w. Similar to the enzyme from mammalian sources, yeast acetyl-CoA synthetase has a high degree of substrate specificity and is active only on acetate and propionate. In addition, the reaction mechanism, as demonstrated by initial velocity patterns obtained from substrate pairs, appeared to be identical to the enzyme from bovine heart. However, the apparent Michaelis constants for the substrates were significantly different from the mammalian enzyme. The yeast-derived enzyme also differed from the mammalian in terms of molecular weight, amino acid composition, pH optimum, effect of monovalent cations, and stability characteristics. Thus, yeast acetyl-CoA synthetase is more easily purified than the mammalian enzyme and provides an excellent preparation for the assay of propionic and methylmalonic acids. | Purification and properties of acetyl coenzyme A synthetase from bakers' yeast. Acetyl-CoA synthetase, utilized in a coupled reaction system, has been shown to be applicable to the spectrophotometric determination of propionic and methylmalonic acids in biological fluids. The isolation of acetyl-CoA synthetase from yeast is simpler than the purification from mammalian sources. This study also presents some properties of the yeast enzyme and compares it to the more extensively studied enzyme isolated from ammmalian tissue. Isolation and purification yielded a preparation with a specific activity of 44 units/mg at 25 degrees. The purified acetyl-CoA synthetase was apparently homogeneous by sodium dodecyl sulfate-poly-acrylamide gel electrophoresis with an estimated subunit molecular weight of 78,000. Polyacrylamide gel electrophoresis in the presence of ATP revealed a single protein band which contained all of the enzyme activity. Analytical ultra-centrifuge studies indicated the presence of a single protein with a molecular wright of 151,000 and sedimentation velocity analysis revealed a single peak with a sedimentation coefficient of 8.65 So20,w. Similar to the enzyme from mammalian sources, yeast acetyl-CoA synthetase has a high degree of substrate specificity and is active only on acetate and propionate. In addition, the reaction mechanism, as demonstrated by initial velocity patterns obtained from substrate pairs, appeared to be identical to the enzyme from bovine heart. However, the apparent Michaelis constants for the substrates were significantly different from the mammalian enzyme. The yeast-derived enzyme also differed from the mammalian in terms of molecular weight, amino acid composition, pH optimum, effect of monovalent cations, and stability characteristics. Thus, yeast acetyl-CoA synthetase is more easily purified than the mammalian enzyme and provides an excellent preparation for the assay of propionic and methylmalonic acids. | [
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|
PMID:13071 | Purification and properties of a heat-stable glucocerebrosidase activating factor from control and Gaucher spleen. | Gaucher's disease is a lysosomal storage disease caused by a deficiency in the enzyme glucocerebrosidase. A small, heat-stable glycoprotein first obtained from Gaucher spleen (Ho, M. W., and O'Brien, J. S. (1971) Proc. Natl. Acad. Sci. U. S.A. 68, 2810-2813) has been observed to stimulate the activity of glucocerebrosidase isolated from normal tissue. It has been suggested that this material might be important in the physiological catabolism of glucocerebroside in normal individuals (Ho, M. W. (1974) in Enzyme Therapy in Lysosomal Storage Diseases (Tager, J. M., Hooghwinkel, G. J. M., and Daems, W. Th., eds) pp.239-246, North-Holland Publishing Co., Amsterdam). In order to investigate this suggestion, glucocerebrosidase activating factors were isolated and purified from control and Gaucher spleen and characterized. Although approximately the same mass of activator was isolated from both spleens, the two activators differ from one another in a number of important respects: (a) the activator from the control spleen is only 6 per cent as active (on a protein basis) as the activator from Gaucher spleen; (b) the amino acid compositions of the purified activators are significantly different; and (c) carbohydrate analysis of the purified activators indicates that the activator from Gaucher spleen is a glycoprotein, while that from control spleen is not. Comparative kinetic studies demonstrate that the anionic detergent, sodium taurocholate, and the acidic phospholipid, phosphatidylinositol, both stimulate glucocerebrosidase activity to a larger extent than the activator substance from Gaucher spleen. The activator from Gaucher spleen and human liver glucocerebrosidase both appear to contain significant hydrophobic character. We conclude that the activator is probably not physiologically important in the catabolism of glucocerebroside in normal tissues. The significance of the occurrence of this apparently unique glycoprotein activator in Gaucher spleen remains obscure; however, its presence represents another interesting aspect of Gaucher's disease that warrants further investigation. | Purification and properties of a heat-stable glucocerebrosidase activating factor from control and Gaucher spleen. Gaucher's disease is a lysosomal storage disease caused by a deficiency in the enzyme glucocerebrosidase. A small, heat-stable glycoprotein first obtained from Gaucher spleen (Ho, M. W., and O'Brien, J. S. (1971) Proc. Natl. Acad. Sci. U. S.A. 68, 2810-2813) has been observed to stimulate the activity of glucocerebrosidase isolated from normal tissue. It has been suggested that this material might be important in the physiological catabolism of glucocerebroside in normal individuals (Ho, M. W. (1974) in Enzyme Therapy in Lysosomal Storage Diseases (Tager, J. M., Hooghwinkel, G. J. M., and Daems, W. Th., eds) pp.239-246, North-Holland Publishing Co., Amsterdam). In order to investigate this suggestion, glucocerebrosidase activating factors were isolated and purified from control and Gaucher spleen and characterized. Although approximately the same mass of activator was isolated from both spleens, the two activators differ from one another in a number of important respects: (a) the activator from the control spleen is only 6 per cent as active (on a protein basis) as the activator from Gaucher spleen; (b) the amino acid compositions of the purified activators are significantly different; and (c) carbohydrate analysis of the purified activators indicates that the activator from Gaucher spleen is a glycoprotein, while that from control spleen is not. Comparative kinetic studies demonstrate that the anionic detergent, sodium taurocholate, and the acidic phospholipid, phosphatidylinositol, both stimulate glucocerebrosidase activity to a larger extent than the activator substance from Gaucher spleen. The activator from Gaucher spleen and human liver glucocerebrosidase both appear to contain significant hydrophobic character. We conclude that the activator is probably not physiologically important in the catabolism of glucocerebroside in normal tissues. The significance of the occurrence of this apparently unique glycoprotein activator in Gaucher spleen remains obscure; however, its presence represents another interesting aspect of Gaucher's disease that warrants further investigation. | [
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PMID:13072 | Multiple low spin forms of the cytochrome c ferrihemochrome. EPR spectra of various eukaryotic and prokaryotic cytochromes c. | 1. Despite the same methionine-sulfur:heme-iron:imidazole-nitrogen hemochrome structure observed by x-ray crystallography in four of the seven c-type eukaryotic and prokaryotic cytochromes examined, and the occurrence of the characteristic 695 nm absorption band correlated with the presence of a methionine-sulfur:heme-iron axial ligand in all seven proteins, they fall into two distinct classes on the basis of their EPR and optical spectra. The horse, tuna, and bakers' yeast iso-1 cytochromes c have a predominant neutral pH EPR form with g1=3.06, g2=2.26, and g3=1.25, while the bakers' yeast iso-2 and Euglena cytochromes c, the Rhodospirillum rubrum cytochrome c2, and the Paracoccus denitrificans cytochrome c550 all have a predominant neutral pH EPR form with g1=3.2, g2=2.05, and g3=1.39. The ferricytochromes with g1=3.06 have a B-Q splitting that is approximately 150 cm-1 larger than the ferricytochromes with g1=3.2. 2. Each of the cytochromes displays up to four low spin EPR forms that are in pH-dependent equilibrium and can all be observed at near neutral pH. As the pH is raised the predominant neutral pH form is converted into two forms with g1=3.4 and g1=3.6, identified by comparsion with model compounds and other heme proteins as epsilon-amino:heme-iron:imidazole and bis-epsilon-amino:heme-iron ferrihemochromes, respectively. 3. The pK for the conversion of the predominant neutral pH EPR form into the alkaline pH forms is the same as the pK for the disappearance of the 695 nm absorption band for the cytochromes, even though these pK values range over 2 pH units. This confirms that the g1=3.06 and g1=3.2 forms contain the methionine-sulfur:heme-iron axial ligand while the g1=3.4 and the g1=3.6 forms do not. 4. At extremes of pH, the horse and bakers' yeast iso-1 proteins display several high and low spin forms that are identified, showing that a variety of protein-derived ligands will coordinate to the heme iron including methionine and cysteine sulfur, histidine imidazole, and lysine epsilon-amine. 5. The spectrum of horse cytochrome c with added azide, cyanide, hydroxide, or imidazole as axial ligands has also been examined. 6. From a comparison of the EPR and optical spectral characteristics of these groups of cytochromes with model compounds, it is suggested that the difference between them is due to a change in the hydrogen bonding or perhaps even in the protonation of N-1 of the heme iron-bound histidine imidazole. | Multiple low spin forms of the cytochrome c ferrihemochrome. EPR spectra of various eukaryotic and prokaryotic cytochromes c. 1. Despite the same methionine-sulfur:heme-iron:imidazole-nitrogen hemochrome structure observed by x-ray crystallography in four of the seven c-type eukaryotic and prokaryotic cytochromes examined, and the occurrence of the characteristic 695 nm absorption band correlated with the presence of a methionine-sulfur:heme-iron axial ligand in all seven proteins, they fall into two distinct classes on the basis of their EPR and optical spectra. The horse, tuna, and bakers' yeast iso-1 cytochromes c have a predominant neutral pH EPR form with g1=3.06, g2=2.26, and g3=1.25, while the bakers' yeast iso-2 and Euglena cytochromes c, the Rhodospirillum rubrum cytochrome c2, and the Paracoccus denitrificans cytochrome c550 all have a predominant neutral pH EPR form with g1=3.2, g2=2.05, and g3=1.39. The ferricytochromes with g1=3.06 have a B-Q splitting that is approximately 150 cm-1 larger than the ferricytochromes with g1=3.2. 2. Each of the cytochromes displays up to four low spin EPR forms that are in pH-dependent equilibrium and can all be observed at near neutral pH. As the pH is raised the predominant neutral pH form is converted into two forms with g1=3.4 and g1=3.6, identified by comparsion with model compounds and other heme proteins as epsilon-amino:heme-iron:imidazole and bis-epsilon-amino:heme-iron ferrihemochromes, respectively. 3. The pK for the conversion of the predominant neutral pH EPR form into the alkaline pH forms is the same as the pK for the disappearance of the 695 nm absorption band for the cytochromes, even though these pK values range over 2 pH units. This confirms that the g1=3.06 and g1=3.2 forms contain the methionine-sulfur:heme-iron axial ligand while the g1=3.4 and the g1=3.6 forms do not. 4. At extremes of pH, the horse and bakers' yeast iso-1 proteins display several high and low spin forms that are identified, showing that a variety of protein-derived ligands will coordinate to the heme iron including methionine and cysteine sulfur, histidine imidazole, and lysine epsilon-amine. 5. The spectrum of horse cytochrome c with added azide, cyanide, hydroxide, or imidazole as axial ligands has also been examined. 6. From a comparison of the EPR and optical spectral characteristics of these groups of cytochromes with model compounds, it is suggested that the difference between them is due to a change in the hydrogen bonding or perhaps even in the protonation of N-1 of the heme iron-bound histidine imidazole. | [
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PMID:13073 | Activation of guanylate cyclase in cerebral cortex of rat by hydroxylamine. | Hydroxylamine actived guanylate cyclase in particulate fraction of cerebral cortex of rat. Activation was most remarkable in crude mitochondrial fraction. When the crude mitochondrial fraction was subjected to osmotic shock and fractionated, guanylate cyclase activity recovered in the subfractions as assayed with hydroxylamine was only one-third of the starting material. Recombination of the soluble and the particulate fractions, however, restored guanylate cyclase activity to the same level as that of the starting material. When varying quantities of the particulate and soluble fractions were combined, enzyme activity was proportional to the quantity of the soluble fraction. Heating of the soluble or particulate fraction at 55 degrees for 5 min inactivated guanylate cyclase. The heated particulate fraction markedly activated guanylate cyclase activity in the native soluble fraction, while the heated soluble fraction did not stimulate enzyme activity in the particulate. The particulate fraction preincubated with hydroxylamine at 37 degrees for 5 min followed by washing activated guanylate cyclase activity in the soluble fraction in the absence of hydroxylamine. Further fractionation of the crude mitochondrial fraction revealed that the factor(s) needed for the activation by hydroxylamine is associated with the mitochondria. The mitochondrial fraction of cerebral cortex activated guanylate cyclase in supernatant of brain, liver, or kidney in the presence of hydroxylamine. The mitochondrial fraction prepared from liver or kidney, in turn, activated soluble guanylate cyclase in brain. Activation of guanylate cyclase by hydroxylamine was compared with that of sodium azide. Azide activated guanylate cyclase in the synaptosomal soluble fraction, while hydroxylamine inhibited it. The particulate fraction preincubated with azide followed by washing did not stimulate guanylate cyclase activity in the absence of azide. The activation of guanylate cyclase by hydroxylamine is not due to a change in the concentration of the substrate GTP, Addition of hydroxylamine did not alter the apparent Km value of guanylate cyclase for GTP. Guanylate cyclase became less dependent on manganese in the presence of hydroxylamine. Thus the activation of guanylate cyclase by hydroxylamine is due to the change in the Vmax of the reaction. | Activation of guanylate cyclase in cerebral cortex of rat by hydroxylamine. Hydroxylamine actived guanylate cyclase in particulate fraction of cerebral cortex of rat. Activation was most remarkable in crude mitochondrial fraction. When the crude mitochondrial fraction was subjected to osmotic shock and fractionated, guanylate cyclase activity recovered in the subfractions as assayed with hydroxylamine was only one-third of the starting material. Recombination of the soluble and the particulate fractions, however, restored guanylate cyclase activity to the same level as that of the starting material. When varying quantities of the particulate and soluble fractions were combined, enzyme activity was proportional to the quantity of the soluble fraction. Heating of the soluble or particulate fraction at 55 degrees for 5 min inactivated guanylate cyclase. The heated particulate fraction markedly activated guanylate cyclase activity in the native soluble fraction, while the heated soluble fraction did not stimulate enzyme activity in the particulate. The particulate fraction preincubated with hydroxylamine at 37 degrees for 5 min followed by washing activated guanylate cyclase activity in the soluble fraction in the absence of hydroxylamine. Further fractionation of the crude mitochondrial fraction revealed that the factor(s) needed for the activation by hydroxylamine is associated with the mitochondria. The mitochondrial fraction of cerebral cortex activated guanylate cyclase in supernatant of brain, liver, or kidney in the presence of hydroxylamine. The mitochondrial fraction prepared from liver or kidney, in turn, activated soluble guanylate cyclase in brain. Activation of guanylate cyclase by hydroxylamine was compared with that of sodium azide. Azide activated guanylate cyclase in the synaptosomal soluble fraction, while hydroxylamine inhibited it. The particulate fraction preincubated with azide followed by washing did not stimulate guanylate cyclase activity in the absence of azide. The activation of guanylate cyclase by hydroxylamine is not due to a change in the concentration of the substrate GTP, Addition of hydroxylamine did not alter the apparent Km value of guanylate cyclase for GTP. Guanylate cyclase became less dependent on manganese in the presence of hydroxylamine. Thus the activation of guanylate cyclase by hydroxylamine is due to the change in the Vmax of the reaction. | [
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PMID:13074 | Studies on the cyclic 3':5'-AMP-stimulated pig liver protein kinase reaction with pyruvate kinase as substrate. | The phosphorylation of pig liver pyruvate kinase by cyclic adenosine 3':5'-monophosphate-dependent protein kinase has been studied. For comparison, mixed histone and a synthetic heptapeptide were also used as substrates. Protein kinase was purified by chromatography on DEAE-cellulose, hydroxyapatite, and Sephadex G-200. The enzyme was stimulated by cyclic AMP with apparent Ka values of 2.5 and 0.8 x 10-7 M for pyruvate kinase and histone substrates, respectively. Divalent cations were essential for the activity of the protein kinase. Variation of the concentration of ATP resulted in approximately straight lines in Lineweaver-Burk plots for the phosphorylation of both pyruvate kinase and mixed histone. The apparent Km values for ATP were 21 and 11 muM, respectively. The phosphorylation rate increased with the concentration of pyruvate kinase even at a concentration of 2 muM pyruvate kinase. At a high ionic strength, the phosphorylation rate of both pyruvate kinase and histone decreased. The phosphorylation rate varied markedly with pH in imidazole/HC1 and Tris/HC1 buffers. At slightly alkaline pH values, pyruvate kinase was phosphorylated at a much higher rate than pH7, but this was not the case for histone. At pH 8.5, the phosphorylation rate of pyruvate kinase was 3.5 times the rate at pH 7, while the corresponding increase for the histone phosphorylation was 50 per cent. In potassium phosphate buffers, the phosphorylation rate of both substrates did not change significantly over the pH range studied. Arrhenius' plots of the protein kinase reaction resulted in a break at about 10 degrees when pyruvate kinase was used as substrate, whereas a straight line was obtained when using histone. The negative allosteric effectors of pyruvate kinase, alanine, and phenylalanine, increased the phosphorylation rate of pyruvate kinase at pH 8 by 50 and 120 per cent, respectively. The same effectors did not influence the phosphorylation rate of mixed histone or a synthetic heptapeptide. It is concluded that the conformations adopted by pyruvate kinase in the presence of allosteric inhibitors make it a better substrate for the protein kinase. | Studies on the cyclic 3':5'-AMP-stimulated pig liver protein kinase reaction with pyruvate kinase as substrate. The phosphorylation of pig liver pyruvate kinase by cyclic adenosine 3':5'-monophosphate-dependent protein kinase has been studied. For comparison, mixed histone and a synthetic heptapeptide were also used as substrates. Protein kinase was purified by chromatography on DEAE-cellulose, hydroxyapatite, and Sephadex G-200. The enzyme was stimulated by cyclic AMP with apparent Ka values of 2.5 and 0.8 x 10-7 M for pyruvate kinase and histone substrates, respectively. Divalent cations were essential for the activity of the protein kinase. Variation of the concentration of ATP resulted in approximately straight lines in Lineweaver-Burk plots for the phosphorylation of both pyruvate kinase and mixed histone. The apparent Km values for ATP were 21 and 11 muM, respectively. The phosphorylation rate increased with the concentration of pyruvate kinase even at a concentration of 2 muM pyruvate kinase. At a high ionic strength, the phosphorylation rate of both pyruvate kinase and histone decreased. The phosphorylation rate varied markedly with pH in imidazole/HC1 and Tris/HC1 buffers. At slightly alkaline pH values, pyruvate kinase was phosphorylated at a much higher rate than pH7, but this was not the case for histone. At pH 8.5, the phosphorylation rate of pyruvate kinase was 3.5 times the rate at pH 7, while the corresponding increase for the histone phosphorylation was 50 per cent. In potassium phosphate buffers, the phosphorylation rate of both substrates did not change significantly over the pH range studied. Arrhenius' plots of the protein kinase reaction resulted in a break at about 10 degrees when pyruvate kinase was used as substrate, whereas a straight line was obtained when using histone. The negative allosteric effectors of pyruvate kinase, alanine, and phenylalanine, increased the phosphorylation rate of pyruvate kinase at pH 8 by 50 and 120 per cent, respectively. The same effectors did not influence the phosphorylation rate of mixed histone or a synthetic heptapeptide. It is concluded that the conformations adopted by pyruvate kinase in the presence of allosteric inhibitors make it a better substrate for the protein kinase. | [
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|
PMID:13075 | Assay and partial characterization of the solubilized cell surface receptor for immunoglobulin E. | The cell surface component (receptor) which specifically binds immunoglobulin E (IgE) presumably forms an integral part of the functional chain involved in the antigen-induced IgE-mediated degranulation of histamine-containing mast cells and basophils. This paper describes a simple (NH4)2SO4 predipitation assay with which the interaction of IgE with detergent-solubilized receptors can be reproducibly quantitated. Receptor saturation was demonstrated and a linear response to receptor concentration over at least a 30-fold rang obtained. By means of the assay it was shown that (a) all assayable receptors of rat basophil leukemia cells are cell surface expressed; (b) receptor specificity remains intact during solubilization; (c) the binding constants of the solubilized IgE receptors are similar to those determined on intact cells. Utilizing agarose gel filtration, preliminary estimates of the molecular weight of the active free solubilized receptor and of its complex with IgE suggest that the receptor is univalent. | Assay and partial characterization of the solubilized cell surface receptor for immunoglobulin E. The cell surface component (receptor) which specifically binds immunoglobulin E (IgE) presumably forms an integral part of the functional chain involved in the antigen-induced IgE-mediated degranulation of histamine-containing mast cells and basophils. This paper describes a simple (NH4)2SO4 predipitation assay with which the interaction of IgE with detergent-solubilized receptors can be reproducibly quantitated. Receptor saturation was demonstrated and a linear response to receptor concentration over at least a 30-fold rang obtained. By means of the assay it was shown that (a) all assayable receptors of rat basophil leukemia cells are cell surface expressed; (b) receptor specificity remains intact during solubilization; (c) the binding constants of the solubilized IgE receptors are similar to those determined on intact cells. Utilizing agarose gel filtration, preliminary estimates of the molecular weight of the active free solubilized receptor and of its complex with IgE suggest that the receptor is univalent. | [
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|
PMID:13076 | An energy-conserving pyruvate-to-acetate pathway in Entamoeba histolytica. Pyruvate synthase and a new acetate thiokinase. | Under anaerobic conditions, cells of Entamoeba histolytica grown with bacteria produce H2 and acetate while cells grown axenically produce neither. Aerobically, acetate is produced and O2 is consumed by amebae from either type of cells. Centrifuged extracts, 2.4 x 106 x g x min, from both types of cells contain pyruvate synthase (EC 1.2.7.1) and an acetate thiokinase which, together, form a system capable of converting pyruvate to acetate. Pyruvate synthase catalyzes the reaction: pyruvate + CoA leads to CO2 + acetyl-CoA + 2E. Electron acceptors which function with this enzyme are FAD, FMN, riboflavin, ferredoxin, and methyl viologen, but not NAD or NADP. The amebal acetate thiokinase catalyzes the reaction acetyl-CoA + ADP + Pi leads to acetate + ATP + CoA. For this apparently new enzyme we suggest the trivial name acetyl-CoA-synthetase (ADP-forming). Extracts from axenic amebae do not contain hydrogenase, but extracts from cells grown with bacteria do. It is postulated that in bacteria-grown amebae electrons generated at the pyruvate synthase step are utilized anaerobically to produce H2 via the hydrogenase and that the acetyl-CoA is converted to acetate in an energy-conserving step catalyzed by amebal acetyl-CoA synthetase. Aerobically, cells grown under either regimen may utilize the energy-conserving pyruvate-to-acetate pathway since O2 then serves as the ultimate electron acceptor. | An energy-conserving pyruvate-to-acetate pathway in Entamoeba histolytica. Pyruvate synthase and a new acetate thiokinase. Under anaerobic conditions, cells of Entamoeba histolytica grown with bacteria produce H2 and acetate while cells grown axenically produce neither. Aerobically, acetate is produced and O2 is consumed by amebae from either type of cells. Centrifuged extracts, 2.4 x 106 x g x min, from both types of cells contain pyruvate synthase (EC 1.2.7.1) and an acetate thiokinase which, together, form a system capable of converting pyruvate to acetate. Pyruvate synthase catalyzes the reaction: pyruvate + CoA leads to CO2 + acetyl-CoA + 2E. Electron acceptors which function with this enzyme are FAD, FMN, riboflavin, ferredoxin, and methyl viologen, but not NAD or NADP. The amebal acetate thiokinase catalyzes the reaction acetyl-CoA + ADP + Pi leads to acetate + ATP + CoA. For this apparently new enzyme we suggest the trivial name acetyl-CoA-synthetase (ADP-forming). Extracts from axenic amebae do not contain hydrogenase, but extracts from cells grown with bacteria do. It is postulated that in bacteria-grown amebae electrons generated at the pyruvate synthase step are utilized anaerobically to produce H2 via the hydrogenase and that the acetyl-CoA is converted to acetate in an energy-conserving step catalyzed by amebal acetyl-CoA synthetase. Aerobically, cells grown under either regimen may utilize the energy-conserving pyruvate-to-acetate pathway since O2 then serves as the ultimate electron acceptor. | [
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|
PMID:13077 | The purification and characterization of rat liver lysosomal alpha-L-fucosidase. | The alpha-L-fucosidase from rat liver lysosomes was purified approximately 27,000-fold (from cytoplasmic extract) by a rapid procedure requiring only 7 h anf providing enzyme in a 20 per cent yield. The procedure is based upon affinity chromatography with agarose-epsilon-aminocaproyl-fucosamine. The isolated enzyme was found to be pure by a number of different analytical gel techniques and is essentially free of other lysosomal gylcosidases. The purified enzyme exhibits a positive periodic acid-Schiff stain, suggesting that it is a glycoprotein. The purified enzyme has a pH optimum of 5.7 to 5.9, a Vmax of 27 mumol/min/mg of protein, and a Km of 0.19 mM with p-nitrophenyl alpha-L-fucopyranoside as substrate. L-Fucose was the only possibly physiological effector of the enzyme which was identified; it exhibited a Ki of 1.6 mM, with p-nitrophenyl alpha-L-fucopyranoside as substrate. The enzyme has a subunit molecular weight of approximately 55,000 by Na dodecyl-SO4 electrophoresis in a variety of gel systems. The molecular weight of the native enzyme was indicated to be approximately 160,000 by sucrose density centrifugation, 300,000 by molecular sieve chromatography on Sephadex G-200, and 217,000 by sedimentation equilibrium centrifugation. The weight of evidence suggests that the enzyme is a tetramer. Incubation on the absence of sulfhydryl reagents under appropriate conditions generates a second alpha-L-fucosidase activity band on gels corresponding to a molecular weight of approximately 40,000 to 50,000. This result suggests that the subunit is relatively stable and may reassociate to form active enzyme. Alpha-L-Fucosidase requires a high concentration of protein and the presence of a sulfhydryl reagent for stabilization. It is rapidly inactivated by p-chloromercuriphenyl sulfonic acid, this inactivation being rapidly reversible by the addition of 10 mM 2-mercaptoethanol. The enzyme catalyzed the hydrolysis of 1 leads to 2, 1 leads to 3, and 1 leads to 4 fucosyl linkages and was found to be active on glycopeptides but not on native glycoproteins. The amino acid and carbohydrate composition of the enzyme was determined. The native enzyme contains the following sugars (residues per tetramer): fucose (3.5), mannose (32), galactose (8), glucose (9), glucosamine (32), and sialic acid (8). Rat liver lysosomal alpha-glucosidase, also produced in the rapid isolation procedure described herein, contained less than 0.1 residue of sialic acid per subunit. | The purification and characterization of rat liver lysosomal alpha-L-fucosidase. The alpha-L-fucosidase from rat liver lysosomes was purified approximately 27,000-fold (from cytoplasmic extract) by a rapid procedure requiring only 7 h anf providing enzyme in a 20 per cent yield. The procedure is based upon affinity chromatography with agarose-epsilon-aminocaproyl-fucosamine. The isolated enzyme was found to be pure by a number of different analytical gel techniques and is essentially free of other lysosomal gylcosidases. The purified enzyme exhibits a positive periodic acid-Schiff stain, suggesting that it is a glycoprotein. The purified enzyme has a pH optimum of 5.7 to 5.9, a Vmax of 27 mumol/min/mg of protein, and a Km of 0.19 mM with p-nitrophenyl alpha-L-fucopyranoside as substrate. L-Fucose was the only possibly physiological effector of the enzyme which was identified; it exhibited a Ki of 1.6 mM, with p-nitrophenyl alpha-L-fucopyranoside as substrate. The enzyme has a subunit molecular weight of approximately 55,000 by Na dodecyl-SO4 electrophoresis in a variety of gel systems. The molecular weight of the native enzyme was indicated to be approximately 160,000 by sucrose density centrifugation, 300,000 by molecular sieve chromatography on Sephadex G-200, and 217,000 by sedimentation equilibrium centrifugation. The weight of evidence suggests that the enzyme is a tetramer. Incubation on the absence of sulfhydryl reagents under appropriate conditions generates a second alpha-L-fucosidase activity band on gels corresponding to a molecular weight of approximately 40,000 to 50,000. This result suggests that the subunit is relatively stable and may reassociate to form active enzyme. Alpha-L-Fucosidase requires a high concentration of protein and the presence of a sulfhydryl reagent for stabilization. It is rapidly inactivated by p-chloromercuriphenyl sulfonic acid, this inactivation being rapidly reversible by the addition of 10 mM 2-mercaptoethanol. The enzyme catalyzed the hydrolysis of 1 leads to 2, 1 leads to 3, and 1 leads to 4 fucosyl linkages and was found to be active on glycopeptides but not on native glycoproteins. The amino acid and carbohydrate composition of the enzyme was determined. The native enzyme contains the following sugars (residues per tetramer): fucose (3.5), mannose (32), galactose (8), glucose (9), glucosamine (32), and sialic acid (8). Rat liver lysosomal alpha-glucosidase, also produced in the rapid isolation procedure described herein, contained less than 0.1 residue of sialic acid per subunit. | [
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|
PMID:13078 | Investigation of the subunit interactions in malate dehydrogenase. | The dissociations of porcine heart mitochondrial, bovine heart mitochondrial, and porcine heart cytoplasmic malate dehydrogenase dimers (L-malate: NAD+oxidoreductase, EC 1.1.1.37) have been examined by Sephadex G-100 gel filtration chromatography and sedimentation velocity ultracentrifugation. The porcine mitochondrial enzyme was found to chromatograph as subunits when applied to a gel filtration column at a concentration of .02 muM or less at pH 7.0. The presence of coenzymes shifted the dissociation equilibrium at low enzyme concentrations in favor of dimer formation. Monomer formation was also favored when procine mitochondrial enzyme was incubated at pH 5.0 even at concentrations as high as 120 muM. This shift in equilibrium has been correlated with the increased rate and specificity of sulfhydryl residue modification with N-ethylmaleimide at pH 5.0 (Gregory, E.M., Yost, F.J.,Jr., Rohrbach, M.S., and Harrison, J.H. (1971)J. Biol. Chem. 246, 5491-5497). Bovine mitochondrial enzyme did not exhibit a concentration-dependent disociation under the conditions examined. However, at pH5.0 monomer formation was favored, and correlations could again be drawn with sulfhydryl residue modification (Gregory, E.M. (1975)J.Biol. Chem. 250, 5470-5474). In both mitochondrial enzymes, coenzyme binding was found capable of overcoming the effects of pH on the dissociation equilibrium, and dimer formation was favored. Unlike either of the above mentioned enzymes, porcine cytoplasmic malate dehydrogenase did not dissociate into its monomeric form under any conditions investigated. | Investigation of the subunit interactions in malate dehydrogenase. The dissociations of porcine heart mitochondrial, bovine heart mitochondrial, and porcine heart cytoplasmic malate dehydrogenase dimers (L-malate: NAD+oxidoreductase, EC 1.1.1.37) have been examined by Sephadex G-100 gel filtration chromatography and sedimentation velocity ultracentrifugation. The porcine mitochondrial enzyme was found to chromatograph as subunits when applied to a gel filtration column at a concentration of .02 muM or less at pH 7.0. The presence of coenzymes shifted the dissociation equilibrium at low enzyme concentrations in favor of dimer formation. Monomer formation was also favored when procine mitochondrial enzyme was incubated at pH 5.0 even at concentrations as high as 120 muM. This shift in equilibrium has been correlated with the increased rate and specificity of sulfhydryl residue modification with N-ethylmaleimide at pH 5.0 (Gregory, E.M., Yost, F.J.,Jr., Rohrbach, M.S., and Harrison, J.H. (1971)J. Biol. Chem. 246, 5491-5497). Bovine mitochondrial enzyme did not exhibit a concentration-dependent disociation under the conditions examined. However, at pH5.0 monomer formation was favored, and correlations could again be drawn with sulfhydryl residue modification (Gregory, E.M. (1975)J.Biol. Chem. 250, 5470-5474). In both mitochondrial enzymes, coenzyme binding was found capable of overcoming the effects of pH on the dissociation equilibrium, and dimer formation was favored. Unlike either of the above mentioned enzymes, porcine cytoplasmic malate dehydrogenase did not dissociate into its monomeric form under any conditions investigated. | [
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|
PMID:13079 | Tuna cytochrome c at 2.0 A resolution. I. Ferricytochrome structure analysis. | The crystal structure of oxidized cytochrome c from tuna hearts has been solved by x-ray diffraction to a resolution of 2.0 A, using four isomorphous heavy atom derivatives. The crystals, space group P43, have 2 independent cytochrome molecules in the asymmetric repeating unit. No significant difference is seen between these 2 molecules, aside from conformations of a few surface side chains. The molecular folding observed is essentially that reported for tuna ferrocytochrome c. In particular, the ring of phenylalanine 83 lies against the heme group and closes the heme crevice, and is not swung out into the surroundings as had been believed from the 2.8 A horse ferricytochrome c structure. | Tuna cytochrome c at 2.0 A resolution. I. Ferricytochrome structure analysis. The crystal structure of oxidized cytochrome c from tuna hearts has been solved by x-ray diffraction to a resolution of 2.0 A, using four isomorphous heavy atom derivatives. The crystals, space group P43, have 2 independent cytochrome molecules in the asymmetric repeating unit. No significant difference is seen between these 2 molecules, aside from conformations of a few surface side chains. The molecular folding observed is essentially that reported for tuna ferrocytochrome c. In particular, the ring of phenylalanine 83 lies against the heme group and closes the heme crevice, and is not swung out into the surroundings as had been believed from the 2.8 A horse ferricytochrome c structure. | [
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|
PMID:13081 | Some physicochemical properties of plasma membrane vesicles. | The plasma membranes of many animal cells can be disrupted into small sealed vesicles that can be purified centrifugally and utilized for studies on membrane transport. The vesicles behave as micro-osmometers. However, the presence of charges fixed at the internal and external surfaces of the membrane walls produce pH levels at these surfaces that deviate considerably from bulk pH. Transverse symmetry of charge distribution further leads to transverse asymmetry of surface pH. Finally, charges fixed at the internal membrane surface produced significant Donnan osmotic effects that depend upon membrane composition and ionic environment. | Some physicochemical properties of plasma membrane vesicles. The plasma membranes of many animal cells can be disrupted into small sealed vesicles that can be purified centrifugally and utilized for studies on membrane transport. The vesicles behave as micro-osmometers. However, the presence of charges fixed at the internal and external surfaces of the membrane walls produce pH levels at these surfaces that deviate considerably from bulk pH. Transverse symmetry of charge distribution further leads to transverse asymmetry of surface pH. Finally, charges fixed at the internal membrane surface produced significant Donnan osmotic effects that depend upon membrane composition and ionic environment. | [
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|
PMID:13082 | A novel mechanism for group translocation: substrate-product reutilization by gamma-glutamyl transpeptidase in peptide and amino acid transport. | Gamma-glutamyl transpeptidase (gamma-GTP) is suggested to act as a carrier in the group translocation of oligopeptides and possibly some amino acids across cellular membranes. It is proposed that the process may involve the repetitive transfer of gamma-glutamyl groups to acceptor peptides which are being translocated from the exterior of the cell to its interior. After group translocation of the peptides has occurred with concomitant formation of gamma-glutamyl peptide products, it is suggested that the products might then be utilized as substrate for the enzyme in order to permit the translocation of other peptides from the exterior. The system is economical and requires only that it be primed with an appropriate source of gamma-glutamyl peptides, such as glutathione. In contrast to most group translocation systems previously described, substrate-product reutilization by gamma-GTP would not be expected to accumulate peptides against a concentration gradient. Mechanisms for maintaining low intracellular concentrations of the translocated peptides are described. Studies on acceptor substrate specificity of gamma-GTP from bovine choroid plexus and rat kidney show some glycyl peptides are much better substrates than free amino acids in accord with the proposal that gamma-GTP might be primarily involved in peptide translocation. Both kinetic and topological evidence support the suggestion that repetitive transfer of gamma-glutamyl moieties by gamma-GTP could occur during group translocation of peptides and possibly some amino acids. | A novel mechanism for group translocation: substrate-product reutilization by gamma-glutamyl transpeptidase in peptide and amino acid transport. Gamma-glutamyl transpeptidase (gamma-GTP) is suggested to act as a carrier in the group translocation of oligopeptides and possibly some amino acids across cellular membranes. It is proposed that the process may involve the repetitive transfer of gamma-glutamyl groups to acceptor peptides which are being translocated from the exterior of the cell to its interior. After group translocation of the peptides has occurred with concomitant formation of gamma-glutamyl peptide products, it is suggested that the products might then be utilized as substrate for the enzyme in order to permit the translocation of other peptides from the exterior. The system is economical and requires only that it be primed with an appropriate source of gamma-glutamyl peptides, such as glutathione. In contrast to most group translocation systems previously described, substrate-product reutilization by gamma-GTP would not be expected to accumulate peptides against a concentration gradient. Mechanisms for maintaining low intracellular concentrations of the translocated peptides are described. Studies on acceptor substrate specificity of gamma-GTP from bovine choroid plexus and rat kidney show some glycyl peptides are much better substrates than free amino acids in accord with the proposal that gamma-GTP might be primarily involved in peptide translocation. Both kinetic and topological evidence support the suggestion that repetitive transfer of gamma-glutamyl moieties by gamma-GTP could occur during group translocation of peptides and possibly some amino acids. | [
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|
PMID:13084 | The separation of nonapeptides by reversed-phase high-performance liquid chromatography. | The separation properties of five nonapeptides on commercial reversed-phase materials have been investigated and the effects of pH, salt concentration and solvent composition have been studied. With appropriate variation of the pH and salt concentration in the mobile phase, it is possible to resolve all of the peptides investigated and their by-products. Mixtures of water and organic solvents (acetonitrile, dioxan, methanol and n-propanol) have been used. The choice of the organic solvent does not strongly influence the separation pattern. The simplicity, speed and quality of the separations and the favourable detection limits (ca. 30 ng) at 220 nm render this technique suitable to routine quantitative analysis. | The separation of nonapeptides by reversed-phase high-performance liquid chromatography. The separation properties of five nonapeptides on commercial reversed-phase materials have been investigated and the effects of pH, salt concentration and solvent composition have been studied. With appropriate variation of the pH and salt concentration in the mobile phase, it is possible to resolve all of the peptides investigated and their by-products. Mixtures of water and organic solvents (acetonitrile, dioxan, methanol and n-propanol) have been used. The choice of the organic solvent does not strongly influence the separation pattern. The simplicity, speed and quality of the separations and the favourable detection limits (ca. 30 ng) at 220 nm render this technique suitable to routine quantitative analysis. | [
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|
PMID:13085 | Effect of sulfonylureas on triglyceride metabolism in the rat liver: possible role of the lysosomes in hepatic lipolysis. | It has been suggested previously that chlorpropamide and other hypoglycemic sulfonylureas interfere with hepatic triglyceride breakdown. Since ketogenesis from endogenous hepatic lipid stores is a measure of hepatic triglyceride hydrolysis, ketogenesis derived from endogenous lipids as well as ketogenesis derived from exogenously added isotopic oleate was determined in isolated hepatocytes from fasted rats in an attempt to identify the nature of the direct effects of sulfonylureas on hepatic lipid metabolism. Ketogenesis from endogenous lipids was inhibited by 1 mM chlorpropamide, while ketone production from exogenous oleate did not change. The effect of chlorpropamide on hepatic triglyceride metabolism was further studied in the isolated perfused liver of normal rats in the presence of a continuous [3H]oleate infusion and in isolated liver cells incubated in the presence of [3H]oleate. In liver perfusion experiments, 1 mM chlorpropamide enhanced the incorporation of tritium into triglycerides (but not other lipid classes) and increased both liver triglyceride content and triglyceride secretion. Using isolated cells similar effects could be demonstrated at 0.5 mM chlorpropamide. Chlorpropamide, tolbutamide, and carbutamide, all of which inhibited endogenous ketogenesis in isolated liver cells, also inhibited lysosomal triglyceride lipase activity in rat liver homogenates. The drugs were not inhibitory towards alkaline lipase activity. Demethylglycodiazin (2-benzolsulfonamid--5-(beta-hydroxyethoxy)-pyrimidin), which did not inhibit endogenous ketogenesis in isolated liver cells, did not affect lysosomal lipase activity. The lysosomotropic drug chloroquine was markedly antiketogenic when tested in liver cells. The reduction in endogenous ketogenesis, the enhanced accumulation of liver triglycerides, and the stimulation of hepatic triglyceride output by chlorpropamide are ascribed to an interference of the drug with hepatic triglyceride breakdown. The present results also suggest that the lysosomes play a significant role in hepatic lipolysis. | Effect of sulfonylureas on triglyceride metabolism in the rat liver: possible role of the lysosomes in hepatic lipolysis. It has been suggested previously that chlorpropamide and other hypoglycemic sulfonylureas interfere with hepatic triglyceride breakdown. Since ketogenesis from endogenous hepatic lipid stores is a measure of hepatic triglyceride hydrolysis, ketogenesis derived from endogenous lipids as well as ketogenesis derived from exogenously added isotopic oleate was determined in isolated hepatocytes from fasted rats in an attempt to identify the nature of the direct effects of sulfonylureas on hepatic lipid metabolism. Ketogenesis from endogenous lipids was inhibited by 1 mM chlorpropamide, while ketone production from exogenous oleate did not change. The effect of chlorpropamide on hepatic triglyceride metabolism was further studied in the isolated perfused liver of normal rats in the presence of a continuous [3H]oleate infusion and in isolated liver cells incubated in the presence of [3H]oleate. In liver perfusion experiments, 1 mM chlorpropamide enhanced the incorporation of tritium into triglycerides (but not other lipid classes) and increased both liver triglyceride content and triglyceride secretion. Using isolated cells similar effects could be demonstrated at 0.5 mM chlorpropamide. Chlorpropamide, tolbutamide, and carbutamide, all of which inhibited endogenous ketogenesis in isolated liver cells, also inhibited lysosomal triglyceride lipase activity in rat liver homogenates. The drugs were not inhibitory towards alkaline lipase activity. Demethylglycodiazin (2-benzolsulfonamid--5-(beta-hydroxyethoxy)-pyrimidin), which did not inhibit endogenous ketogenesis in isolated liver cells, did not affect lysosomal lipase activity. The lysosomotropic drug chloroquine was markedly antiketogenic when tested in liver cells. The reduction in endogenous ketogenesis, the enhanced accumulation of liver triglycerides, and the stimulation of hepatic triglyceride output by chlorpropamide are ascribed to an interference of the drug with hepatic triglyceride breakdown. The present results also suggest that the lysosomes play a significant role in hepatic lipolysis. | [
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|
PMID:13086 | Ectopic beta-adrenergic receptor binding sites. possible molecular basis of aberrant catecholamine responsiveness of an adrenocortical tumor adenylate cyclase. | The molecular basis for the aberrant catecholamine responsiveness of the adenylate cyclase of adrenocortical carcinoma 494 was explored. The adenylate cyclase of this corticosteroid-producing, transplanted, adrenal cancer of the rat was stimulated not only by adrenocorticotropic hormone and fluoride, but also by the beta-adrenergic agonist, isoproterenol. The adenylate cyclase of normal adrenal tissue was unresponsive to isoproterenol. Direct binding studies with the specific high affinity B-adrenergic ligand, (-)[3H]dihydroalprenolol, demonstrated the pressure of 0.094 pmol of specific binding sites per milligram of tumor membrane protein. By contrast, normal adrenal membranes contained too few binding sites to accurately measure and study using these techniques. The tumor binding sites had high affinity for (-)[3H] dihydroalprenolol with an equilibrium dissociation constant of 2.1 nM. Adrenergic agonists competed for the binding sites in an order of potency, [(-) isoproterenol greater than (-) epinephrine (-) norepinephrine], paralleling their order of potency as beta-adrenergic agonists. The beta-adrenergic antagonist, (-) propranolol, competed for binding, causing half-mzximal inhibition of specific binding at a concentration of 6 nM. The alpha-adrenergic antagonist, phentolamine, and several catecholamine metabolites and precursors did not effectively compete for the binding sites at high concentrations. Binding was stereospecific, the (+) stereoisomers of beta-adrenergic agonists and antagonists requiring 40- to 300-fold higher concentrations than the corresponding (-) stereoisomers to half maximally inhibit (-) [3H] dihydroalprenolol binding. These results indicate that adrenocortical carcinoma 494 membranes contain beta-adrenergic receptor-binding sites which are not normally present in membranes of adrenal tissue. These ectopic beta-adrenergic receptors presumably confer on the neoplastic tissue the catecholamine sensitivity of its adenylate cyclase. | Ectopic beta-adrenergic receptor binding sites. possible molecular basis of aberrant catecholamine responsiveness of an adrenocortical tumor adenylate cyclase. The molecular basis for the aberrant catecholamine responsiveness of the adenylate cyclase of adrenocortical carcinoma 494 was explored. The adenylate cyclase of this corticosteroid-producing, transplanted, adrenal cancer of the rat was stimulated not only by adrenocorticotropic hormone and fluoride, but also by the beta-adrenergic agonist, isoproterenol. The adenylate cyclase of normal adrenal tissue was unresponsive to isoproterenol. Direct binding studies with the specific high affinity B-adrenergic ligand, (-)[3H]dihydroalprenolol, demonstrated the pressure of 0.094 pmol of specific binding sites per milligram of tumor membrane protein. By contrast, normal adrenal membranes contained too few binding sites to accurately measure and study using these techniques. The tumor binding sites had high affinity for (-)[3H] dihydroalprenolol with an equilibrium dissociation constant of 2.1 nM. Adrenergic agonists competed for the binding sites in an order of potency, [(-) isoproterenol greater than (-) epinephrine (-) norepinephrine], paralleling their order of potency as beta-adrenergic agonists. The beta-adrenergic antagonist, (-) propranolol, competed for binding, causing half-mzximal inhibition of specific binding at a concentration of 6 nM. The alpha-adrenergic antagonist, phentolamine, and several catecholamine metabolites and precursors did not effectively compete for the binding sites at high concentrations. Binding was stereospecific, the (+) stereoisomers of beta-adrenergic agonists and antagonists requiring 40- to 300-fold higher concentrations than the corresponding (-) stereoisomers to half maximally inhibit (-) [3H] dihydroalprenolol binding. These results indicate that adrenocortical carcinoma 494 membranes contain beta-adrenergic receptor-binding sites which are not normally present in membranes of adrenal tissue. These ectopic beta-adrenergic receptors presumably confer on the neoplastic tissue the catecholamine sensitivity of its adenylate cyclase. | [
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|
PMID:13087 | Patients' expectancies and hospital outcome. | Although it is widely held that patients' expectancies for therapeutic gain are related causally to treatment outcome, a recent review of expectancy research found scant evidence for the hypothesized expectancy-outcome relationship. Supportive findings were reported only in studies with serious methodological weaknesses. This study tested the relationship between the prognostic expectancies of hospitalized schizophrenic patients and several objective measures of hospital outcome. It also tested the hypothesis that expectancies may bear primarily a predictive, not causal, relationship to outcome. Multiple regression analyses found patients' expectancies to be correlated significantly with 8 of 15 measures of posthospital adjustment and with 14 of 15 measures of prehospital adjustment. The findings supported the expectancy-outcome relationship and also were consistent with a predictive interpretation of patients' expectancies. | Patients' expectancies and hospital outcome. Although it is widely held that patients' expectancies for therapeutic gain are related causally to treatment outcome, a recent review of expectancy research found scant evidence for the hypothesized expectancy-outcome relationship. Supportive findings were reported only in studies with serious methodological weaknesses. This study tested the relationship between the prognostic expectancies of hospitalized schizophrenic patients and several objective measures of hospital outcome. It also tested the hypothesis that expectancies may bear primarily a predictive, not causal, relationship to outcome. Multiple regression analyses found patients' expectancies to be correlated significantly with 8 of 15 measures of posthospital adjustment and with 14 of 15 measures of prehospital adjustment. The findings supported the expectancy-outcome relationship and also were consistent with a predictive interpretation of patients' expectancies. | [
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|
PMID:13088 | Alpha wave biofeedback training therapy in alcoholics. | This investigation evaluated the therapeutic efficacy of alpha-wave biofeedback treatment for alcoholics. Twenty-five Ss were compared to a matched control group before and after administration of a 3-week alpha-wave biofeedback regimen on a wide variety of criteria that included State-Trait Anxiety, the MMPI, Multiple Affect Adjective Check List, Zuckerman's Sensation Seeking Scale, Watson's Anhedonia Scale, the Brief Psychiatric Rating Scale, and baseline alpha. The experimental Ss received 10 hour-long alpha training sessions. The experimentals showed more improvement than did controls on alpha production and two anxiety measure. Contradictory results appeared on two suspicion/paranoia measures. Alpha training appeared useful in the treatment of anxiety, but not other problems. However, the absence of significant correlations between amount of change on alpha and the anxiety measures suggests that the improvement may be due to a placebo effect. | Alpha wave biofeedback training therapy in alcoholics. This investigation evaluated the therapeutic efficacy of alpha-wave biofeedback treatment for alcoholics. Twenty-five Ss were compared to a matched control group before and after administration of a 3-week alpha-wave biofeedback regimen on a wide variety of criteria that included State-Trait Anxiety, the MMPI, Multiple Affect Adjective Check List, Zuckerman's Sensation Seeking Scale, Watson's Anhedonia Scale, the Brief Psychiatric Rating Scale, and baseline alpha. The experimental Ss received 10 hour-long alpha training sessions. The experimentals showed more improvement than did controls on alpha production and two anxiety measure. Contradictory results appeared on two suspicion/paranoia measures. Alpha training appeared useful in the treatment of anxiety, but not other problems. However, the absence of significant correlations between amount of change on alpha and the anxiety measures suggests that the improvement may be due to a placebo effect. | [
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|
PMID:13089 | Steady-state bioavailability of two clorazepate dipotassium dosage forms. | A specially designed tablet dosage form of the benzodiazepine clorazepate dipotassium (Tranxene) was developed for once-a-day administration. The drug was administered at a dose of 22.5 mg as (1) the tablet, (2) three 7.5 mg capsules, or (3) one 7.5-mg capsule given every 6 hours. Peak serum levels from the tablet were intermediate between those of the single- and divided-dose capsule regimens. The desired decrease in magnitude of peak levels was obtained without affecting the extent of absorption. Pharmacokinetic analysis of the data according to a two-compartment open model with first-order absorption indicated that the serum half-life (t0.5beta) of nordiazepam, the major biotransformation product present in serum, was about 48 hours and served as a basis for the design of a multiple-dose steady-state study. Multiple-dose administration of the tablet and divided-capsule regimen to two groups of subjects for ten days indicated each dosage form yielded similar minimum steady-state serum levels of about 0.6 micrograms/ml which plateaued following seven days of drug administration. The dosage forms were crossed over between the groups on day 11 and administered for an additional four days. The minimum serum levels obtained with the tablet and capsule were not statistically different. Additionally, the peak serum level and area under the curve (pi=24 hours) at steady state were equivalent between the dosage forms. Good agreement was obtained between model-predicted and observed serum levels during multiple-dose administration for both the tablet and capsule regimens. The serum half-life of nordiazepam following 14 days of clorazepate dipotassium administration was similar to that found after a single dose. These results indicate that a single daily dose of drug as the tablet produced serum levels equivalent to a divided-capsule regimen. | Steady-state bioavailability of two clorazepate dipotassium dosage forms. A specially designed tablet dosage form of the benzodiazepine clorazepate dipotassium (Tranxene) was developed for once-a-day administration. The drug was administered at a dose of 22.5 mg as (1) the tablet, (2) three 7.5 mg capsules, or (3) one 7.5-mg capsule given every 6 hours. Peak serum levels from the tablet were intermediate between those of the single- and divided-dose capsule regimens. The desired decrease in magnitude of peak levels was obtained without affecting the extent of absorption. Pharmacokinetic analysis of the data according to a two-compartment open model with first-order absorption indicated that the serum half-life (t0.5beta) of nordiazepam, the major biotransformation product present in serum, was about 48 hours and served as a basis for the design of a multiple-dose steady-state study. Multiple-dose administration of the tablet and divided-capsule regimen to two groups of subjects for ten days indicated each dosage form yielded similar minimum steady-state serum levels of about 0.6 micrograms/ml which plateaued following seven days of drug administration. The dosage forms were crossed over between the groups on day 11 and administered for an additional four days. The minimum serum levels obtained with the tablet and capsule were not statistically different. Additionally, the peak serum level and area under the curve (pi=24 hours) at steady state were equivalent between the dosage forms. Good agreement was obtained between model-predicted and observed serum levels during multiple-dose administration for both the tablet and capsule regimens. The serum half-life of nordiazepam following 14 days of clorazepate dipotassium administration was similar to that found after a single dose. These results indicate that a single daily dose of drug as the tablet produced serum levels equivalent to a divided-capsule regimen. | [
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|
PMID:13090 | A double-blind evaluation of the nocturnal antisecretory effects of anisotropine methylbromide in man. Dose response and duration of action studies. | The effects of graded doses of anisotropine methylbromide on nocturanl gastric secretion were investigated in a double-blind crossover study in man. Single doses considerably higher than those usually employed for daytime use in adjunctive therapy of peptic ulcer disease significantly reduced acid secretion without significantly influencing heart rate, blood pressure, visual acuity, or visual accommodation. The duration of action of large doses was then evaluated in fasted and nonfasted subjects. A single dose reduced acid secretion for up to 8 hours, eliminating the nocturnal elevation of acid secretion characteristic of the normal circadian pattern. Near visual acuity and accommodation decreased, an effect more pronounced in fasted subjects, but the magnitude of visual impairment was small. These findings provide the basis for a controlled trial of high-dose nighttime therapy in peptic ulcer disease. | A double-blind evaluation of the nocturnal antisecretory effects of anisotropine methylbromide in man. Dose response and duration of action studies. The effects of graded doses of anisotropine methylbromide on nocturanl gastric secretion were investigated in a double-blind crossover study in man. Single doses considerably higher than those usually employed for daytime use in adjunctive therapy of peptic ulcer disease significantly reduced acid secretion without significantly influencing heart rate, blood pressure, visual acuity, or visual accommodation. The duration of action of large doses was then evaluated in fasted and nonfasted subjects. A single dose reduced acid secretion for up to 8 hours, eliminating the nocturnal elevation of acid secretion characteristic of the normal circadian pattern. Near visual acuity and accommodation decreased, an effect more pronounced in fasted subjects, but the magnitude of visual impairment was small. These findings provide the basis for a controlled trial of high-dose nighttime therapy in peptic ulcer disease. | [
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|
PMID:13093 | The use of behavior modification techniques to successfully manage the child dental patient. | Techniques of desensitization, modeling, and contingency management that can be used in the dental office for reducing anxiety and encouraging appropriate behavior in children are discussed. The "tell, show and do" approach is one desensitization technique easily applied in the private practice. Language should be at the child's level of understanding. An older sibling will frequently serve as an excellent model for a fearful child. Social reinforcers-a handshake, a smile, or praise-should be dispensed throughout dental treatment. Rewards should only follow desired behavior. | The use of behavior modification techniques to successfully manage the child dental patient. Techniques of desensitization, modeling, and contingency management that can be used in the dental office for reducing anxiety and encouraging appropriate behavior in children are discussed. The "tell, show and do" approach is one desensitization technique easily applied in the private practice. Language should be at the child's level of understanding. An older sibling will frequently serve as an excellent model for a fearful child. Social reinforcers-a handshake, a smile, or praise-should be dispensed throughout dental treatment. Rewards should only follow desired behavior. | [
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|
PMID:13094 | Bronchodilating activity of an H1 blocker, chlorpheniramine. | The purpose of this study was to test the hypothesis that chlorpheniramine (CP), and H1 blocker, can cause bronchodilatation if administered intravenously (iv) and in higher doses than those currently prescribed. In 10 subjects with allergic asthma, forced expiratory flows (FEF) were recorded on different days, at comparable baseline values, before and up to 5 hr after administration of 8 mg per os (po) chlorpheniramine, 10 mg iv CP (repeated twice), 5.5 mg/kg iv aminophylline, and 30 mg po butabarbital as well as during a day without drug. Chlorpheniramine administered intravenously produced reproducible increases (+ delta) in FEF, starting at 15 min, peaking at 120 min, and still persisting at 5 hr; the peak + delta averaged 15% for FEV1 and 27% to 53% for flows at low lung volume. FEF showed a comparable + delta after aminophylline, a smaller + delta after orally administered chlorpheniramine and no significant + delta during butabarbital or control sessions. The ratio change over time/variability was higher for FEV1, FEF50%, and FEF25%-75% than for the remaining parameters. In six subjects a double-blind study (chlorpheniramine vs. saline solution) confirmed the effectiveness of the doses administered in the open study. In three subjects, 10 mg iv chlorpheniramine was given at four different baseline values; the highest + delta occurred when the basal FEV1 was approximately 50% of the predicted value and the basal FEF at low lung volume 30% to 40% of the predicted value. In two subjects, log dose-response curves to 2.5, 5.0, and 10.0 mg iv chlorpheniramine were obtained by using FEV1, FEF50%, and FEF25%-75%. Thus chlorpheniramine in high iv doses can dilate the bronchi, the + delta FEF depending on the dose, the percent of the predicted basal FEF value, and "individual" responsiveness. Withing the dose range used, bronchodilatation to chlorpheniramine and aminophylline administered intravenously was best detected by FEV1, FEF50%, and FEF25%-75%. | Bronchodilating activity of an H1 blocker, chlorpheniramine. The purpose of this study was to test the hypothesis that chlorpheniramine (CP), and H1 blocker, can cause bronchodilatation if administered intravenously (iv) and in higher doses than those currently prescribed. In 10 subjects with allergic asthma, forced expiratory flows (FEF) were recorded on different days, at comparable baseline values, before and up to 5 hr after administration of 8 mg per os (po) chlorpheniramine, 10 mg iv CP (repeated twice), 5.5 mg/kg iv aminophylline, and 30 mg po butabarbital as well as during a day without drug. Chlorpheniramine administered intravenously produced reproducible increases (+ delta) in FEF, starting at 15 min, peaking at 120 min, and still persisting at 5 hr; the peak + delta averaged 15% for FEV1 and 27% to 53% for flows at low lung volume. FEF showed a comparable + delta after aminophylline, a smaller + delta after orally administered chlorpheniramine and no significant + delta during butabarbital or control sessions. The ratio change over time/variability was higher for FEV1, FEF50%, and FEF25%-75% than for the remaining parameters. In six subjects a double-blind study (chlorpheniramine vs. saline solution) confirmed the effectiveness of the doses administered in the open study. In three subjects, 10 mg iv chlorpheniramine was given at four different baseline values; the highest + delta occurred when the basal FEV1 was approximately 50% of the predicted value and the basal FEF at low lung volume 30% to 40% of the predicted value. In two subjects, log dose-response curves to 2.5, 5.0, and 10.0 mg iv chlorpheniramine were obtained by using FEV1, FEF50%, and FEF25%-75%. Thus chlorpheniramine in high iv doses can dilate the bronchi, the + delta FEF depending on the dose, the percent of the predicted basal FEF value, and "individual" responsiveness. Withing the dose range used, bronchodilatation to chlorpheniramine and aminophylline administered intravenously was best detected by FEV1, FEF50%, and FEF25%-75%. | [
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|
PMID:13122 | In situ localization of galactosyltransferase in surface mucous cells of the rat stomach. | Cryostate sections of the rat stomach fundus were incubated in the presence of uridine 5'-diphosphate-[3H]-galactose. The radioactivity in the surface mucous epithelial cells was shown by autoradiography to be specifically incorporated into a supranuclear area, the area where in these cells the Glogi system is situated. The incorporation lasted only 5-6 min and was Mn++ dependent. Galactose was probably incorporated into a beta-glycosidic bond. | In situ localization of galactosyltransferase in surface mucous cells of the rat stomach. Cryostate sections of the rat stomach fundus were incubated in the presence of uridine 5'-diphosphate-[3H]-galactose. The radioactivity in the surface mucous epithelial cells was shown by autoradiography to be specifically incorporated into a supranuclear area, the area where in these cells the Glogi system is situated. The incorporation lasted only 5-6 min and was Mn++ dependent. Galactose was probably incorporated into a beta-glycosidic bond. | [
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|
PMID:13123 | Neutralization kinetics studies with type SAT2 foot-and-mouth disease virus strains. 1. Factors that influence the rate and pattern of neutralization. | A study of the kinetics of inactivation of foot-and-mouth disease virus type SAT 2 strains revealed that in most cases the rate of neutralization was not rectilinear. Deviations from first-order kinetics observed represented biphasic or parabolic and stepwise reactions. The initial rate was rapid and showed no lag phase or shoulder. The effects of deviations from linearity could be minimized by dilution of antiserum to a suitable extent. Treatment of virus-antibody mixtures with anti-species globulin resulted in enhancement of the rate of neutralization of homologous and heterologous reactions without significantly altering the relation between the two. This treatment also considerably reduced the amount of the persistent fraction. In attempt to disaggregate virus it was observed that sodium dodecyl sulphate inhibited neutralization of virus by specific antiserum. | Neutralization kinetics studies with type SAT2 foot-and-mouth disease virus strains. 1. Factors that influence the rate and pattern of neutralization. A study of the kinetics of inactivation of foot-and-mouth disease virus type SAT 2 strains revealed that in most cases the rate of neutralization was not rectilinear. Deviations from first-order kinetics observed represented biphasic or parabolic and stepwise reactions. The initial rate was rapid and showed no lag phase or shoulder. The effects of deviations from linearity could be minimized by dilution of antiserum to a suitable extent. Treatment of virus-antibody mixtures with anti-species globulin resulted in enhancement of the rate of neutralization of homologous and heterologous reactions without significantly altering the relation between the two. This treatment also considerably reduced the amount of the persistent fraction. In attempt to disaggregate virus it was observed that sodium dodecyl sulphate inhibited neutralization of virus by specific antiserum. | [
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|
PMID:13124 | Interaction of erythrocytes with human serum proteins. I. Analysis of the effect of pH and ionic strength of the medium. | The effect of ionic parameters of the medium (pH and ionic strength) on the processes of interaction of tannin-treated erythrocytes and the protein fractions of human serum (macroglobulins, microglobulins and albumin) was studied in factorial experiments. Complex effect of these parametres on the processes under investigation and optimum conditions of erythrocyte sensitization were established. Subsequent fixation of antibodies by the erythrocyte diagnostic and their agglutinating activity are manifested in different mannera depending on the conditions of preceding sensitization. Important peculiarities were discovered in the mechanism of interaction between the erythrocytes and various serum proteins. The obtained results should be taken into account in the production of erythrocyte antigen and antibody diagnosticums. | Interaction of erythrocytes with human serum proteins. I. Analysis of the effect of pH and ionic strength of the medium. The effect of ionic parameters of the medium (pH and ionic strength) on the processes of interaction of tannin-treated erythrocytes and the protein fractions of human serum (macroglobulins, microglobulins and albumin) was studied in factorial experiments. Complex effect of these parametres on the processes under investigation and optimum conditions of erythrocyte sensitization were established. Subsequent fixation of antibodies by the erythrocyte diagnostic and their agglutinating activity are manifested in different mannera depending on the conditions of preceding sensitization. Important peculiarities were discovered in the mechanism of interaction between the erythrocytes and various serum proteins. The obtained results should be taken into account in the production of erythrocyte antigen and antibody diagnosticums. | [
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PMID:13125 | Immunofluorescence using dichlorotriazinylaminofluorescein (DTAF). I. Preparation and fractionation of labelled IgG. | Dichlorotriazinylaminofluorescein (DTAF), the product of the reaction of aminofluorescein with cyanuric chloride, is an effective reagent for conjugating fluorescein to immunnoglobulins. DTAF has absorption and emission properties nearly identical to fluoresceinisothiocyanate (FITC) and DTAF and FITC-labelled antibodies are similar in terms of preparation and specificity of immlnofluorescence. However, DTAF is superior to FITC with regard to cost, purity and stability. Also, DTAF-labelled rabbit IgG conjugates can by quickly and efficientyly fractionated by simple ammonium sulfate precipitation procedures to yield preparations free of both over- and under-conjugated material. In addition, over-conjugated protein can be readily removed from DTAF:IgG conjugates by appropriate adjustment of pH and temperature. | Immunofluorescence using dichlorotriazinylaminofluorescein (DTAF). I. Preparation and fractionation of labelled IgG. Dichlorotriazinylaminofluorescein (DTAF), the product of the reaction of aminofluorescein with cyanuric chloride, is an effective reagent for conjugating fluorescein to immunnoglobulins. DTAF has absorption and emission properties nearly identical to fluoresceinisothiocyanate (FITC) and DTAF and FITC-labelled antibodies are similar in terms of preparation and specificity of immlnofluorescence. However, DTAF is superior to FITC with regard to cost, purity and stability. Also, DTAF-labelled rabbit IgG conjugates can by quickly and efficientyly fractionated by simple ammonium sulfate precipitation procedures to yield preparations free of both over- and under-conjugated material. In addition, over-conjugated protein can be readily removed from DTAF:IgG conjugates by appropriate adjustment of pH and temperature. | [
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|
PMID:13126 | Isolation of anti-haemagglutinin antibodies with an influenza A virus immunoadsorbent. | The X-31 strain of influenza A (H3N2) virus has been covalently bound to CNBr activated agarose for the separation of anti-haemagglutinin antibodies. The virus immunoadsorbent was used repeatedly under high ionic strength alkali buffer and acid conditions without altering appreciably its antibody binding capacity. Sequential elution of bound anti-haemagglutinin antibodies with increasing concentrations of sodium iodide has enabled the physical separation of antibody populations with low and high avidity for the virus immunoadsorbent. In haemagglutination inhibition (h1) assays, the less avid population reacted only with the homologous X-31 virus, wheras the more avid antibody population reacted both with the homologous and the related cross-reactive A/England/42/72 (H3N2) strains. Sequential elution under acid conditions did not completely remove the bound anti-haemagglutinin antibodies and those eluted retained little of their anti-haemagglutinin activity. From a practical point of view, given a specific antiserum, it is feasible to use whole virus as an immunoadsorbent for the purpose of isolating populations of antibodies of different avidities and cross-reactivities. Furthermore, sodium iodide as an eluting agent has proved most effective in recovery of active and stable antibodies from the agarosebound virus. | Isolation of anti-haemagglutinin antibodies with an influenza A virus immunoadsorbent. The X-31 strain of influenza A (H3N2) virus has been covalently bound to CNBr activated agarose for the separation of anti-haemagglutinin antibodies. The virus immunoadsorbent was used repeatedly under high ionic strength alkali buffer and acid conditions without altering appreciably its antibody binding capacity. Sequential elution of bound anti-haemagglutinin antibodies with increasing concentrations of sodium iodide has enabled the physical separation of antibody populations with low and high avidity for the virus immunoadsorbent. In haemagglutination inhibition (h1) assays, the less avid population reacted only with the homologous X-31 virus, wheras the more avid antibody population reacted both with the homologous and the related cross-reactive A/England/42/72 (H3N2) strains. Sequential elution under acid conditions did not completely remove the bound anti-haemagglutinin antibodies and those eluted retained little of their anti-haemagglutinin activity. From a practical point of view, given a specific antiserum, it is feasible to use whole virus as an immunoadsorbent for the purpose of isolating populations of antibodies of different avidities and cross-reactivities. Furthermore, sodium iodide as an eluting agent has proved most effective in recovery of active and stable antibodies from the agarosebound virus. | [
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|
PMID:13127 | The use of early embryo aggregation derived chimaeras. I. To study immunological tolerance. | Early embryo aggregation mouse chimaeras have proven an invaluable tool to study mechanisms involved in tolerance. Such chimaeras are most commonly derived following the aggregation of two undifferentiated embryos and therefore not suprisingly they were originally considered examples of classic immunological tolerance. Since this time alternative mechanisms including humoral and cell suppressor activity have been suggested and until recently tolerance in tetraparental chimaeras has remained a controversy. This controversy is now reviewed in the light of recent findings which has suggested that such mice are in fact examples of classic tolerance with the possibility that this is achieved by heterogenous elimination of the clones of potentially self in equilibrium self auto-reactive cells. | The use of early embryo aggregation derived chimaeras. I. To study immunological tolerance. Early embryo aggregation mouse chimaeras have proven an invaluable tool to study mechanisms involved in tolerance. Such chimaeras are most commonly derived following the aggregation of two undifferentiated embryos and therefore not suprisingly they were originally considered examples of classic immunological tolerance. Since this time alternative mechanisms including humoral and cell suppressor activity have been suggested and until recently tolerance in tetraparental chimaeras has remained a controversy. This controversy is now reviewed in the light of recent findings which has suggested that such mice are in fact examples of classic tolerance with the possibility that this is achieved by heterogenous elimination of the clones of potentially self in equilibrium self auto-reactive cells. | [
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PMID:13129 | Effects of prolonged continuous exposure of human skin to water: a reassessment. | Continuous exposure of human skin to water in small plastic cups for periods of 72 and 144 hr produced a mild, transient dermatitis in half the sites tested. The degree of dermatitis was only slightly greater at 144 than at 72 hr, and was unrelated to the pH of the water samples. Comparison of soap-pretreated to non-pretreated skin areas showed a significant tendency for the more severe dermatitis to be present on the non-pretreated skin areas at higher pH's. There was virtually no coating of hairs with waxy yellowish material (clumps of bacteria), and no lesion was produced that resembled warm-water-immersion injuries. | Effects of prolonged continuous exposure of human skin to water: a reassessment. Continuous exposure of human skin to water in small plastic cups for periods of 72 and 144 hr produced a mild, transient dermatitis in half the sites tested. The degree of dermatitis was only slightly greater at 144 than at 72 hr, and was unrelated to the pH of the water samples. Comparison of soap-pretreated to non-pretreated skin areas showed a significant tendency for the more severe dermatitis to be present on the non-pretreated skin areas at higher pH's. There was virtually no coating of hairs with waxy yellowish material (clumps of bacteria), and no lesion was produced that resembled warm-water-immersion injuries. | [
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|
PMID:13131 | Simple assay for glycerophospholipid hydrolase activity of postheparin plasma. | An assay using radioactive substrates is described that permits rapid determinations of glycerophospholipid-hydrolyzing activity in postheparin plasma or its fractions. Optimal conditions are described for hydrolysis of phosphatidylcholine and phosphatidylethanolamine. A minimum of only 2 mul of normal postheparin plasma is used and no extraction of the reaction products is required before their separation by thin-layer chromatography. We found that after an optimal heparin dose of 60 units/kg body weight the rate of hydrolysis for diacyl glycerophosphocholine and diacyl glycerophosphoethanolamine is 1.16 mumoles/ml per hr and 22.4 mumoles/ml per hr, respectively. | Simple assay for glycerophospholipid hydrolase activity of postheparin plasma. An assay using radioactive substrates is described that permits rapid determinations of glycerophospholipid-hydrolyzing activity in postheparin plasma or its fractions. Optimal conditions are described for hydrolysis of phosphatidylcholine and phosphatidylethanolamine. A minimum of only 2 mul of normal postheparin plasma is used and no extraction of the reaction products is required before their separation by thin-layer chromatography. We found that after an optimal heparin dose of 60 units/kg body weight the rate of hydrolysis for diacyl glycerophosphocholine and diacyl glycerophosphoethanolamine is 1.16 mumoles/ml per hr and 22.4 mumoles/ml per hr, respectively. | [
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|
PMID:13132 | Assay for the terminal enzyme of the stearoyl coenzyme A desaturase system using chick embryo liver microsomes. | The NADH-dependent stearoyl CoA desaturase of hepatic microsomes (EC 1.14.99.5) is an enzyme system consisting of cytochrome b5 reductase (EC 1.6.2.2), cytochrome b5, and the terminal desaturase. We have developed a simple method for routine assay of the terminal enzyme based on complementation of the enzyme with chick embryo liver microsomes lacking desaturase activity. Desaturation of [1-14C]stearoyl CoA by the enzyme-microsome mixture is then assayed by thin-layer chromatography of the reaction products and determination of the amount of oleate formed. Microsomes from the livers of starved-refed rats were used as the source of the stearoyl CoA desaturase. The enzyme alone, solubilized and free from cytocrome b5 reductase and cytochrome b5, was unable to catalyze the desaturation of stearoyl CoA. However, after preincubation with chick embryo liver microsomes in the presence of 1% Triton X-100, the enzyme was active. The enzyme activity was linear with time and desaturase protein under the conditions described and depended on the concentrations of Triton X-100 present in the preincubation and the assay. The optimum concentrations of Triton X-100 were 1% for the preincubation and 0.1-0.15% in the assay. The desaturation activity was dependent on NADH and O2, and was inhibited 95% by 1 mM KCN. The use of chick embryo liver microsomes in this method eliminates the need to use purified cytochrome b5 reductase, cytochrome b5, and liposomes for routine assays and greatly reduces the complexities of timing and order of addition encountered in the existing assays. | Assay for the terminal enzyme of the stearoyl coenzyme A desaturase system using chick embryo liver microsomes. The NADH-dependent stearoyl CoA desaturase of hepatic microsomes (EC 1.14.99.5) is an enzyme system consisting of cytochrome b5 reductase (EC 1.6.2.2), cytochrome b5, and the terminal desaturase. We have developed a simple method for routine assay of the terminal enzyme based on complementation of the enzyme with chick embryo liver microsomes lacking desaturase activity. Desaturation of [1-14C]stearoyl CoA by the enzyme-microsome mixture is then assayed by thin-layer chromatography of the reaction products and determination of the amount of oleate formed. Microsomes from the livers of starved-refed rats were used as the source of the stearoyl CoA desaturase. The enzyme alone, solubilized and free from cytocrome b5 reductase and cytochrome b5, was unable to catalyze the desaturation of stearoyl CoA. However, after preincubation with chick embryo liver microsomes in the presence of 1% Triton X-100, the enzyme was active. The enzyme activity was linear with time and desaturase protein under the conditions described and depended on the concentrations of Triton X-100 present in the preincubation and the assay. The optimum concentrations of Triton X-100 were 1% for the preincubation and 0.1-0.15% in the assay. The desaturation activity was dependent on NADH and O2, and was inhibited 95% by 1 mM KCN. The use of chick embryo liver microsomes in this method eliminates the need to use purified cytochrome b5 reductase, cytochrome b5, and liposomes for routine assays and greatly reduces the complexities of timing and order of addition encountered in the existing assays. | [
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|
PMID:13133 | Alterations of prostaglandin E2-9-ketoreductase activity in proliferating skin. | The activity of an NADPH-dependent PGE2-9-ketoreductase has been demonstrated in rat and human skin. This activity is localized in the high speed supernatant fraction, indicating the presence of an active PGE2-9-ketoreductase associated with the cytoplasmic fraction of the skin. Transformation of PGE2 into PGF2alpha is enhanced by skin specimens from psoriatic plaques and EFA-deficient rats, both characterized by excessive cellular proliferation and increased NADPH production. Incubations of the 105,000 g supernatant fractions from normal and EFA-deficient rats demonstrated that the activity of the PGE2-9-ketoreductase was elevated in high speed preparations from EFA-deficient rats. Results from these studies suggest that the increased activity of PGE2-9-ketoreductase observed in skin from human psoriatic plaques and EFA-deficient rats may be due in part to the increased generation of NADPH by these tissues and in part to alteration of the PGE2-9-ketoreductase by the excessive proliferation of the tissues. | Alterations of prostaglandin E2-9-ketoreductase activity in proliferating skin. The activity of an NADPH-dependent PGE2-9-ketoreductase has been demonstrated in rat and human skin. This activity is localized in the high speed supernatant fraction, indicating the presence of an active PGE2-9-ketoreductase associated with the cytoplasmic fraction of the skin. Transformation of PGE2 into PGF2alpha is enhanced by skin specimens from psoriatic plaques and EFA-deficient rats, both characterized by excessive cellular proliferation and increased NADPH production. Incubations of the 105,000 g supernatant fractions from normal and EFA-deficient rats demonstrated that the activity of the PGE2-9-ketoreductase was elevated in high speed preparations from EFA-deficient rats. Results from these studies suggest that the increased activity of PGE2-9-ketoreductase observed in skin from human psoriatic plaques and EFA-deficient rats may be due in part to the increased generation of NADPH by these tissues and in part to alteration of the PGE2-9-ketoreductase by the excessive proliferation of the tissues. | [
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|
PMID:13134 | Cholic acid biosynthesis: conversion of 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol into 5beta-cholestane-3alpha,7alpha, 12alpha,24beta,25-pentol by human and rat liver microsomes. | This paper describes the conversion of 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol into 5beta-cholestane-3alpha,7alpha,12alpha,24beta,25-pentol by liver microsomes. A sensitive radioactive assay for measuring the formation of 5beta-cholestane-3alpha,7alpha,12alpha,24beta,25-pentol was developed. Optimal assay conditions for human and rat microsomal systems were established. A higher 24beta-hydroxylation activity was detected in rat than in human liver under the conditions employed. The hydroxylation of 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol by the rat liver microsomal fraction fortified with NADPH was stimulated about two-fold by administration of phenobarbital. Phenobarbital treatment also stimulated hydroxylations at C-23, C-24alpha, and C-26. Carbon monoxide markedly inhibited all side-chain hydroxylations. In contrast, side-chain hydroxylase activities were not affected in animals deprived of food for 48 hr. These results are consistent with a previously postulated cholic acid biosynthetic pathway involving 5beta-cholestane-3alpha,7alpha,12alpha,24beta,25-pentol as a key intermediate in man and in the rat. | Cholic acid biosynthesis: conversion of 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol into 5beta-cholestane-3alpha,7alpha, 12alpha,24beta,25-pentol by human and rat liver microsomes. This paper describes the conversion of 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol into 5beta-cholestane-3alpha,7alpha,12alpha,24beta,25-pentol by liver microsomes. A sensitive radioactive assay for measuring the formation of 5beta-cholestane-3alpha,7alpha,12alpha,24beta,25-pentol was developed. Optimal assay conditions for human and rat microsomal systems were established. A higher 24beta-hydroxylation activity was detected in rat than in human liver under the conditions employed. The hydroxylation of 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol by the rat liver microsomal fraction fortified with NADPH was stimulated about two-fold by administration of phenobarbital. Phenobarbital treatment also stimulated hydroxylations at C-23, C-24alpha, and C-26. Carbon monoxide markedly inhibited all side-chain hydroxylations. In contrast, side-chain hydroxylase activities were not affected in animals deprived of food for 48 hr. These results are consistent with a previously postulated cholic acid biosynthetic pathway involving 5beta-cholestane-3alpha,7alpha,12alpha,24beta,25-pentol as a key intermediate in man and in the rat. | [
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|
PMID:13135 | Analysis of rat serum apolipoproteins by isoelectric focusing. II. Studies on the low molecular weight subunits. | The low molecular weight proteins of rat apo HDL and apo VLDL have been isolated and analyzed by the technique of isoelectric focusing. Sephadex fractions from apo HDL (HS-3) and apo VLDL (VS-3) that contain these proteins reveal three major bands with apparent isoelectric points of pH 4.50, 4.67, and 4.74, as well as three minor bands at pH 4.43, 4.57, and 4.61. In addition, apo HDL has a major band at pI of 4.83. DEAE-Cellulose chromatography was used to prepare purified fractions of these components that were characterized by N-terminal analyses and molecular weight determinantions by SDS gel electrophoresis. The major low molecular weight components of apo HDL were focused on a slab gel and the bands were identified as A-II (pI 4.83), C-II (pI 4.74), C-III-0 (pI 4.67), and C-III-3 (pI 4.50). Neuraminidase treatment of apo HDL, followed by isoelectric focusing, suggested that the other bands, which have not previously been reported, may be additional forms of the C-III protein, differing only in their content of sialic acid. | Analysis of rat serum apolipoproteins by isoelectric focusing. II. Studies on the low molecular weight subunits. The low molecular weight proteins of rat apo HDL and apo VLDL have been isolated and analyzed by the technique of isoelectric focusing. Sephadex fractions from apo HDL (HS-3) and apo VLDL (VS-3) that contain these proteins reveal three major bands with apparent isoelectric points of pH 4.50, 4.67, and 4.74, as well as three minor bands at pH 4.43, 4.57, and 4.61. In addition, apo HDL has a major band at pI of 4.83. DEAE-Cellulose chromatography was used to prepare purified fractions of these components that were characterized by N-terminal analyses and molecular weight determinantions by SDS gel electrophoresis. The major low molecular weight components of apo HDL were focused on a slab gel and the bands were identified as A-II (pI 4.83), C-II (pI 4.74), C-III-0 (pI 4.67), and C-III-3 (pI 4.50). Neuraminidase treatment of apo HDL, followed by isoelectric focusing, suggested that the other bands, which have not previously been reported, may be additional forms of the C-III protein, differing only in their content of sialic acid. | [
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|
PMID:13136 | Lathyritic activity of isoniazid. | Although isoniazid is mainly known and used for its antituberculous properties, it is also a lathyrogenic agent. This paper presents data confirming the lathyritic activity of isoniazid in vitro and in vivo and suggests that its action on connective tissue may be partly responsible for its therapeutic effectiveness. | Lathyritic activity of isoniazid. Although isoniazid is mainly known and used for its antituberculous properties, it is also a lathyrogenic agent. This paper presents data confirming the lathyritic activity of isoniazid in vitro and in vivo and suggests that its action on connective tissue may be partly responsible for its therapeutic effectiveness. | [
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PMID:13137 | Human placental alcohol dehydrogenase. | Alcohol dehydrogenase derived from the term human placenta was investigated in the 104,000xg supernatant fraction. Kinetic experiments yielded an average Vmax of 6.1 units, a Km of 5X10(-3)M and optimum activity at pH 10.0. Electrophoresis at pH 9.6 in glycine buffer showed four bands, however only two bands were observed at pH 8.6. Properties of this placental enzyme may be unique and its participation in the overall metabolic function of this tissue is unclear. | Human placental alcohol dehydrogenase. Alcohol dehydrogenase derived from the term human placenta was investigated in the 104,000xg supernatant fraction. Kinetic experiments yielded an average Vmax of 6.1 units, a Km of 5X10(-3)M and optimum activity at pH 10.0. Electrophoresis at pH 9.6 in glycine buffer showed four bands, however only two bands were observed at pH 8.6. Properties of this placental enzyme may be unique and its participation in the overall metabolic function of this tissue is unclear. | [
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PMID:13138 | [Excretion of erythropoietin by humans during the production of alkaline or acidic urine (author's transl)]. | Marver & Gurney ((1968)Ann.N.Y.Acad.Sci. 149, 570-575) reported that the erythropoietin excretion in two anaemic patients increased 17 and 3.5-fold, respectively, during the production of alkaline urine by the administration of NaHCO3. We have studied the excretion of erythropoietin in 6 persons, following the daily administration of 3.5 g of NH4Cl, which resulted in an average urine pH of 5.9; and following the administration of hexapotassium hexasodium pentacitrate, which increased the urine pH TO 7.5. In the alkaline urine, erythropoietin excretion showed an average, but non-significant, two-fold increase. The increase was significant in only two experimental persons. | [Excretion of erythropoietin by humans during the production of alkaline or acidic urine (author's transl)]. Marver & Gurney ((1968)Ann.N.Y.Acad.Sci. 149, 570-575) reported that the erythropoietin excretion in two anaemic patients increased 17 and 3.5-fold, respectively, during the production of alkaline urine by the administration of NaHCO3. We have studied the excretion of erythropoietin in 6 persons, following the daily administration of 3.5 g of NH4Cl, which resulted in an average urine pH of 5.9; and following the administration of hexapotassium hexasodium pentacitrate, which increased the urine pH TO 7.5. In the alkaline urine, erythropoietin excretion showed an average, but non-significant, two-fold increase. The increase was significant in only two experimental persons. | [
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|
PMID:13139 | [Activation of acid prostate phosphatase by 1-pentanol (author's transl)]. | The activity of the acid phosphatase from prostate was increased by 90% by the addition of 150 mmol/l 1-pentanol to the assay mixture. This activation results in an increased turnover of substrate, so that the phosphomonoester is cleaved more rapidly and a correspondingly larger amount of the release organic residue can be detected. The quantity of free phosphate, however, does not correspond to the substrate turnover, because some of the phosphate residue is transferred from the substrate to the 1-pentanol in a transphosphorylation reaction. The influence of the substrate, buffer, pH and of tartrate on the 1-pentanol-activated prostate phosphatase was investigated. | [Activation of acid prostate phosphatase by 1-pentanol (author's transl)]. The activity of the acid phosphatase from prostate was increased by 90% by the addition of 150 mmol/l 1-pentanol to the assay mixture. This activation results in an increased turnover of substrate, so that the phosphomonoester is cleaved more rapidly and a correspondingly larger amount of the release organic residue can be detected. The quantity of free phosphate, however, does not correspond to the substrate turnover, because some of the phosphate residue is transferred from the substrate to the 1-pentanol in a transphosphorylation reaction. The influence of the substrate, buffer, pH and of tartrate on the 1-pentanol-activated prostate phosphatase was investigated. | [
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|
PMID:13140 | [The electrophoretic pattern of gamma-glutamyl transferase in serum and its alteration by chylomicrons (author's transl)]. | Using the sera from 20 patients with elevated gamma-glutamyl transferase activity (EC 2.3.2.2) due to intra- or posthepatic cholestasis, the enzyme was separated into four bands by cellulose acetate foil electrophoresis. The gamma-glutamyl transferase pattern permitted no differentiation between intra- or posthepatic cholestasis. Protein and lipid electrophoresis was performed simultaneously for each serum. It was found that a gamma-glutamyl transferase band, which appeared at the origin in 11 sera, was only observed in lipaemic sera containing chylomicrons. This band of gamma-glutamyl transferase does not, however, represent a true isoenzyme, because it results from a complex between chylomicrons and gamma-glutamyl transferase, which is separated with the chylomicrons, or is produced by the mixing of sera. | [The electrophoretic pattern of gamma-glutamyl transferase in serum and its alteration by chylomicrons (author's transl)]. Using the sera from 20 patients with elevated gamma-glutamyl transferase activity (EC 2.3.2.2) due to intra- or posthepatic cholestasis, the enzyme was separated into four bands by cellulose acetate foil electrophoresis. The gamma-glutamyl transferase pattern permitted no differentiation between intra- or posthepatic cholestasis. Protein and lipid electrophoresis was performed simultaneously for each serum. It was found that a gamma-glutamyl transferase band, which appeared at the origin in 11 sera, was only observed in lipaemic sera containing chylomicrons. This band of gamma-glutamyl transferase does not, however, represent a true isoenzyme, because it results from a complex between chylomicrons and gamma-glutamyl transferase, which is separated with the chylomicrons, or is produced by the mixing of sera. | [
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|
PMID:13142 | Rhodanese from Thiobacillus A2: catalysis of reactions of thiosulphate with dihydrolipoate and dihydrolipoamide. | Rhodanese (thiosulphate:cyanide sulphurtransferase EC.2.8.1.1) was purified 25- to 30-fold from thiosulphate-grown Thiobacillus A2. It exhibited a pH optimum between pH 10-2 and 10-4 and apparent Km values of 0-36 mM-Na2S2O3 and 17 mM-KCN. Ultraviolet spectrophotometry and thin-layer chromatography showed that the enzyme catalysed the reaction of S2O3(2-) with dihydrolipoic acid or dihydrolipoamide, producing alpha-lipoate or lipoamide, with the intermediate production of the persulphides of dihydrolipoate and dihydrolipoamide, which were demonstrated chromatographically. This is the first demonstration of catalysis by a thiobacillus rhodanese of reactions which are likely to be physiologically important in the oxidative dissimilation of thiosulphate by a central energy-conserving pathway. | Rhodanese from Thiobacillus A2: catalysis of reactions of thiosulphate with dihydrolipoate and dihydrolipoamide. Rhodanese (thiosulphate:cyanide sulphurtransferase EC.2.8.1.1) was purified 25- to 30-fold from thiosulphate-grown Thiobacillus A2. It exhibited a pH optimum between pH 10-2 and 10-4 and apparent Km values of 0-36 mM-Na2S2O3 and 17 mM-KCN. Ultraviolet spectrophotometry and thin-layer chromatography showed that the enzyme catalysed the reaction of S2O3(2-) with dihydrolipoic acid or dihydrolipoamide, producing alpha-lipoate or lipoamide, with the intermediate production of the persulphides of dihydrolipoate and dihydrolipoamide, which were demonstrated chromatographically. This is the first demonstration of catalysis by a thiobacillus rhodanese of reactions which are likely to be physiologically important in the oxidative dissimilation of thiosulphate by a central energy-conserving pathway. | [
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|
PMID:13144 | An alginate lysate from Azotobacter vinelandii phage. | The alginate depolymerase associated with bacteriophage infection of Azotobacter vinelandii has been used in the analysis of sodium alginate. The enzyme degraded the polysaccharide to a series of oligouronides each containing a terminal 4-deoxy-alpha-L-erythro-hex-4-enopyranuronosyl residue. Analysis of these oligouronides, together with kinetic information, indicated that the enzyme was specific for mannuronic acid-containing regions of the polyuronide. The specificity of the enzyme made it possible to determine the primary structure of the macro-molecule. The phage-induced enzyme was shown to be distinct from the alginate lyase elaborated by the host organisms by its pH optimum, molecular weight, Michaelis constant and stability. | An alginate lysate from Azotobacter vinelandii phage. The alginate depolymerase associated with bacteriophage infection of Azotobacter vinelandii has been used in the analysis of sodium alginate. The enzyme degraded the polysaccharide to a series of oligouronides each containing a terminal 4-deoxy-alpha-L-erythro-hex-4-enopyranuronosyl residue. Analysis of these oligouronides, together with kinetic information, indicated that the enzyme was specific for mannuronic acid-containing regions of the polyuronide. The specificity of the enzyme made it possible to determine the primary structure of the macro-molecule. The phage-induced enzyme was shown to be distinct from the alginate lyase elaborated by the host organisms by its pH optimum, molecular weight, Michaelis constant and stability. | [
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|
PMID:13143 | Regulation of the tricarboxylic acid cycle and poly-beta-hydroxybutyrate metabolism in Azotobacter beijerinckii grown under nitrogen or oxygen limitation. | Azotobacter beijerinckii was grown in ammonia-free glucose/mineral salts media in chemostat culture under oxygen or nitrogen limitation. Selected enzymes of the tricarboxylic acid cycle and poly-beta-hydroxybutyrate metabolism were monitored in relation to oxygen supply for both steady and transition states. Two dissolved oxygen concentrations were used for the nitrogen-limited steady state to investigate the possible effects of respiratory protection of nitrogenase on these enzymes. The levels of NADH oxidase, isocitrate dehydrogenase and 2-oxoglutarate dehydrogenase increased markedly on relaxation of oxygen limitation while pyruvate dehydrogenase and citrate synthase were relatively unaffected. beta-Ketothiolase and acetoacetyl-CoA reductase levels decreased as oxygen limitation was relaxed. Respiratory activity, as measured by the QO2 value, increased with oxygen supply rate. Imposition of oxygen limitation on a nitrogen-limited culture caused an immediate increase in the NADH/NAD ratio but this rapidly readjusted to its previous steady-state value. These changes are discussed in relation to respiratory protection of nitrogenase and poly-beta-hydroxybutyrate metabolism in A. beijerinckii. | Regulation of the tricarboxylic acid cycle and poly-beta-hydroxybutyrate metabolism in Azotobacter beijerinckii grown under nitrogen or oxygen limitation. Azotobacter beijerinckii was grown in ammonia-free glucose/mineral salts media in chemostat culture under oxygen or nitrogen limitation. Selected enzymes of the tricarboxylic acid cycle and poly-beta-hydroxybutyrate metabolism were monitored in relation to oxygen supply for both steady and transition states. Two dissolved oxygen concentrations were used for the nitrogen-limited steady state to investigate the possible effects of respiratory protection of nitrogenase on these enzymes. The levels of NADH oxidase, isocitrate dehydrogenase and 2-oxoglutarate dehydrogenase increased markedly on relaxation of oxygen limitation while pyruvate dehydrogenase and citrate synthase were relatively unaffected. beta-Ketothiolase and acetoacetyl-CoA reductase levels decreased as oxygen limitation was relaxed. Respiratory activity, as measured by the QO2 value, increased with oxygen supply rate. Imposition of oxygen limitation on a nitrogen-limited culture caused an immediate increase in the NADH/NAD ratio but this rapidly readjusted to its previous steady-state value. These changes are discussed in relation to respiratory protection of nitrogenase and poly-beta-hydroxybutyrate metabolism in A. beijerinckii. | [
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|
PMID:13147 | Growth of Spirillum lipoferum at constant partial pressures of oxygen, and the properties of its nitrogenase in cell-free extracts. | Spirillum lipoferum, an N2-fixing organism, was grown at constant concentrations of dissolved O2. When supplied with NH4+ aerobically, its doubling time was 1 h; when it fixed N2 microaerophilically, its doubling time was 5-5 to 7 h and the optimal PO2 for growth was 0-005 to 0-007 atm. At its optimal PO2 for growth on N2, S. lipoferum assimilated 8 to 10 mg nitrogen/g carbon substrate used; its efficiency was less at higher PO2 levels. Nitrogenase in cell-free extracts required Mg2+ and Mn2+, and the Fe-protein was activated by Rhodospirillum rubrum activating factor. The nitrogenase had an optimal pH of 7-1 to 7-4 and an apparent Km for acetylene of 0-0036 atm. Extracts of S. lipoferum lost their nitrogenase activity on storage at -18 degrees C, and activity was restored by adding purified Fe-protein from other N2-fixing bacteria. | Growth of Spirillum lipoferum at constant partial pressures of oxygen, and the properties of its nitrogenase in cell-free extracts. Spirillum lipoferum, an N2-fixing organism, was grown at constant concentrations of dissolved O2. When supplied with NH4+ aerobically, its doubling time was 1 h; when it fixed N2 microaerophilically, its doubling time was 5-5 to 7 h and the optimal PO2 for growth was 0-005 to 0-007 atm. At its optimal PO2 for growth on N2, S. lipoferum assimilated 8 to 10 mg nitrogen/g carbon substrate used; its efficiency was less at higher PO2 levels. Nitrogenase in cell-free extracts required Mg2+ and Mn2+, and the Fe-protein was activated by Rhodospirillum rubrum activating factor. The nitrogenase had an optimal pH of 7-1 to 7-4 and an apparent Km for acetylene of 0-0036 atm. Extracts of S. lipoferum lost their nitrogenase activity on storage at -18 degrees C, and activity was restored by adding purified Fe-protein from other N2-fixing bacteria. | [
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|
PMID:13148 | Adenylate energy charge during batch culture of Beneckea natriegens. | The value of the adenylate energy charge, i.e. ([ATP] + 1/2[ADP])/([ATP] + [ADP] + [AMP]), during batch culture of Beneckea natriegens remained relatively constant during the exponential and early stationary phases of the growth cycle. During exponential growth the intracellular ATP content remained constant, the amount of ATP in the culture increasing proportionally with growth; these conditions were unaltered during growth in the presence of added cyclic AMP. On cessation of growth, significant variation in bacterial ATP content was observed depending on whether growth of the cultures terminated due to exhaustion of carbon or nitrogen from the medium, and on the presence or absence of added cyclic AMP. | Adenylate energy charge during batch culture of Beneckea natriegens. The value of the adenylate energy charge, i.e. ([ATP] + 1/2[ADP])/([ATP] + [ADP] + [AMP]), during batch culture of Beneckea natriegens remained relatively constant during the exponential and early stationary phases of the growth cycle. During exponential growth the intracellular ATP content remained constant, the amount of ATP in the culture increasing proportionally with growth; these conditions were unaltered during growth in the presence of added cyclic AMP. On cessation of growth, significant variation in bacterial ATP content was observed depending on whether growth of the cultures terminated due to exhaustion of carbon or nitrogen from the medium, and on the presence or absence of added cyclic AMP. | [
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|
PMID:13149 | Agoraphobia: indications for the application of the multimodal behavioral conceptualization. | Agoraphobia, characterized as fear of going into public places, vehicles, shops, streets, and so forth, is a prevalent syndrome which permeates the patient's life. The efficacy of psychoanalytic, behavioral, and pharmacological treatments has been disappointing. The pervasive nature of agoraphobia dictates that its treatment is most efficacious when a combination of separate although interactive techniques is applied in concert. A multimodal behavioral conceptualization provides the vehicle for the systematic combined application of seemingly diverse individual approaches through monitoring and treating the BASIC ID, an acronym for behavior, affect, sensation, imagery, cognition, interpersonal relationships, and drugs. In an illustrative case, application of the multimodal behavioral conceptualization was instrumental in bringing relief to an agoraphobic patient's distress and disabilities. | Agoraphobia: indications for the application of the multimodal behavioral conceptualization. Agoraphobia, characterized as fear of going into public places, vehicles, shops, streets, and so forth, is a prevalent syndrome which permeates the patient's life. The efficacy of psychoanalytic, behavioral, and pharmacological treatments has been disappointing. The pervasive nature of agoraphobia dictates that its treatment is most efficacious when a combination of separate although interactive techniques is applied in concert. A multimodal behavioral conceptualization provides the vehicle for the systematic combined application of seemingly diverse individual approaches through monitoring and treating the BASIC ID, an acronym for behavior, affect, sensation, imagery, cognition, interpersonal relationships, and drugs. In an illustrative case, application of the multimodal behavioral conceptualization was instrumental in bringing relief to an agoraphobic patient's distress and disabilities. | [
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|
PMID:13160 | Homosynaptic depression and transmitter turnover in spinal monosynaptic pathway. | 1. The transmission in the spinal monosynaptic pathway was studied during repetitive stimulation of a motor nerve by 10 stimuli at 2, 5, or 10 Hz in spinal cats. Initially, the amplitudes of the monosynaptic responses rapidly declined, reaching a plateau after a few stimuli. The level of the plateau was inversely related to the frequency of stimulation. 2. This depression of monosynaptic response was seen only when the same pathway was stimulated; the response elicited from the lateral gastrocnemius was not depressed when preceded by stimulation of the medial gastrocnemius nerve and vice versa. Pretreatment with semicarbazide left the homosynaptic depression unchanged while suppressing the dorsal root reflex. The participation of a depolarization of primary afferents in the described depression is, therefore, unlikely. 3. The decrease of transmitter release by successive volleys, which is the cause of the observed depression, could conceivably be related to the depletion of transmitter stores. 4. A procedure is described, based on this assumption, which allows the calculation of transmitter turnover. The input-output relation in the spinal monosynaptic pathway is used to convert the amplitudes of monosynaptic responses to the amounts of transmitter, both relative to the maximum response. The changes of transmitter release are analyzed under the assumption that each volley releases instantaneously a constant fraction of the transmitter store available for release and that this store is replenished at a constant fraction of the depleted part per second. 5. The values of fractional release per volley were about 0.4, irrespective of frequency of stimulation. 6. The values of fractional replenishment per second ranged from about 1 to 5 on the average, depending directly on the frequency of stimulation. 7. It is suggested that the described procedure might be useful in analyzing drug effects on synaptic transmission. | Homosynaptic depression and transmitter turnover in spinal monosynaptic pathway. 1. The transmission in the spinal monosynaptic pathway was studied during repetitive stimulation of a motor nerve by 10 stimuli at 2, 5, or 10 Hz in spinal cats. Initially, the amplitudes of the monosynaptic responses rapidly declined, reaching a plateau after a few stimuli. The level of the plateau was inversely related to the frequency of stimulation. 2. This depression of monosynaptic response was seen only when the same pathway was stimulated; the response elicited from the lateral gastrocnemius was not depressed when preceded by stimulation of the medial gastrocnemius nerve and vice versa. Pretreatment with semicarbazide left the homosynaptic depression unchanged while suppressing the dorsal root reflex. The participation of a depolarization of primary afferents in the described depression is, therefore, unlikely. 3. The decrease of transmitter release by successive volleys, which is the cause of the observed depression, could conceivably be related to the depletion of transmitter stores. 4. A procedure is described, based on this assumption, which allows the calculation of transmitter turnover. The input-output relation in the spinal monosynaptic pathway is used to convert the amplitudes of monosynaptic responses to the amounts of transmitter, both relative to the maximum response. The changes of transmitter release are analyzed under the assumption that each volley releases instantaneously a constant fraction of the transmitter store available for release and that this store is replenished at a constant fraction of the depleted part per second. 5. The values of fractional release per volley were about 0.4, irrespective of frequency of stimulation. 6. The values of fractional replenishment per second ranged from about 1 to 5 on the average, depending directly on the frequency of stimulation. 7. It is suggested that the described procedure might be useful in analyzing drug effects on synaptic transmission. | [
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|
PMID:13161 | A quantitative study of leukocyte cohesion: effects of divalent cations and pH. | Leukocyte cell-to-cell adhesion was studied with a cell monolayer technique. The amount of protein retained on the coverslip reflected the number of adhering cells. When polymorphonuclear leukocytes were suspended in a balanced salt solution at neutral pH containing no bivalent cations, they adhered to the glass surface but not to each other. Magnesium or calcium at concentrations above 1 mM caused cell-to-cell adhesion. Stannous and chromate ions had no effect on leukocyte cell-to-cell adhesion. Acid pH also induced leukocyte aggregation. This last effect could be reversed by washing the cells with a balanced salt solution at neutral pH, but it could not be reversed by alcohol. | A quantitative study of leukocyte cohesion: effects of divalent cations and pH. Leukocyte cell-to-cell adhesion was studied with a cell monolayer technique. The amount of protein retained on the coverslip reflected the number of adhering cells. When polymorphonuclear leukocytes were suspended in a balanced salt solution at neutral pH containing no bivalent cations, they adhered to the glass surface but not to each other. Magnesium or calcium at concentrations above 1 mM caused cell-to-cell adhesion. Stannous and chromate ions had no effect on leukocyte cell-to-cell adhesion. Acid pH also induced leukocyte aggregation. This last effect could be reversed by washing the cells with a balanced salt solution at neutral pH, but it could not be reversed by alcohol. | [
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|
PMID:13163 | Contract systems and grading policies. | The contract system can be a motivating factor to student learning. Caution is necessary to ensure the students who are graduating from the program have the knowledge base to pass the SBTPE. The faculty of one program believe their contract system which has evolved from five years of experience meets these criteria. Furthermore, patient care ultimately benefits. The nursing student exposed to an educational system in which his individual worth is recognized and learning needs met can respect the patient's rights and his individual health needs. | Contract systems and grading policies. The contract system can be a motivating factor to student learning. Caution is necessary to ensure the students who are graduating from the program have the knowledge base to pass the SBTPE. The faculty of one program believe their contract system which has evolved from five years of experience meets these criteria. Furthermore, patient care ultimately benefits. The nursing student exposed to an educational system in which his individual worth is recognized and learning needs met can respect the patient's rights and his individual health needs. | [
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|
PMID:13159 | Cyanide intoxication in Macaca mulatta. Physiological and neuropathological aspects. | Sodium cyanide was infused intravenously in 11 lightly anaesthetised and spontaneously breathing M. mulatta. In most, the EEG, ECG, respiratory rate, blood pressure, cerebral venous sinus pressure, end-tidal pCO2 and body temperature were recorded. Blood gases, pH, lactate and pyruvate were estimated in arterial and venous sinus blood samples. There was an initial hyperventilation with tetany in all animals. A rapid rate of cyanide infusion led to apnoea. An isoelectric or near-isoelectric EEG was usually precipitated by bradycardia often with additional hypotension. Neither epileptic seizures nor their EEG concomitants were seen at any stage. Three animals died of early heart failure. Brain damage was seen in 4 animals surviving up to 98 hr. White matter was involved in all. Ischaemic neuronal alterations, restricted to the striatum of one animal, were attributed to major circulatory complications. It was concluded that under these experimental conditions there is no evidence for hypoxic neuronal damage of purely histotoxic type. | Cyanide intoxication in Macaca mulatta. Physiological and neuropathological aspects. Sodium cyanide was infused intravenously in 11 lightly anaesthetised and spontaneously breathing M. mulatta. In most, the EEG, ECG, respiratory rate, blood pressure, cerebral venous sinus pressure, end-tidal pCO2 and body temperature were recorded. Blood gases, pH, lactate and pyruvate were estimated in arterial and venous sinus blood samples. There was an initial hyperventilation with tetany in all animals. A rapid rate of cyanide infusion led to apnoea. An isoelectric or near-isoelectric EEG was usually precipitated by bradycardia often with additional hypotension. Neither epileptic seizures nor their EEG concomitants were seen at any stage. Three animals died of early heart failure. Brain damage was seen in 4 animals surviving up to 98 hr. White matter was involved in all. Ischaemic neuronal alterations, restricted to the striatum of one animal, were attributed to major circulatory complications. It was concluded that under these experimental conditions there is no evidence for hypoxic neuronal damage of purely histotoxic type. | [
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|
PMID:13166 | Effect of dietary pH on amino acid utilization and the lysine requirement of fingerling channel catfish. | The pH of amino acid test diets has been shown to be of major importance in dietary amino acid studies in the channel catfish (Ictalurus punctatus). Maximum growth rate and feed conversion was observed when the test diet was adjusted to pH 7. Growth studies, utilizing a 24% crude protein diet containing an amino acid pattern similar to whole egg protein, indicate that the lysine requirement for fingerling channel catfish is about 1.23% of the diet (dry weight basis) or 5.1% of the dietary protein. The dietary requirement was confirmed by serum free lysine analysis. A marked increase in serum free lysine occurred at a dietary lysine level of approximately 1.2% of the diet. | Effect of dietary pH on amino acid utilization and the lysine requirement of fingerling channel catfish. The pH of amino acid test diets has been shown to be of major importance in dietary amino acid studies in the channel catfish (Ictalurus punctatus). Maximum growth rate and feed conversion was observed when the test diet was adjusted to pH 7. Growth studies, utilizing a 24% crude protein diet containing an amino acid pattern similar to whole egg protein, indicate that the lysine requirement for fingerling channel catfish is about 1.23% of the diet (dry weight basis) or 5.1% of the dietary protein. The dietary requirement was confirmed by serum free lysine analysis. A marked increase in serum free lysine occurred at a dietary lysine level of approximately 1.2% of the diet. | [
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|
PMID:13167 | Rat liver glutathione: possible role as a reservoir of cysteine. | Rat liver contains a high concentration (7-8mM) of reduced glutathione and its level changes rapidly when starving or feeding rats. We concluded that one of the functions of liver glutathione was to act as a reservoir of cysteine. When starved rats were fed a protein-free diet, the increase in liver glutathione was dependent on the amount of cysteine added to the diet. A cysteine-dependent increase of glutathione was also observed in rats fed a diet containing gelatin with cysteine, but the increase was relatively lowered compared with rats fed a protein-free diet containing the same amount of cysteine. This suppression of the increase in glutathione was observed much more clearly when the gelatin diet was fortified with tryptophan in addition to cysteine. In the presence of tryptophan, L-[35S]-cysteine in the diet appeared to be incorporated primarily into liver and serum proteins, and degradation of liver glutathione must also have been enhanced. Addition of excess cysteine to the diet masked the effects of gelatin and tryptophan, stimulated glutathione synthesis in the liver as well as incorporation of dietary cysteine into protein fractions. Prolonged starvation of rats or injection of dibutyryl-3',5'-cyclic AMP lowered the glutathione level,but the level did not decrease below 2 to 3 mM. These findings suggest that there may be at least two pools of glutathione. A labile fraction, constituting one-third to one-half the total liver glutathione, probably serves as a reservoir of cysteine which can be released by gamma-glutamyl-transferase when necessary. | Rat liver glutathione: possible role as a reservoir of cysteine. Rat liver contains a high concentration (7-8mM) of reduced glutathione and its level changes rapidly when starving or feeding rats. We concluded that one of the functions of liver glutathione was to act as a reservoir of cysteine. When starved rats were fed a protein-free diet, the increase in liver glutathione was dependent on the amount of cysteine added to the diet. A cysteine-dependent increase of glutathione was also observed in rats fed a diet containing gelatin with cysteine, but the increase was relatively lowered compared with rats fed a protein-free diet containing the same amount of cysteine. This suppression of the increase in glutathione was observed much more clearly when the gelatin diet was fortified with tryptophan in addition to cysteine. In the presence of tryptophan, L-[35S]-cysteine in the diet appeared to be incorporated primarily into liver and serum proteins, and degradation of liver glutathione must also have been enhanced. Addition of excess cysteine to the diet masked the effects of gelatin and tryptophan, stimulated glutathione synthesis in the liver as well as incorporation of dietary cysteine into protein fractions. Prolonged starvation of rats or injection of dibutyryl-3',5'-cyclic AMP lowered the glutathione level,but the level did not decrease below 2 to 3 mM. These findings suggest that there may be at least two pools of glutathione. A labile fraction, constituting one-third to one-half the total liver glutathione, probably serves as a reservoir of cysteine which can be released by gamma-glutamyl-transferase when necessary. | [
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|
PMID:13168 | Fatty acid synthesis in testes of fat-deficient and fat-supplemented rats. | Fatty acid synthesis was studied in testes of rats fed a fat-free or fat-supplemented diet. Testes of fat-deficient rats incorporated nearly twice as much intratesticularly injected [1-14C]acetate into total fatty acids (primarily into palmitic acid) as did supplemented rats. To determine the mechanism for the increased synthesis, the activities of the following enzymes were determined in the cytoplasmic fraction of testicular homogenates: fatty acid synthetase, acetyl CoA carboxylase [EC 6.4.1.2], citrate-cleavage [EC 4.1.3.8], malic [EC 1.1.1.38], and the glucose-l-phosphate dehydrogenase [EC 1.1.1.49]: 6-phosphogluconate dehydrogenase pair [EC 1.1.1.44]. Although the activity of fatty acid synthetase did increase in livers from fat-deficient rats, no change was observed in corresponding testes. No difference between the two groups could be demonstrated in testicular activity of citrate-cleavage enzyme, malic enzyme, or the glucose-6-phosphate dehydrogenase: 6-phosphogluconate dehydrogenase pair. However, the activity of cytoplasmic acetyl CoA carboxylase in testes of rats fed the fat-deficient diet was 1.4 times higher than the activity in testes of rats fed the supplemented diet. Fat deficiency did not affect the specific activity of the testicular microsomal elongation system, assayed by incubation with 14C-malonyl CoA. The concentration of unesterified fatty acids was lower in testes of the fat-deficient compared to supplemented rats, indicating that decreased inhibition of acetyl CoA carboxylase in the fat-deficient rats testes might have been responsible for the observed increased de novo synthesis of palmitic acid. | Fatty acid synthesis in testes of fat-deficient and fat-supplemented rats. Fatty acid synthesis was studied in testes of rats fed a fat-free or fat-supplemented diet. Testes of fat-deficient rats incorporated nearly twice as much intratesticularly injected [1-14C]acetate into total fatty acids (primarily into palmitic acid) as did supplemented rats. To determine the mechanism for the increased synthesis, the activities of the following enzymes were determined in the cytoplasmic fraction of testicular homogenates: fatty acid synthetase, acetyl CoA carboxylase [EC 6.4.1.2], citrate-cleavage [EC 4.1.3.8], malic [EC 1.1.1.38], and the glucose-l-phosphate dehydrogenase [EC 1.1.1.49]: 6-phosphogluconate dehydrogenase pair [EC 1.1.1.44]. Although the activity of fatty acid synthetase did increase in livers from fat-deficient rats, no change was observed in corresponding testes. No difference between the two groups could be demonstrated in testicular activity of citrate-cleavage enzyme, malic enzyme, or the glucose-6-phosphate dehydrogenase: 6-phosphogluconate dehydrogenase pair. However, the activity of cytoplasmic acetyl CoA carboxylase in testes of rats fed the fat-deficient diet was 1.4 times higher than the activity in testes of rats fed the supplemented diet. Fat deficiency did not affect the specific activity of the testicular microsomal elongation system, assayed by incubation with 14C-malonyl CoA. The concentration of unesterified fatty acids was lower in testes of the fat-deficient compared to supplemented rats, indicating that decreased inhibition of acetyl CoA carboxylase in the fat-deficient rats testes might have been responsible for the observed increased de novo synthesis of palmitic acid. | [
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PMID:13169 | Induction of pyridoxal phosphate-dependent enzymes in vitamin B-6 deficient rats. | The effectiveness of dietary and hormonal treatments in inducing several pyridoxal phosphate-(PLP)-dependent enzymes has been examined in vitamin B-6 deficient rats. Holo- and apoenzymes of serine dehydratase and ornithine aminotransferase were inducible in both control and deficient rats by feeding them 80% casein diets or by injecting them with glucagon. Holo- and apotyrosine aminotransferase were induced in both control and deficient rats by injecting them with glucagon or with dexamethasone phosphate. Phosphoenolpyruvate carboxykinase, a non-PLP-dependent enzyme, was inducible in both control and deficient rats by glucagon treatment if the rats were fed, but not if they had been starved. The degree of induction of certain enzymes depended upon whether rats were fed ad libitum, starved overnight, or fed a protein-free diet prior to the induction period. Phosphoenolpyruvate carboxykinase activities were about the same in both control and deficient rats. In vitamin B-6 deficient rats, both uninduced and induced activities of serine dehydratase, ornithine aminotransferase, and tyrosine aminotransferase assayed in the prsence of PLP, but not in its absence, either equaled or exceeded control values under most experimental conditions. Synthesis of excess of apoenzyme of PLP-dependent enzymes generally accounted for the high total enzyme activity in deficient rats. Differences between values for control and deficient rats could not be accounted for by differences in liver cyclic AMP concentrations nor were they apparently related to reduced food intake of the deficient rats. High apoenzyme concentration during depletion of coenzyme would tend to prevent depletion of active enzyme. | Induction of pyridoxal phosphate-dependent enzymes in vitamin B-6 deficient rats. The effectiveness of dietary and hormonal treatments in inducing several pyridoxal phosphate-(PLP)-dependent enzymes has been examined in vitamin B-6 deficient rats. Holo- and apoenzymes of serine dehydratase and ornithine aminotransferase were inducible in both control and deficient rats by feeding them 80% casein diets or by injecting them with glucagon. Holo- and apotyrosine aminotransferase were induced in both control and deficient rats by injecting them with glucagon or with dexamethasone phosphate. Phosphoenolpyruvate carboxykinase, a non-PLP-dependent enzyme, was inducible in both control and deficient rats by glucagon treatment if the rats were fed, but not if they had been starved. The degree of induction of certain enzymes depended upon whether rats were fed ad libitum, starved overnight, or fed a protein-free diet prior to the induction period. Phosphoenolpyruvate carboxykinase activities were about the same in both control and deficient rats. In vitamin B-6 deficient rats, both uninduced and induced activities of serine dehydratase, ornithine aminotransferase, and tyrosine aminotransferase assayed in the prsence of PLP, but not in its absence, either equaled or exceeded control values under most experimental conditions. Synthesis of excess of apoenzyme of PLP-dependent enzymes generally accounted for the high total enzyme activity in deficient rats. Differences between values for control and deficient rats could not be accounted for by differences in liver cyclic AMP concentrations nor were they apparently related to reduced food intake of the deficient rats. High apoenzyme concentration during depletion of coenzyme would tend to prevent depletion of active enzyme. | [
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PMID:13170 | Effect of cholesterol feeding on tissue lipid perioxidation, glutathione peroxidase activity and liver microsomal functions in rats and guinea pigs. | The effect of cholesterol feeding on liver and aortic nonenzymatic lipid peroxidation and glutathione peroxidase activities, and on liver microsomal NADPH-dependent lipid peroxidation, codeine hydroxylation and cytochrome P-450 levels was examined in rats and guinea pigs. One percent cholesterol was added to a casein-sucrose-soybean oil basal diet for rats or a stock diet with 2% soybean oil for guinea pigs. The effect of vitamin E and cholestyramine was also examined in some experiments. Cholesterol feeding increased the rate of lipid peroxidation in liver and aortic homogenate both in rats and guinea pigs when fed non-vitamin E supplemented basal diets. Vitamin E supplementation prevented the increase in the aorta, but not as completely in the liver in rats, while the reverse was true in guinea pigs. The effect of cholestyramine was dependent on the level of vitamin E in the diet. Cholesterol feeding decreased glutathione peroxidase activities in rats and guinea pigs. In guinea pigs, cholesterol feeding also markedly decreased liver microsomal NADPH-dependent lipid peroxidation, codein hydroxylation and cytochrome P-450 levels especially when fed non-vitamin E supplemented basal diets. In rats, cholesterol feeding reduced liver microsomal NADPH-dependent lipid peroxidation and in some cases, increased microsomal codeine hydroxylation activities, but had no effect on microsomal cytochrome P-450 levels. Vitamin E supplementation increased liver and serum cholesterol levels in guinea pigs, but had no such effect in rats. Results of this study indicate that cholesterol feeding can result in various metabolic alterations in rats and guinea pigs. The implication of these alterations in atherogenesis requires further investigations. | Effect of cholesterol feeding on tissue lipid perioxidation, glutathione peroxidase activity and liver microsomal functions in rats and guinea pigs. The effect of cholesterol feeding on liver and aortic nonenzymatic lipid peroxidation and glutathione peroxidase activities, and on liver microsomal NADPH-dependent lipid peroxidation, codeine hydroxylation and cytochrome P-450 levels was examined in rats and guinea pigs. One percent cholesterol was added to a casein-sucrose-soybean oil basal diet for rats or a stock diet with 2% soybean oil for guinea pigs. The effect of vitamin E and cholestyramine was also examined in some experiments. Cholesterol feeding increased the rate of lipid peroxidation in liver and aortic homogenate both in rats and guinea pigs when fed non-vitamin E supplemented basal diets. Vitamin E supplementation prevented the increase in the aorta, but not as completely in the liver in rats, while the reverse was true in guinea pigs. The effect of cholestyramine was dependent on the level of vitamin E in the diet. Cholesterol feeding decreased glutathione peroxidase activities in rats and guinea pigs. In guinea pigs, cholesterol feeding also markedly decreased liver microsomal NADPH-dependent lipid peroxidation, codein hydroxylation and cytochrome P-450 levels especially when fed non-vitamin E supplemented basal diets. In rats, cholesterol feeding reduced liver microsomal NADPH-dependent lipid peroxidation and in some cases, increased microsomal codeine hydroxylation activities, but had no effect on microsomal cytochrome P-450 levels. Vitamin E supplementation increased liver and serum cholesterol levels in guinea pigs, but had no such effect in rats. Results of this study indicate that cholesterol feeding can result in various metabolic alterations in rats and guinea pigs. The implication of these alterations in atherogenesis requires further investigations. | [
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PMID:13171 | Role of ascorbic acid on tyrosine hydroxylase activity in the adrenal gland of guinea pig. | The decrease of tyrosine hydroxylase activity in adrenal homogenate in scurvy was recovered after the administration of ascorbic acid. The causes of the increase in the enzyme activity after the administration of ascorbic acid have been studied. 1. No significant elevation in the enzyme activity was observed after the administration of reserpine to the scortutic guinea pig. 2. A dose of metal chelating agent, alpha, alpha'-dipyridyl, prevented the ascorbic acid-induced or reserpine-induced increase in enzyme activity in the scorbutic and the non-scorbutic guinea pigs, respectively. 3. Tyrosine hydroxylase activity was partially recovered by the administration of FeSO4 to the scorbutic guinea pig. From these results, it became clear that the induction of tyrosine hydroxylase which was not observed in scurvy was due to the deficiency of Fe2+. These results suggested that ascorbic acid affected the induction of this enzyme via Fe2+. | Role of ascorbic acid on tyrosine hydroxylase activity in the adrenal gland of guinea pig. The decrease of tyrosine hydroxylase activity in adrenal homogenate in scurvy was recovered after the administration of ascorbic acid. The causes of the increase in the enzyme activity after the administration of ascorbic acid have been studied. 1. No significant elevation in the enzyme activity was observed after the administration of reserpine to the scortutic guinea pig. 2. A dose of metal chelating agent, alpha, alpha'-dipyridyl, prevented the ascorbic acid-induced or reserpine-induced increase in enzyme activity in the scorbutic and the non-scorbutic guinea pigs, respectively. 3. Tyrosine hydroxylase activity was partially recovered by the administration of FeSO4 to the scorbutic guinea pig. From these results, it became clear that the induction of tyrosine hydroxylase which was not observed in scurvy was due to the deficiency of Fe2+. These results suggested that ascorbic acid affected the induction of this enzyme via Fe2+. | [
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PMID:13172 | The effect of C.P.A.P. upon pulmonary reserve and cardiac output under increased abdominal pressure. | The cardiopulmonary effects of CPAP under conditions of increased intra-abdominal pressure were studied using the rabbit as an experimental model. Central venous pressure and cardiac output were reduced when the intra-abdominal pressure was increased. Addition of CPAP caused a further reduction in C.V.P. and C.O. Despite these reductions CPAP significantly improved arterial PaO2 without significant effects on pH and PaCO2. The use of CPAP in conditions associated with pulmonary dysfunction secondary to increased intraabdominal pressure may be a definite therapeutic modality. | The effect of C.P.A.P. upon pulmonary reserve and cardiac output under increased abdominal pressure. The cardiopulmonary effects of CPAP under conditions of increased intra-abdominal pressure were studied using the rabbit as an experimental model. Central venous pressure and cardiac output were reduced when the intra-abdominal pressure was increased. Addition of CPAP caused a further reduction in C.V.P. and C.O. Despite these reductions CPAP significantly improved arterial PaO2 without significant effects on pH and PaCO2. The use of CPAP in conditions associated with pulmonary dysfunction secondary to increased intraabdominal pressure may be a definite therapeutic modality. | [
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|
PMID:13173 | Oral factitious injuries. | The subject of oral factitious injuries is reviewed and four cases are reported. It is noted that self-inflicted oral injuries are not limited to the soft tissue but may result in destruction of bone and tooth structure. While children are more often the subjects of self-injurious behavior about the oral cavity, adults may also exhibit similar conduct. Emotional problems are often co-existent with self-inflicted oral injuries, however, in some cases there does not seem to be a readily descernible emotional disturbance. Since factitious injuries often pose diagnostic problems for the dentist, some diagnostic suggestions are included. | Oral factitious injuries. The subject of oral factitious injuries is reviewed and four cases are reported. It is noted that self-inflicted oral injuries are not limited to the soft tissue but may result in destruction of bone and tooth structure. While children are more often the subjects of self-injurious behavior about the oral cavity, adults may also exhibit similar conduct. Emotional problems are often co-existent with self-inflicted oral injuries, however, in some cases there does not seem to be a readily descernible emotional disturbance. Since factitious injuries often pose diagnostic problems for the dentist, some diagnostic suggestions are included. | [
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|
PMID:13174 | Acute anti-inflammatory effects of aspirin and dexamethasone in rats deprived of endogenous prostaglandin precursors. | Paw oedema, induced by carrageenan, was potentiated in normal rats by arachidonic acid and bishomo-gamma-linoleic acid, but not by 5,8,11-eicosatrienoic acid. The latter is not an endogenous prostaglandin precursor, but replaces the other two in essential fatty acid deficient (EFAD) rats. Carrageenan oedema was partially suppressed in these EFAD rats. Aspirin exhibited equal suppression of carrageenan oedema in both normal and EFAD rats, despite the fact that, in the latter, prostaglandins are of negligible importance. The anti-inflammatory effect of dexamethasone was also identical in both normal and EFAD rats. The view that interference with the prostaglandin-system explains the acute anti-inflammatory effects of the two drugs, is discussed, in relation to the present results. | Acute anti-inflammatory effects of aspirin and dexamethasone in rats deprived of endogenous prostaglandin precursors. Paw oedema, induced by carrageenan, was potentiated in normal rats by arachidonic acid and bishomo-gamma-linoleic acid, but not by 5,8,11-eicosatrienoic acid. The latter is not an endogenous prostaglandin precursor, but replaces the other two in essential fatty acid deficient (EFAD) rats. Carrageenan oedema was partially suppressed in these EFAD rats. Aspirin exhibited equal suppression of carrageenan oedema in both normal and EFAD rats, despite the fact that, in the latter, prostaglandins are of negligible importance. The anti-inflammatory effect of dexamethasone was also identical in both normal and EFAD rats. The view that interference with the prostaglandin-system explains the acute anti-inflammatory effects of the two drugs, is discussed, in relation to the present results. | [
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|
PMID:13175 | Dihydroxylated metabolites of cannabinol formed by rat liver in vitro. | Cannabinol (CBN) was metabolized in vitro by a 10,000 g supernatant from rat liver. After removal of unchanged CBN and its monohydroxylated metabolites four dihydroxylated metabolites were isolated. By nuclear magnetic resonance and mass spectrometry the compounds were identified as 1'',7-dihydroxy-CBN. Side chain hydroxylation occurred predominantly at C-4'' anc C-3''. | Dihydroxylated metabolites of cannabinol formed by rat liver in vitro. Cannabinol (CBN) was metabolized in vitro by a 10,000 g supernatant from rat liver. After removal of unchanged CBN and its monohydroxylated metabolites four dihydroxylated metabolites were isolated. By nuclear magnetic resonance and mass spectrometry the compounds were identified as 1'',7-dihydroxy-CBN. Side chain hydroxylation occurred predominantly at C-4'' anc C-3''. | [
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|
PMID:13176 | Oxidation of aliphatic hydroxylamines in aqueous solutions. | The effects of pH, buffer constituents, duration of storage, presence of air, heavy metal ions, extracting solvents and various additives and cofactors on the aerial oxidation of some aliphatic primary and secondary hydroxylamines were investigated. Copper ions were particularly effective catalysts of the oxidation reaction. Conditions to minimize this transformation are described. | Oxidation of aliphatic hydroxylamines in aqueous solutions. The effects of pH, buffer constituents, duration of storage, presence of air, heavy metal ions, extracting solvents and various additives and cofactors on the aerial oxidation of some aliphatic primary and secondary hydroxylamines were investigated. Copper ions were particularly effective catalysts of the oxidation reaction. Conditions to minimize this transformation are described. | [
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|
PMID:13177 | Black lipid membranes as a model for intestinal absorption of drugs. | Black lipid membranes were generated in isotonic buffer (pH 4-5 and pH 6-5) from egg phosphatidylcholine and intestinal lipid, and the permeability to salicylamide, salicylic acid, p-aminobenzoic acid and tryptophan of these membranes was studied. Electrical resistance of intestinal lipid membranes was higher than that of phosphatidylcholine membranes. The presence of cholesterol produced an increase in the electrical resistance of black lipid membranes and a small decrease in the permeability of membranes to drugs. The permeability coefficient of salicylamide, an uncharged drug, was much larger than the coefficients of the charged drugs examined. The values for salicylic acid and p-aminobenzoic acid were much larger than comparable values predicted from their partition coefficients. Intestinal lipid membranes were more permeable to acidic drugs than phosphatidylcholine membranes. It is suggested that phospholipids and other lipid components of the small intestine may play an important role in the membrane permeability to acidic drugs. This method may be of interest in studying the complex processes of drug absorption from intestine. | Black lipid membranes as a model for intestinal absorption of drugs. Black lipid membranes were generated in isotonic buffer (pH 4-5 and pH 6-5) from egg phosphatidylcholine and intestinal lipid, and the permeability to salicylamide, salicylic acid, p-aminobenzoic acid and tryptophan of these membranes was studied. Electrical resistance of intestinal lipid membranes was higher than that of phosphatidylcholine membranes. The presence of cholesterol produced an increase in the electrical resistance of black lipid membranes and a small decrease in the permeability of membranes to drugs. The permeability coefficient of salicylamide, an uncharged drug, was much larger than the coefficients of the charged drugs examined. The values for salicylic acid and p-aminobenzoic acid were much larger than comparable values predicted from their partition coefficients. Intestinal lipid membranes were more permeable to acidic drugs than phosphatidylcholine membranes. It is suggested that phospholipids and other lipid components of the small intestine may play an important role in the membrane permeability to acidic drugs. This method may be of interest in studying the complex processes of drug absorption from intestine. | [
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|
PMID:13178 | Hydrolysis of digoxin by acid. | Predictable hydrolysis of [3H]digoxin-12alpha occurred in vitro with incubation in HCl or gastric juice. Hydrolysis varied with pH, time, temperature and agitation. Digoxin, the bis- and mono-digitoxosides of digoxigenin and digoxigenin were separated by silica gel thin-layer chromatography using chloroform-ethyl acetate-glacial acetic acid (25:25:1 v/v) and were quantitated by liquid scintillation spectrometry. Hydrolysis with incubation at 37 degrees and pH 3 for 90 min was minimal, but increased with increasing acidity until greater than 70% was hydrolysed at pH 1-2 after 30 min and greater than 96% after 90 min incubation. At pH 0-9, 87% was hydrolysed after 30 min. In vitro hydrolysis in gastric fluid was slightly less than in HCl at the same pH. A volunteer was given 150 muCi[3H]digoxin-12alpha by nasogastric tube during a pentagastrin infusion when gastric pH was 0-94. He remained on his left side and samples were aspirated at intervals and immediately neutralized. Ethanol-chloroform 50-50 (v/v) extracts of the gastric fluid aspirated after 90 min and of all the urine specimens collected for 5 days were applied to a DEAE Sephadex LH-20 column. The radioactivity appeared in a single peak as digoxigenin in the 90 min gastric aspirate and in all urine specimens. Extensive intragastric hydrolysis of digoxin may occur under conditions of maximum acid output. | Hydrolysis of digoxin by acid. Predictable hydrolysis of [3H]digoxin-12alpha occurred in vitro with incubation in HCl or gastric juice. Hydrolysis varied with pH, time, temperature and agitation. Digoxin, the bis- and mono-digitoxosides of digoxigenin and digoxigenin were separated by silica gel thin-layer chromatography using chloroform-ethyl acetate-glacial acetic acid (25:25:1 v/v) and were quantitated by liquid scintillation spectrometry. Hydrolysis with incubation at 37 degrees and pH 3 for 90 min was minimal, but increased with increasing acidity until greater than 70% was hydrolysed at pH 1-2 after 30 min and greater than 96% after 90 min incubation. At pH 0-9, 87% was hydrolysed after 30 min. In vitro hydrolysis in gastric fluid was slightly less than in HCl at the same pH. A volunteer was given 150 muCi[3H]digoxin-12alpha by nasogastric tube during a pentagastrin infusion when gastric pH was 0-94. He remained on his left side and samples were aspirated at intervals and immediately neutralized. Ethanol-chloroform 50-50 (v/v) extracts of the gastric fluid aspirated after 90 min and of all the urine specimens collected for 5 days were applied to a DEAE Sephadex LH-20 column. The radioactivity appeared in a single peak as digoxigenin in the 90 min gastric aspirate and in all urine specimens. Extensive intragastric hydrolysis of digoxin may occur under conditions of maximum acid output. | [
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|
PMID:13179 | The effect of compression on some physical properties of microcrystalline cellulose powders. | Tablets have been prepared from previously characterized microcrystalline cellulose (Avicel) powders, using an instrumented single station tablet machine. The regenerated particle size was found to increase in compaction pressure. Compaction caused a slight initial decrease in B.E.T. surface area, followed by an increase mainly as a result of elastic recovery of the particles. The intra-particulate pore size distribution showed no change throughout the range of compaction pressures studied, demonstrating that the internal pores did not collapse. Measurement of the interparticulate porosity by mercury porosimetry, liquid penetration techniques and scanning electron microscopy showed a decrease in this parameter with increase in compaction pressure. The dissolution behaviour from the compacts showed in general a decreased rate with increase in compaction pressure, that from the cellulose grade PH 105 being slower than from the remaining grades. | The effect of compression on some physical properties of microcrystalline cellulose powders. Tablets have been prepared from previously characterized microcrystalline cellulose (Avicel) powders, using an instrumented single station tablet machine. The regenerated particle size was found to increase in compaction pressure. Compaction caused a slight initial decrease in B.E.T. surface area, followed by an increase mainly as a result of elastic recovery of the particles. The intra-particulate pore size distribution showed no change throughout the range of compaction pressures studied, demonstrating that the internal pores did not collapse. Measurement of the interparticulate porosity by mercury porosimetry, liquid penetration techniques and scanning electron microscopy showed a decrease in this parameter with increase in compaction pressure. The dissolution behaviour from the compacts showed in general a decreased rate with increase in compaction pressure, that from the cellulose grade PH 105 being slower than from the remaining grades. | [
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|
PMID:13180 | The action of colloidal silicon dioxide as a glidant for lactose, paracetamol, oxytetracycline and their mixtures. | Anomalies are observed in some of the physical and mechanical properties of mixtures of lactose, paracetamol and oxytetracycline when small amounts of colloidal silicon dioxide are added to them. Owing to its differing propensities to coat the particles of the host powders, the silicon dioxide acts as a glidant for the lactose and paracetamol, but as an antiglidant for the oxytetracycline. | The action of colloidal silicon dioxide as a glidant for lactose, paracetamol, oxytetracycline and their mixtures. Anomalies are observed in some of the physical and mechanical properties of mixtures of lactose, paracetamol and oxytetracycline when small amounts of colloidal silicon dioxide are added to them. Owing to its differing propensities to coat the particles of the host powders, the silicon dioxide acts as a glidant for the lactose and paracetamol, but as an antiglidant for the oxytetracycline. | [
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|
PMID:13193 | Brain areas involved in the catecholamine mediated regulation of electroshock seizure intensity. | Selective treatments which alter the catecholamine content of discrete areas of the brain were tested for their effect on electroshock seizure intensity in the rat. The data indicate that depletion of noradrenaline and dopamine in near ventricular areas by the intracerebroventricular administration of the benzoquinolizine, Ro 4-1284, enhances electroshock seizure intensity. The enhancement of seizure produced by systemic Ro 4-1284 was antagonized by the intracerebroventricular injection of noradrenaline or dopamine which do not appear to penetrate more than 1 mm into the brain. Further, pretreatment with systemic iproniazid and L-dopa completely antagonized the increased seizure intensity produced by intracerebroventricular Ro 4-1284 and repleted brain catecholamines in both near and far ventricular areas. Thus, the effects of both noradrenaline and dopamine in attenuating electroshock seizure intensity appear to be exerted principally through periventricular structures. | Brain areas involved in the catecholamine mediated regulation of electroshock seizure intensity. Selective treatments which alter the catecholamine content of discrete areas of the brain were tested for their effect on electroshock seizure intensity in the rat. The data indicate that depletion of noradrenaline and dopamine in near ventricular areas by the intracerebroventricular administration of the benzoquinolizine, Ro 4-1284, enhances electroshock seizure intensity. The enhancement of seizure produced by systemic Ro 4-1284 was antagonized by the intracerebroventricular injection of noradrenaline or dopamine which do not appear to penetrate more than 1 mm into the brain. Further, pretreatment with systemic iproniazid and L-dopa completely antagonized the increased seizure intensity produced by intracerebroventricular Ro 4-1284 and repleted brain catecholamines in both near and far ventricular areas. Thus, the effects of both noradrenaline and dopamine in attenuating electroshock seizure intensity appear to be exerted principally through periventricular structures. | [
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|
PMID:13196 | Simultaneous determination of 4-nitroanisole, 4-nitrophenol, and 4-nitrocatechol by phase-sensitive ac polarography. | Phase-sensitive ac polarography was applied to the simultaneous quantitative determination of 4-nitroanisole, 4-nitrophenol, and 4-nitrocatechol in alkaline solutions. Certain experimental precautions are necessary to determine each compound in the presence of the other two. Thus, 4-nitrocatechol is determined indirectly by forming a yellow ratio chelate with cupric ions, wheras 4-nitroansole is determined directly by the reduction waves of the nitro group. For the determination of 4-nitrophenol, the interferency by the simultaneously present 4-nitrocatechol must be eliminated by masking it by the addition of magnesium ions. The method described permits a qualitative and quantitative analysis of all three compounds in one solution since linear calibration curves are obtained. | Simultaneous determination of 4-nitroanisole, 4-nitrophenol, and 4-nitrocatechol by phase-sensitive ac polarography. Phase-sensitive ac polarography was applied to the simultaneous quantitative determination of 4-nitroanisole, 4-nitrophenol, and 4-nitrocatechol in alkaline solutions. Certain experimental precautions are necessary to determine each compound in the presence of the other two. Thus, 4-nitrocatechol is determined indirectly by forming a yellow ratio chelate with cupric ions, wheras 4-nitroansole is determined directly by the reduction waves of the nitro group. For the determination of 4-nitrophenol, the interferency by the simultaneously present 4-nitrocatechol must be eliminated by masking it by the addition of magnesium ions. The method described permits a qualitative and quantitative analysis of all three compounds in one solution since linear calibration curves are obtained. | [
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|
PMID:13197 | Kinetics of hydrolysis of fenclorac. | The kinetics of hydrolysis of fenclorac were studied to determine its stability in aqueous solution at different pH's and temperatures. For this study, a stability-specific liquid chromatographic assay method was developed to separate fenclorac from its hydrolysis product, alpha-hydroxy-3-chloro-4-cyclohexylbenzeneacetic acid. The k-pH profile in the 0-12 pH range in various buffer solutions shows that fenclorac is stable in its undissociated form in strongly acidic media and is unstable in neutral and alkaline media. The instability of fenclorac in aqueous solution is proportional to the degree of ionization of the carboxyl group in the 1-4 pH range and is independent of pH above 4. The rate-determining step in the mechanism of hydrolysis of fenclorac involves ionization of the carbon-chlorine bond. The ionization is catalyzed by an intramolecular necleophilic attack on the alpha-carbon by the dissociated carboxyl group, resulting in the formation of an unstable intermediate, a three-membered ring lactone. This unstable intermediate rapidly hydrolyzes to the final hydrolysis product. This mechanism is supported by experimental evidence such as the medium effect, positive salt effect, common ion effect, and substituent effect. Arrhenius parameters for the hydrolysis of fenclorac and its 3-nitro substituted analog were obtained. | Kinetics of hydrolysis of fenclorac. The kinetics of hydrolysis of fenclorac were studied to determine its stability in aqueous solution at different pH's and temperatures. For this study, a stability-specific liquid chromatographic assay method was developed to separate fenclorac from its hydrolysis product, alpha-hydroxy-3-chloro-4-cyclohexylbenzeneacetic acid. The k-pH profile in the 0-12 pH range in various buffer solutions shows that fenclorac is stable in its undissociated form in strongly acidic media and is unstable in neutral and alkaline media. The instability of fenclorac in aqueous solution is proportional to the degree of ionization of the carboxyl group in the 1-4 pH range and is independent of pH above 4. The rate-determining step in the mechanism of hydrolysis of fenclorac involves ionization of the carbon-chlorine bond. The ionization is catalyzed by an intramolecular necleophilic attack on the alpha-carbon by the dissociated carboxyl group, resulting in the formation of an unstable intermediate, a three-membered ring lactone. This unstable intermediate rapidly hydrolyzes to the final hydrolysis product. This mechanism is supported by experimental evidence such as the medium effect, positive salt effect, common ion effect, and substituent effect. Arrhenius parameters for the hydrolysis of fenclorac and its 3-nitro substituted analog were obtained. | [
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|
PMID:13198 | The interaction of histamine and guanylnucleotides with cardiac adenylate cyclase and its relationship to cardiac contractility. | Histamine stimulates adenylate cyclase activity in a washed membrane preparation from guinea-pig ventricle. Marked synergistic effects are observed with histamine and GTP. In the absence of GTP, the degree of stimulation of the enzyme by histamine is slight and occurs only in the presence of relatively high concentrations of ATP suggesting that ATP, or contaminating GTP in commercial preparations of ATP, may partially satisfy the guanylnucleotide requirement. The GTP analog, GppNHp, strongly and irreversibly activates the cardiac enzyme. Preincubation studies, in which the membranes are treated with GppNHp alone or in combination with histamine followed by estensive washing, indicate that histamine markedly increases the rate of activation of the enzyme by the guanylnucleotide. It is suggested that the mechanism of action of histamine on adenylate cyclase involves a facilitation of the interaction of guanylnucleotides with the regulatory site of the enzyme. The relative activities for stimulation of adenylate cyclase of a series of histamine analogs correlate quite well with the activities of these derivatives on four H2-receptor systems, including atrial rate and ventricular contractility and do not correlate with the activities on H1-receptors. The H2-receptor antagonists, burimamide and metiamide, competitively inhibit hitamine-stimulated adenylate cyclase and the dissociation constants for these antagonists on the enzyme agree with the pharmacological data on the H2-receptors in the atria and ventricles. Our results suggest that histamine-stimulated cardiac adenylate cyclase can be classified inotorpic and chronotropic effects of histamine on the intact heart. | The interaction of histamine and guanylnucleotides with cardiac adenylate cyclase and its relationship to cardiac contractility. Histamine stimulates adenylate cyclase activity in a washed membrane preparation from guinea-pig ventricle. Marked synergistic effects are observed with histamine and GTP. In the absence of GTP, the degree of stimulation of the enzyme by histamine is slight and occurs only in the presence of relatively high concentrations of ATP suggesting that ATP, or contaminating GTP in commercial preparations of ATP, may partially satisfy the guanylnucleotide requirement. The GTP analog, GppNHp, strongly and irreversibly activates the cardiac enzyme. Preincubation studies, in which the membranes are treated with GppNHp alone or in combination with histamine followed by estensive washing, indicate that histamine markedly increases the rate of activation of the enzyme by the guanylnucleotide. It is suggested that the mechanism of action of histamine on adenylate cyclase involves a facilitation of the interaction of guanylnucleotides with the regulatory site of the enzyme. The relative activities for stimulation of adenylate cyclase of a series of histamine analogs correlate quite well with the activities of these derivatives on four H2-receptor systems, including atrial rate and ventricular contractility and do not correlate with the activities on H1-receptors. The H2-receptor antagonists, burimamide and metiamide, competitively inhibit hitamine-stimulated adenylate cyclase and the dissociation constants for these antagonists on the enzyme agree with the pharmacological data on the H2-receptors in the atria and ventricles. Our results suggest that histamine-stimulated cardiac adenylate cyclase can be classified inotorpic and chronotropic effects of histamine on the intact heart. | [
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|
PMID:13199 | Pharmacologically induced changes in the 3':5'-cyclic guanosine monophosphate content of rat cerebellar cortex: difference between apomorphine, haloperidol and harmaline. | Harmaline increases cerebellar 3':5'-cyclic guanosine monophosphate (cGMP) content in a dose-related manner; this increase is prevented by a pretreatment with 3-acetylpyridine (3-AP) (0.66 mmol/kg) which destroys climbing fibers and inhibits harmaline-induced tremor. The cerebellar cGMP content increases after isoniazid; this response remains unchanged in rats pretreated with 3-AP. Since isoniazid decreases cerebellar gamma-aminobuturic acid (GABA) levels, the increase in cGMP content might reflect a reduction in the availability of GABA at the level of postsynaptic receptors. Apomorphine (a dopamine receptor agonist) and haloperidol (a dopamine receptor blocker) increase or decrease the cGMP content of cerebellar cortex, respectively. Neither drug changes the guanylate cyclase activity of cerebellar homogenates; moreover their action on cerebellar cGMP content persists after 3-AP. Chloropromazine, like haloperidol, decreases the cerebellar cGMP content. The increase in cerebellar cGMP content elicited by apomorphine can be differentiated from that elicited by harmaline or isoniazid; presumably apomorphine indirectly activates mossy fibers. The decrease in cerebellar cGMP content elicited by haloperidol can be differentiated from that elicited by diazepam; perhaps haloperidol reduces the mossy fiber input to the cerebellum. We suggest that the cGMP content of cerebellar cortex fluctuates in response to changes in the afferent stimulatory input to the cerebellum; it increases when the activity of either climbing or mossy fibers is increased; it decreases when either of these two stimulatory inputs is reduced. | Pharmacologically induced changes in the 3':5'-cyclic guanosine monophosphate content of rat cerebellar cortex: difference between apomorphine, haloperidol and harmaline. Harmaline increases cerebellar 3':5'-cyclic guanosine monophosphate (cGMP) content in a dose-related manner; this increase is prevented by a pretreatment with 3-acetylpyridine (3-AP) (0.66 mmol/kg) which destroys climbing fibers and inhibits harmaline-induced tremor. The cerebellar cGMP content increases after isoniazid; this response remains unchanged in rats pretreated with 3-AP. Since isoniazid decreases cerebellar gamma-aminobuturic acid (GABA) levels, the increase in cGMP content might reflect a reduction in the availability of GABA at the level of postsynaptic receptors. Apomorphine (a dopamine receptor agonist) and haloperidol (a dopamine receptor blocker) increase or decrease the cGMP content of cerebellar cortex, respectively. Neither drug changes the guanylate cyclase activity of cerebellar homogenates; moreover their action on cerebellar cGMP content persists after 3-AP. Chloropromazine, like haloperidol, decreases the cerebellar cGMP content. The increase in cerebellar cGMP content elicited by apomorphine can be differentiated from that elicited by harmaline or isoniazid; presumably apomorphine indirectly activates mossy fibers. The decrease in cerebellar cGMP content elicited by haloperidol can be differentiated from that elicited by diazepam; perhaps haloperidol reduces the mossy fiber input to the cerebellum. We suggest that the cGMP content of cerebellar cortex fluctuates in response to changes in the afferent stimulatory input to the cerebellum; it increases when the activity of either climbing or mossy fibers is increased; it decreases when either of these two stimulatory inputs is reduced. | [
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|
PMID:13200 | Propoxyphene and norpropoxyphene: pharmacologic and toxic effects in animals. | alpha-d-Propoxyphene and its principle metabolite, alpha-d-norpropoxyphene, were compared pharmacologically to establish their relative opioid profiles as defined by naloxone reversal. Propoxyphene exhibited opioid activity in the following tests: mouse abdominal constriction and rat tail heat analgesic tests, inhibition of the twitch of the guinea-pig ileum and acute lethality in rodents. Norpropoxyphene also showed opioid activity in the rat tail heat and guinea-pig ileum tests, but exhibited nonopioid activity in the mouse abdominal constriction and acute toxicity studies. Jumping in mice, precipitated by naloxone, suggests the following order for liability to produce physical dependence after repeated administration: morphine greater than codeine greater than propoxyphene greater than norpropoxyphene approximately saline. Propoxyphene and norpropoxyphene depressed axonal conduction in isolated peripheral nerve and were comparable in potency to standard local anesthetic agents. The nonopioid actions of norpropoxyphene might be due in part to its local anesthetic properties. | Propoxyphene and norpropoxyphene: pharmacologic and toxic effects in animals. alpha-d-Propoxyphene and its principle metabolite, alpha-d-norpropoxyphene, were compared pharmacologically to establish their relative opioid profiles as defined by naloxone reversal. Propoxyphene exhibited opioid activity in the following tests: mouse abdominal constriction and rat tail heat analgesic tests, inhibition of the twitch of the guinea-pig ileum and acute lethality in rodents. Norpropoxyphene also showed opioid activity in the rat tail heat and guinea-pig ileum tests, but exhibited nonopioid activity in the mouse abdominal constriction and acute toxicity studies. Jumping in mice, precipitated by naloxone, suggests the following order for liability to produce physical dependence after repeated administration: morphine greater than codeine greater than propoxyphene greater than norpropoxyphene approximately saline. Propoxyphene and norpropoxyphene depressed axonal conduction in isolated peripheral nerve and were comparable in potency to standard local anesthetic agents. The nonopioid actions of norpropoxyphene might be due in part to its local anesthetic properties. | [
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PMID:13201 | Reduction of tertiary amine N-oxides by rat liver mitochondria. | Reduction of tertiary amine N-oxides by the mitochondrial fraction of rat liver was investigated. NADPH was required as a cofactor. The rate of reaction was faster with the NADPH-generating system than with NADPH. Isocitrate in the NADPH-generating system revealed the maximum stimulation. A little less activity was observed when NADH was used as a cofactor instead of NADPH. The reductase activity was markedly inhibited under aerobic conditions. The rates of mitochondrial tertiary amine N-oxide reduction expressed in nanomoles per milligram of protein per minute were: N,N-dimethylaniline N-oxide, 4.3; tiaramide N-oxide, 0.47; and imipramine N-oxide, 0.14. The activity for N,N-dimethylaniline N-oxide was comparable to the microsomal activity, but the activity for imipramine N-oxide was much less than that in microsomes. Isocitrate and alpha-ketoglutarate were found to stimulate mitochondrial tertiary amine N-oxide reduction more efficiently than other Krebs cycle intermediates. Oxalacetate, on the other hand, was the least effective intermediate. ATP together with NADPH and NADP stimulated the reaction efficiently, probably due to the energy-dependent intramitochondrial transhydrogenation. Antimycin, rotenone and cyanide had little or no effect on isocitrate-dependent N-oxide reduction, whereas an inhibitory effect was observed on succinate-supported N-oxide reductase. N-oxide reductase activity in mitochondria was partially suppressed under an atmosphere of carbon monoxide, althouth no increase of the activity was observed by phenobarbital pretreatment, nor inhibition by 2,4-dichloro-6-phenylphenoxyethylamine. Experiments with digitonin-treated mitochondria demonstrated that mitochondrial N-oxide reductase was bound to mitochondrial inner membrane or its matrix. | Reduction of tertiary amine N-oxides by rat liver mitochondria. Reduction of tertiary amine N-oxides by the mitochondrial fraction of rat liver was investigated. NADPH was required as a cofactor. The rate of reaction was faster with the NADPH-generating system than with NADPH. Isocitrate in the NADPH-generating system revealed the maximum stimulation. A little less activity was observed when NADH was used as a cofactor instead of NADPH. The reductase activity was markedly inhibited under aerobic conditions. The rates of mitochondrial tertiary amine N-oxide reduction expressed in nanomoles per milligram of protein per minute were: N,N-dimethylaniline N-oxide, 4.3; tiaramide N-oxide, 0.47; and imipramine N-oxide, 0.14. The activity for N,N-dimethylaniline N-oxide was comparable to the microsomal activity, but the activity for imipramine N-oxide was much less than that in microsomes. Isocitrate and alpha-ketoglutarate were found to stimulate mitochondrial tertiary amine N-oxide reduction more efficiently than other Krebs cycle intermediates. Oxalacetate, on the other hand, was the least effective intermediate. ATP together with NADPH and NADP stimulated the reaction efficiently, probably due to the energy-dependent intramitochondrial transhydrogenation. Antimycin, rotenone and cyanide had little or no effect on isocitrate-dependent N-oxide reduction, whereas an inhibitory effect was observed on succinate-supported N-oxide reductase. N-oxide reductase activity in mitochondria was partially suppressed under an atmosphere of carbon monoxide, althouth no increase of the activity was observed by phenobarbital pretreatment, nor inhibition by 2,4-dichloro-6-phenylphenoxyethylamine. Experiments with digitonin-treated mitochondria demonstrated that mitochondrial N-oxide reductase was bound to mitochondrial inner membrane or its matrix. | [
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PMID:13202 | In vitro inhibition of rho-aminohippurate transport by halogenated anesthetics. | The effects of four commonly used halogenated anesthetic agents (methoxyflurane, halothane, enflurane and fluroxene) on rho-aminohippurate (PAH) uptake by rabbit renal cortical slices were examined. All agents depressed PAH uptake in a linear dose-dependent manner after 60 minutes of incubation and the effect was reversible. When the data were normalized for anesthetic potency, all agents exhibited a parallel dose-response curve. Since these agents do not share a common metabolite, it is concluded that the depression of PAH transport is mediated primarily by a direct effect of the agents acting through a common pathway. Exposure of kidney slices to perithreshold concentrations of halothane and enflurane for 180 minutes did not result in a cumulative inhibitory effect on PAH transport. A slight time-dependent effect was seen with methoxyflurane. It is suggested that with prolonged exposure metabolic conversion of methoxyflurane may occur leading to further inhibition of PAH uptake. | In vitro inhibition of rho-aminohippurate transport by halogenated anesthetics. The effects of four commonly used halogenated anesthetic agents (methoxyflurane, halothane, enflurane and fluroxene) on rho-aminohippurate (PAH) uptake by rabbit renal cortical slices were examined. All agents depressed PAH uptake in a linear dose-dependent manner after 60 minutes of incubation and the effect was reversible. When the data were normalized for anesthetic potency, all agents exhibited a parallel dose-response curve. Since these agents do not share a common metabolite, it is concluded that the depression of PAH transport is mediated primarily by a direct effect of the agents acting through a common pathway. Exposure of kidney slices to perithreshold concentrations of halothane and enflurane for 180 minutes did not result in a cumulative inhibitory effect on PAH transport. A slight time-dependent effect was seen with methoxyflurane. It is suggested that with prolonged exposure metabolic conversion of methoxyflurane may occur leading to further inhibition of PAH uptake. | [
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