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PMID:17495
A radioimmunoassay for the R-type binders of cobalamin.
A radioimmunoassay of R-type binders of cobalmin was devised and tested. The assay incorporated an antibody against purified human salivary R binder as the binding reagent. The labeled ligand was cyano[57Co]cobalamin bound to the R binder of pooled human saliva. The standard source of unlabeled ligand was also from human saliva of known R binder content. The assay was responsive to R binders of several sources, to either pure R or that of crude sources and equally to R binder saturated or unsaturated with cobalamin. It was not responsive to transcobalamin II. The assay was reproducible and reliable.
A radioimmunoassay for the R-type binders of cobalamin. A radioimmunoassay of R-type binders of cobalmin was devised and tested. The assay incorporated an antibody against purified human salivary R binder as the binding reagent. The labeled ligand was cyano[57Co]cobalamin bound to the R binder of pooled human saliva. The standard source of unlabeled ligand was also from human saliva of known R binder content. The assay was responsive to R binders of several sources, to either pure R or that of crude sources and equally to R binder saturated or unsaturated with cobalamin. It was not responsive to transcobalamin II. The assay was reproducible and reliable.
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PMID:17496
An improved method for the determination of acetylcholinesterase activity in rectal biopsy tissue from patients with Hirschsprung's disease.
A method is described for the assay of acetylcholinesterase in tissue samples using the selective cholinesterase inhibitor, lysivane (10-(alpha-diethylaminopropyl) phenothiazine hydrochloride). Significantly increased enzyme activity is found in rectal biopsy specimens from patients with Hirschsprung's disease (p less than 0.001) indicating the diagnostic usefulness of the assay.
An improved method for the determination of acetylcholinesterase activity in rectal biopsy tissue from patients with Hirschsprung's disease. A method is described for the assay of acetylcholinesterase in tissue samples using the selective cholinesterase inhibitor, lysivane (10-(alpha-diethylaminopropyl) phenothiazine hydrochloride). Significantly increased enzyme activity is found in rectal biopsy specimens from patients with Hirschsprung's disease (p less than 0.001) indicating the diagnostic usefulness of the assay.
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PMID:17497
Respiratory acidosis and alkalosis.
The physiology of respiratory control of acid-base balance is reviewed. The pathophysiological mechanisms during hypercapnia and hypocapnia are discussed in the light of the causes and clinical manifestations of these disturbances. In addition to the role of the kidney in the compensatory processes of these disturbances, renal functional changes during acute and chronic pulmonary acid-base derangement is discussed. Some of the difficulties encountered in the patient with chronic renal disease in whom respiratory abnormalities may be present are also discussed.
Respiratory acidosis and alkalosis. The physiology of respiratory control of acid-base balance is reviewed. The pathophysiological mechanisms during hypercapnia and hypocapnia are discussed in the light of the causes and clinical manifestations of these disturbances. In addition to the role of the kidney in the compensatory processes of these disturbances, renal functional changes during acute and chronic pulmonary acid-base derangement is discussed. Some of the difficulties encountered in the patient with chronic renal disease in whom respiratory abnormalities may be present are also discussed.
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PMID:17498
Metabolic acidosis and alkalosis.
The factors controlling renal bicarbonate reabsorption and acid excretion under normal conditions and in the presence of metabolic acidosis and alkalosis are reviewed. The methods used to assess distal acidification and its limitations are also discussed. Measurement of urinary pCO2 in maximally alkaline urine (pH greater than 7.8) is a very useful qualitative method to assess distal acidification. The finding of a low urinary pCO2 in maximally alkaline urine indicates a distal acidification defect. We propose that both the secretory and gradient defect types of distal renal tubular acidosis are associated with a low urinary pCO2 when the urine is maximally alkaline. Sodium sulfate and neutral phosphate infusion may allow distinction between a secretory and gradient defect. Sodium sulfate lowers urine pH in the gradient defect but fails to produce the same response in the secretory defect. Neutral phosphate infusion when urine pH (6.8-7.4) is close to the pK of phosphate (6.8) results in an increase in urinary pCO2 in the gradient defect but not in the secretory defect. The mechanisms of generation, maintenance and treatment of metabolic alkalosis are also discussed.
Metabolic acidosis and alkalosis. The factors controlling renal bicarbonate reabsorption and acid excretion under normal conditions and in the presence of metabolic acidosis and alkalosis are reviewed. The methods used to assess distal acidification and its limitations are also discussed. Measurement of urinary pCO2 in maximally alkaline urine (pH greater than 7.8) is a very useful qualitative method to assess distal acidification. The finding of a low urinary pCO2 in maximally alkaline urine indicates a distal acidification defect. We propose that both the secretory and gradient defect types of distal renal tubular acidosis are associated with a low urinary pCO2 when the urine is maximally alkaline. Sodium sulfate and neutral phosphate infusion may allow distinction between a secretory and gradient defect. Sodium sulfate lowers urine pH in the gradient defect but fails to produce the same response in the secretory defect. Neutral phosphate infusion when urine pH (6.8-7.4) is close to the pK of phosphate (6.8) results in an increase in urinary pCO2 in the gradient defect but not in the secretory defect. The mechanisms of generation, maintenance and treatment of metabolic alkalosis are also discussed.
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PMID:17500
Methadone maintenance: effect of urinary pH on renal clearance in chronic high and low doses.
The subjects were 12 male patients stabilized on methadone for many months or years. A comparison was made of the plasma levels and renal clearance of methadone between patients on "high" doses (80 to 110 mg/day) and those on "low" doses (15 to 40 mg/day). A general trend to higher renal clearance was seen in the "high" -dose group, but on more detailed examination there was a direct correlation only when the patients were categorized by urinary pH. At low pHs, there was nearly a 3-fold increase in renal clearance which was associated with a decreased major metabolite to methadone ratio. No evidence for a difference in rate of metabolism between the two groups was found nor were there differences in hepatic function. It was concluded that urinary pH was a major factor in renal clearance of methadone.
Methadone maintenance: effect of urinary pH on renal clearance in chronic high and low doses. The subjects were 12 male patients stabilized on methadone for many months or years. A comparison was made of the plasma levels and renal clearance of methadone between patients on "high" doses (80 to 110 mg/day) and those on "low" doses (15 to 40 mg/day). A general trend to higher renal clearance was seen in the "high" -dose group, but on more detailed examination there was a direct correlation only when the patients were categorized by urinary pH. At low pHs, there was nearly a 3-fold increase in renal clearance which was associated with a decreased major metabolite to methadone ratio. No evidence for a difference in rate of metabolism between the two groups was found nor were there differences in hepatic function. It was concluded that urinary pH was a major factor in renal clearance of methadone.
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PMID:17501
The crystalline salts of calcium bilirubinate in human gallstones.
1. The acid, neutral and "intermediate" salts of calcium bilirubinate have been synthesized. 2. All are crystalline, and the intermediate salt which has 1 1/2 molecules of bilirubin per calcium atom probably has a crystal structure containing molecules of both acid and neutral salts. 3. The acid or intermediate salts have been found in 14 out of 70 gallstones analysed recently by X-ray diffraction.
The crystalline salts of calcium bilirubinate in human gallstones. 1. The acid, neutral and "intermediate" salts of calcium bilirubinate have been synthesized. 2. All are crystalline, and the intermediate salt which has 1 1/2 molecules of bilirubin per calcium atom probably has a crystal structure containing molecules of both acid and neutral salts. 3. The acid or intermediate salts have been found in 14 out of 70 gallstones analysed recently by X-ray diffraction.
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PMID:17512
Autoimmunity, oncornaviruses, and lymphomagenesis.
The interactions between aberrant immune responses and C-type oncornaviruses in mice are complex. These viruses may be activated during certain immune responses, e.g., histocompatibility reactions, in the face of chronic immunosuppression. Oncornaviruses, themselves, may induce autoaggressive cell-mediated responses in certain lymphoid subpopulations, and these autoimmune reactions may be important in subsequent lymphomagenesis. Parallel events may occur in other animal models, e.g., the NZB mouse, and in certain human disorders, e.g., Sjögren's syndrome, systemic lupus erythematosus, and myasthenia gravis.
Autoimmunity, oncornaviruses, and lymphomagenesis. The interactions between aberrant immune responses and C-type oncornaviruses in mice are complex. These viruses may be activated during certain immune responses, e.g., histocompatibility reactions, in the face of chronic immunosuppression. Oncornaviruses, themselves, may induce autoaggressive cell-mediated responses in certain lymphoid subpopulations, and these autoimmune reactions may be important in subsequent lymphomagenesis. Parallel events may occur in other animal models, e.g., the NZB mouse, and in certain human disorders, e.g., Sjögren's syndrome, systemic lupus erythematosus, and myasthenia gravis.
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PMID:17513
Predictability of arterial pH and PCO2 from right atrial blood samples in experimental animal.
Arterial and right atrial blood samples were drawn simultaneously under acutely changing acid-base and ventilatory conditions in a series of experiments carried out in nine pigs. The pH, PCO2, bicarbonate concentration and base excess from arterial and right atrial blood are compared. The predictability of the arterial values from the right atrial values is discussed. It is concluded that right atrial blood samples are approximately as informative as arterial blood samples for determining the acid-base status under both normal and acutely changed acid-base and ventilatory conditions.
Predictability of arterial pH and PCO2 from right atrial blood samples in experimental animal. Arterial and right atrial blood samples were drawn simultaneously under acutely changing acid-base and ventilatory conditions in a series of experiments carried out in nine pigs. The pH, PCO2, bicarbonate concentration and base excess from arterial and right atrial blood are compared. The predictability of the arterial values from the right atrial values is discussed. It is concluded that right atrial blood samples are approximately as informative as arterial blood samples for determining the acid-base status under both normal and acutely changed acid-base and ventilatory conditions.
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PMID:17516
Fiberoptic bronchoscopy and culture bacteria from the lower respiratory.
Forty-five specimens were obtained by sequential translaryngeal aspiration and fiberoptic bronchoscopy from 31 clinically unifected patients with lung cancer in order to evaluate the reliability of routine fiberoptic bronchoscopy for culture of the lower respiratory tract. Bacteria were recovered brom 98 percent (44) of the specimens obtained via fiberoptic bronchoscopy and from 58 percent (26) of the specimens obtained by the preceding translaryngeal aspiration. The microorganisms grown from cultures of specimens obtained by fiberoptic bronchoscopy consisted of mixtures of both nonpathogenic and potenitally pathogenic bacteria. Potentially pathogenic bacteria were present in 87 percent (39) of the specimens from fiberoptic bronchoscopy and 31 percent (14) of specimens from translayngeal aspiration. The results of cultures from the two procedures agreed completely in only a single instance. Culture of washings or secretions obtained by routine fiberoptic bronchoscopy is not recommended because it provides inaccurate and clinically confusing information about the presence or types of bacteria in the lower respiratory tract prior to instrumentation.
Fiberoptic bronchoscopy and culture bacteria from the lower respiratory. Forty-five specimens were obtained by sequential translaryngeal aspiration and fiberoptic bronchoscopy from 31 clinically unifected patients with lung cancer in order to evaluate the reliability of routine fiberoptic bronchoscopy for culture of the lower respiratory tract. Bacteria were recovered brom 98 percent (44) of the specimens obtained via fiberoptic bronchoscopy and from 58 percent (26) of the specimens obtained by the preceding translaryngeal aspiration. The microorganisms grown from cultures of specimens obtained by fiberoptic bronchoscopy consisted of mixtures of both nonpathogenic and potenitally pathogenic bacteria. Potentially pathogenic bacteria were present in 87 percent (39) of the specimens from fiberoptic bronchoscopy and 31 percent (14) of specimens from translayngeal aspiration. The results of cultures from the two procedures agreed completely in only a single instance. Culture of washings or secretions obtained by routine fiberoptic bronchoscopy is not recommended because it provides inaccurate and clinically confusing information about the presence or types of bacteria in the lower respiratory tract prior to instrumentation.
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PMID:17517
Patterns of antipsychotic drug use in four Southeastern state hospitals.
The drug prescriptions of patients in the four mental hospitals of a state were obtained as of a specific date and subjected to various analyses. The results disclose a high frequency of antiparkinson drug orders (41.5% of the patients), their relationship to polypharmacy (30% of the antipsychotic drug prescriptions were for two or more to be administered simultaneously), the direct relationship between the antipsychotic dose level and antiparkinson drug and PRN orders and the incidence of multiple dose schedules (75%). Also other prescription practices which have received little or no attention are described and discussed.
Patterns of antipsychotic drug use in four Southeastern state hospitals. The drug prescriptions of patients in the four mental hospitals of a state were obtained as of a specific date and subjected to various analyses. The results disclose a high frequency of antiparkinson drug orders (41.5% of the patients), their relationship to polypharmacy (30% of the antipsychotic drug prescriptions were for two or more to be administered simultaneously), the direct relationship between the antipsychotic dose level and antiparkinson drug and PRN orders and the incidence of multiple dose schedules (75%). Also other prescription practices which have received little or no attention are described and discussed.
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PMID:17514
The ventilatory response in uncomplicated diabetic ketoacidosis.
The ventilatory response to uncomplicated sub-acute metabolic acidosis was studied by measuring arterial blood CO2 tension (PaCO2) and pH in 27 episodes of diabetic ketoacidosis without coexisting lactic acidosis. From those data, regression equations and 95% confidence bands were calculated for the relations between PaCO2 and pH. These relations were very similar to those previously described by others in patients with chronic uremic acidosis.
The ventilatory response in uncomplicated diabetic ketoacidosis. The ventilatory response to uncomplicated sub-acute metabolic acidosis was studied by measuring arterial blood CO2 tension (PaCO2) and pH in 27 episodes of diabetic ketoacidosis without coexisting lactic acidosis. From those data, regression equations and 95% confidence bands were calculated for the relations between PaCO2 and pH. These relations were very similar to those previously described by others in patients with chronic uremic acidosis.
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PMID:17520
Isolation and identification of the major metabolite of albuterol in human urine.
The major urinary metabolite of albuterol in man was isolated and purified by ion-exchange chromatography and countercurrent distribution. On the basis of proton magnetic resonance, infrared, and mass-spectral analysis, enzymic hydrolysis, and assay of inorganic sulfate after acid hydrolysis, the metabolite has been identified as the 4'-O-sulfate ester of albuterol.
Isolation and identification of the major metabolite of albuterol in human urine. The major urinary metabolite of albuterol in man was isolated and purified by ion-exchange chromatography and countercurrent distribution. On the basis of proton magnetic resonance, infrared, and mass-spectral analysis, enzymic hydrolysis, and assay of inorganic sulfate after acid hydrolysis, the metabolite has been identified as the 4'-O-sulfate ester of albuterol.
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PMID:17523
Pharmacokinetics of intravenously injected chloramphenicol in baby pigs.
A sensitive fluorometric assay procedure for chloramphenicol and its metabolites was used to measure distribution in tissues and elimination of the drug after injection of 22 mg/kg iv in baby pigs. Disappearance of chloramphenicol from plasma was biphasic; an initial component was rapid (half-life about 9 min) and a second component had a half-life of 55 min. The total chloramphenicol levels in tissues and body fluids had half-life periods of 1-1.5 hr and dropped below limits of detectability within 9 hr after injection. About 80% of the injected dose was recovered from urine collected over the first 6 hr, and none thereafter. Fecal elimination, if occurring, was negligible.
Pharmacokinetics of intravenously injected chloramphenicol in baby pigs. A sensitive fluorometric assay procedure for chloramphenicol and its metabolites was used to measure distribution in tissues and elimination of the drug after injection of 22 mg/kg iv in baby pigs. Disappearance of chloramphenicol from plasma was biphasic; an initial component was rapid (half-life about 9 min) and a second component had a half-life of 55 min. The total chloramphenicol levels in tissues and body fluids had half-life periods of 1-1.5 hr and dropped below limits of detectability within 9 hr after injection. About 80% of the injected dose was recovered from urine collected over the first 6 hr, and none thereafter. Fecal elimination, if occurring, was negligible.
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-0.03306347876787186, -0.008506572805345058, -0.033367183059453964, 0.06394616514444351, -0.05725272372364998, -0.019722439348697662, -0.0752677321434021, 0.06425011157989502, 0.01160795520991087, -0.0771079733967781, -0.008516240864992142, 0.027549343183636665, 0.024368256330490112, -0.0028093368746340275, -0.036557700484991074, 0.051756538450717926, -0.03145734220743179, -0.009956561028957367, -0.005622387398034334, -0.0334920808672905, -0.02378341741859913, 0.023382648825645447, 0.06367286294698715, -0.009228073060512543 ]
PMID:17524
Biotransformation of cannabidiol in mice. Identification of new acid metabolites.
The in vivo metabolism of cannabidiol (CBD) was investigated in mice. Following the ip administration of CBD to mice, livers were removed and metabolites were extracted with ethyl acetate prior to partial purification on Sephadex LH-20 columns. Fractions from the columns were converted into trimethylsilyl, d9-trimethylsilyl, and methylester-trimethylsilyl derivatives for analysis by gas-liquid chromatography-mass spectrometry. In addition, metabolites containing carboxylic acid and ketone functional groups were reduced to alcohols with lithium aluminum deuteride before trimethylsilation. A total of 22 metabolites were characterized, 14 of which had not been reported previously. The metabolites could be categorized as follows: monohydroxylated (N=2), dihydroxylated (N=3), CBD-7-oic acid, side chain hydroxy-GBD-7-oic acids (N=3), side-chain acids (N=3), 7-hydroxy-side-chain acids (N=4), 6-oxo-side-chain acids (N=3) and glucuronide conjugates (N=3). The most significant biotransformations were glucuronide conjugation and, to a lesser extent, formation of CBD-7-oic acid.
Biotransformation of cannabidiol in mice. Identification of new acid metabolites. The in vivo metabolism of cannabidiol (CBD) was investigated in mice. Following the ip administration of CBD to mice, livers were removed and metabolites were extracted with ethyl acetate prior to partial purification on Sephadex LH-20 columns. Fractions from the columns were converted into trimethylsilyl, d9-trimethylsilyl, and methylester-trimethylsilyl derivatives for analysis by gas-liquid chromatography-mass spectrometry. In addition, metabolites containing carboxylic acid and ketone functional groups were reduced to alcohols with lithium aluminum deuteride before trimethylsilation. A total of 22 metabolites were characterized, 14 of which had not been reported previously. The metabolites could be categorized as follows: monohydroxylated (N=2), dihydroxylated (N=3), CBD-7-oic acid, side chain hydroxy-GBD-7-oic acids (N=3), side-chain acids (N=3), 7-hydroxy-side-chain acids (N=4), 6-oxo-side-chain acids (N=3) and glucuronide conjugates (N=3). The most significant biotransformations were glucuronide conjugation and, to a lesser extent, formation of CBD-7-oic acid.
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PMID:17521
Absorption, excretion and disposition of cyclindole in laboratory animals and human volunteers.
Radioactivity from orally administered single doses of cyclindole-14C was excreted primarily in the urine of the rat (99%/48 hr), monkey (80%/120 hr), and dog (70%/144 hr). Approximately 38-58% of a daily dose of cyclindole was recovered from 24-hr human urine, as determined by gas chromatography. Substantial amounts of unchanged drug were voided by dogs. Cyclindole was metabolized primarily by N-demethylation and/or hydroxylation in the 7-position. Hydroxylation at the 6-carbon atom was of minor importance in humans only; none of the animal species excreted the 6-hydroxy metabolite. Dogs were capable of N-demethylation, but no metabolites oxidized at the 6- or 7-carbon atoms were detected in dog urine.
Absorption, excretion and disposition of cyclindole in laboratory animals and human volunteers. Radioactivity from orally administered single doses of cyclindole-14C was excreted primarily in the urine of the rat (99%/48 hr), monkey (80%/120 hr), and dog (70%/144 hr). Approximately 38-58% of a daily dose of cyclindole was recovered from 24-hr human urine, as determined by gas chromatography. Substantial amounts of unchanged drug were voided by dogs. Cyclindole was metabolized primarily by N-demethylation and/or hydroxylation in the 7-position. Hydroxylation at the 6-carbon atom was of minor importance in humans only; none of the animal species excreted the 6-hydroxy metabolite. Dogs were capable of N-demethylation, but no metabolites oxidized at the 6- or 7-carbon atoms were detected in dog urine.
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PMID:17525
The effects of delta9-tetrahydrocannabinol and cannabidiol on the metabolism of gonadal steroids in the rat.
The effects of delta9-tetrahydrocannabinol (THC) and cannabidiol (CBD) on hydroxylation of estradiol and testosterone in rat liver microsomes were investigated. Acute and chronic treatment of male and female rats with either cannabinoid, 2 or 10 mg/kg, significantly elevated steroid hydroxylase activity. Acute administration of THC or CBD, 10 mg/kg, evoked no detectable changes in cytochrome P-450 levels, but a significant decrease in those of cytochrome b5. Chronic administration of THC or CBD, 2 mg/kg, decreased levels of cytochrome P-450, whereas cytochrome b5 levels appeared normal. Acute doses of THC or CBD at 10 mg/kg significantly depressed testosterone formation in testis microsomes. Chronic THC, 2 mg/kg, but not CBD, evoked the most dramatic decrease in testicular enzyme activity.
The effects of delta9-tetrahydrocannabinol and cannabidiol on the metabolism of gonadal steroids in the rat. The effects of delta9-tetrahydrocannabinol (THC) and cannabidiol (CBD) on hydroxylation of estradiol and testosterone in rat liver microsomes were investigated. Acute and chronic treatment of male and female rats with either cannabinoid, 2 or 10 mg/kg, significantly elevated steroid hydroxylase activity. Acute administration of THC or CBD, 10 mg/kg, evoked no detectable changes in cytochrome P-450 levels, but a significant decrease in those of cytochrome b5. Chronic administration of THC or CBD, 2 mg/kg, decreased levels of cytochrome P-450, whereas cytochrome b5 levels appeared normal. Acute doses of THC or CBD at 10 mg/kg significantly depressed testosterone formation in testis microsomes. Chronic THC, 2 mg/kg, but not CBD, evoked the most dramatic decrease in testicular enzyme activity.
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PMID:17527
Glucuronidation and deglucuronidation reactions in hepatic and extrahepatic tissues during perinatal development.
The relative activities of uridine diphosphoglucuronyltransferase (UDPGT) and beta-glucuronidase (betaG) were measured during perinatal development of hepatic and extrahepatic tissues to determine the balance between glucuronidation and deglucuronidation reactions at different developmental stages. Liver, lung, kidney, intestine, and placenta were studied in guinea pigs and rabbits. In general, betaG activities exceeded those of UDPGT in fetal tissues, whereas the converse was evident in adults. There were significant species and age differences in the onset of betaG and UDPGT activities and the occurrence of developmental peaks. A dramatic betaG developmental peak was observed in fetal guinea pig intestine and newborn rabbit intestine. Both microsomal and lysosomal betaG exhibited similar developmental patterns in all tissues tested. Hepatic nonsteroid UDPGT activities were higher at parturition than in adult animals, whereas no such developmental peak occurred for steroid UDPGT. Triton X-100 activated fetal UDPGT in vitro by approximately the same factor as it did for adult UDPGT.
Glucuronidation and deglucuronidation reactions in hepatic and extrahepatic tissues during perinatal development. The relative activities of uridine diphosphoglucuronyltransferase (UDPGT) and beta-glucuronidase (betaG) were measured during perinatal development of hepatic and extrahepatic tissues to determine the balance between glucuronidation and deglucuronidation reactions at different developmental stages. Liver, lung, kidney, intestine, and placenta were studied in guinea pigs and rabbits. In general, betaG activities exceeded those of UDPGT in fetal tissues, whereas the converse was evident in adults. There were significant species and age differences in the onset of betaG and UDPGT activities and the occurrence of developmental peaks. A dramatic betaG developmental peak was observed in fetal guinea pig intestine and newborn rabbit intestine. Both microsomal and lysosomal betaG exhibited similar developmental patterns in all tissues tested. Hepatic nonsteroid UDPGT activities were higher at parturition than in adult animals, whereas no such developmental peak occurred for steroid UDPGT. Triton X-100 activated fetal UDPGT in vitro by approximately the same factor as it did for adult UDPGT.
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PMID:17529
Metabolism of 7,12-dimethylbenz[a]anthracene in mouse skin homogenates analyzed with high-pressure liquid chromatography.
The metabolism of 7,12-dimethylbenz[a]anthracene (DMBA) in epidermal homogenates from 3-methylcholanthrene-pretreated mice was analyzed with high-pressure liquid chromatography. Metabolism was undetectable in the absence of pretreatment. Specific activities in epidermal homogenates from pretreated mice were found to be approximately 100 to 1000 times lower than those observed in comparable incubations containing hepatic microsomes from MC-pretreated rats. The major metabolite formed was identified as 7-hydroxymethyl-12-methylbenz[a]anthracene. Each of the known hydroxymethyl metabolites also was present in detectable quantities. The K-region diol was not measurably present in incubations with mouse skin homogenates or rat liver microsomes from MC-pretreated animals. 7,8-Benzoflavone, 5,6-benzoflavone, and 17-beta-estradiol were found to be potent inhibitors of the metabolic transformation of DMBA by epidermal homogenates in vitro, whereas butylated hydroxytoluene and 1,1,1-trichloro-2,3-propene oxide had little effect on or enhanced metabolite formation from DMBA in vitro.
Metabolism of 7,12-dimethylbenz[a]anthracene in mouse skin homogenates analyzed with high-pressure liquid chromatography. The metabolism of 7,12-dimethylbenz[a]anthracene (DMBA) in epidermal homogenates from 3-methylcholanthrene-pretreated mice was analyzed with high-pressure liquid chromatography. Metabolism was undetectable in the absence of pretreatment. Specific activities in epidermal homogenates from pretreated mice were found to be approximately 100 to 1000 times lower than those observed in comparable incubations containing hepatic microsomes from MC-pretreated rats. The major metabolite formed was identified as 7-hydroxymethyl-12-methylbenz[a]anthracene. Each of the known hydroxymethyl metabolites also was present in detectable quantities. The K-region diol was not measurably present in incubations with mouse skin homogenates or rat liver microsomes from MC-pretreated animals. 7,8-Benzoflavone, 5,6-benzoflavone, and 17-beta-estradiol were found to be potent inhibitors of the metabolic transformation of DMBA by epidermal homogenates in vitro, whereas butylated hydroxytoluene and 1,1,1-trichloro-2,3-propene oxide had little effect on or enhanced metabolite formation from DMBA in vitro.
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PMID:17534
[Splenic infarcts in Goodpasture's syndrome: its significance for diagnosis, prognosis, and treatment (author's transl)].
Necrotising splenic arteritis with numerous extensive anaemic splenic infarcts was found in four cases of Goodpasture's syndrome with the necrotising variant of rapidly progressive glomerulonephritis. The disease was rapidly fatal. Early scanning of splenic infarcts for diagnostic, prognostic and therapeutic purposes of the fulminating form of Goodpasture's syndrome is recommended.
[Splenic infarcts in Goodpasture's syndrome: its significance for diagnosis, prognosis, and treatment (author's transl)]. Necrotising splenic arteritis with numerous extensive anaemic splenic infarcts was found in four cases of Goodpasture's syndrome with the necrotising variant of rapidly progressive glomerulonephritis. The disease was rapidly fatal. Early scanning of splenic infarcts for diagnostic, prognostic and therapeutic purposes of the fulminating form of Goodpasture's syndrome is recommended.
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PMID:17531
Microsomal N-hydroxylation of trans-4'-halo-4-acetamidostilbenes.
Hamster liver microsomes catalyze the N-hydroxylation of trans-4-acetamidostilbene and its 4'-Cl and 4'-F analogs. Other metabolites which were detected and quantitated were the 4'-OH derivative of trans-4-acetamidostilbene and the glycolamides of the 4'-Cl and 4'-F compounds. The kinetics of metabolism of the acetamidostilbenes were also determined. The apparent KM values of N-hydroxylation of the four substrates were similar, but the maximal velocities showed marked variations. The Vmax for the 4'-Br analog was 16% of that of trans-4-acetamidostilbene, and the rate of N-hydroxylation of the 4'Cl and 4'-F analogs was only 3% of that of the parent compound.
Microsomal N-hydroxylation of trans-4'-halo-4-acetamidostilbenes. Hamster liver microsomes catalyze the N-hydroxylation of trans-4-acetamidostilbene and its 4'-Cl and 4'-F analogs. Other metabolites which were detected and quantitated were the 4'-OH derivative of trans-4-acetamidostilbene and the glycolamides of the 4'-Cl and 4'-F compounds. The kinetics of metabolism of the acetamidostilbenes were also determined. The apparent KM values of N-hydroxylation of the four substrates were similar, but the maximal velocities showed marked variations. The Vmax for the 4'-Br analog was 16% of that of trans-4-acetamidostilbene, and the rate of N-hydroxylation of the 4'Cl and 4'-F analogs was only 3% of that of the parent compound.
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PMID:17536
[Stimulation of H+ secretion and serum gastrin by intra-operative electrical vagal stimulation before and after proximal selective vagotomy (author's transl)].
H+ secretion and gastrin concentration were measured before and after electric vagal stimulation during proximal selective vagotomy in 29 patients with duodenal ulcers. Before vagotomy, H+ secretion and serum gastrin concentration significantly rose after stimulation, while after complete vagotomy H+ secretion remained below basal values, although serum gastrin concentration was significantly increased. These results indicate that without vagal innervation there is no gastrin secretion within physiological levels. The method is suitable for testing the completeness of the vagotomy, the results not agreeing with those obtained by pressure measurements (Burge's method).
[Stimulation of H+ secretion and serum gastrin by intra-operative electrical vagal stimulation before and after proximal selective vagotomy (author's transl)]. H+ secretion and gastrin concentration were measured before and after electric vagal stimulation during proximal selective vagotomy in 29 patients with duodenal ulcers. Before vagotomy, H+ secretion and serum gastrin concentration significantly rose after stimulation, while after complete vagotomy H+ secretion remained below basal values, although serum gastrin concentration was significantly increased. These results indicate that without vagal innervation there is no gastrin secretion within physiological levels. The method is suitable for testing the completeness of the vagotomy, the results not agreeing with those obtained by pressure measurements (Burge's method).
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PMID:17537
Hepatic enzymes, their induction and usefulness in predicting maximal serum bilirubin levels in premature newborn infants.
Sixty-seven babies were utilized to (a) document the serum bilirubin lowering effect and safety of a phenobarbitone and nikethamide combination in neonatal hyperbilirubinaemia of non-hemolytic origin; (b) determine whether birthweight and/or SGOT, SGPT or SGGT activity on day one of life correlated with the maximum serum bilirubin level achieved; and (c) investigate the pattern of hepatic enzyme levels in serum under normal conditions anf following drug induction. Results indicate a significantly lower serum bilirubin level in the treated group of babies. Birthweight and day one SGGT levels, and SGGT/birthweight ratio correlated well with the maximum serum bilirubin reached, the latter ratio being particularly useful in predicting the degree of hyperbilirubinaemia.
Hepatic enzymes, their induction and usefulness in predicting maximal serum bilirubin levels in premature newborn infants. Sixty-seven babies were utilized to (a) document the serum bilirubin lowering effect and safety of a phenobarbitone and nikethamide combination in neonatal hyperbilirubinaemia of non-hemolytic origin; (b) determine whether birthweight and/or SGOT, SGPT or SGGT activity on day one of life correlated with the maximum serum bilirubin level achieved; and (c) investigate the pattern of hepatic enzyme levels in serum under normal conditions anf following drug induction. Results indicate a significantly lower serum bilirubin level in the treated group of babies. Birthweight and day one SGGT levels, and SGGT/birthweight ratio correlated well with the maximum serum bilirubin reached, the latter ratio being particularly useful in predicting the degree of hyperbilirubinaemia.
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PMID:17538
In vitro pharmacology of the opioid peptides, enkephalins and endorphins.
In the guinea-pig ileum methionine-enkephalin, normorphine and morphine are equipotent in depressing electrically evoked contractions; leucine-enkephalin has about 25% of the activity. The mouse vas deferens is more sensitive to the enkephalins which are 30 to 60 times more potent than morphine. Fragments of beta-lipotropin61-91 (beta-endorphin) having sequences up to LPH76 are more potent in the mouse vas deferens than in the guinea-pig ileum but beta-endorphin is about equipotent in the two preparations. None of the peptides has antagonist activity. Methionine-enkephalin and normorphine are equipotent in inhibiting [3H]-naloxone binding by homogenate of guinea-pig brain in the absence of Na+ while leucine-enkephalin has only 25% of this activity. In the guinea-pig ileum, naloxone antagonises normorhine and the enkephalins equally well whereas in the mouse vas deferens about ten times more naloxone is required for the enkophalins that for normorphine. Methionine-enkephalin depresses output of acetylcholine in the guinea-pig ileum and of noradrenaline in the mouse vas deferens.
In vitro pharmacology of the opioid peptides, enkephalins and endorphins. In the guinea-pig ileum methionine-enkephalin, normorphine and morphine are equipotent in depressing electrically evoked contractions; leucine-enkephalin has about 25% of the activity. The mouse vas deferens is more sensitive to the enkephalins which are 30 to 60 times more potent than morphine. Fragments of beta-lipotropin61-91 (beta-endorphin) having sequences up to LPH76 are more potent in the mouse vas deferens than in the guinea-pig ileum but beta-endorphin is about equipotent in the two preparations. None of the peptides has antagonist activity. Methionine-enkephalin and normorphine are equipotent in inhibiting [3H]-naloxone binding by homogenate of guinea-pig brain in the absence of Na+ while leucine-enkephalin has only 25% of this activity. In the guinea-pig ileum, naloxone antagonises normorhine and the enkephalins equally well whereas in the mouse vas deferens about ten times more naloxone is required for the enkophalins that for normorphine. Methionine-enkephalin depresses output of acetylcholine in the guinea-pig ileum and of noradrenaline in the mouse vas deferens.
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PMID:17541
The role of adrenoceptors in norepinephrine-stimulated VO2 in muscle.
The purpose of this study was to characterize the norepinephrine (NE)-evoked calorigenic response of an isolated perfused rat muscle preparation into alpha-and/or beta-adrenergic components. Epinephrine was as effective as NE in evoking the increase in oxygen consumption. The alpha-agonist, phenylephrine, was also as effective as NE in eliciting an increase in oxygen consumption by the muscle. Isoproterenol (beta-agonist) had no effect on the VO2 of the preparation. Phentolamine, an alpha-blocker, completely blocked the NE-stimulated VO2. Propranolol (beta-antagonist) could also completely block the NE induced VO2 but this drug was found to be less potent. It was concluded that the NE-induced calorigenic response of muscle cannot be classified either strictly as an alpha-or beta-response, but unlike brown adipose tissue, the alpha-response seems to predominate in skeletal muscle. Also, it appears as though different mechanisms of action may be involved in the NE-stimulated VO2 in skeletal muscle and brown fat.
The role of adrenoceptors in norepinephrine-stimulated VO2 in muscle. The purpose of this study was to characterize the norepinephrine (NE)-evoked calorigenic response of an isolated perfused rat muscle preparation into alpha-and/or beta-adrenergic components. Epinephrine was as effective as NE in evoking the increase in oxygen consumption. The alpha-agonist, phenylephrine, was also as effective as NE in eliciting an increase in oxygen consumption by the muscle. Isoproterenol (beta-agonist) had no effect on the VO2 of the preparation. Phentolamine, an alpha-blocker, completely blocked the NE-stimulated VO2. Propranolol (beta-antagonist) could also completely block the NE induced VO2 but this drug was found to be less potent. It was concluded that the NE-induced calorigenic response of muscle cannot be classified either strictly as an alpha-or beta-response, but unlike brown adipose tissue, the alpha-response seems to predominate in skeletal muscle. Also, it appears as though different mechanisms of action may be involved in the NE-stimulated VO2 in skeletal muscle and brown fat.
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PMID:17544
[Effect of a schedule of administration of chlorpromazine, majeptil and trisedyl on the synthesis of proteins in different brain structures of rats].
Following a course-wise introduction of chlorpromazine, majeptil and trisedyl to rats the methionine-35S incorporation in the protein was diminished in most of the brain segments.
[Effect of a schedule of administration of chlorpromazine, majeptil and trisedyl on the synthesis of proteins in different brain structures of rats]. Following a course-wise introduction of chlorpromazine, majeptil and trisedyl to rats the methionine-35S incorporation in the protein was diminished in most of the brain segments.
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PMID:17545
[Effect of nonachlazine on the processes of uptake and release of nordrenaline].
Nonachlazine (2 micrometer) blocked significantly the uptake 1 of endogenic noradrenaline in the myocardial tissues and in adrenergic neurons of vas deferens. The uptake II, as well as the intensity and dynamics of the noradrenaline release were not affected by nonachlazine. These processes resulted in an increase of free noradrenaline concentrations in the synaptic space. The latter seems to be a result of the mediator's passage into the nerve fibers (through axonal membranes) and into the granule, this being due to the nonachlazine-induced block. It is suggested that the metabolic and functional nonachlazine effects are related to the beta-adrenergic receptors stimulation, mediated through the agency of noradrenaline.
[Effect of nonachlazine on the processes of uptake and release of nordrenaline]. Nonachlazine (2 micrometer) blocked significantly the uptake 1 of endogenic noradrenaline in the myocardial tissues and in adrenergic neurons of vas deferens. The uptake II, as well as the intensity and dynamics of the noradrenaline release were not affected by nonachlazine. These processes resulted in an increase of free noradrenaline concentrations in the synaptic space. The latter seems to be a result of the mediator's passage into the nerve fibers (through axonal membranes) and into the granule, this being due to the nonachlazine-induced block. It is suggested that the metabolic and functional nonachlazine effects are related to the beta-adrenergic receptors stimulation, mediated through the agency of noradrenaline.
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PMID:17547
[Stabilization of biological membranes with various acetylene amines].
In experiments with mitochondrial membranes and membranes of the endoplasmatic reticulum of the rats' liver the membrane-stabilizing action of a number of unsaturated amines was evaluated. The acetylene compounds studied reduced the extent of the membranes damage following UV-irradiation, treatment with detergents and their incubation in a hypoosmotic medium. Such an action displayed gutimine and sovcaine. Hydrated compounds, analogues of acetylene amines are devoid of the ability to raise the resistance of the cellular organoids membranes to damaging factors
[Stabilization of biological membranes with various acetylene amines]. In experiments with mitochondrial membranes and membranes of the endoplasmatic reticulum of the rats' liver the membrane-stabilizing action of a number of unsaturated amines was evaluated. The acetylene compounds studied reduced the extent of the membranes damage following UV-irradiation, treatment with detergents and their incubation in a hypoosmotic medium. Such an action displayed gutimine and sovcaine. Hydrated compounds, analogues of acetylene amines are devoid of the ability to raise the resistance of the cellular organoids membranes to damaging factors
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PMID:17546
[Study of the induction of thrombocyte adhesiveness in the presence of heparin].
An investigation of the thrombocytes adhesion after Hellem (1960) showed that "in vitro" tests norepinephrine, epinephrine, histamine, serotonin and adenosine-diphosphate, when used in doses of 100-25,0 gamma/ml, were capable of raising the thrombocytes adhesion, while heparin administered in doses of 0.5-0.05 U/ml depressed and in a dose of 0.025 U/ml mildly activated this capacity of the thrombocytes. In the presence of heparin the ability of biogenic amines to induce the adhesion of thrombocytes decreased. Between concentration of the agents and the adhesive index of thrombocytes there exists a two-way logarithmic relationship. Intravenous administration of serotonin in a dose of 5 mg/kg and of epinephrine in an amount of 0.05 mg/kg to rabbits increased the adhesivity of thrombocytes, whereas intravenous introduction of 100 un/kg of heparin tended to greatly reduce it. On introduction of serotonin and epinephrine to rabbits against the background of heparin their ability to activate the thrombocytes adhesion diminished quite significantly. The logarithm of time lapsed from the instance of the heparin administration is linearly dependent on the logarithms of values characterizing the adhesivity of thrombocytes. Intravenous administration of norepinephrine and histamine in a dose of 0.5 mg/kg did not cause any changes in the adhesive properties of thrombocytes.
[Study of the induction of thrombocyte adhesiveness in the presence of heparin]. An investigation of the thrombocytes adhesion after Hellem (1960) showed that "in vitro" tests norepinephrine, epinephrine, histamine, serotonin and adenosine-diphosphate, when used in doses of 100-25,0 gamma/ml, were capable of raising the thrombocytes adhesion, while heparin administered in doses of 0.5-0.05 U/ml depressed and in a dose of 0.025 U/ml mildly activated this capacity of the thrombocytes. In the presence of heparin the ability of biogenic amines to induce the adhesion of thrombocytes decreased. Between concentration of the agents and the adhesive index of thrombocytes there exists a two-way logarithmic relationship. Intravenous administration of serotonin in a dose of 5 mg/kg and of epinephrine in an amount of 0.05 mg/kg to rabbits increased the adhesivity of thrombocytes, whereas intravenous introduction of 100 un/kg of heparin tended to greatly reduce it. On introduction of serotonin and epinephrine to rabbits against the background of heparin their ability to activate the thrombocytes adhesion diminished quite significantly. The logarithm of time lapsed from the instance of the heparin administration is linearly dependent on the logarithms of values characterizing the adhesivity of thrombocytes. Intravenous administration of norepinephrine and histamine in a dose of 0.5 mg/kg did not cause any changes in the adhesive properties of thrombocytes.
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PMID:17557
A double-blind trial of penbutolol: a new beta-receptor blocking agent in the treatment of angina pectoris.
A double-blind placebo controlled study of angina pectoris with penbutolol was undertaken in parallel groups in fifty-two patients. The duration of the study was six weeks. The dosage range for penbutolol was 8 mg to 50 mg per day. Six patients were dropped from the analysis. Seventeen patients (81%) in the penbutolol series exhibited a 50% reduction in anginal attacks, NTG consumption and subjective improvement. Significant reduction in nitrite intake was observed. Effort tolerance was improved significantly in those receiving penbutolol. Penbutolol was well-tolerated.
A double-blind trial of penbutolol: a new beta-receptor blocking agent in the treatment of angina pectoris. A double-blind placebo controlled study of angina pectoris with penbutolol was undertaken in parallel groups in fifty-two patients. The duration of the study was six weeks. The dosage range for penbutolol was 8 mg to 50 mg per day. Six patients were dropped from the analysis. Seventeen patients (81%) in the penbutolol series exhibited a 50% reduction in anginal attacks, NTG consumption and subjective improvement. Significant reduction in nitrite intake was observed. Effort tolerance was improved significantly in those receiving penbutolol. Penbutolol was well-tolerated.
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PMID:17558
A trial of benorylate tablets in the symptomatic relief of osteoarthritis.
The effectiveness of Benoral Tablets in controlling joint pain and stiffness in osteoarthritis was assessed over a two-week period in a multicentre general practice open study. In this trial it has been demonstrated that a correlation exists between pain relief from stiffness for patients suffering from osteoarthritis taking Benoral Tablets over this period. It was also found that patients with initially mild to moderate pain benefited most from their treatment.
A trial of benorylate tablets in the symptomatic relief of osteoarthritis. The effectiveness of Benoral Tablets in controlling joint pain and stiffness in osteoarthritis was assessed over a two-week period in a multicentre general practice open study. In this trial it has been demonstrated that a correlation exists between pain relief from stiffness for patients suffering from osteoarthritis taking Benoral Tablets over this period. It was also found that patients with initially mild to moderate pain benefited most from their treatment.
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PMID:17559
Polygraphic sleep recordings before and after the administration of flunitrazepam.
By means of polygraphic sleep recordings (EEG, EOG, EMG, ECG, EDG, Respirogram, Positogram), neurologic-psychologic investigation and questionnaires on subjective feeling, ten patients aged from 22 to 40 years (mean: 29 years), who suffered from irregular disturbances in falling asleep and in sleeping continuously, were examined over a period of ten consecutives nights. The first investigation night was reserved for adaptation of the patients and could therefore not be evaluated. On the following three evenings placebo (Placebo I) was given, then 2 mg of flunitrazepam for the ensuing three nights and placebo again (Placebo II) for the last three nights. Thus, 90 investigation nights could be evaluated. 1. Latency times until the patients fell asleep and up to the first deep sleep were reduced significantly by the active preparation. Latency times up to the first REM-phase were prolonged. 2. The frequency of nocturnal awakenings was lessened significantly. Thus, disturbances in sleeping continuously disappeared for the duration of the treatment. Duration of wakefulness after having woken during the night decreased considerably. 3. Duration of wakefulness during the total night was reduced considerably, deeper sleep stages, such as D (stage III) and E(stage IV) were prolonged. 4. Duration of the REM-phases was reduced slightly. This reduction was not significant according to the t-test. 5. According to these results, the preparation showed a clear effect. A placebo-effect can be excluded, since the improvements mentioned were not found when placebo was given before administration of the medication and afterwards (Placebo I and II). 6. When comparing our results to those of other authors, who described the effects of various preparations, we found that the substance flunitrazepam showed different effects.
Polygraphic sleep recordings before and after the administration of flunitrazepam. By means of polygraphic sleep recordings (EEG, EOG, EMG, ECG, EDG, Respirogram, Positogram), neurologic-psychologic investigation and questionnaires on subjective feeling, ten patients aged from 22 to 40 years (mean: 29 years), who suffered from irregular disturbances in falling asleep and in sleeping continuously, were examined over a period of ten consecutives nights. The first investigation night was reserved for adaptation of the patients and could therefore not be evaluated. On the following three evenings placebo (Placebo I) was given, then 2 mg of flunitrazepam for the ensuing three nights and placebo again (Placebo II) for the last three nights. Thus, 90 investigation nights could be evaluated. 1. Latency times until the patients fell asleep and up to the first deep sleep were reduced significantly by the active preparation. Latency times up to the first REM-phase were prolonged. 2. The frequency of nocturnal awakenings was lessened significantly. Thus, disturbances in sleeping continuously disappeared for the duration of the treatment. Duration of wakefulness after having woken during the night decreased considerably. 3. Duration of wakefulness during the total night was reduced considerably, deeper sleep stages, such as D (stage III) and E(stage IV) were prolonged. 4. Duration of the REM-phases was reduced slightly. This reduction was not significant according to the t-test. 5. According to these results, the preparation showed a clear effect. A placebo-effect can be excluded, since the improvements mentioned were not found when placebo was given before administration of the medication and afterwards (Placebo I and II). 6. When comparing our results to those of other authors, who described the effects of various preparations, we found that the substance flunitrazepam showed different effects.
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PMID:17563
Effect of secretin on plasma motilin in man.
Graded doses of 0-1, 0-3, 0-9, and 2-7 clinical units/kg/h of pure synthetic secretin were infused over 60 minute periods in six healthy volunteers. Duodenal bicarbonate output and pH were recorded and plasma secretin and motilin levels were measured by radioimmunoassay. During the infusions plasma motilin fell in a dose dependent manner to a nadir of 35%. This fall was linearly correlated with pancreatic bicarbonate output, whereas a non-linear correlation was observed between plasma motilin and both plasma secretin level and duodenal pH. It is suggested that plasma motilin levels are decreased by secretin-induced pancreatic bicarbonate juice flow. This may be important for the control of motilin secretion initiated by duodenal acidification and the concomitant delay in gastric emptying.
Effect of secretin on plasma motilin in man. Graded doses of 0-1, 0-3, 0-9, and 2-7 clinical units/kg/h of pure synthetic secretin were infused over 60 minute periods in six healthy volunteers. Duodenal bicarbonate output and pH were recorded and plasma secretin and motilin levels were measured by radioimmunoassay. During the infusions plasma motilin fell in a dose dependent manner to a nadir of 35%. This fall was linearly correlated with pancreatic bicarbonate output, whereas a non-linear correlation was observed between plasma motilin and both plasma secretin level and duodenal pH. It is suggested that plasma motilin levels are decreased by secretin-induced pancreatic bicarbonate juice flow. This may be important for the control of motilin secretion initiated by duodenal acidification and the concomitant delay in gastric emptying.
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PMID:17564
Jejunal mucosal gamma glutamyl transferase activity in coeliac disease.
In view of data suggesting that deficiency of gamma glutamyl transferase (GGT) may be the primary abnormality in the small-intestinal mucosa of patients with coeliac disease, this enzyme was measured in mucosal biopsies from coeliac patients at different stages of treatment. Activity was only slightly reduced in only one of nine well-treated patients, suggesting that deficiency of this enzyme has no primary role in the aetiology of coeliac disease.
Jejunal mucosal gamma glutamyl transferase activity in coeliac disease. In view of data suggesting that deficiency of gamma glutamyl transferase (GGT) may be the primary abnormality in the small-intestinal mucosa of patients with coeliac disease, this enzyme was measured in mucosal biopsies from coeliac patients at different stages of treatment. Activity was only slightly reduced in only one of nine well-treated patients, suggesting that deficiency of this enzyme has no primary role in the aetiology of coeliac disease.
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PMID:17565
Correlation between manometric and pH tests for gastro-oesophageal reflux.
A series of tests, including gastro-oesophageal sphincter pressure measurement, short-term pH tests, and 15-hour overnight oesophageal pH recording were applied to 42 normal subjects and 214 patients with typical reflux symptoms. The results were compared by multivariate discriminant analysis. Sphincter pressure measurements misclassified 32%, stressed provocative manoeuvres 14-5%, and the best single discriminator from the overnight pH study was time below pH 5, which misclassified 13%. However, a combination of the number of reflux episodes in 15 hours with their mean duration reduced misclassification to 8-8%. Using this function, a boundary between normal and reflux can be drawn, and the degree of abnormality can be expressed visually as well as numerically.
Correlation between manometric and pH tests for gastro-oesophageal reflux. A series of tests, including gastro-oesophageal sphincter pressure measurement, short-term pH tests, and 15-hour overnight oesophageal pH recording were applied to 42 normal subjects and 214 patients with typical reflux symptoms. The results were compared by multivariate discriminant analysis. Sphincter pressure measurements misclassified 32%, stressed provocative manoeuvres 14-5%, and the best single discriminator from the overnight pH study was time below pH 5, which misclassified 13%. However, a combination of the number of reflux episodes in 15 hours with their mean duration reduced misclassification to 8-8%. Using this function, a boundary between normal and reflux can be drawn, and the degree of abnormality can be expressed visually as well as numerically.
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PMID:17567
[Utilization of the MVA-immunization schedule from the view point of the public health service].
The world-wide smallpox eradication program sponsored by the WHO has been successful. Furthermore the legislation regarding smallpox vaccination in the Federal Republic of Germany has been given a new form. The place of the previous mass-vaccination has been taken by vaccination of individuals. Under this aspect safe procedures for vaccination are required. Any vaccination used by Public Health Service has to fulfill the following criteria: High protection against the disease without adverse side-effects or risks; it should be simple to administer and applicable under ordinary circumstances. For primary vaccination against smallpox the MVA-vaccination meets these demands entirely. It is reported about own experiences with 700 vaccinations using the attenuated virus "MVA"; complete documentation is given. Not a single complication nor any adverse side-effects have been seen. The Public Health Service has gained great experience in the field of vaccination. It is responsible for the protection of the individual as well as the public, as it is undesirable that there develops and unvaccinated group within the population. The individual claim a complete protection through vaccination which should be absolutely free of any risk.
[Utilization of the MVA-immunization schedule from the view point of the public health service]. The world-wide smallpox eradication program sponsored by the WHO has been successful. Furthermore the legislation regarding smallpox vaccination in the Federal Republic of Germany has been given a new form. The place of the previous mass-vaccination has been taken by vaccination of individuals. Under this aspect safe procedures for vaccination are required. Any vaccination used by Public Health Service has to fulfill the following criteria: High protection against the disease without adverse side-effects or risks; it should be simple to administer and applicable under ordinary circumstances. For primary vaccination against smallpox the MVA-vaccination meets these demands entirely. It is reported about own experiences with 700 vaccinations using the attenuated virus "MVA"; complete documentation is given. Not a single complication nor any adverse side-effects have been seen. The Public Health Service has gained great experience in the field of vaccination. It is responsible for the protection of the individual as well as the public, as it is undesirable that there develops and unvaccinated group within the population. The individual claim a complete protection through vaccination which should be absolutely free of any risk.
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PMID:17572
Characteristics of the maternal lymphoid response of mice to paternal strain antigens induced by homologous pregnancy.
Mice mated with H-2 incompatible males were shown to have an increased frequency of specific allocluster-forming spleen cells to paternal strain erythrocytes. The time course of the response was similar to that expected following a skin allograft. The graft-versus-host responsiveness of the maternal lymphocytes was generally elevated in the post-partum period in matings with males incompatible at either the H2 locus or non-H2 loci. The implications of these responses with respect to their different lymphocyte mediators and possible interactions are discussed with the view that a B-cell mediated immune response to paternal antigens may be contributory to foetal survival.
Characteristics of the maternal lymphoid response of mice to paternal strain antigens induced by homologous pregnancy. Mice mated with H-2 incompatible males were shown to have an increased frequency of specific allocluster-forming spleen cells to paternal strain erythrocytes. The time course of the response was similar to that expected following a skin allograft. The graft-versus-host responsiveness of the maternal lymphocytes was generally elevated in the post-partum period in matings with males incompatible at either the H2 locus or non-H2 loci. The implications of these responses with respect to their different lymphocyte mediators and possible interactions are discussed with the view that a B-cell mediated immune response to paternal antigens may be contributory to foetal survival.
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PMID:17574
Identification, separation, and preliminary characterization of invertase and beta-galactosidase in Actinomyces viscosus.
The initial step of disaccharide dissimilation by Actinomyces viscosus serotype 2 strain M-100 was studied. Sucrase activity was found in the 3,000 X g particulate fraction and the 37,000 X g soluble fraction of the cells, whereas lactase activity was found almost exclusively in the 37,000 X g soluble fraction. Neither sucrase nor lactase activity was appreciable in the culture liquor. Sucrose phosphorylase, alpha-glucosidase, and polysaccharide synthesis activities were not observed in the soluble cell fraction. The sucrase was identified as invertase (EC 3.2.1.26; beta-D-fructofuranoside fructohydrolase). The lactase was identified as beta-galactosidase (EC 3.2.1.23; beta-D-galactoside galactohydrolase). The enzymes in the 37,000 X g soluble fraction were separable by diethylamino-ethyl-cellulose chromatography, giving one beta-galactosidase peak and one major and one minor invertase peak. Acrylamide gel electrophoresis showed different electrophoretic mobilities of the enzymes. The molecular weight of the beta-galactosidase is about 4.2 X 10(5) and that of invertase is about 8.6 X 10(4). The beta-galactosidase has a Km for lactose of about 6 mM and a pH optimum between pH 6.0 and 6.5. The major invertase component has a Km for sucrose of about 71 mM and a pH optimum between pH 5.8 and 6.3.
Identification, separation, and preliminary characterization of invertase and beta-galactosidase in Actinomyces viscosus. The initial step of disaccharide dissimilation by Actinomyces viscosus serotype 2 strain M-100 was studied. Sucrase activity was found in the 3,000 X g particulate fraction and the 37,000 X g soluble fraction of the cells, whereas lactase activity was found almost exclusively in the 37,000 X g soluble fraction. Neither sucrase nor lactase activity was appreciable in the culture liquor. Sucrose phosphorylase, alpha-glucosidase, and polysaccharide synthesis activities were not observed in the soluble cell fraction. The sucrase was identified as invertase (EC 3.2.1.26; beta-D-fructofuranoside fructohydrolase). The lactase was identified as beta-galactosidase (EC 3.2.1.23; beta-D-galactoside galactohydrolase). The enzymes in the 37,000 X g soluble fraction were separable by diethylamino-ethyl-cellulose chromatography, giving one beta-galactosidase peak and one major and one minor invertase peak. Acrylamide gel electrophoresis showed different electrophoretic mobilities of the enzymes. The molecular weight of the beta-galactosidase is about 4.2 X 10(5) and that of invertase is about 8.6 X 10(4). The beta-galactosidase has a Km for lactose of about 6 mM and a pH optimum between pH 6.0 and 6.5. The major invertase component has a Km for sucrose of about 71 mM and a pH optimum between pH 5.8 and 6.3.
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PMID:17576
Corneal transplantation reaction in avascular keratoconus patients due to HLA-associated immune aberration against infection. A hypothesis.
HLA-B12 and HLA-B27 appeared to be characteristic of avascular keratoconus patients at risk of developing a corneal allograft reaction, which was mainly of late type and triggered by a nasopharyngeal infection. Equally incompatible grafts to patients with HLA-B5 had an uneventful course. This may be inference to the role of HLA-associated immune resistance factors, which necessitate the search for histocompatible corneal grafts also for avascular recipients bearing such indicators of risk.
Corneal transplantation reaction in avascular keratoconus patients due to HLA-associated immune aberration against infection. A hypothesis. HLA-B12 and HLA-B27 appeared to be characteristic of avascular keratoconus patients at risk of developing a corneal allograft reaction, which was mainly of late type and triggered by a nasopharyngeal infection. Equally incompatible grafts to patients with HLA-B5 had an uneventful course. This may be inference to the role of HLA-associated immune resistance factors, which necessitate the search for histocompatible corneal grafts also for avascular recipients bearing such indicators of risk.
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PMID:17578
Hepatic microsomal enzyme induction and its evaluation in a clinical laboratory.
We tried to determine whether short-term treatment with alpha-methyldopa, quinidine, digoxin, diazepam or furosemide--drugs in common use in hospitals--is capable of stimulating the activity of hepatic microsomal drug-metabolizing enzymes. Glucaric acid (GA) excretion and serum activity of gamma-glutamyl transpeptidase (GGT) were used as indicators of hepatic microsomal enzyme activity. Increased GA excretion was found in 45% and increased serum GGT activity in 40% of the patients on drug treatment. Only 14.3% showed an increase in both indicators. The excretion of GA rose significantly in patients who received drugs for less than 10 days, as compared with those who received drugs for less than 10 days, whereas the percentage of high GGT values did not rise significantly with increased duration of treatment. The lack of correlation between serum GGT activity and GA excretion casts doubt on the value of GGT as a consistent indicator of microsomal enzyme induction. GA excretion, on the other hand, seems to be a dependable index of microsomal enzyme induction in response to short-term treatment with standard doses of several widely used drugs.
Hepatic microsomal enzyme induction and its evaluation in a clinical laboratory. We tried to determine whether short-term treatment with alpha-methyldopa, quinidine, digoxin, diazepam or furosemide--drugs in common use in hospitals--is capable of stimulating the activity of hepatic microsomal drug-metabolizing enzymes. Glucaric acid (GA) excretion and serum activity of gamma-glutamyl transpeptidase (GGT) were used as indicators of hepatic microsomal enzyme activity. Increased GA excretion was found in 45% and increased serum GGT activity in 40% of the patients on drug treatment. Only 14.3% showed an increase in both indicators. The excretion of GA rose significantly in patients who received drugs for less than 10 days, as compared with those who received drugs for less than 10 days, whereas the percentage of high GGT values did not rise significantly with increased duration of treatment. The lack of correlation between serum GGT activity and GA excretion casts doubt on the value of GGT as a consistent indicator of microsomal enzyme induction. GA excretion, on the other hand, seems to be a dependable index of microsomal enzyme induction in response to short-term treatment with standard doses of several widely used drugs.
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PMID:17573
The interaction of barbiturates and analeptics.
The interaction of pentobarbitone sodium with three analeptics viz. micoren, pentylenetetrazol and methedrine was studied in mice. Micoren prolonged pentobarbitone sleeping time. pentylenetetrazol shortened the sleeping time. Methedrine also shortened the sleeping time, but clonic convulsions of mild to severe intensity were noticed 45-60 minutes after the drug injection.
The interaction of barbiturates and analeptics. The interaction of pentobarbitone sodium with three analeptics viz. micoren, pentylenetetrazol and methedrine was studied in mice. Micoren prolonged pentobarbitone sleeping time. pentylenetetrazol shortened the sleeping time. Methedrine also shortened the sleeping time, but clonic convulsions of mild to severe intensity were noticed 45-60 minutes after the drug injection.
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PMID:17579
[Unusually high gamma-glutamyltransferase level in the semen and ist diagnostic significance].
A remarkable high activity of the enzyme gamma-glutamyltransferase (gamma-GT) is found in seminal fluid in 200 to 500 fold higher concentrations as found in blood serum. The seminal fluid gamma-GT originates expecially in the prostate gland and, to a smaller extent, in spermatozoa and secretion of testis and epididymis. Gamma-GT could be valuable to investigate the function of the prostate gland.
[Unusually high gamma-glutamyltransferase level in the semen and ist diagnostic significance]. A remarkable high activity of the enzyme gamma-glutamyltransferase (gamma-GT) is found in seminal fluid in 200 to 500 fold higher concentrations as found in blood serum. The seminal fluid gamma-GT originates expecially in the prostate gland and, to a smaller extent, in spermatozoa and secretion of testis and epididymis. Gamma-GT could be valuable to investigate the function of the prostate gland.
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PMID:17575
Aids for in vitro Mycobacterium lepraemurium investigations: estimation of oxidation-reduction potentials and pO2 with 2, 6 dichlorophenol indophenol.
The partial success in cultivating a "host-dependent" microbe provided the incentive to develop methods which may aid the growth of the organism. The oxidation-reduction potential (ORP) of NC-5, an aerobic, cysteine containing medium which supports the limited in vitro growth of Mycobacterium lepraemurium, is measurable with the redox dye, 2, 6 dichlorophenol indophenol. Both cysteine and autoclaved glucose can be used to adjust to ORP. Glucose autoclaved in phosphate buffer but not in aqueous solutions reduced the dye. The dye was also reduced in glucose solutions by atmospheres containing 10% and 1%-2% pO2. With exposure to 20% pO2 the reoxidation of the dye was slow but complete. Thus, the dye in glucose solutions provides a general method for estimating pO2 above the level of anaerobiosis. Proper adjustment and monitoring of the ORP and pO2 may enhance growth.
Aids for in vitro Mycobacterium lepraemurium investigations: estimation of oxidation-reduction potentials and pO2 with 2, 6 dichlorophenol indophenol. The partial success in cultivating a "host-dependent" microbe provided the incentive to develop methods which may aid the growth of the organism. The oxidation-reduction potential (ORP) of NC-5, an aerobic, cysteine containing medium which supports the limited in vitro growth of Mycobacterium lepraemurium, is measurable with the redox dye, 2, 6 dichlorophenol indophenol. Both cysteine and autoclaved glucose can be used to adjust to ORP. Glucose autoclaved in phosphate buffer but not in aqueous solutions reduced the dye. The dye was also reduced in glucose solutions by atmospheres containing 10% and 1%-2% pO2. With exposure to 20% pO2 the reoxidation of the dye was slow but complete. Thus, the dye in glucose solutions provides a general method for estimating pO2 above the level of anaerobiosis. Proper adjustment and monitoring of the ORP and pO2 may enhance growth.
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PMID:17580
[Microchemical investigation of alpha D-glucosidases using 4-methylumnelliferyl- and 2-naphthyl-alpha-d-glucoside (author's transl)].
In crude homogenates prepared from freeze-dried cryostate sections of various rat organs the Km and Vmax of acid and neutral alpha-glucosidase as well as the effect of the pH, substrate and enzyme concentration and the incubation time on the activity were determined fluorometrically with 4-methylumbelliferyl- and 2-naphthyl alpha-d-glucoside as substrates. On the basis of the biochemical data 2 assays were developed for the microchemical measurement of both alpha-glucosidases in groups of epithelial cells isolated from freeze dried cryostate sections of the epididymis, jejunum, ilium, liver and kidney of suckling and adult rats. The rate of hydrolysis of 2-naphthyl and 4-methylumbelliferyl alpha-d-glucoside differs moderately. However, due to the higher sensitivity of 4-methylumbelliferone the methylumbelliferyl derivative is preferable especially for the evaluation of alpha-d-glucosidases in cells with low enzyme activity.
[Microchemical investigation of alpha D-glucosidases using 4-methylumnelliferyl- and 2-naphthyl-alpha-d-glucoside (author's transl)]. In crude homogenates prepared from freeze-dried cryostate sections of various rat organs the Km and Vmax of acid and neutral alpha-glucosidase as well as the effect of the pH, substrate and enzyme concentration and the incubation time on the activity were determined fluorometrically with 4-methylumbelliferyl- and 2-naphthyl alpha-d-glucoside as substrates. On the basis of the biochemical data 2 assays were developed for the microchemical measurement of both alpha-glucosidases in groups of epithelial cells isolated from freeze dried cryostate sections of the epididymis, jejunum, ilium, liver and kidney of suckling and adult rats. The rate of hydrolysis of 2-naphthyl and 4-methylumbelliferyl alpha-d-glucoside differs moderately. However, due to the higher sensitivity of 4-methylumbelliferone the methylumbelliferyl derivative is preferable especially for the evaluation of alpha-d-glucosidases in cells with low enzyme activity.
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PMID:17585
Nursing education in crisis: a computer alternative.
The impact of computer-assisted instruction upon the educational process is having its effect. The computer is being used in nursing education today to manage the educational environment, to instruct, to evaluate, to identify problem areas, to gather data, to manipulate data for research purposes and for continued education. As we struggle in our efforts for quality individualized education, we are minutely scrutinizing every aspect of the teaching learning process. We are not only examining how we teach but what we teach and why we are teaching it! Our deeper understanding of the process of education has helped us to delineate nursing process as content. Higher levels of instructional goals -- cognitive, affective and conative -- are resulting in education of the whole individual. The systematization of the learning process with the greater ease of accountability is leading nursing education to blaze promising new trails into the twenty-first century.
Nursing education in crisis: a computer alternative. The impact of computer-assisted instruction upon the educational process is having its effect. The computer is being used in nursing education today to manage the educational environment, to instruct, to evaluate, to identify problem areas, to gather data, to manipulate data for research purposes and for continued education. As we struggle in our efforts for quality individualized education, we are minutely scrutinizing every aspect of the teaching learning process. We are not only examining how we teach but what we teach and why we are teaching it! Our deeper understanding of the process of education has helped us to delineate nursing process as content. Higher levels of instructional goals -- cognitive, affective and conative -- are resulting in education of the whole individual. The systematization of the learning process with the greater ease of accountability is leading nursing education to blaze promising new trails into the twenty-first century.
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PMID:17589
Using the computer to prepare multiple-choice examinations: a simplified system.
Program TEST offers a quick, easy, and efficient way to produce objectively-scored exams from an established item bank. It is especially useful in situations where frequent testing is utilized and secretarial help is scarce. The capability of constructing a customized exam the day before its administration should make the exam more reflective of the instruction. The provision for keyed copies has been found to be a useful tool for feedback to the student after the exam. Lastly, use of the program requires little computer assistance.
Using the computer to prepare multiple-choice examinations: a simplified system. Program TEST offers a quick, easy, and efficient way to produce objectively-scored exams from an established item bank. It is especially useful in situations where frequent testing is utilized and secretarial help is scarce. The capability of constructing a customized exam the day before its administration should make the exam more reflective of the instruction. The provision for keyed copies has been found to be a useful tool for feedback to the student after the exam. Lastly, use of the program requires little computer assistance.
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PMID:17593
Itaconate, an isocitrate lyase-directed inhibitor in Pseudomonas indigofera.
Enzymes catalyzing steps from ethanol to acetyl-coenzyme A, from malate to pyruvate, and from pyruvate to glucose 6-phosphate were identified in ethanol-grown Pseudomonas indigofera. Enzymes catalyzing the catabolism of glucose to pyruvate via the Entner-Doudoroff pathway were identified in glucose-grown cells. Phosphofructokinase could not be detected in Pseudomonas indigofera. Itaconate, a potent inhibitor of isocitrate lyase, abolished growth of P. indigofera on ethanol at concentrations that had little effect upon growth on glucose. The date obtained through enzyme analyses and studies of itaconate inhibition with both extracts and toluene-treated cells suggest that itaconate selectively inhibits and reduces the specific activity of isocitrate lyase.
Itaconate, an isocitrate lyase-directed inhibitor in Pseudomonas indigofera. Enzymes catalyzing steps from ethanol to acetyl-coenzyme A, from malate to pyruvate, and from pyruvate to glucose 6-phosphate were identified in ethanol-grown Pseudomonas indigofera. Enzymes catalyzing the catabolism of glucose to pyruvate via the Entner-Doudoroff pathway were identified in glucose-grown cells. Phosphofructokinase could not be detected in Pseudomonas indigofera. Itaconate, a potent inhibitor of isocitrate lyase, abolished growth of P. indigofera on ethanol at concentrations that had little effect upon growth on glucose. The date obtained through enzyme analyses and studies of itaconate inhibition with both extracts and toluene-treated cells suggest that itaconate selectively inhibits and reduces the specific activity of isocitrate lyase.
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PMID:17594
Chemotaxis toward amino acids by Bdellovibrio bacteriovorus.
Chemotaxis toward amino acids by Bdellovibrio bacteriovorous strain UKi2 was studied by the capillary technique of Adler (J. Gen. Microbiol. 74:77-91, 1973). Chemotaxis was shown to be optimal when the capillaries were incubated at between 15 and 40 degrees C for 30 min; the optimal pH was between 7.0 and 8.2. The chemotactic response was proportional to the density of the suspension of bdellovibrios up to a density of 10(8) cells/ml. B. bacteriovorus was attracted to L-asparagine, L-cysteine, L-glutamine, glycine, L-histidine, L-lysine, and L-threonine. The possible roles of chemotaxis in the life of B. bacteriovorus are discussed.
Chemotaxis toward amino acids by Bdellovibrio bacteriovorus. Chemotaxis toward amino acids by Bdellovibrio bacteriovorous strain UKi2 was studied by the capillary technique of Adler (J. Gen. Microbiol. 74:77-91, 1973). Chemotaxis was shown to be optimal when the capillaries were incubated at between 15 and 40 degrees C for 30 min; the optimal pH was between 7.0 and 8.2. The chemotactic response was proportional to the density of the suspension of bdellovibrios up to a density of 10(8) cells/ml. B. bacteriovorus was attracted to L-asparagine, L-cysteine, L-glutamine, glycine, L-histidine, L-lysine, and L-threonine. The possible roles of chemotaxis in the life of B. bacteriovorus are discussed.
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PMID:17595
Fructose 1,6-diphosphate-activated L-lactate dehydrogenase from Streptococcus lactis: kinetic properties and factors affecting activation.
The L-(+)-lactate dehydrogenase (L-lactate:NAD+ oxidoreductase, EC 1.1.1.27) of Streptococcus lactis C10, like that of other streptococci, was activated by fructose 1,6-diphosphate (FDP). The enzyme showed some activity in the absence of FDP, with a pH optimum of 8.2; FDP decreased the Km for both pyruvate and reduced nicotinamide adenine dinucleotide (NADH) and shifted the pH optimum to 6.9. Enzyme activity showed a hyperbolic response to both NADH and pyruvate in all the buffers tried except phosphate buffer, in which the response to increasing NADH was sigmoidal. The FDP concentration required for half-maximal velocity (FDP0.5V) was markedly influenced by the nature of the assay buffer used. Thus the FDP0.5V was 0.002 mM in 90 mM triethanolamine buffer, 0.2 mM in 90 mM tris(hydroxymethyl)aminomethanemaleate buffer, and 4.4 mM in 90 mM phosphate buffer. Phosphate inhibition of FDP binding is not a general property of streptococcal lactate dehydrogenase, since the FDP0.5V value for S. faecalis 8043 lactate dehydrogenase was not increased by phosphate. The S. faecalis and S. lactis lactate dehydrogenases also differed in that Mn2+ enhanced FDP binding in S. faecalis but had no effect on the S. lactis dehydrogenase. The FDP concentration (12 to 15 mM) found in S. lactis cells during logarithmic growth on a high-carbohydrate (3% lactose) medium would be adequate to give almost complete activation of the lactate dehydrogenase even if the high FDP0.5V value found in 90 mM phosphate were similar to the FDP requirement in vivo.
Fructose 1,6-diphosphate-activated L-lactate dehydrogenase from Streptococcus lactis: kinetic properties and factors affecting activation. The L-(+)-lactate dehydrogenase (L-lactate:NAD+ oxidoreductase, EC 1.1.1.27) of Streptococcus lactis C10, like that of other streptococci, was activated by fructose 1,6-diphosphate (FDP). The enzyme showed some activity in the absence of FDP, with a pH optimum of 8.2; FDP decreased the Km for both pyruvate and reduced nicotinamide adenine dinucleotide (NADH) and shifted the pH optimum to 6.9. Enzyme activity showed a hyperbolic response to both NADH and pyruvate in all the buffers tried except phosphate buffer, in which the response to increasing NADH was sigmoidal. The FDP concentration required for half-maximal velocity (FDP0.5V) was markedly influenced by the nature of the assay buffer used. Thus the FDP0.5V was 0.002 mM in 90 mM triethanolamine buffer, 0.2 mM in 90 mM tris(hydroxymethyl)aminomethanemaleate buffer, and 4.4 mM in 90 mM phosphate buffer. Phosphate inhibition of FDP binding is not a general property of streptococcal lactate dehydrogenase, since the FDP0.5V value for S. faecalis 8043 lactate dehydrogenase was not increased by phosphate. The S. faecalis and S. lactis lactate dehydrogenases also differed in that Mn2+ enhanced FDP binding in S. faecalis but had no effect on the S. lactis dehydrogenase. The FDP concentration (12 to 15 mM) found in S. lactis cells during logarithmic growth on a high-carbohydrate (3% lactose) medium would be adequate to give almost complete activation of the lactate dehydrogenase even if the high FDP0.5V value found in 90 mM phosphate were similar to the FDP requirement in vivo.
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PMID:17596
On the apparent inhibition of intramolecular activation of pepsinogen by pepsin substrates.
Marciniszyn et al. (Marciniszyn, J., Huang, J. S. Hartsuch, J. A., Tang, J. (1976) J. Biol. Chem. 251, 7095-7102) have recently suggested an intermediate in the intramolecular activation of pepsinogen. As evidence, they showed apparent competitive inhibition of activation by globin, indication a pepsinogen-globin complex. Previous work had shown pepsinogen activation to occur very rapidly in the presence of high concentrations of hemoglobin, a very similar pepsin substrate (McPhie, P. (1974) Biochem. Biophys. Res. Commun. 56, 789-792). This contradiction has been resolved by a re-evaluation of the techniques used in the two investigations. The experimental conditions of Marciniszyn et al. Were inadequately defined to ensure denaturation of pepsin, a prerequisite of their method. A small decrease in pH, caused by the presence of extraneous protein, prevents this denaturation and leads to consistent underestimates of the rate of zymogen activation.
On the apparent inhibition of intramolecular activation of pepsinogen by pepsin substrates. Marciniszyn et al. (Marciniszyn, J., Huang, J. S. Hartsuch, J. A., Tang, J. (1976) J. Biol. Chem. 251, 7095-7102) have recently suggested an intermediate in the intramolecular activation of pepsinogen. As evidence, they showed apparent competitive inhibition of activation by globin, indication a pepsinogen-globin complex. Previous work had shown pepsinogen activation to occur very rapidly in the presence of high concentrations of hemoglobin, a very similar pepsin substrate (McPhie, P. (1974) Biochem. Biophys. Res. Commun. 56, 789-792). This contradiction has been resolved by a re-evaluation of the techniques used in the two investigations. The experimental conditions of Marciniszyn et al. Were inadequately defined to ensure denaturation of pepsin, a prerequisite of their method. A small decrease in pH, caused by the presence of extraneous protein, prevents this denaturation and leads to consistent underestimates of the rate of zymogen activation.
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PMID:17600
Circular dichroic and perturbation spectra of aromatic chromophores in rabbit tropomyosin. Topography of tyrosine residues.
1. Difference spectra of tryosyl residues obtained on denaturation of tropomycosin with urea or guanidinium chloride indicate that strong hydrophobic environments exist in the native coiled-coil state. 2. Solvent perturbation difference spectra indicate that tyrosyl residues are partially accessible to the solvent. The accessiblity decreases with increasing size of the solvent molecules. 3. Spectral pH titration of tyrosyl residues cannot provide information on the tyrosyl accessibility because conformational change accompanies the increase in pH. 4. Circular dichroism of tyrosyl and phenylalanyl residues is consistent with the effect of imposed conformational rigidity on the partially asymmetrical vibrational fine structure of the 1Lb absorption band of phenyl and benzyl chromophores; the effect is reduced by 70% on unfolding of tropomyosin.
Circular dichroic and perturbation spectra of aromatic chromophores in rabbit tropomyosin. Topography of tyrosine residues. 1. Difference spectra of tryosyl residues obtained on denaturation of tropomycosin with urea or guanidinium chloride indicate that strong hydrophobic environments exist in the native coiled-coil state. 2. Solvent perturbation difference spectra indicate that tyrosyl residues are partially accessible to the solvent. The accessiblity decreases with increasing size of the solvent molecules. 3. Spectral pH titration of tyrosyl residues cannot provide information on the tyrosyl accessibility because conformational change accompanies the increase in pH. 4. Circular dichroism of tyrosyl and phenylalanyl residues is consistent with the effect of imposed conformational rigidity on the partially asymmetrical vibrational fine structure of the 1Lb absorption band of phenyl and benzyl chromophores; the effect is reduced by 70% on unfolding of tropomyosin.
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PMID:17605
Purification and properties of tRNA(adenine-1)-methyltransferase from rat liver.
An S-adenosylmethionine-dependent tRNA(adenine-1)-methyltransferase has been purified 8,000-fold from rat liver. This preparation gives a single band on polyacrylamide gel electrophoresis and is stable in long term storage. The enzyme has a molecular weight of approximately 95,000. The single methylating capacity of this adenine-1 methyltransferase, using Escherichia coli tRNA2Glu, is methylation of the invariant adenine in the GTpsiC loop. The methylation reaction is dependent on added cation with 20 to 40 mM putrescine being most effective. The Km for S-adenosylmethionine was found to be 0.3 micron, while the Ki for the product inhibitor S-adenosylhomocysteine was 0.85 micron. The Km for tRNAMetf is 12 nM while that for tRNAGlu2 is 33 nM.
Purification and properties of tRNA(adenine-1)-methyltransferase from rat liver. An S-adenosylmethionine-dependent tRNA(adenine-1)-methyltransferase has been purified 8,000-fold from rat liver. This preparation gives a single band on polyacrylamide gel electrophoresis and is stable in long term storage. The enzyme has a molecular weight of approximately 95,000. The single methylating capacity of this adenine-1 methyltransferase, using Escherichia coli tRNA2Glu, is methylation of the invariant adenine in the GTpsiC loop. The methylation reaction is dependent on added cation with 20 to 40 mM putrescine being most effective. The Km for S-adenosylmethionine was found to be 0.3 micron, while the Ki for the product inhibitor S-adenosylhomocysteine was 0.85 micron. The Km for tRNAMetf is 12 nM while that for tRNAGlu2 is 33 nM.
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PMID:17606
PZ-peptidase from chick embryos. Purification, properties, and action on collagen peptides.
PZ-peptidase is an endopeptidase that cleaves the synthetic substrate developed for clostridial collagenase, 4-phenylazobenzyloxycarbonyl-L-Pro-L-Leu-Gly-L-Pro-D-Arg (PZ-peptide). The peptidase has been purified to homogeneity from chicken embryos. The enzyme has a pH optimum of 7.5 to 8.5, and isoelectric point of 5.0, and a molecular weight of 77,000. The kinetic parameters at pH 8 and 37 degrees are: Km = 2 X 10(-4) M and Vmax = 4.2 mumol/min/mg of protein. The enzyme is inhibited by p-hydroxymercuribenzoate (100%), N-ethylmaleimide (60%), and chelating agents (40 to 60%). Maximum activity is attained in the presence of reducing agents and Ca2+, Sr2+, or Mg2+. The peptidase has no detectable action on casein, serum albumin, collagen, collagen alpha chains, various collagen peptides (alpha1)(I)-CB2, alpha1(I)-CB3, alpha1(I)-CB4), (Gly-Pro-Pro)10, or (Gly-Pro-Pro)5. It does catalyze the hydrolysis of the Hyp--Gly bond in the 17-residue collagen peptide alpha1(II)-CB6-C2 and it partially digested a mixture of collagen peptides of molecular weight 350 to 2500. A role of this peptidase in collagen breakdown appears to be restricted to a late stage when degradation products would fall in the range of 5 to 30 residues.
PZ-peptidase from chick embryos. Purification, properties, and action on collagen peptides. PZ-peptidase is an endopeptidase that cleaves the synthetic substrate developed for clostridial collagenase, 4-phenylazobenzyloxycarbonyl-L-Pro-L-Leu-Gly-L-Pro-D-Arg (PZ-peptide). The peptidase has been purified to homogeneity from chicken embryos. The enzyme has a pH optimum of 7.5 to 8.5, and isoelectric point of 5.0, and a molecular weight of 77,000. The kinetic parameters at pH 8 and 37 degrees are: Km = 2 X 10(-4) M and Vmax = 4.2 mumol/min/mg of protein. The enzyme is inhibited by p-hydroxymercuribenzoate (100%), N-ethylmaleimide (60%), and chelating agents (40 to 60%). Maximum activity is attained in the presence of reducing agents and Ca2+, Sr2+, or Mg2+. The peptidase has no detectable action on casein, serum albumin, collagen, collagen alpha chains, various collagen peptides (alpha1)(I)-CB2, alpha1(I)-CB3, alpha1(I)-CB4), (Gly-Pro-Pro)10, or (Gly-Pro-Pro)5. It does catalyze the hydrolysis of the Hyp--Gly bond in the 17-residue collagen peptide alpha1(II)-CB6-C2 and it partially digested a mixture of collagen peptides of molecular weight 350 to 2500. A role of this peptidase in collagen breakdown appears to be restricted to a late stage when degradation products would fall in the range of 5 to 30 residues.
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PMID:17607
Studies on cobalt myoglobins and hemoglobins. Interaction of sperm whale myoglobin and Glycera hemoglobin with molecular oxygen.
The pH dependence of the electron paramagnetic resonance (EPR) spectrum and oxygen affinity of cobaltous porphyrin-containing myoglobin (CoMb) have been examined. The hyperfine structures of the EPR spectrum of oxy-CoMb undergo small, reversible pH-dependent changes with pK values of 5.33, 5.55, and 5.25 +/- 0.05 for proto-, meso-, and deutero-CoMb's, respectively, whereas deoxy-CoMb does not exhibit any pH dependence of its EPR spectrum. The partial pressure of oxygen at half-saturation of proto-CoMb decreases from 26 to 42 Torr on lowering the pH from 7.0 to 4.8. For comparison, we have prepared cobaltous porphyrin-containing monomeric Glycera hemoglobin (CoHb (Glycera)), in which the distal histidyl group of myoglobin is replaced by a leucyl residue, and examined the equilibria and kinetics of its oxygenation and EPR spectrum. CoHb (Glycera) has exhibited a very low oxygen affinity (p50 = 7 X 10(2) Torr at 5 degrees) and a large dissociation rate constant (more than 8 X 10(4) S-1 at 5 degrees). The EPR spectrum of oxy-CoHb (Glycera) was affected by neither pH nor replacement of H2O with D2O. Low temperature photodissociation studies by EPR and spectrophotometry have shown that the photolyzed form of the ligated hemoglobin (Glycera) is similar to its deoxy form, in contrast to myoglobin which gives a new intermediate states as the photolyzed form. These differences between CoMb and CoHb (Glycera) are interpreted with relation to the possible role of the distal histidyl residue in CoMb.
Studies on cobalt myoglobins and hemoglobins. Interaction of sperm whale myoglobin and Glycera hemoglobin with molecular oxygen. The pH dependence of the electron paramagnetic resonance (EPR) spectrum and oxygen affinity of cobaltous porphyrin-containing myoglobin (CoMb) have been examined. The hyperfine structures of the EPR spectrum of oxy-CoMb undergo small, reversible pH-dependent changes with pK values of 5.33, 5.55, and 5.25 +/- 0.05 for proto-, meso-, and deutero-CoMb's, respectively, whereas deoxy-CoMb does not exhibit any pH dependence of its EPR spectrum. The partial pressure of oxygen at half-saturation of proto-CoMb decreases from 26 to 42 Torr on lowering the pH from 7.0 to 4.8. For comparison, we have prepared cobaltous porphyrin-containing monomeric Glycera hemoglobin (CoHb (Glycera)), in which the distal histidyl group of myoglobin is replaced by a leucyl residue, and examined the equilibria and kinetics of its oxygenation and EPR spectrum. CoHb (Glycera) has exhibited a very low oxygen affinity (p50 = 7 X 10(2) Torr at 5 degrees) and a large dissociation rate constant (more than 8 X 10(4) S-1 at 5 degrees). The EPR spectrum of oxy-CoHb (Glycera) was affected by neither pH nor replacement of H2O with D2O. Low temperature photodissociation studies by EPR and spectrophotometry have shown that the photolyzed form of the ligated hemoglobin (Glycera) is similar to its deoxy form, in contrast to myoglobin which gives a new intermediate states as the photolyzed form. These differences between CoMb and CoHb (Glycera) are interpreted with relation to the possible role of the distal histidyl residue in CoMb.
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PMID:17608
Lipid A mutants of Salmonella typhimurium. Purification and characterization of a lipid A precursor produced by a mutant in 3-deoxy-D-mannooctulosonate-8-phosphate synthetase.
We describe here the isolation, purification, and structural characterization of a lipid A precursor synthesized under nonpermissive conditions by a mutant of Salmonella typhimurium conditionally defective in the synthesis of the 3-deoxy-D-mannoctulosonate (2-keto-3-deoxyoctonate, KDO) region of the lipopolysaccharide. The precursor was isolated free from lipopolysaccharide, murein, and phospholipids by extraction of delipidated cells with 90% phenol/CHCL3/petroleum ether. The molecule was recovered from the phenol phase after precipitation of lipopolysaccharide with H2O and subsequently purified by DEAE-cellulose chromatography. Structural analyses showed that the lipid A precursor is a phosphorylated glucosamine disaccharide containing one ester and two amide-linked residues of beta-hydroxymyristate. In contrast to lipid A, the precursor disaccharide lacks ester-linked 12:0 and 14:0 fatty acids as well as KDO. The molecule contains 2 phosphate residues both of which were identified as phosphomonoesters by 31P NMR spectroscopy. One of the phosphomonoesters is located in position 1 of the reducing terminal glucosamine residue; the location of the other phosphomonoester was not determined. The structure of the precursor provides strong support for the conclusion that KDO incorporation occurs at an early stage in lipid A biosynthesis prior to the incorporation of ester-linked saturated fatty acids.
Lipid A mutants of Salmonella typhimurium. Purification and characterization of a lipid A precursor produced by a mutant in 3-deoxy-D-mannooctulosonate-8-phosphate synthetase. We describe here the isolation, purification, and structural characterization of a lipid A precursor synthesized under nonpermissive conditions by a mutant of Salmonella typhimurium conditionally defective in the synthesis of the 3-deoxy-D-mannoctulosonate (2-keto-3-deoxyoctonate, KDO) region of the lipopolysaccharide. The precursor was isolated free from lipopolysaccharide, murein, and phospholipids by extraction of delipidated cells with 90% phenol/CHCL3/petroleum ether. The molecule was recovered from the phenol phase after precipitation of lipopolysaccharide with H2O and subsequently purified by DEAE-cellulose chromatography. Structural analyses showed that the lipid A precursor is a phosphorylated glucosamine disaccharide containing one ester and two amide-linked residues of beta-hydroxymyristate. In contrast to lipid A, the precursor disaccharide lacks ester-linked 12:0 and 14:0 fatty acids as well as KDO. The molecule contains 2 phosphate residues both of which were identified as phosphomonoesters by 31P NMR spectroscopy. One of the phosphomonoesters is located in position 1 of the reducing terminal glucosamine residue; the location of the other phosphomonoester was not determined. The structure of the precursor provides strong support for the conclusion that KDO incorporation occurs at an early stage in lipid A biosynthesis prior to the incorporation of ester-linked saturated fatty acids.
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PMID:17609
Role of coenzyme in aminotransferase turnover.
The role of coenzyme in determining intracellular contnet of pyridoxal enzymes was assessed by analyzing effects of pyridoxine deficiency on the rapidly degraded, readily dissociable tyrosine aminotransferase (EC 2.6.1.5) and the slowly degraded, nondissociable alanine aminotransferase (EC 2.6.1.2) of rat liver. Synthesis of the tyrosine enzyme was reduced, leading to a decreased amount of this enzyme, much of which was present as active apoenzyme. Synthesis of alanine aminotransferase was unchanged but much of this enzyme was present as an inactive apoenzyme which retained immunological reactivity. Degradation rates of both enzymes (t1/2 about 1.5 h, tyrosine aminotransferase; about 3 days, alanine aminotransferase) were not changed in pyridoxine deficiency. Hence, interaction with coenzyme is not a significant determinant in intracellular degradation of these aminotransferases. Coenzymes dissociation and intracellular stability probably reflect structural features of the proteins which determine both properties.
Role of coenzyme in aminotransferase turnover. The role of coenzyme in determining intracellular contnet of pyridoxal enzymes was assessed by analyzing effects of pyridoxine deficiency on the rapidly degraded, readily dissociable tyrosine aminotransferase (EC 2.6.1.5) and the slowly degraded, nondissociable alanine aminotransferase (EC 2.6.1.2) of rat liver. Synthesis of the tyrosine enzyme was reduced, leading to a decreased amount of this enzyme, much of which was present as active apoenzyme. Synthesis of alanine aminotransferase was unchanged but much of this enzyme was present as an inactive apoenzyme which retained immunological reactivity. Degradation rates of both enzymes (t1/2 about 1.5 h, tyrosine aminotransferase; about 3 days, alanine aminotransferase) were not changed in pyridoxine deficiency. Hence, interaction with coenzyme is not a significant determinant in intracellular degradation of these aminotransferases. Coenzymes dissociation and intracellular stability probably reflect structural features of the proteins which determine both properties.
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PMID:17611
In vitro reconstitution of demolybdosulfite oxidase by molybdate.
Reconstitution of purified demolybdosulfite oxidase from rat liver has been achieved using inorganic molybdate as the source of molybdenum. The activation process has a pH optimum of 7.4 and is dependent on concentrations of molybdate and demolybdoenzyme. The reaction is inhibited by high concentrations of anions and by reduction of the demolybdoenzyme and requires incubation temperatures higher than 30 degrees. A reconstitution mechanism involving loss of tungsten and concomitant replacement with molybdenum in those demolybdo molecules which contain tungsten is supported by the following observations: (a) the extent of activation achieved by molybdate corresponds to the proportion of molecules in the preparation which contain tungsten. (b) Incubation of the demolybdoenzyme preparation at 37 degrees in the absence of molybdate results in progressive and concentration-dependent loss of ability to be reconstituted by molybdate and a corresponding but more rapid loss of tungsten from the enzyme. The reconstituted enzyme displays the molybdenum EPR signal characteristic of native enzyme and is inactivated by incubation at 42 degrees in a manner identical to native sulfite oxidase.
In vitro reconstitution of demolybdosulfite oxidase by molybdate. Reconstitution of purified demolybdosulfite oxidase from rat liver has been achieved using inorganic molybdate as the source of molybdenum. The activation process has a pH optimum of 7.4 and is dependent on concentrations of molybdate and demolybdoenzyme. The reaction is inhibited by high concentrations of anions and by reduction of the demolybdoenzyme and requires incubation temperatures higher than 30 degrees. A reconstitution mechanism involving loss of tungsten and concomitant replacement with molybdenum in those demolybdo molecules which contain tungsten is supported by the following observations: (a) the extent of activation achieved by molybdate corresponds to the proportion of molecules in the preparation which contain tungsten. (b) Incubation of the demolybdoenzyme preparation at 37 degrees in the absence of molybdate results in progressive and concentration-dependent loss of ability to be reconstituted by molybdate and a corresponding but more rapid loss of tungsten from the enzyme. The reconstituted enzyme displays the molybdenum EPR signal characteristic of native enzyme and is inactivated by incubation at 42 degrees in a manner identical to native sulfite oxidase.
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PMID:17615
Lacerations of the flexor hallucis longus in the young athlete.
Of ten patients with lacerations of the flexor hallucis longus tendon, nine were athletically inclined. In four, the laceration was not repaired and no disability was evident. A functioning flexor hallucis longus, therefore, does not seem to be essential for good push-off and balance in running sports. If both the flexor hallucis brevis and the flexor hallucis longus are lacerated and reconstitution of the longus is not possible, the brevis should be repaired, suturing the distal segment of the longus to brevis to prevent hyperextension deformity of the metatarsophalangeal joint. Hypersensitivity of the scar due to associated nerve injury is a frequent complication associated with laceration of the flexor hallucis longus.
Lacerations of the flexor hallucis longus in the young athlete. Of ten patients with lacerations of the flexor hallucis longus tendon, nine were athletically inclined. In four, the laceration was not repaired and no disability was evident. A functioning flexor hallucis longus, therefore, does not seem to be essential for good push-off and balance in running sports. If both the flexor hallucis brevis and the flexor hallucis longus are lacerated and reconstitution of the longus is not possible, the brevis should be repaired, suturing the distal segment of the longus to brevis to prevent hyperextension deformity of the metatarsophalangeal joint. Hypersensitivity of the scar due to associated nerve injury is a frequent complication associated with laceration of the flexor hallucis longus.
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PMID:17616
Effects of cytosine arabinoside on differential gene expression in embryonic neural retina. II. Immunochemical studies on the accumulation of glutamine synthetase.
Cytosine arabinoside (Ara-C) elicits a significant increase in the level of the enzyme glutamine synthetase (GS) while it markedly reduces overall RNA and protein synthesis in cultures of embryonic chick neural retina. This increase was analyzed by radioimmunochemical procedures and compared with the induction of GS by hydrocortisone (HC). Accumulation of GS in Ara-C-treated retinas was found to be due to de novo synthesis of the enzyme; however, unlike the induction of GS by HC, Ara-C caused no measurable increase in the rate of GS synthesis. The results indicate that Ara-C facilitates GS accumulation largely by preventing degradation of the enzyme. Even though Ara-C inhibits the bulk of RNA synthesis in the retina, it does not stop the formation of GS-specific RNA templates. However, the progressive accumulation of these templates does not result in an increased rate of GS synthesis unless Ara-C is withdrawn from such cultures under suitable experimental conditions. Thus, it is suggested that the continuous presence of Ara-C imposes a reversible hindrance at the translational level which limits the rate of GS synthesis. The results demonstrate that the increase in retinal GS elicited by Ara-C is achieved through mechanisms which are quite different from those involved in the hydrocortisone-mediated induction of this enzyme.
Effects of cytosine arabinoside on differential gene expression in embryonic neural retina. II. Immunochemical studies on the accumulation of glutamine synthetase. Cytosine arabinoside (Ara-C) elicits a significant increase in the level of the enzyme glutamine synthetase (GS) while it markedly reduces overall RNA and protein synthesis in cultures of embryonic chick neural retina. This increase was analyzed by radioimmunochemical procedures and compared with the induction of GS by hydrocortisone (HC). Accumulation of GS in Ara-C-treated retinas was found to be due to de novo synthesis of the enzyme; however, unlike the induction of GS by HC, Ara-C caused no measurable increase in the rate of GS synthesis. The results indicate that Ara-C facilitates GS accumulation largely by preventing degradation of the enzyme. Even though Ara-C inhibits the bulk of RNA synthesis in the retina, it does not stop the formation of GS-specific RNA templates. However, the progressive accumulation of these templates does not result in an increased rate of GS synthesis unless Ara-C is withdrawn from such cultures under suitable experimental conditions. Thus, it is suggested that the continuous presence of Ara-C imposes a reversible hindrance at the translational level which limits the rate of GS synthesis. The results demonstrate that the increase in retinal GS elicited by Ara-C is achieved through mechanisms which are quite different from those involved in the hydrocortisone-mediated induction of this enzyme.
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PMID:17618
Modulation of in vitro erythropoiesis. The influence of beta-adrenergic agonists on erythroid colony formation.
Canine marrow erythroid colony growth is enhanced by agents linked to the adenyl cyclase/cyclic AMP (cAMP) system, including cAMP, a phosphodieterase inhibitor (RO-20-1724), cholera enterotoxin, and beta-adrenergic agonists. The adrenergic effect is mediated by receptors having beta2-subspecificity. These receptors are distinct from putative receptors for erythropoietin and those acted upon by cholera enterotoxin. In addition, the population of cells most responsive to beta-agonists is distinct from the majority of erythropoientin-responsive cells, perhaps representing a subpopulation of this class of cell. This demonstration of an adenyl cyclase-linked mechanism regulating mammalian erythroid colony growth provides a model for the modulation by other hormones or small molecules of in vitro and, perhaps, in vivo erythropoiesis.
Modulation of in vitro erythropoiesis. The influence of beta-adrenergic agonists on erythroid colony formation. Canine marrow erythroid colony growth is enhanced by agents linked to the adenyl cyclase/cyclic AMP (cAMP) system, including cAMP, a phosphodieterase inhibitor (RO-20-1724), cholera enterotoxin, and beta-adrenergic agonists. The adrenergic effect is mediated by receptors having beta2-subspecificity. These receptors are distinct from putative receptors for erythropoietin and those acted upon by cholera enterotoxin. In addition, the population of cells most responsive to beta-agonists is distinct from the majority of erythropoientin-responsive cells, perhaps representing a subpopulation of this class of cell. This demonstration of an adenyl cyclase-linked mechanism regulating mammalian erythroid colony growth provides a model for the modulation by other hormones or small molecules of in vitro and, perhaps, in vivo erythropoiesis.
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PMID:17619
Effect of ascorbic acid on arylsulfatase activities and sulfated proteoglycan metabolism in chondrocyte cultures.
A correlation between increased arylsulfatase activities and decreased sulfated proteoglycan content in human osteoarthritic articular cartilage suggested a possible interrelationship between these parameters. Since we had previously shown that ascorbate caused a decrease in levels of arylsulfatase A and B activities in normal chondrocyte cultures, the validity of the above relationship was examined by measuring the effect of vitamin C on the biosynthesis and distribution of 35S-labeled proteoglycans and arylsulfatase A and B activities in cell extracts of chondrocytes derived from normal and osteoarthritic tissue. Arylsulfatase A and B activities were found to be reduced in the presence of ascorbic acid in all normal and osteoarthritic cell lines examined when measured 3, 6, 10, and 13 days after the introduction of the vitamin in the culture medium. Acid phosphatase activity, on the other hand, was found to be elevated in the presence of ascorbate. The inhibitory effect by ascorbic acid on arylsulfatase activities could be reversed by withdrawing the vitamin from the nutrient medium. Addition of EDTA to the cell extracts before assay also reversed the inhibiton. Sulfated proteoglycan biosynthesis as reflected in 35S-sulfate uptake per milligram of DNA was significantly increased in the presence of ascorbic acid. The distribution of the newly synthesized molecules between the cell layer and medium fractions was altered. In the presence of ascorbate, more deposition into the cell layer of newly synthesized macromolecules occurred. These data suggest an inverse relationship between arylsulfatase activities and the stability of the newly synthesized sulfated proteoglycans in the extracellular matrix.
Effect of ascorbic acid on arylsulfatase activities and sulfated proteoglycan metabolism in chondrocyte cultures. A correlation between increased arylsulfatase activities and decreased sulfated proteoglycan content in human osteoarthritic articular cartilage suggested a possible interrelationship between these parameters. Since we had previously shown that ascorbate caused a decrease in levels of arylsulfatase A and B activities in normal chondrocyte cultures, the validity of the above relationship was examined by measuring the effect of vitamin C on the biosynthesis and distribution of 35S-labeled proteoglycans and arylsulfatase A and B activities in cell extracts of chondrocytes derived from normal and osteoarthritic tissue. Arylsulfatase A and B activities were found to be reduced in the presence of ascorbic acid in all normal and osteoarthritic cell lines examined when measured 3, 6, 10, and 13 days after the introduction of the vitamin in the culture medium. Acid phosphatase activity, on the other hand, was found to be elevated in the presence of ascorbate. The inhibitory effect by ascorbic acid on arylsulfatase activities could be reversed by withdrawing the vitamin from the nutrient medium. Addition of EDTA to the cell extracts before assay also reversed the inhibiton. Sulfated proteoglycan biosynthesis as reflected in 35S-sulfate uptake per milligram of DNA was significantly increased in the presence of ascorbic acid. The distribution of the newly synthesized molecules between the cell layer and medium fractions was altered. In the presence of ascorbate, more deposition into the cell layer of newly synthesized macromolecules occurred. These data suggest an inverse relationship between arylsulfatase activities and the stability of the newly synthesized sulfated proteoglycans in the extracellular matrix.
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PMID:17620
Studies on the mechanism of ristocetin-induced platelet agglutination. Effects of structural modification of ristocetin and vancomycin.
The mechanism by which ristocetin induces platelet agglutination in the presence of the von Willebrand factor was studied by chemically altering ristocetin and a similar antibiotic, vancomycin, by reaction with a water-soluble carbodiimide in the presence of glycine methyl ester at pH 4.75. Altering ristocetin's phenolic groups (which are thought to be important in its peptide-binding properties) resulted in a loss of both platelet-agglutinating and antibiotic activities. Restoring the phenolic groups with hydroxylamine restored both activities. Vancomycin has antibiotic and peptide-binding properties similar to ristocetin's, but differs structurally in having a free carboxyl group and thus a less positive charge at neutral pH. It does not induce platelet agglutination and actually inhibits ristocetin-induced agglutination. Reacting vancomycin with the water-soluble carbodiimide resulted in alteration of phenolic groups and permanent conversion of the carboxyl to a neutral derivative. Restoring the phenolic groups with hydroxylamine (but leaving the carboxyl neutralized) produced a compound with charge properties similar to ristocetin's which induced platelet agglutination as ristocetin does. These data suggest both a binding requirement (mediated through phenolic groups) and a strong positive charge requirement for ristocetin-induced agglutination. The data are consistent with a model wherein positively charged ristocetin binds, via its phenolic groups, to sites on the platelet surface and reduces the platelet's negative charge. This could reduce the electrostatic repulsion between platelets and/or between platelets and the negatively charged von Willebrand factor, and permit the macromolecular von Willebrand factor to cause agglutination by bridging between platelets.
Studies on the mechanism of ristocetin-induced platelet agglutination. Effects of structural modification of ristocetin and vancomycin. The mechanism by which ristocetin induces platelet agglutination in the presence of the von Willebrand factor was studied by chemically altering ristocetin and a similar antibiotic, vancomycin, by reaction with a water-soluble carbodiimide in the presence of glycine methyl ester at pH 4.75. Altering ristocetin's phenolic groups (which are thought to be important in its peptide-binding properties) resulted in a loss of both platelet-agglutinating and antibiotic activities. Restoring the phenolic groups with hydroxylamine restored both activities. Vancomycin has antibiotic and peptide-binding properties similar to ristocetin's, but differs structurally in having a free carboxyl group and thus a less positive charge at neutral pH. It does not induce platelet agglutination and actually inhibits ristocetin-induced agglutination. Reacting vancomycin with the water-soluble carbodiimide resulted in alteration of phenolic groups and permanent conversion of the carboxyl to a neutral derivative. Restoring the phenolic groups with hydroxylamine (but leaving the carboxyl neutralized) produced a compound with charge properties similar to ristocetin's which induced platelet agglutination as ristocetin does. These data suggest both a binding requirement (mediated through phenolic groups) and a strong positive charge requirement for ristocetin-induced agglutination. The data are consistent with a model wherein positively charged ristocetin binds, via its phenolic groups, to sites on the platelet surface and reduces the platelet's negative charge. This could reduce the electrostatic repulsion between platelets and/or between platelets and the negatively charged von Willebrand factor, and permit the macromolecular von Willebrand factor to cause agglutination by bridging between platelets.
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PMID:17621
Stabilization of factor VIII in plasma by the von Willebrand factor. Studies on posttransfusion and dissociated factor VIII and in patients with von Willebrand's disease.
In normal plasma, the ratio of the procoagulant activity of factor VIII (VIII(AHF)) to that of the von Willebrand factor activity (ristocetin cofactor, VIII(VWF)) or factor VIII antigen (VIII(AGN)) is approximately 1, but ratios > 1 (e.g., VIII(AHF) > VIII(VWF) or VIII(AGN)) may be observed in some patients with von Willebrand's disease and in the "late" posttransfusion plasmas of patients with this disorder. The lability of VIII(AHF) was studied by incubating plasma, diluted 1:10 in imidazole buffer pH 7.1, for 6 h at 37 degrees C. With normal plasmas, 77+/-12% (SD) of the original VIII(AHF) activity remained after incubation. VIII(AHF) was labile (e.g., 35-55% residual activity) in the "late" posttransfusion plasmas (VIII(AHF) >> VIII(VWF)) of a patient with von Willebrand's disease, but not in the "early" posttransfusion plasmas (VIII(AHF) approximately VIII(VWF)). VIII(AHF) was also labile in the (base-line) plasmas of three patients with von Willebrand's disease in whom the ratios of VIII(AHF) to VIII(VWF) were 4.4 to 8.1, but not in the plasmas of four other patients in whom the ratio was approximately 1. The electrophoretic mobility of factor VIII antigen was increased in two of the three patients with labile VIII(AHF). In both of these patients, and in the late posttransfusion plasmas, labile VIII(AHF) activity could be stabilized by the addition of purified von Willebrand factor (lacking VIII(AHF) activity) or by hemophilic plasma, but not by plasmas of patients with severe von Willebrand's disease. Thus, VIII(VWF) may serve to stabilize VIII(AHF) and this might explain the posttransfusion findings in von Willebrand's disease.
Stabilization of factor VIII in plasma by the von Willebrand factor. Studies on posttransfusion and dissociated factor VIII and in patients with von Willebrand's disease. In normal plasma, the ratio of the procoagulant activity of factor VIII (VIII(AHF)) to that of the von Willebrand factor activity (ristocetin cofactor, VIII(VWF)) or factor VIII antigen (VIII(AGN)) is approximately 1, but ratios > 1 (e.g., VIII(AHF) > VIII(VWF) or VIII(AGN)) may be observed in some patients with von Willebrand's disease and in the "late" posttransfusion plasmas of patients with this disorder. The lability of VIII(AHF) was studied by incubating plasma, diluted 1:10 in imidazole buffer pH 7.1, for 6 h at 37 degrees C. With normal plasmas, 77+/-12% (SD) of the original VIII(AHF) activity remained after incubation. VIII(AHF) was labile (e.g., 35-55% residual activity) in the "late" posttransfusion plasmas (VIII(AHF) >> VIII(VWF)) of a patient with von Willebrand's disease, but not in the "early" posttransfusion plasmas (VIII(AHF) approximately VIII(VWF)). VIII(AHF) was also labile in the (base-line) plasmas of three patients with von Willebrand's disease in whom the ratios of VIII(AHF) to VIII(VWF) were 4.4 to 8.1, but not in the plasmas of four other patients in whom the ratio was approximately 1. The electrophoretic mobility of factor VIII antigen was increased in two of the three patients with labile VIII(AHF). In both of these patients, and in the late posttransfusion plasmas, labile VIII(AHF) activity could be stabilized by the addition of purified von Willebrand factor (lacking VIII(AHF) activity) or by hemophilic plasma, but not by plasmas of patients with severe von Willebrand's disease. Thus, VIII(VWF) may serve to stabilize VIII(AHF) and this might explain the posttransfusion findings in von Willebrand's disease.
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PMID:17623
Central neurotransmitter substances and aging: a review.
Available evidence suggests that age is an important determinant of the levels of neurotransmitters and their associated enzymes and metabolites in some regions of the brain. Alterations at the synaptic level, or selective cell death in the brain, or both, may be implicated in progressive loss of function, behavioral changes and the onset of age-related diseases. Stimulation of hypothalamic neuroendocrine transducer cells by agents that alter neurotransmitter metabolism might provide some measure of control of the process of aging.
Central neurotransmitter substances and aging: a review. Available evidence suggests that age is an important determinant of the levels of neurotransmitters and their associated enzymes and metabolites in some regions of the brain. Alterations at the synaptic level, or selective cell death in the brain, or both, may be implicated in progressive loss of function, behavioral changes and the onset of age-related diseases. Stimulation of hypothalamic neuroendocrine transducer cells by agents that alter neurotransmitter metabolism might provide some measure of control of the process of aging.
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PMID:17626
The hydrolysis of Zectran in buffered and natural waters.
The analyses and rates of hydrolysis of Zectran, 4-dimethylamino-3,5-xylyl methylcarbamate are reported in aqueous media. These rates were measured in phosphate buffered, distilled water and in natural waters where tempteratures of 10 degrees, 20 degrees, and 28 degrees C. and pH values of 5.94, 7.00, and 8.42 were used. Intial concentrations of Zectran exceeded 60 mg/l (0.27 mMol 1(-1), whereas in the natural waters initial concentrations were 30 mg/l (0.135 mMol 1(-1). This study shows that the persistance of Zechtran in natural waters is, in large part, dependent upon the pH value and the temperature.
The hydrolysis of Zectran in buffered and natural waters. The analyses and rates of hydrolysis of Zectran, 4-dimethylamino-3,5-xylyl methylcarbamate are reported in aqueous media. These rates were measured in phosphate buffered, distilled water and in natural waters where tempteratures of 10 degrees, 20 degrees, and 28 degrees C. and pH values of 5.94, 7.00, and 8.42 were used. Intial concentrations of Zectran exceeded 60 mg/l (0.27 mMol 1(-1), whereas in the natural waters initial concentrations were 30 mg/l (0.135 mMol 1(-1). This study shows that the persistance of Zechtran in natural waters is, in large part, dependent upon the pH value and the temperature.
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PMID:17639
Immunofixation after electrofocusing: improved method for specific detection of serum proteins with determination of isoelectric points. I. Immunofixation print technique for detection of alpha-1-protease inhibitor.
An improved method is described for direct localization of human serum proteins in polyacrylamide gel with simultaneous determination of their isoelectric points (pI). The technique employs isoelectric focusing in thin-layer polyacrylamide gels to separate the serum proteins and the pH gradient is read at 4 degrees C with a dual-membrane surface microelectrode. Subsequently, the desired proteins are localized by immunofixation in the gel or by immunofixation-printing onto cellulose acetate strips soaked in specific antiserum. No sectioning of the electrofocused gel is necessary, and the entire technique can be completed in less than 14 h. When this method is applied to the detection of the genetic variants of alpha-1-antitrypsin (alpha-1-protease inhibitor) (A1Pi system), the results indicate that it can be used to specifically localize serum proteins whose pI's differ by as little as 0.01 pH units. The resolution afforded is especially evident in the analysis of A1Pi M variants.
Immunofixation after electrofocusing: improved method for specific detection of serum proteins with determination of isoelectric points. I. Immunofixation print technique for detection of alpha-1-protease inhibitor. An improved method is described for direct localization of human serum proteins in polyacrylamide gel with simultaneous determination of their isoelectric points (pI). The technique employs isoelectric focusing in thin-layer polyacrylamide gels to separate the serum proteins and the pH gradient is read at 4 degrees C with a dual-membrane surface microelectrode. Subsequently, the desired proteins are localized by immunofixation in the gel or by immunofixation-printing onto cellulose acetate strips soaked in specific antiserum. No sectioning of the electrofocused gel is necessary, and the entire technique can be completed in less than 14 h. When this method is applied to the detection of the genetic variants of alpha-1-antitrypsin (alpha-1-protease inhibitor) (A1Pi system), the results indicate that it can be used to specifically localize serum proteins whose pI's differ by as little as 0.01 pH units. The resolution afforded is especially evident in the analysis of A1Pi M variants.
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PMID:17640
Autonomic neuroeffector junctions--reflex vasodilatation of the skin.
A general model of the autonomic neuroeffector junction is proposed. In this model, emphasis is placed on the muscle effector bundle with electrotonic coupling between individual cells via gap junctions (or nexuses) and en passage release of transmitter from autonomic nerve varicosities. This release results in transmission to effector cells across junctional clefts ranging from about 20 nm in the vas deferens and iris to as much as 2000 nm in some large arteries. The ultrastructural identification of different autonomic nerve types is described. Current theories on the synthesis, storage, release, and inactivation of transmitter during cholinergic, adrenergic, and purinergic transmission are summarized. Some speculations are made about the possible involvement of purinergic nerves in the innervation of vessels and mast cells in the skin, and whether this involvement results in a functional link between ATP, histamine, bradykinin, and prostaglandin in cutaneous vasodilatation. Another possibility considered as the basis for this reflex is the release of substance P from sensory (pain) nerve collaterals in the skin.
Autonomic neuroeffector junctions--reflex vasodilatation of the skin. A general model of the autonomic neuroeffector junction is proposed. In this model, emphasis is placed on the muscle effector bundle with electrotonic coupling between individual cells via gap junctions (or nexuses) and en passage release of transmitter from autonomic nerve varicosities. This release results in transmission to effector cells across junctional clefts ranging from about 20 nm in the vas deferens and iris to as much as 2000 nm in some large arteries. The ultrastructural identification of different autonomic nerve types is described. Current theories on the synthesis, storage, release, and inactivation of transmitter during cholinergic, adrenergic, and purinergic transmission are summarized. Some speculations are made about the possible involvement of purinergic nerves in the innervation of vessels and mast cells in the skin, and whether this involvement results in a functional link between ATP, histamine, bradykinin, and prostaglandin in cutaneous vasodilatation. Another possibility considered as the basis for this reflex is the release of substance P from sensory (pain) nerve collaterals in the skin.
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PMID:17641
The Haarscheibe.
The Haarscheibe is a specialized spot of epidermis containing many Merkel cell-neurite complexes. It is a highly sensitive, slowly adapting, modality-specific touch receptor occurring in all mammals. Its exact role in signaling sensation in human beings is undetermined, and the function of Merkel cells, with their distinctive cytoplasmic granules, in transducing mechanical force into neural action potentials remains to be determined.
The Haarscheibe. The Haarscheibe is a specialized spot of epidermis containing many Merkel cell-neurite complexes. It is a highly sensitive, slowly adapting, modality-specific touch receptor occurring in all mammals. Its exact role in signaling sensation in human beings is undetermined, and the function of Merkel cells, with their distinctive cytoplasmic granules, in transducing mechanical force into neural action potentials remains to be determined.
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PMID:17642
Factors which influence blood platelet migration.
Migration of human blood platelets in vitro was investigated by a modification of the capillary-tube migration chamber technique used to study the migration inhibition factor of macrophages. Platelets were packed in capillary tubes and incubated in autologous platelet-free plasma (PFP). The extent of migration was quantified by planimetry (measurement of the area of platelet migration visible by stereomicroscopy). Among the various anticoagulants employed, sodium citrate was most suitable for studying platelet migration. Optimal migration occured at 22 degrees to 37 degrees C and pH 7.2 to 7.4. Migration was inhibited by metabolic inhibitors such as iodoacetic acid, sodium fluoride, and 2,4-dinitrophenol, and inhibition was proportional to the dose of the agent added to the incubation medium. Mobility was also inhibited by cytochalasin B, which disrupts cellular microfilaments, at 1 microgram/ml PFP, but not by colchicine, a microtubule inhibitor, even at 40 microgram/ml of PFP. Light and electron microscopy showed that this inhibition was not ascribable to platelet clumping. These observations suggest that platelet mobility is an active process. The possible significance of platelet migration in hemostasis is discussed.
Factors which influence blood platelet migration. Migration of human blood platelets in vitro was investigated by a modification of the capillary-tube migration chamber technique used to study the migration inhibition factor of macrophages. Platelets were packed in capillary tubes and incubated in autologous platelet-free plasma (PFP). The extent of migration was quantified by planimetry (measurement of the area of platelet migration visible by stereomicroscopy). Among the various anticoagulants employed, sodium citrate was most suitable for studying platelet migration. Optimal migration occured at 22 degrees to 37 degrees C and pH 7.2 to 7.4. Migration was inhibited by metabolic inhibitors such as iodoacetic acid, sodium fluoride, and 2,4-dinitrophenol, and inhibition was proportional to the dose of the agent added to the incubation medium. Mobility was also inhibited by cytochalasin B, which disrupts cellular microfilaments, at 1 microgram/ml PFP, but not by colchicine, a microtubule inhibitor, even at 40 microgram/ml of PFP. Light and electron microscopy showed that this inhibition was not ascribable to platelet clumping. These observations suggest that platelet mobility is an active process. The possible significance of platelet migration in hemostasis is discussed.
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PMID:17643
Intestinal absorption of alpha-tocopherol in the unanesthetized rat. The influence of luminal constituents on the absorptive process.
3H-alpha-tocopherol intestinal absorption was studied in the unanesthetized rat. The rate of alpha-tocopherol absorption remained linear over a wide range of concentrations (4 nM to 400 micrometer). Increasing the sodium taurocholate concentration in the micellar infusate up to 15 mM did not increase the rate of absorption of the vitamin. Addition of long-chain fatty acids to the micellar infusate decreased the absorption rate of the vitamin (p less than 0.05). The decrease was most significant (p less than 0.01) following the addition of the polyunsaturated linolenic (C18:3) acid. Increasing the hydrogen ion concentration in the perfusate increased the absorption rate of alpha-tocopherol. The present experiments in vivo support the conclusions drawn from in vitro uptake experiments which indicated that alpha-tocopherol is absorbed by a passive diffusion process. These experiments indicate that micellar expansion with polyunsaturated fatty acids interferes with the absorption of alpha-tocopherol and may result in deficiency of the vitamin.
Intestinal absorption of alpha-tocopherol in the unanesthetized rat. The influence of luminal constituents on the absorptive process. 3H-alpha-tocopherol intestinal absorption was studied in the unanesthetized rat. The rate of alpha-tocopherol absorption remained linear over a wide range of concentrations (4 nM to 400 micrometer). Increasing the sodium taurocholate concentration in the micellar infusate up to 15 mM did not increase the rate of absorption of the vitamin. Addition of long-chain fatty acids to the micellar infusate decreased the absorption rate of the vitamin (p less than 0.05). The decrease was most significant (p less than 0.01) following the addition of the polyunsaturated linolenic (C18:3) acid. Increasing the hydrogen ion concentration in the perfusate increased the absorption rate of alpha-tocopherol. The present experiments in vivo support the conclusions drawn from in vitro uptake experiments which indicated that alpha-tocopherol is absorbed by a passive diffusion process. These experiments indicate that micellar expansion with polyunsaturated fatty acids interferes with the absorption of alpha-tocopherol and may result in deficiency of the vitamin.
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PMID:17644
The defect of uric acid metabolism in Eck-fistula rats.
Because of the discovery of uric acid urolithiasis in rats after end-to-side portacaval anastomosis (PCA), uric acid metabolism was studied in these animals and in appropriate controls. Hyperuricemia and hyperuricosuria were observed in all experimental rats. The fraction of purine catabolites excreted in the urine as uric acid increased from an average of 4.8% to 15.3%. If 14C-uric specifically labeled at position 6 (6-14C-ua) was infused intravenously and the exhalation of 14CO2 was used to calculate a hepatic uric acid clearance, it decreased from 2.14 to 0.97 ml/min/100 gm despite a normal content of hepatic uricase activity as measured in liver homogenates. The fraction of the filtered amount of uric acid excreted in the urine increased from an average of 11% to 30%. Increased supersaturation of the urine with uric acid after PCA may be expected to contribute to the formation of uric acid urolithiasis. This investigation defines a hepatic and renal functional defect in uric acid metabolism which occurs as a result of the PCA.
The defect of uric acid metabolism in Eck-fistula rats. Because of the discovery of uric acid urolithiasis in rats after end-to-side portacaval anastomosis (PCA), uric acid metabolism was studied in these animals and in appropriate controls. Hyperuricemia and hyperuricosuria were observed in all experimental rats. The fraction of purine catabolites excreted in the urine as uric acid increased from an average of 4.8% to 15.3%. If 14C-uric specifically labeled at position 6 (6-14C-ua) was infused intravenously and the exhalation of 14CO2 was used to calculate a hepatic uric acid clearance, it decreased from 2.14 to 0.97 ml/min/100 gm despite a normal content of hepatic uricase activity as measured in liver homogenates. The fraction of the filtered amount of uric acid excreted in the urine increased from an average of 11% to 30%. Increased supersaturation of the urine with uric acid after PCA may be expected to contribute to the formation of uric acid urolithiasis. This investigation defines a hepatic and renal functional defect in uric acid metabolism which occurs as a result of the PCA.
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PMID:17647
Induction of specific tissue transplantation tolerance using fractionated total lymphoid irradiation in adult mice: long-term survival of allogeneic bone marrow and skin grafts.
BALB/c mice were treated with fractionated high dose (3,400 rads) total lymphoid irradiation (TLI), and given semiallogeneic (BALB/c x C57BL/Ka) or allogeneic (C57BL/Ka) bone marrow and/or skin allografts. TLI alone prolonged the mean survival time (m.s.t.) of C57BL/Ka skin grafts to 49.1 days (control, 10.7 days). Shielding of the thymus during TLI produced only a slight increase in graft survival (m.s.t., 19 days). TLI combined with splenectomy was no more effective than TLI alone. Infusion of 10(7) semiallogeneic or allogeneic bone marrow cells after TLI produced stable chimeras in 7/8 and 8/15 recipients, respectively. Chimeras were specifically tolerant to donor tissues, since C57BL/Ka skin grafts were accepted for more than 250 days, but third-party (C3H/He) skin grafts were rejected rapidly. In addition, chimeric lymphocytes responded to C3H/He and C3H. Q but not to C57BL/Ka cells in the one-way mixed leukocyte reactions. BALB/c C57BL/Ka chimeras showed no clinical evidence of graft vs. host disease. These findings may have application of clinical organ transplantation, since (a) the recipient treatment (TLI) has already been shown to be safe in humans, (b) donors and recipients can be completely allogeneic, and (c) bone marrow and skin graft survival was permanent (greater than 250 days).
Induction of specific tissue transplantation tolerance using fractionated total lymphoid irradiation in adult mice: long-term survival of allogeneic bone marrow and skin grafts. BALB/c mice were treated with fractionated high dose (3,400 rads) total lymphoid irradiation (TLI), and given semiallogeneic (BALB/c x C57BL/Ka) or allogeneic (C57BL/Ka) bone marrow and/or skin allografts. TLI alone prolonged the mean survival time (m.s.t.) of C57BL/Ka skin grafts to 49.1 days (control, 10.7 days). Shielding of the thymus during TLI produced only a slight increase in graft survival (m.s.t., 19 days). TLI combined with splenectomy was no more effective than TLI alone. Infusion of 10(7) semiallogeneic or allogeneic bone marrow cells after TLI produced stable chimeras in 7/8 and 8/15 recipients, respectively. Chimeras were specifically tolerant to donor tissues, since C57BL/Ka skin grafts were accepted for more than 250 days, but third-party (C3H/He) skin grafts were rejected rapidly. In addition, chimeric lymphocytes responded to C3H/He and C3H. Q but not to C57BL/Ka cells in the one-way mixed leukocyte reactions. BALB/c C57BL/Ka chimeras showed no clinical evidence of graft vs. host disease. These findings may have application of clinical organ transplantation, since (a) the recipient treatment (TLI) has already been shown to be safe in humans, (b) donors and recipients can be completely allogeneic, and (c) bone marrow and skin graft survival was permanent (greater than 250 days).
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PMID:17648
The phosphoenol-pyruvate branchpoint in adult Hymenolepis diminuta (Cestoda): a study of pyruvate kinase and phosphoenol-pyruvate carboxykinase.
The properties of pyruvate kinase (PK) and phosphoenol pyruvate carboxykinase (PEP CK), two enzymes that determine the preferrential accumulation of either succinate or lactate as endproducts of carbohydrate metabolism, are described in adult Hymenolepis diminuta. PK activity at Vmax and Km levels of PEP was unaffected by ATP, alanine, FDP4, OR H+ ions, but was inhibited by 50% at 6.3 mM L-lactate and 30 mM HCO3. The addition of 30 mM HCO3 increased the Km(PEP) by 6-fold but did not alter the Vmax. The inhibition of PK by HCO3 cannot be explained entirely by an effect of ionic strength, but probably represents a specific modulator-enzyme interaction. Under similar conditions PEP CK was maximally activated. Although L-lactate inhibited PEP CK (Ki(lac) = 1.8 mM), this effector may play a minor role in regulation of PEP flux. These results implicate the poise of the HCO3-:CO2 system as a major determiner of endproduct accumulation in H. diminuta.
The phosphoenol-pyruvate branchpoint in adult Hymenolepis diminuta (Cestoda): a study of pyruvate kinase and phosphoenol-pyruvate carboxykinase. The properties of pyruvate kinase (PK) and phosphoenol pyruvate carboxykinase (PEP CK), two enzymes that determine the preferrential accumulation of either succinate or lactate as endproducts of carbohydrate metabolism, are described in adult Hymenolepis diminuta. PK activity at Vmax and Km levels of PEP was unaffected by ATP, alanine, FDP4, OR H+ ions, but was inhibited by 50% at 6.3 mM L-lactate and 30 mM HCO3. The addition of 30 mM HCO3 increased the Km(PEP) by 6-fold but did not alter the Vmax. The inhibition of PK by HCO3 cannot be explained entirely by an effect of ionic strength, but probably represents a specific modulator-enzyme interaction. Under similar conditions PEP CK was maximally activated. Although L-lactate inhibited PEP CK (Ki(lac) = 1.8 mM), this effector may play a minor role in regulation of PEP flux. These results implicate the poise of the HCO3-:CO2 system as a major determiner of endproduct accumulation in H. diminuta.
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PMID:17650
The biosynthesis of a choline nucleotide by a cell-free extract from Streptococcus pneumoniae.
Choline, a component of the wall teichoic acid of Streptococcus pneumoniae, was converted to cytidine diphosphocholine via choline phosphate by enzymes which were identified in cell-free extracts of the pneumococcus. The first enzyme, choline kinase, was investigated in some detail. It appeared to have a pH optimum of 7.3 to 7.4 and was stimulated by Mg2+. Kinetic studies gave an apparent Michaelis constant (Km) for ATP of I mM, and for choline of 0.19 mM, with Vmax values of 3 nmol min-1 (mg protein)-1 and 0.5 nmol min-1 (mg protein)-1 respectively. The second enzyme, CDPcholine pyrophosphorylase was specific for CTP and had a requirement for Mg2+ with an optimum at 7 mM.
The biosynthesis of a choline nucleotide by a cell-free extract from Streptococcus pneumoniae. Choline, a component of the wall teichoic acid of Streptococcus pneumoniae, was converted to cytidine diphosphocholine via choline phosphate by enzymes which were identified in cell-free extracts of the pneumococcus. The first enzyme, choline kinase, was investigated in some detail. It appeared to have a pH optimum of 7.3 to 7.4 and was stimulated by Mg2+. Kinetic studies gave an apparent Michaelis constant (Km) for ATP of I mM, and for choline of 0.19 mM, with Vmax values of 3 nmol min-1 (mg protein)-1 and 0.5 nmol min-1 (mg protein)-1 respectively. The second enzyme, CDPcholine pyrophosphorylase was specific for CTP and had a requirement for Mg2+ with an optimum at 7 mM.
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PMID:17659
Childhood pheochromocytoma: treatment with alpha methyl tyrosine for resistant hypertension.
A 12-year-old boy with a norepinephrine-secreting pheochromocytoma that caused hypertension resistant to oral alpha adrenergic blockade is reported. Resistance to alpha adrenergic blocking agents developed when the patient's daily propranolol dosage was lowered from 10 to 1 mg/kg. Subsequently, alpha methyl tyrosine, an inhibitor of tyrosine hydroxylase, the rate-limiting enzyme in catecholamine biosynthesis, controlled the patient's blood pressure and was associated with reduction in total urinary catecholamine excretion. Norepinephrine content of the tumor and uninvolved adrenal gland removal at surgery was reduced. These findings confirm that alpha methyl tyrosine inhibited in vivo synthesis of catecholamines.
Childhood pheochromocytoma: treatment with alpha methyl tyrosine for resistant hypertension. A 12-year-old boy with a norepinephrine-secreting pheochromocytoma that caused hypertension resistant to oral alpha adrenergic blockade is reported. Resistance to alpha adrenergic blocking agents developed when the patient's daily propranolol dosage was lowered from 10 to 1 mg/kg. Subsequently, alpha methyl tyrosine, an inhibitor of tyrosine hydroxylase, the rate-limiting enzyme in catecholamine biosynthesis, controlled the patient's blood pressure and was associated with reduction in total urinary catecholamine excretion. Norepinephrine content of the tumor and uninvolved adrenal gland removal at surgery was reduced. These findings confirm that alpha methyl tyrosine inhibited in vivo synthesis of catecholamines.
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PMID:17661
A syndrome of childhood polyarteritis.
In this report the clinical, laboratory, and histopathologic findings of nine children with polyarteritis are reviewed. All have had evidence of systemic involvement. Eight presented with fever, calf pain, erythematous painful nodules, and elevation of the acute-phase reactants. All were treated with prednisone at a dosage of 2 mg/kg/day. All of the children are alive but have had relapses at least once during the course of tapering the dosage of corticosteroids. Serious complications of disease have included myocardial infarction, hypertension, and impaired renal function.
A syndrome of childhood polyarteritis. In this report the clinical, laboratory, and histopathologic findings of nine children with polyarteritis are reviewed. All have had evidence of systemic involvement. Eight presented with fever, calf pain, erythematous painful nodules, and elevation of the acute-phase reactants. All were treated with prednisone at a dosage of 2 mg/kg/day. All of the children are alive but have had relapses at least once during the course of tapering the dosage of corticosteroids. Serious complications of disease have included myocardial infarction, hypertension, and impaired renal function.
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PMID:17662
Necrotizing arteritis in acute poststreptococcal glomerulonephritis: report of a recovered case.
A patient with biopsy documented acute poststreptococcal glomerulonephritis and arteritis recovered completely with supportive therapy. Illness was preceded by group A streptococcal pharyngitis. At the time of presentation, serum creatinine concentration was 11.5 mg/dl. Serum cryoglobulins containing IgG and C3 were present. The first biopsy, performed during the acute illness, contained glomeruli with typical features of acute PSGN. Medium-sized arteries had extensive necrosis and leukocytic infiltration, and contained IgG, C3, and fibrin. Glomerular filtration rate returned to normal within three weeks; proteinuria cleared by three months, and microscopic hematuria by 11 months. Renal biopsy one year later showed minimal mesangial hypercellularity and no arteritis.
Necrotizing arteritis in acute poststreptococcal glomerulonephritis: report of a recovered case. A patient with biopsy documented acute poststreptococcal glomerulonephritis and arteritis recovered completely with supportive therapy. Illness was preceded by group A streptococcal pharyngitis. At the time of presentation, serum creatinine concentration was 11.5 mg/dl. Serum cryoglobulins containing IgG and C3 were present. The first biopsy, performed during the acute illness, contained glomeruli with typical features of acute PSGN. Medium-sized arteries had extensive necrosis and leukocytic infiltration, and contained IgG, C3, and fibrin. Glomerular filtration rate returned to normal within three weeks; proteinuria cleared by three months, and microscopic hematuria by 11 months. Renal biopsy one year later showed minimal mesangial hypercellularity and no arteritis.
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PMID:17663
Studies in acid-base balance. I. Effect of alkali therapy in newborn dogs with mechanically fixed ventilation.
The effect of rapid or slow infusion of hypertonic sodium bicarbonate on acid-base balance and serum osmolality was studied in 36 acidotic newborn dogs. Respiratory acidosis and hypoxia were produced by mechanically fixed hypoventilation. One group of animals breathed 100% O2 to prevent hypoxemia. Rapid infusion of HCO3- in acidotic and hypoxic animals resulted in only a transient (1 minute) and small (0.05 pH units) elevation of arterial pH followed by a continuous fall, resulting in a lower pH and a worsened metabolic condition than in the nontreated controls. In nonhypoxic acidotic animals, rapid infusion of HCO3- had little effect on arterial pH. PaCO2 increased suddenly by 17 Torr in hypoxic and, by 13 Torr, in nonhypoxic animals. There was a concomitant fall in PaO2 (15 Torr). Serum osmolality rose rapidly after rapid infusion of HCO3-. Rapid infusion of hypertonic bicarbonate into an animal or infant whose ventilation is fixed thus results in a less than predicted elevation of arterial pH. PaCO2 rises, PaO2 falls, and serum osmolality rises. The net result may be a worsening rather than an improvement in the animals' metabolic state.
Studies in acid-base balance. I. Effect of alkali therapy in newborn dogs with mechanically fixed ventilation. The effect of rapid or slow infusion of hypertonic sodium bicarbonate on acid-base balance and serum osmolality was studied in 36 acidotic newborn dogs. Respiratory acidosis and hypoxia were produced by mechanically fixed hypoventilation. One group of animals breathed 100% O2 to prevent hypoxemia. Rapid infusion of HCO3- in acidotic and hypoxic animals resulted in only a transient (1 minute) and small (0.05 pH units) elevation of arterial pH followed by a continuous fall, resulting in a lower pH and a worsened metabolic condition than in the nontreated controls. In nonhypoxic acidotic animals, rapid infusion of HCO3- had little effect on arterial pH. PaCO2 increased suddenly by 17 Torr in hypoxic and, by 13 Torr, in nonhypoxic animals. There was a concomitant fall in PaO2 (15 Torr). Serum osmolality rose rapidly after rapid infusion of HCO3-. Rapid infusion of hypertonic bicarbonate into an animal or infant whose ventilation is fixed thus results in a less than predicted elevation of arterial pH. PaCO2 rises, PaO2 falls, and serum osmolality rises. The net result may be a worsening rather than an improvement in the animals' metabolic state.
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PMID:17665
Mullerian inhibiting substance in human testes after birth.
Tiny testicular biopsies from humans were assayed for Mullerian inhibiting Substances using a graded organ culture technique. Mullerian Inhibiting Substance activity was high during the first year of life, declined during the second year of life, and then disappeared. Mullerian Inhibiting Substance activity is lower in boys with undescended testis than in children with normal or intersex testes at comparable ages under two years. It is possible that Mullerian Inhibiting Substance affects testicular descent as well as causing Mullerian duct regression.
Mullerian inhibiting substance in human testes after birth. Tiny testicular biopsies from humans were assayed for Mullerian inhibiting Substances using a graded organ culture technique. Mullerian Inhibiting Substance activity was high during the first year of life, declined during the second year of life, and then disappeared. Mullerian Inhibiting Substance activity is lower in boys with undescended testis than in children with normal or intersex testes at comparable ages under two years. It is possible that Mullerian Inhibiting Substance affects testicular descent as well as causing Mullerian duct regression.
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PMID:17667
Pharmaceutical suspensions: relation between zeta potential, sedimentation volume and suspension stability.
The effect of added surface-active agents of various ionic types on the sedimentation volume of drug suspensions of betamethasone, griseofulvin, nalidixic acid and thiabendazole has been investigated, and the results correlated with previously measured zeta potentials. Study of the zeta potential/sedimentation volumes versus concentration plots showed that apparently only coagulated, deflocculated or sterically stabilized systems were formed. In most cases the sterically stabilized systems were produced from mixtures of ionic/non-ionic surfactants. These are examples of controlled coagulation, although non-ionic surfactant alone conferred stability against caking. Secondary minimum flocculation was not apparent but this may have been due to the method of examination of suspensions. The work confirmed that the DLVO theory of colloid stability and its modification to include a steric term can be applied to coarse suspension systems.
Pharmaceutical suspensions: relation between zeta potential, sedimentation volume and suspension stability. The effect of added surface-active agents of various ionic types on the sedimentation volume of drug suspensions of betamethasone, griseofulvin, nalidixic acid and thiabendazole has been investigated, and the results correlated with previously measured zeta potentials. Study of the zeta potential/sedimentation volumes versus concentration plots showed that apparently only coagulated, deflocculated or sterically stabilized systems were formed. In most cases the sterically stabilized systems were produced from mixtures of ionic/non-ionic surfactants. These are examples of controlled coagulation, although non-ionic surfactant alone conferred stability against caking. Secondary minimum flocculation was not apparent but this may have been due to the method of examination of suspensions. The work confirmed that the DLVO theory of colloid stability and its modification to include a steric term can be applied to coarse suspension systems.
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PMID:17668
The in vitro bioavailability of various drugs formulated as hard gelatin capsules.
A factorially designed experiment has been carried out to study the influence of various additives on the in vitro release of drug from hard gelatin capsules. Analysis of variance confirms previous findings that, although the main factors of diluent type, diluent concentration, the absence and presence of both magnesium stearate and sodium lauryl sulphate, were highly significant, the existence of interactions between the factors prevented exact quantitative prediction of the influence of each factor. There appears however, to be a strong indication that the in vitro drug release of capsule formulations (y), expressed as the % of the drug content of the capsule which dissolves, can be related to the solubility of the drug (cs) by the expression y = 21-2 log cs + 31.2.
The in vitro bioavailability of various drugs formulated as hard gelatin capsules. A factorially designed experiment has been carried out to study the influence of various additives on the in vitro release of drug from hard gelatin capsules. Analysis of variance confirms previous findings that, although the main factors of diluent type, diluent concentration, the absence and presence of both magnesium stearate and sodium lauryl sulphate, were highly significant, the existence of interactions between the factors prevented exact quantitative prediction of the influence of each factor. There appears however, to be a strong indication that the in vitro drug release of capsule formulations (y), expressed as the % of the drug content of the capsule which dissolves, can be related to the solubility of the drug (cs) by the expression y = 21-2 log cs + 31.2.
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PMID:17664
Extraocular muscle transplantation.
1. The transplantation of extraocular homografts in dogs and humans has been described. 2. The extraocular muscle tissue transplanted remains viable, but loses its characteristics of muscle tissue during the period of the normal healing process following extraocular muscle surgery. 3. Autogenous homograft of extraocular muscle has an advantage over artificial synthetic material with the absence of extrusion and less reaction. 4. This is a clinically usable procedure today, especially in the amblyopic ehe with high deviation to accomplish an additional lengthening of one extraocular muscle, particularly if extraocular muscle surgery has previously been performed.
Extraocular muscle transplantation. 1. The transplantation of extraocular homografts in dogs and humans has been described. 2. The extraocular muscle tissue transplanted remains viable, but loses its characteristics of muscle tissue during the period of the normal healing process following extraocular muscle surgery. 3. Autogenous homograft of extraocular muscle has an advantage over artificial synthetic material with the absence of extrusion and less reaction. 4. This is a clinically usable procedure today, especially in the amblyopic ehe with high deviation to accomplish an additional lengthening of one extraocular muscle, particularly if extraocular muscle surgery has previously been performed.
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PMID:17669
Phase equilibria and stability characteristics of chlorpropamide-urea solid dispersions.
Physical mixtures and melts of various compositions of chlorpropamide and urea have been prepared. The phase diagrams and the effects of ageing of the systems have been measured by differential scanning calorimetry. The eutectic composition was found to contain 89% w/w chlorpropamide. Greater concentrations of chlorpropamide produced solid solutions of urea in chlorpropamide, whereas solid solution formation did not occur at compositions less than 89%. Melts in the range 50-100% chlorpropamide, which included the eutectic, existed as glass solids. The effect of ageing produced generally an increase in the liquidus peak temperature which was considered to be due to a gradual increase in crystal size.
Phase equilibria and stability characteristics of chlorpropamide-urea solid dispersions. Physical mixtures and melts of various compositions of chlorpropamide and urea have been prepared. The phase diagrams and the effects of ageing of the systems have been measured by differential scanning calorimetry. The eutectic composition was found to contain 89% w/w chlorpropamide. Greater concentrations of chlorpropamide produced solid solutions of urea in chlorpropamide, whereas solid solution formation did not occur at compositions less than 89%. Melts in the range 50-100% chlorpropamide, which included the eutectic, existed as glass solids. The effect of ageing produced generally an increase in the liquidus peak temperature which was considered to be due to a gradual increase in crystal size.
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PMID:17670
Derivatization to stabilize some aliphatic primary hydroxylamines for g.l.c. analysis.
By appropriate choice of trimethylsilylating and trifluoroacetylating reagents and organic solvents for extraction, stable derivative of aliphatic primary hydroxylamines metabolites, N-hydroxyphentermine, N-hydroxychlorphentermine, N-hydroxymexiletene, N-hydroxyphenethylamine, N-hydroxyamphetamine, and N-hydroxy-3,4-dimethoxyamphetamine, were obtained and examined by g.l.c. analysis without decomposition and without interference from the parent drug or other metabolic products.
Derivatization to stabilize some aliphatic primary hydroxylamines for g.l.c. analysis. By appropriate choice of trimethylsilylating and trifluoroacetylating reagents and organic solvents for extraction, stable derivative of aliphatic primary hydroxylamines metabolites, N-hydroxyphentermine, N-hydroxychlorphentermine, N-hydroxymexiletene, N-hydroxyphenethylamine, N-hydroxyamphetamine, and N-hydroxy-3,4-dimethoxyamphetamine, were obtained and examined by g.l.c. analysis without decomposition and without interference from the parent drug or other metabolic products.
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PMID:17672
Carrageenan and thrombin trigger prostaglandin synthetase-independent aggregation of rabbit platelets: inhibition by phospholipase A2 inhibitors.
Acetylsalicylic acid, salicylic acid and indomethacin were equally effective in inhibiting aggregation of plasma-free rabbit platelets induced by carrageenan and by thrombin. In contrast, only acetylsalicylic acid and indomethacin suppressed the accompanying formation of prostaglandin-like activities. Blockade of aggregation required the presence of the inhibitors in the platelet preparation, whereas blockade of prostaglandin synthetase remained even when the inhibitors were washed out. Prostaglandin synthetase-derived products appear not to be involved in the development of aggregation by carrageenan or by thrombin. Such aggregation was inhibited by two phospholipase A2 inhibitors, bromophenacyl bromide and mepacrine. It is suggested that carrageenan and thrombin-induced aggregation are mediated by non-prostaglandin, phospholipase A2-derived products.
Carrageenan and thrombin trigger prostaglandin synthetase-independent aggregation of rabbit platelets: inhibition by phospholipase A2 inhibitors. Acetylsalicylic acid, salicylic acid and indomethacin were equally effective in inhibiting aggregation of plasma-free rabbit platelets induced by carrageenan and by thrombin. In contrast, only acetylsalicylic acid and indomethacin suppressed the accompanying formation of prostaglandin-like activities. Blockade of aggregation required the presence of the inhibitors in the platelet preparation, whereas blockade of prostaglandin synthetase remained even when the inhibitors were washed out. Prostaglandin synthetase-derived products appear not to be involved in the development of aggregation by carrageenan or by thrombin. Such aggregation was inhibited by two phospholipase A2 inhibitors, bromophenacyl bromide and mepacrine. It is suggested that carrageenan and thrombin-induced aggregation are mediated by non-prostaglandin, phospholipase A2-derived products.
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PMID:17673
The interaction between clonidine and various neuroleptic agents and some benzodiazepine tranquillizers.
The central hypotensive action of clonidine, infused into the vertebral artery of chloralose-anaesthetized cats was antagonized by several phenothiazine-neuroleptics (chlorpromazine, promazine, promethazine, thiethylperazine, thioridazine), by chlorprothixene and to a limited extent by haloperidol administered via the same route. Pimozide and some benzodiazepines (chlordiazepoxide, diazepam and flurazepam) hardly influenced the central hypotensive response to clonidine. The antagonism between clonidine and the psychotropic drugs is probably associated with central alpha-adrenoceptors, clonidine being the agonist and the neuroleptic agents the antagonists at these receptors. Virtually the same type of antagonism was observed in conscious, spontaneously hypertensive rats where both clonidine and the neuroleptic drugs were injected intravenously. The phenothiazines and also piperoxane effectively diminished the centrally induced hypotensive response to clonidine, whereas the initial pressor effect to clonidine was not reduced.
The interaction between clonidine and various neuroleptic agents and some benzodiazepine tranquillizers. The central hypotensive action of clonidine, infused into the vertebral artery of chloralose-anaesthetized cats was antagonized by several phenothiazine-neuroleptics (chlorpromazine, promazine, promethazine, thiethylperazine, thioridazine), by chlorprothixene and to a limited extent by haloperidol administered via the same route. Pimozide and some benzodiazepines (chlordiazepoxide, diazepam and flurazepam) hardly influenced the central hypotensive response to clonidine. The antagonism between clonidine and the psychotropic drugs is probably associated with central alpha-adrenoceptors, clonidine being the agonist and the neuroleptic agents the antagonists at these receptors. Virtually the same type of antagonism was observed in conscious, spontaneously hypertensive rats where both clonidine and the neuroleptic drugs were injected intravenously. The phenothiazines and also piperoxane effectively diminished the centrally induced hypotensive response to clonidine, whereas the initial pressor effect to clonidine was not reduced.
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PMID:17687
The enkephalins and opiates: structure-activity relations.
The X-ray structures of 9 "opiate" drugs which exhibit a range of pharmacological activity have been examined in detail leading to the theory that one of the reasons why the enkephalins and related peptides possess morphine-like activity is because they have a tyrosine, and hence a "tyramine", residue at the amino terminal position. This residue or a conformationally similar moiety, can be shown to be present in many opiates and analogues.
The enkephalins and opiates: structure-activity relations. The X-ray structures of 9 "opiate" drugs which exhibit a range of pharmacological activity have been examined in detail leading to the theory that one of the reasons why the enkephalins and related peptides possess morphine-like activity is because they have a tyrosine, and hence a "tyramine", residue at the amino terminal position. This residue or a conformationally similar moiety, can be shown to be present in many opiates and analogues.
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PMID:17688
Stereoselective drug distribution and anticoagulant potency of the enantiomers of phenprocoumon in rats.
The elimination, distribution and anticoagulant activity of S(-)-, R(+)-, and R,S(+/-)- phenoprocoumon were determined in male Wistar-Lewis rats after intravenous injection of a single dose of 0.6 mg kg-1. From the plasma concentrations which elicited the same anticoagulant effect, S(-)-phenprocoumon was 4 to 5 times more potent than R(+)-phenprocouman. The potency of the racemate was between those of the enantiomers. The mean biologic half-life of the S(-)-enantiomer was shorter (12-5 h) than that of R(+)-phenprocoumon (17-8 h). No differences were observed in the apparent volume of distribution. However, the mean liver:plasma concentration ratio was higher for the S(-)-(6-9) than for the R(+)-enantiomer (5-2). At a total concentration of 16-8 microgram ml-1 the percentage of unbound drug in rat serum was significantly higher for the S(-)- (1-13%) than that for the R(+)-enantiomer (0.76%). Values obtained for the racemate were always between those of the enantiomers. It is concluded that stereoselective differences in the distribution between plasma and liver, and consequently in the rate of elimination are most likely due to stereoselective differences in serum protein binding. The greater anticoagulant potency of the S(-)- over the R(+)-enantiomer, cannot be explained primarily by the observed pharmacokinetic differences.
Stereoselective drug distribution and anticoagulant potency of the enantiomers of phenprocoumon in rats. The elimination, distribution and anticoagulant activity of S(-)-, R(+)-, and R,S(+/-)- phenoprocoumon were determined in male Wistar-Lewis rats after intravenous injection of a single dose of 0.6 mg kg-1. From the plasma concentrations which elicited the same anticoagulant effect, S(-)-phenprocoumon was 4 to 5 times more potent than R(+)-phenprocouman. The potency of the racemate was between those of the enantiomers. The mean biologic half-life of the S(-)-enantiomer was shorter (12-5 h) than that of R(+)-phenprocoumon (17-8 h). No differences were observed in the apparent volume of distribution. However, the mean liver:plasma concentration ratio was higher for the S(-)-(6-9) than for the R(+)-enantiomer (5-2). At a total concentration of 16-8 microgram ml-1 the percentage of unbound drug in rat serum was significantly higher for the S(-)- (1-13%) than that for the R(+)-enantiomer (0.76%). Values obtained for the racemate were always between those of the enantiomers. It is concluded that stereoselective differences in the distribution between plasma and liver, and consequently in the rate of elimination are most likely due to stereoselective differences in serum protein binding. The greater anticoagulant potency of the S(-)- over the R(+)-enantiomer, cannot be explained primarily by the observed pharmacokinetic differences.
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PMID:17689
The effects of etilefrine on blood vessels in the rat tail.
Etilefrine was found to constrict blood vessels in the rat tail through a mechanism which was partly dependent on the sympathetic nerves present in these vessels. The response to the drug was enhanced by pretreagment with noradrenaline and cocaine, and totally abolished by the alpha-receptor antagonist phentolamine. When compared with several other sympathomimetic agents which were tested on the vessel, etilefrine appeared to have a low order of vasoconstrictor activity. These findings would seem to have considerable relevance to the clinical situation where an attempt has been made to use etilefrine in the treatment of patients with orthostatic hypotension.
The effects of etilefrine on blood vessels in the rat tail. Etilefrine was found to constrict blood vessels in the rat tail through a mechanism which was partly dependent on the sympathetic nerves present in these vessels. The response to the drug was enhanced by pretreagment with noradrenaline and cocaine, and totally abolished by the alpha-receptor antagonist phentolamine. When compared with several other sympathomimetic agents which were tested on the vessel, etilefrine appeared to have a low order of vasoconstrictor activity. These findings would seem to have considerable relevance to the clinical situation where an attempt has been made to use etilefrine in the treatment of patients with orthostatic hypotension.
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PMID:17690
The effects of prostaglandins E1, E2, F1alpha and F2alpha on guinea-pig ileal and colonic peristalis.
Prostaglandins (PGE1, E2, F1alpha and F2alpha) have been tested on the peristaltic reflex in isolated segments of guinea-pig ileum and colon using simultaneous recordings of fluid propulsion and longitudinal and circular muscle activity. Propulsion and circular muscle peristaltic activity were increased by serosally applied PGF compounds in the ileum and PGE or PGF compounds in the colon following initial contraction of the longitudinal muscle. This is consistent with a role for prostaglandins in peristalsis. Mucosally applied PGF compounds has no significant effect.
The effects of prostaglandins E1, E2, F1alpha and F2alpha on guinea-pig ileal and colonic peristalis. Prostaglandins (PGE1, E2, F1alpha and F2alpha) have been tested on the peristaltic reflex in isolated segments of guinea-pig ileum and colon using simultaneous recordings of fluid propulsion and longitudinal and circular muscle activity. Propulsion and circular muscle peristaltic activity were increased by serosally applied PGF compounds in the ileum and PGE or PGF compounds in the colon following initial contraction of the longitudinal muscle. This is consistent with a role for prostaglandins in peristalsis. Mucosally applied PGF compounds has no significant effect.
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PMID:17691
The identification and analysis of mexiletine and its metabolic products in man.
Sensitive and specific gas-liquid chromatographic methods were developed for the analysis of mexiletine and its metabolites in urine of man. The identity of the g.l.c. peaks was established by mass-spectrometry. The hydroxylamine (Va) was qualitatively identified and determined quantitatively after conversion to the more stable oxime (Vb). Selective extraction procedures, t.l.c. and derivatization with hexamethyldisilazane (HMDS) and trifluoroacetic anhydride (TFA) were used in the qualitative identification of the major metabolites (VI-IX), particularly in distinguishing the basic products VI and VII from their corresponding alcoholic products VIII and IX. The limit of detection of the g.l.c. method was 6 to 12 ng ml-1 for compounds I-IV, and 40 to 50 ng ml-1 for compounds Vb-IX.
The identification and analysis of mexiletine and its metabolic products in man. Sensitive and specific gas-liquid chromatographic methods were developed for the analysis of mexiletine and its metabolites in urine of man. The identity of the g.l.c. peaks was established by mass-spectrometry. The hydroxylamine (Va) was qualitatively identified and determined quantitatively after conversion to the more stable oxime (Vb). Selective extraction procedures, t.l.c. and derivatization with hexamethyldisilazane (HMDS) and trifluoroacetic anhydride (TFA) were used in the qualitative identification of the major metabolites (VI-IX), particularly in distinguishing the basic products VI and VII from their corresponding alcoholic products VIII and IX. The limit of detection of the g.l.c. method was 6 to 12 ng ml-1 for compounds I-IV, and 40 to 50 ng ml-1 for compounds Vb-IX.
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PMID:17692
The decomposition of acidic and neutral cannabinoids in organic solvents.
High-pressure liquid chromatography was used to study (a) the relative efficiencies of methanol, chloroform, light petroleum (B.P. 40-60 degrees) and methanol-chloroform (9:1) for extracting neutral and acidic cannabinoids from cannabis resin; (b) the decomposition patterns of the resulting solutions under various storage conditions, and (c) the cannabinoid profile of a cross section through a block of cannabis resin. The results show that (a) methanol is the most effective extracting solvent of those tested; (b) acidic cannabinoids in solution decompose in darkness by varying amounts depending on the temperature, solvent, storage time and particular cannabinoid; (c) neutral cannabinoids in solution are relatively stable in darkness; (d) daylight causes appreciable decomposition of both acidic and neutral cannabinoids in solution, (e) the cannabinoid profile of a resin is complex with lower levels of acidic material in the outer layers.
The decomposition of acidic and neutral cannabinoids in organic solvents. High-pressure liquid chromatography was used to study (a) the relative efficiencies of methanol, chloroform, light petroleum (B.P. 40-60 degrees) and methanol-chloroform (9:1) for extracting neutral and acidic cannabinoids from cannabis resin; (b) the decomposition patterns of the resulting solutions under various storage conditions, and (c) the cannabinoid profile of a cross section through a block of cannabis resin. The results show that (a) methanol is the most effective extracting solvent of those tested; (b) acidic cannabinoids in solution decompose in darkness by varying amounts depending on the temperature, solvent, storage time and particular cannabinoid; (c) neutral cannabinoids in solution are relatively stable in darkness; (d) daylight causes appreciable decomposition of both acidic and neutral cannabinoids in solution, (e) the cannabinoid profile of a resin is complex with lower levels of acidic material in the outer layers.
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PMID:17693
Application of orthogonal functions to the spectrophotometric determination of phenytoin in pharmaceutical preparations.
A simple ultraviolet spectrophotometric method for the determination of phenytoin in pharmaceutical preparations has been developed. The mean was 100.9% (6 determinations) and the coefficient of variation was 1.2%. The method was applied successfully to the determination of phenytoin in capsules and suspensions.
Application of orthogonal functions to the spectrophotometric determination of phenytoin in pharmaceutical preparations. A simple ultraviolet spectrophotometric method for the determination of phenytoin in pharmaceutical preparations has been developed. The mean was 100.9% (6 determinations) and the coefficient of variation was 1.2%. The method was applied successfully to the determination of phenytoin in capsules and suspensions.
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PMID:17694
The influence of additives on the presentation of a drug in hard gelatin capsules.
The influence of the concentration of lactose, magnesium stearate and sodium lauryl sulphate in the in vitro dissolution and the drug content of hard gelatin capsules filled under conditions which result in a maximum tapped bulk density, has been evaluated by a factorially-designed experiment. The 3 factors have a significant effect on both drug release and capsule filling. Interactions between the 3 factors, however, limit the exact quantification of the magnitude of their influence by a simple linear model. A quadratic relation, when only 2 factors are considered, can be used to provide a prediction of the influence of these factors. The relations between 2 factors are demonstrated as contours of equal in vitro drug release and equal drug content of capsule, at constant concentrations of the third factor. The contours show the important influence of lactose concentration drug release and capsule filling, and the large changes in response which can occur by the addition of a third factor. They also provide a clear guide to the formulation of hard gelatin capsules.
The influence of additives on the presentation of a drug in hard gelatin capsules. The influence of the concentration of lactose, magnesium stearate and sodium lauryl sulphate in the in vitro dissolution and the drug content of hard gelatin capsules filled under conditions which result in a maximum tapped bulk density, has been evaluated by a factorially-designed experiment. The 3 factors have a significant effect on both drug release and capsule filling. Interactions between the 3 factors, however, limit the exact quantification of the magnitude of their influence by a simple linear model. A quadratic relation, when only 2 factors are considered, can be used to provide a prediction of the influence of these factors. The relations between 2 factors are demonstrated as contours of equal in vitro drug release and equal drug content of capsule, at constant concentrations of the third factor. The contours show the important influence of lactose concentration drug release and capsule filling, and the large changes in response which can occur by the addition of a third factor. They also provide a clear guide to the formulation of hard gelatin capsules.
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PMID:17695
The distribution of components in the different size fractions of granules prepared from binary mixtures.
Boric acid, sulphanilamide and citric acid have been mixed separately with lactose and then granulated by massing and screening. The granules have been fractionated by sieving and each fraction has been analysed for lactose content. The effect of premixing time, massing time, binder volume and ratio of components on the distribution of lactose between size fractions of granules prepared from lactose: boric acid mixtures has been investigated. Uneven distribution of lactose has been found for all blends examined. There is a premixing time and massing time that gives the optimum distribution of lactose for any given blend and binder volume. Increased binder volume in some cases improves granule uniformity. The proportion of lactose in the blend has a major effect on the distribution of this component in the granules, as does the particle size of the lactose. Granules prepared from blends of lactose with sulphanilamide and with citric acid were also examined for lactose distribution.
The distribution of components in the different size fractions of granules prepared from binary mixtures. Boric acid, sulphanilamide and citric acid have been mixed separately with lactose and then granulated by massing and screening. The granules have been fractionated by sieving and each fraction has been analysed for lactose content. The effect of premixing time, massing time, binder volume and ratio of components on the distribution of lactose between size fractions of granules prepared from lactose: boric acid mixtures has been investigated. Uneven distribution of lactose has been found for all blends examined. There is a premixing time and massing time that gives the optimum distribution of lactose for any given blend and binder volume. Increased binder volume in some cases improves granule uniformity. The proportion of lactose in the blend has a major effect on the distribution of this component in the granules, as does the particle size of the lactose. Granules prepared from blends of lactose with sulphanilamide and with citric acid were also examined for lactose distribution.
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PMID:17708
Desensitization to portrayals of real-life aggression as a function of exposure to television violence.
In two separate experiments, the hypothesis that exposure to violence in the context of television drama decreases subjects' emotional responsivity to portrayals of real-life aggression was tested. Subjects were shown either an excerpt from a violent police drama or a segment of an exciting but nonviolent volley-ball game before watching a videotaped scene of real aggression. Emotionality was measured by changes in skin resistance which was measured continuously throughout the session. In Experiment 1, subjects were 8- to 10-year-old children and the real aggression was a film of an argument and fight between two preschoolers. In Experiment 2, college students participated and reactions to real aggression were measured while subjects watched scenes from news films of the riots at the 1968 Democratic National Convention. With the exception of adult females, subjects who previously had viewed the aggression drama were less aroused by the scenes of real aggression than were subjects who had seen the control film. Further support for the hypothesis was provided by the finding that for most groups of subjects, the amount of television violence normally viewed was negatively related to responsivity while viewing aggression.
Desensitization to portrayals of real-life aggression as a function of exposure to television violence. In two separate experiments, the hypothesis that exposure to violence in the context of television drama decreases subjects' emotional responsivity to portrayals of real-life aggression was tested. Subjects were shown either an excerpt from a violent police drama or a segment of an exciting but nonviolent volley-ball game before watching a videotaped scene of real aggression. Emotionality was measured by changes in skin resistance which was measured continuously throughout the session. In Experiment 1, subjects were 8- to 10-year-old children and the real aggression was a film of an argument and fight between two preschoolers. In Experiment 2, college students participated and reactions to real aggression were measured while subjects watched scenes from news films of the riots at the 1968 Democratic National Convention. With the exception of adult females, subjects who previously had viewed the aggression drama were less aroused by the scenes of real aggression than were subjects who had seen the control film. Further support for the hypothesis was provided by the finding that for most groups of subjects, the amount of television violence normally viewed was negatively related to responsivity while viewing aggression.
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PMID:17710
Determination of aqueous solubility and pKa values of estrogens.
Reported estrone pKa and solubility data show wide variation. Improved experimental procedures were designed and used to obtain reproducible results. The pKa values for several estrogens and related compounds also were determined to assess the effects of structural differences on ionization. No evidence was obtained for long-range D to A ring electronic transmission affecting pKa. Significant differences in pKa values resulted only when conjugated unsaturation was added into the B ring of estrone or estradiol. The aqueous solubilities of estrone and 17alpha-estradiol were 0.8 and 3.9 microgram/ml, respectively, at 25degrees.
Determination of aqueous solubility and pKa values of estrogens. Reported estrone pKa and solubility data show wide variation. Improved experimental procedures were designed and used to obtain reproducible results. The pKa values for several estrogens and related compounds also were determined to assess the effects of structural differences on ionization. No evidence was obtained for long-range D to A ring electronic transmission affecting pKa. Significant differences in pKa values resulted only when conjugated unsaturation was added into the B ring of estrone or estradiol. The aqueous solubilities of estrone and 17alpha-estradiol were 0.8 and 3.9 microgram/ml, respectively, at 25degrees.
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PMID:17711
Acetylacroninium salts as soluble prodrugs of the antineoplastic agent acronine.
The low aqueous solubility of acronine (approximately 2 mg/liter) has been overcome by identification of quaternary prodrug salts exhibiting apparent molar solubilities two to five orders of magnitude greater than acronine. The synthesis and kinetics of hydrolysis of the various prodrug acetylacroninium salts were studied, and the half-life for hydrolysis under conditions approximating the in vivo situation was estimated to be about 5 min. Such rapid reversion, together with the greatly increased solubility, appears to qualify the prodrug for intravenous use.
Acetylacroninium salts as soluble prodrugs of the antineoplastic agent acronine. The low aqueous solubility of acronine (approximately 2 mg/liter) has been overcome by identification of quaternary prodrug salts exhibiting apparent molar solubilities two to five orders of magnitude greater than acronine. The synthesis and kinetics of hydrolysis of the various prodrug acetylacroninium salts were studied, and the half-life for hydrolysis under conditions approximating the in vivo situation was estimated to be about 5 min. Such rapid reversion, together with the greatly increased solubility, appears to qualify the prodrug for intravenous use.
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PMID:17712
Microencapsulation of phenobarbital by spray polycondensation.
A new method for the microencapsulation of solids is described. It is based on the polycondensation of amphiphilic and, thus, tensioactive precondensates on a melamine-formaldehyde base on the surface of suspended particles during spray drying. A film-forming agent, preferably one that reacts chemically with the resin, is indispensable for spray drying and also for the formation of an efficient membrane around the drug particles. The resulting microcapsules are essentially spherical and have, after appropriate curing, a sustained-release effect in vitro. The factors that most influence the formation and properties of the microcapsules are the composition (qualitative and quantitative), pH, and viscosity of the suspension.
Microencapsulation of phenobarbital by spray polycondensation. A new method for the microencapsulation of solids is described. It is based on the polycondensation of amphiphilic and, thus, tensioactive precondensates on a melamine-formaldehyde base on the surface of suspended particles during spray drying. A film-forming agent, preferably one that reacts chemically with the resin, is indispensable for spray drying and also for the formation of an efficient membrane around the drug particles. The resulting microcapsules are essentially spherical and have, after appropriate curing, a sustained-release effect in vitro. The factors that most influence the formation and properties of the microcapsules are the composition (qualitative and quantitative), pH, and viscosity of the suspension.
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PMID:17713
Quantitative analysis of degradation products in pilocarpine hydrochloride ophthalmic formulations.
The presence of isopilocarpine, an epimer of pilocarpine, and of pilocarpinic acid, a hydrolytic degradation product of pilocarpine, was established and all three substances were assayed in various commercial ophthalmic formulations of pilocarpine hydrochloride by 13C-Fourier transform spectroscopy. Assay was based upon integrated intensities of selected resonances from any formulation calibrated against the intensity of tetramethylammonium bromide, used as a common external reference. The normalized intensities were then related to those of a reference solution of pilocarpine hydrochloride, thereby eliminating any factor arising from variability of 13C-relaxation times. The 13C-resonance for the N-methyl group, being common to all products, provides a convenient basis for the assay of the total alkaloid content whereas the C-8 resonances are best suited for assaying residual pilocarpine and its degradation products. This procedure, estimated as accurate to +/- 5%, constitutes the first comprehensive analytical method to differentiate between pilocarpine and its degradation products.
Quantitative analysis of degradation products in pilocarpine hydrochloride ophthalmic formulations. The presence of isopilocarpine, an epimer of pilocarpine, and of pilocarpinic acid, a hydrolytic degradation product of pilocarpine, was established and all three substances were assayed in various commercial ophthalmic formulations of pilocarpine hydrochloride by 13C-Fourier transform spectroscopy. Assay was based upon integrated intensities of selected resonances from any formulation calibrated against the intensity of tetramethylammonium bromide, used as a common external reference. The normalized intensities were then related to those of a reference solution of pilocarpine hydrochloride, thereby eliminating any factor arising from variability of 13C-relaxation times. The 13C-resonance for the N-methyl group, being common to all products, provides a convenient basis for the assay of the total alkaloid content whereas the C-8 resonances are best suited for assaying residual pilocarpine and its degradation products. This procedure, estimated as accurate to +/- 5%, constitutes the first comprehensive analytical method to differentiate between pilocarpine and its degradation products.
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PMID:17714
Determination of meclizine hydrochloride by ion-pair extraction with methyl orange.
A method, based on ion-pair extraction, is described for the quantification of meclizine hydrochloride in various pharmaceutical dosage forms, for content uniformity determination, and for concentration monitoring in dissolution and bioavailability studies. Methyl orange, dissolved in pH 2.8 MacIlvaine buffer, gave excellent recovery of meclizine after its isolation from aqueous solutions of gelatin, urine, and blood serum. The chloroform-extracted molecular species appeared to be a 1:1 ion-pair. Beer's law was obeyed for a wide concentration range. Because the extracted species seemed well defined and stable and since a surface or an interphase adsorption phenomenon was not a problem, the reported method is considered sensitive, accurate, precise, rapid, and simple.
Determination of meclizine hydrochloride by ion-pair extraction with methyl orange. A method, based on ion-pair extraction, is described for the quantification of meclizine hydrochloride in various pharmaceutical dosage forms, for content uniformity determination, and for concentration monitoring in dissolution and bioavailability studies. Methyl orange, dissolved in pH 2.8 MacIlvaine buffer, gave excellent recovery of meclizine after its isolation from aqueous solutions of gelatin, urine, and blood serum. The chloroform-extracted molecular species appeared to be a 1:1 ion-pair. Beer's law was obeyed for a wide concentration range. Because the extracted species seemed well defined and stable and since a surface or an interphase adsorption phenomenon was not a problem, the reported method is considered sensitive, accurate, precise, rapid, and simple.
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