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PMID:12882 | Gamma-Glutamyltransferase: kinetic properties and assay conditions when gamma-glutamyl-4-nitroanilide and its 3-carboxy derivative are used as donor substrates. | The kinetics of human serum gamma-glutamyltransferase (EC 2.3.2.2) were investigated, with use of glycylglycine as a gamma-glutamyl acceptor substrate and gamma-glutamyl-4-nitroanilide and its carboxy derivative, gamma-glutamyl-3-carboxy-4-nitroanilide, as donor substrates. The simultaneous occurrence of both gamma-glutamyltransfer and autotransfer was established by descending paper chromatography. Constant-ratio double-reciprocal plots confirm that the enzyme mechanism is nonsequential (ping-pong bi-bi). Inhibition by either donor was not found, and inhibition by glycylglycine was only observed at concentrations above those of clinical interest. Kinetic constants obtained by nonlinear regression analysis of initial velocity data were used to determine reagent substrate concentrations for the assay of this enzyme. An assay with use of 4 mmol of gamma-glutamyl-3-carboxy-4-nitroanilide and 100 mmol of glycylglycine per liter yielded equivalent activities to those by assay with use of 4 mmol of gamma-glutamyl-4-nitroanilide and 40 mmol of glycylglycine per liter. These concentrations of the carboxy donor and glycylglycine are also "cost optimal" and present no procedural problems when used. | Gamma-Glutamyltransferase: kinetic properties and assay conditions when gamma-glutamyl-4-nitroanilide and its 3-carboxy derivative are used as donor substrates. The kinetics of human serum gamma-glutamyltransferase (EC 2.3.2.2) were investigated, with use of glycylglycine as a gamma-glutamyl acceptor substrate and gamma-glutamyl-4-nitroanilide and its carboxy derivative, gamma-glutamyl-3-carboxy-4-nitroanilide, as donor substrates. The simultaneous occurrence of both gamma-glutamyltransfer and autotransfer was established by descending paper chromatography. Constant-ratio double-reciprocal plots confirm that the enzyme mechanism is nonsequential (ping-pong bi-bi). Inhibition by either donor was not found, and inhibition by glycylglycine was only observed at concentrations above those of clinical interest. Kinetic constants obtained by nonlinear regression analysis of initial velocity data were used to determine reagent substrate concentrations for the assay of this enzyme. An assay with use of 4 mmol of gamma-glutamyl-3-carboxy-4-nitroanilide and 100 mmol of glycylglycine per liter yielded equivalent activities to those by assay with use of 4 mmol of gamma-glutamyl-4-nitroanilide and 40 mmol of glycylglycine per liter. These concentrations of the carboxy donor and glycylglycine are also "cost optimal" and present no procedural problems when used. | [
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PMID:12883 | Biochemical characterization of the tartrate-resistant acid phosphatase of human spleen with leukemic reticuloendotheliosis as a pyrophosphatase. | A tartrate-resistant acid phosphatase was isolated from a human leukemic spleen by freeze-thawing in saline and purified by repeated chromatography on carboxymethyl-cellulose. The purified enzyme has a molecular weight of 64 000. It catalyzes the hydrolysis of inorganic and organic pyrophosphate as well as the phenolic ester of monoorthophosphate, with optimal activity between pH 5 and 6. However, there is no activity toward mono-orthophosphate esters of aliphatic alcohols. The present data have identified its catalytic function as a pyrophosphatase. However, it has properties different from the pyrophosphatase previously observed in normal animal tissues. | Biochemical characterization of the tartrate-resistant acid phosphatase of human spleen with leukemic reticuloendotheliosis as a pyrophosphatase. A tartrate-resistant acid phosphatase was isolated from a human leukemic spleen by freeze-thawing in saline and purified by repeated chromatography on carboxymethyl-cellulose. The purified enzyme has a molecular weight of 64 000. It catalyzes the hydrolysis of inorganic and organic pyrophosphate as well as the phenolic ester of monoorthophosphate, with optimal activity between pH 5 and 6. However, there is no activity toward mono-orthophosphate esters of aliphatic alcohols. The present data have identified its catalytic function as a pyrophosphatase. However, it has properties different from the pyrophosphatase previously observed in normal animal tissues. | [
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|
PMID:12884 | Ultraviolet spectrometry of serum triglycerides by a totally enzymic method adapted to a centrifugal analyzer. | We described a micromethod for determining serum triglycerides (triacylglycerols) with the centrifugal analyzer. This technique is based on the procedure of Bublitz and Kennedy [J. Biol. Chem. 211, 951 (1954)]. The enzymic hydrolysis requires 10 min at 30 degrees C. Twenty-six serum triglyceride assays can be done in about 30 min. Concentration and absorbance are linearly related up to 5.0 mmol/liter, but higher concentrations can be assayed by changing conditions slightly. Day-to-day reproducibility for the method was satisfactory (CV, 2.7 to 8.4%). Comparison of this method and two other methods for triglycerides, the automated Hantzsch condensation method and a commercial enzymic method (Calbiochem), gave correlation coefficients of 0.976 and 0.990, respectively. Results are unaffected by the presence of endogenous serum ADP, pyruvic acid, phosphatases, or ATPase. | Ultraviolet spectrometry of serum triglycerides by a totally enzymic method adapted to a centrifugal analyzer. We described a micromethod for determining serum triglycerides (triacylglycerols) with the centrifugal analyzer. This technique is based on the procedure of Bublitz and Kennedy [J. Biol. Chem. 211, 951 (1954)]. The enzymic hydrolysis requires 10 min at 30 degrees C. Twenty-six serum triglyceride assays can be done in about 30 min. Concentration and absorbance are linearly related up to 5.0 mmol/liter, but higher concentrations can be assayed by changing conditions slightly. Day-to-day reproducibility for the method was satisfactory (CV, 2.7 to 8.4%). Comparison of this method and two other methods for triglycerides, the automated Hantzsch condensation method and a commercial enzymic method (Calbiochem), gave correlation coefficients of 0.976 and 0.990, respectively. Results are unaffected by the presence of endogenous serum ADP, pyruvic acid, phosphatases, or ATPase. | [
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|
PMID:12885 | Total lactate dehydrogenase and its isoenzymes in serum in the presence of penicillamine and other sulfhydryl compounds. | Toward delineation of changes in total lactate dehydrogenase (LDH) and in the distribution of LDH isoenzymes as assessed by polyacrylamide disc electrophoresis, we inbucated human and rat sera with various agents, notably sulfhydryl compounds. Although artefacts were apparent when these agents were used without preliminary adjustment of pH, we saw little alteration in total unitage when one or two volumes of serum was mixed with one volume of any of several thiols, especially penicillamine, at an initial concentration of 0.4 mol/liter and pH 7.0-7.5. Under these conditions, penicillamine caused a loss in LDH-5 after incubation for 1 h at 25 degrees C together with small decreases in mobility of the other four isoenzymes toward the anode. A zymosan region appeared below the albumin and tracking dye area. With longer periods of incubation of rat serum with penicillamine or alpha-mercaptosuccinate, a novel band in the zymogram was noted just above the LDH-4 peak. The observations are discussed in terms of allosteric effectors. | Total lactate dehydrogenase and its isoenzymes in serum in the presence of penicillamine and other sulfhydryl compounds. Toward delineation of changes in total lactate dehydrogenase (LDH) and in the distribution of LDH isoenzymes as assessed by polyacrylamide disc electrophoresis, we inbucated human and rat sera with various agents, notably sulfhydryl compounds. Although artefacts were apparent when these agents were used without preliminary adjustment of pH, we saw little alteration in total unitage when one or two volumes of serum was mixed with one volume of any of several thiols, especially penicillamine, at an initial concentration of 0.4 mol/liter and pH 7.0-7.5. Under these conditions, penicillamine caused a loss in LDH-5 after incubation for 1 h at 25 degrees C together with small decreases in mobility of the other four isoenzymes toward the anode. A zymosan region appeared below the albumin and tracking dye area. With longer periods of incubation of rat serum with penicillamine or alpha-mercaptosuccinate, a novel band in the zymogram was noted just above the LDH-4 peak. The observations are discussed in terms of allosteric effectors. | [
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PMID:12886 | Simultaneous spectrophotometry of Fe2+ and Cu2+ in serum denatured with guanidine hydrochloride. | We show how iron and copper ions may be simultaneously measured in 0.2 ml of serum after using guanidine hydrochloride to cause their release from protein. Sensitive reagents for iron (2,4,6-tripyridyl-s-triazine) and copper (disodium 2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline disulfonate) facilitate such measurement. We eliminated spectral interference between the two metal-ion complexes by selective use of pH. Results compare well with those obtained by accepted methods in which the concentrations of these ions are measured independently. | Simultaneous spectrophotometry of Fe2+ and Cu2+ in serum denatured with guanidine hydrochloride. We show how iron and copper ions may be simultaneously measured in 0.2 ml of serum after using guanidine hydrochloride to cause their release from protein. Sensitive reagents for iron (2,4,6-tripyridyl-s-triazine) and copper (disodium 2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline disulfonate) facilitate such measurement. We eliminated spectral interference between the two metal-ion complexes by selective use of pH. Results compare well with those obtained by accepted methods in which the concentrations of these ions are measured independently. | [
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PMID:12889 | N-Acetyl-beta-glucosaminidase activity in hydatidiform mole. | The N-acetyl-beta-glucosaminidase activity in hydatidiform mole is two-fold higher than that in full-term placenta. Qualitatively, the enzymes from the two tissues are similar with respect to KM values and pH optima. Both enzymes also contain a new isoenzyme form detectable by polyacrylamide gel electrophoresis. However, the molar enzyme is more susceptible to heat denaturation, presumably due to the presence of a higher level of the heat-labile isoenzyme form A in this tissue. Data are also presented incicating that the placenta is not the source of the N-acetyl-beta-glucosaminidase activity in maternal serum. | N-Acetyl-beta-glucosaminidase activity in hydatidiform mole. The N-acetyl-beta-glucosaminidase activity in hydatidiform mole is two-fold higher than that in full-term placenta. Qualitatively, the enzymes from the two tissues are similar with respect to KM values and pH optima. Both enzymes also contain a new isoenzyme form detectable by polyacrylamide gel electrophoresis. However, the molar enzyme is more susceptible to heat denaturation, presumably due to the presence of a higher level of the heat-labile isoenzyme form A in this tissue. Data are also presented incicating that the placenta is not the source of the N-acetyl-beta-glucosaminidase activity in maternal serum. | [
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PMID:12891 | Enzymatic assay of total cholesterol in serum or plasma by amperometric measurement of rate of oxygen depletion following saponification. | A method for serum or plasma cholesterol assay involving amperometric measurement of the rate of oxygen depletion in the cholesterol oxidase-catalyzed oxidation of cholesterol is described. The hydrolysis of the serum cholesterol esters is accomplished by saponification of 50 mul of sample with 0.2 ml of ethanolic KOH (1.0 mol/1) containing 0.5% Triton X-100 for 5 min at 75 degrees C. The rate of oxygen consumption in a 25-mul aliquot of this is measured with a Clark electrode in a Beckman Glucose Analyzer and the assay takes about one minute after incubation; results are read digitally on the instrument. The analyzer cell contains 1 ml of 1 M phosphate buffer, pH 7.4, with 100 mg sodium cholate/100 ml and 0.1-0.2 U cholesterol oxidase. | Enzymatic assay of total cholesterol in serum or plasma by amperometric measurement of rate of oxygen depletion following saponification. A method for serum or plasma cholesterol assay involving amperometric measurement of the rate of oxygen depletion in the cholesterol oxidase-catalyzed oxidation of cholesterol is described. The hydrolysis of the serum cholesterol esters is accomplished by saponification of 50 mul of sample with 0.2 ml of ethanolic KOH (1.0 mol/1) containing 0.5% Triton X-100 for 5 min at 75 degrees C. The rate of oxygen consumption in a 25-mul aliquot of this is measured with a Clark electrode in a Beckman Glucose Analyzer and the assay takes about one minute after incubation; results are read digitally on the instrument. The analyzer cell contains 1 ml of 1 M phosphate buffer, pH 7.4, with 100 mg sodium cholate/100 ml and 0.1-0.2 U cholesterol oxidase. | [
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|
PMID:12892 | [Rheological properties of human bronchial secretions: demonstration of proline-rich polypeptides and their role (author's transl)]. | Human bronchial secretions were examined for chemical components and rheological properties. Proline-rich polypeptides (PRP) obtained by ultrasonic treatment and by contact with a cationic resin (AG 50WX2) were purified by gel-filtration chromatography and high-voltage electrophoresis. The chemical composition of these components allowed a classification according to their proline, glycine, glutamic acid and lysine contents. Rheological experiments suggest a biological role for the PRP in the fibrillar structure of sputum. | [Rheological properties of human bronchial secretions: demonstration of proline-rich polypeptides and their role (author's transl)]. Human bronchial secretions were examined for chemical components and rheological properties. Proline-rich polypeptides (PRP) obtained by ultrasonic treatment and by contact with a cationic resin (AG 50WX2) were purified by gel-filtration chromatography and high-voltage electrophoresis. The chemical composition of these components allowed a classification according to their proline, glycine, glutamic acid and lysine contents. Rheological experiments suggest a biological role for the PRP in the fibrillar structure of sputum. | [
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|
PMID:12893 | Measurement of estradiol receptors in human breast tumors by polyacrylamide gel electrophoresis. | 1. Specific estradiol receptors in cytosols from human breast tumors were measured by discontinuous polyacrylamide gel electrophoresis. 2. Binding of estradiol to contaminating sex hormone binding globulin was clearly separated from that due to the specific receptor. 3. The amount of estradiol bound by the receptor was linear with respect to the amount of protein added to gel. 4. The estradiol receptor peak of radioactivity showed saturability and specificity characteristic of an intracellular receptor. 5. The results show that polyacrylamide gel electrophoresis can be used to quantitate specific estradiol receptors in the presence of other high affinity binding components. | Measurement of estradiol receptors in human breast tumors by polyacrylamide gel electrophoresis. 1. Specific estradiol receptors in cytosols from human breast tumors were measured by discontinuous polyacrylamide gel electrophoresis. 2. Binding of estradiol to contaminating sex hormone binding globulin was clearly separated from that due to the specific receptor. 3. The amount of estradiol bound by the receptor was linear with respect to the amount of protein added to gel. 4. The estradiol receptor peak of radioactivity showed saturability and specificity characteristic of an intracellular receptor. 5. The results show that polyacrylamide gel electrophoresis can be used to quantitate specific estradiol receptors in the presence of other high affinity binding components. | [
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|
PMID:12894 | Factors influencing lysozyme determinations by the lysoplate method. | Some factors influencing the lysoplate method have been investigated. The influences of pH, ionic strength and temperature of the gel medium can be explained by considering the influence of these factors upon the diffusion rate rather than upon the enzymatic properties of lysozyme. Salts and proteins present in a sample probably affect the results in a similar way. Although the method has a variation coefficient around 10% and thus an acceptable precision, its accuracy is variable and doubtful. The method could be clinically interesting, by discriminating lysozyme isoenzymes, or by indirectly detecting proteins associated with some disease states. | Factors influencing lysozyme determinations by the lysoplate method. Some factors influencing the lysoplate method have been investigated. The influences of pH, ionic strength and temperature of the gel medium can be explained by considering the influence of these factors upon the diffusion rate rather than upon the enzymatic properties of lysozyme. Salts and proteins present in a sample probably affect the results in a similar way. Although the method has a variation coefficient around 10% and thus an acceptable precision, its accuracy is variable and doubtful. The method could be clinically interesting, by discriminating lysozyme isoenzymes, or by indirectly detecting proteins associated with some disease states. | [
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|
PMID:12895 | Insoluble human plasma protein immunoadsorbents. Large-scale production and storage. | Methods for producing and preserving large volumes of insoluble immunoadsorbents (for removing unwated antibodies to serum proteins) from surplus blood bank plasma by glutaraldehyde were evaluated by quantitative and qualitative means using radioactive 125I and immunoelectrophoresis, respectively. Some of the factors affecting the desired physical characteristics and antibody-absorbing properties of the imjunoadsorbent studied were: plasma acidification, varying concentrations of glutaraldehyde, addition of small amounts of formalin, storage under varying conditions of temperature, and exposure to preservatives in the wet and lyophilized state for periods up to 2.5 years. The best preservation of antibody-adsorbing properties (under storage conditions) was obtained in the washed state at 4 degrees C, but good preservation was also obtained at room temperature in the presence 10% formalin and in the unwashed state at room temperature in the presence of unreacted glutaraldehyde. Lyophilization destroyed about 70% of an adsorbent's activity. | Insoluble human plasma protein immunoadsorbents. Large-scale production and storage. Methods for producing and preserving large volumes of insoluble immunoadsorbents (for removing unwated antibodies to serum proteins) from surplus blood bank plasma by glutaraldehyde were evaluated by quantitative and qualitative means using radioactive 125I and immunoelectrophoresis, respectively. Some of the factors affecting the desired physical characteristics and antibody-absorbing properties of the imjunoadsorbent studied were: plasma acidification, varying concentrations of glutaraldehyde, addition of small amounts of formalin, storage under varying conditions of temperature, and exposure to preservatives in the wet and lyophilized state for periods up to 2.5 years. The best preservation of antibody-adsorbing properties (under storage conditions) was obtained in the washed state at 4 degrees C, but good preservation was also obtained at room temperature in the presence 10% formalin and in the unwashed state at room temperature in the presence of unreacted glutaraldehyde. Lyophilization destroyed about 70% of an adsorbent's activity. | [
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|
PMID:12896 | Stimulation of growth hormone release by luteinizing hormone-releasing hormone and melanocyte-stimulating hormone-release inhibiting hormone in the hypophysectomized rat bearing an ectopic pituitary. | Intrajugular administration of LHRH (0-6 and 1-2 mug) in hypophysectomized rats which received renal grafts of anterior pituitary induced a small but significant rise in plasma GH 5 and 10 min post-treatment. LHRH, at the same dose levels, was ineffective in weight-matched intact controls. MIF, at the dose of 1-2 mug, induced a slight GH rise 5 min after treatment in hypophysectomized trasnplanted rats, while it was ineffective in intact controls. Unlike the two hypothalamic peptides, alpha-MSH (0-6 and 1-2 mug) was ineffective as a GH-releaser in both transplanted and intact rats. | Stimulation of growth hormone release by luteinizing hormone-releasing hormone and melanocyte-stimulating hormone-release inhibiting hormone in the hypophysectomized rat bearing an ectopic pituitary. Intrajugular administration of LHRH (0-6 and 1-2 mug) in hypophysectomized rats which received renal grafts of anterior pituitary induced a small but significant rise in plasma GH 5 and 10 min post-treatment. LHRH, at the same dose levels, was ineffective in weight-matched intact controls. MIF, at the dose of 1-2 mug, induced a slight GH rise 5 min after treatment in hypophysectomized trasnplanted rats, while it was ineffective in intact controls. Unlike the two hypothalamic peptides, alpha-MSH (0-6 and 1-2 mug) was ineffective as a GH-releaser in both transplanted and intact rats. | [
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|
PMID:12898 | Studies on the physico-chemical characteristics of polymorph migration stimulator. | Polymorph migration stimulator is a supernatant factor produced by the interaction between glucocorticosteroids and human blood monocytes in culture. Studies on the physical characteristics of this factor show that it is soluble and stable at high and low temperatures. Its activity is reduced by acid and alkali treatment and destroyed by the proteolytic enzyme protease. Experiments involving dialysis, ultrafiltration and Sephadex G-100 gell filtration indicate that the molecular weight of the polymorph migration stimulator is between 12,000 and 15,000. It is suggested that this factor may mediate the anti-inflammatory effects of glucocorticosteroids on phagocytic cells. | Studies on the physico-chemical characteristics of polymorph migration stimulator. Polymorph migration stimulator is a supernatant factor produced by the interaction between glucocorticosteroids and human blood monocytes in culture. Studies on the physical characteristics of this factor show that it is soluble and stable at high and low temperatures. Its activity is reduced by acid and alkali treatment and destroyed by the proteolytic enzyme protease. Experiments involving dialysis, ultrafiltration and Sephadex G-100 gell filtration indicate that the molecular weight of the polymorph migration stimulator is between 12,000 and 15,000. It is suggested that this factor may mediate the anti-inflammatory effects of glucocorticosteroids on phagocytic cells. | [
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|
PMID:12899 | The immune response in cirrhotic rats. Antigen distribution, humoral immunity, cell-mediated immunity and splenic suppressor cell activity. | The immunological disturbances occurring as a result of liver disease have been studied in an animal model of cirrhosis. The mononuclear phagocytic cells of the normal liver phagocytose large amounts of antigen irrespective of whether that antigen is injected directly into the portal or into the systemic circulations. The liver therefore acts as a filter 'in series' and 'in parallel' with the spleen and reduces the immunogenicity of antigens entering the organism by either of these routes. In rats with hepatic cirrhosis, there is a reduction in the capacity of the liver to phagocytose the flagellar antigen of Salmonella adelaide. This results in increased stimulation of splenic lymphoid tissue and in an increased antibody response to this thymus-independent antigen. The increased antigenic stimulus to the spleen may also be responsible for the increased suppressor-cell activity which has been demonstrated in these rats, and may be the mechanism of the diminished cell-mediated immune response both in this animal model of cirrhosis and in the human disease state. These studies suggest that many of the immunological disturbances associated with chronic liver disease may be the result of maldistribution of antigen occurring because of impaired hepatic phagocytic capacity. | The immune response in cirrhotic rats. Antigen distribution, humoral immunity, cell-mediated immunity and splenic suppressor cell activity. The immunological disturbances occurring as a result of liver disease have been studied in an animal model of cirrhosis. The mononuclear phagocytic cells of the normal liver phagocytose large amounts of antigen irrespective of whether that antigen is injected directly into the portal or into the systemic circulations. The liver therefore acts as a filter 'in series' and 'in parallel' with the spleen and reduces the immunogenicity of antigens entering the organism by either of these routes. In rats with hepatic cirrhosis, there is a reduction in the capacity of the liver to phagocytose the flagellar antigen of Salmonella adelaide. This results in increased stimulation of splenic lymphoid tissue and in an increased antibody response to this thymus-independent antigen. The increased antigenic stimulus to the spleen may also be responsible for the increased suppressor-cell activity which has been demonstrated in these rats, and may be the mechanism of the diminished cell-mediated immune response both in this animal model of cirrhosis and in the human disease state. These studies suggest that many of the immunological disturbances associated with chronic liver disease may be the result of maldistribution of antigen occurring because of impaired hepatic phagocytic capacity. | [
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|
PMID:12900 | Evaluation of the prison inmate as a subject in drug assessment. | The reasons for exclusion of prisoners from research studies on drugs were based mostly on a relatively limited group of laboratory parameters which could have been detected using a simple battery of screening tests. The answers to a medical history form added little to the evaluation of either the prisoner or student groups, were probably very unreliable, and could be just as well confined to a few selected questions regarding drug history as a matter of record. Students gave appropriate responses to a mood scale measurement test while prisoners characteristically did not comply. Because of a combination of various institutional and sociological factors, prisoners probably represent a special subgroup of research volunteers whose health status may not be representative of the total "healthy" population. They are unlikely to give accurate or reliable responses in testing situations which rely upon reporting of the subjective effects of drugs with regard to tolerance or pharmacologic effect. Studies of investigational drugs where the likelihood of potentiaal risk is significant should be avoided in such populations unless compliance has been assessed adequately. | Evaluation of the prison inmate as a subject in drug assessment. The reasons for exclusion of prisoners from research studies on drugs were based mostly on a relatively limited group of laboratory parameters which could have been detected using a simple battery of screening tests. The answers to a medical history form added little to the evaluation of either the prisoner or student groups, were probably very unreliable, and could be just as well confined to a few selected questions regarding drug history as a matter of record. Students gave appropriate responses to a mood scale measurement test while prisoners characteristically did not comply. Because of a combination of various institutional and sociological factors, prisoners probably represent a special subgroup of research volunteers whose health status may not be representative of the total "healthy" population. They are unlikely to give accurate or reliable responses in testing situations which rely upon reporting of the subjective effects of drugs with regard to tolerance or pharmacologic effect. Studies of investigational drugs where the likelihood of potentiaal risk is significant should be avoided in such populations unless compliance has been assessed adequately. | [
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|
PMID:12913 | The intrinsic pKa-values of functional groups in enzymes: improper deductions from the pH-dependence of steady-state parameters. | The assumptions implicit in the deductions made from the pH-dependence of rate measurements of enzyme-catalyzed reactions are summarized, and the limitations of such determinations are discussed nonalgebraically. The following types of pH-profile are considered (in order of increasing utility): pH-"activity" curves at fixed [S] o;pH-dependences of kcat, Km, kcat/Km, and Ki; pH-dependences of kmodification (by specific reagents) and of competitive labeling (by nonspecific reagents); pH-dependences of elementary steps; and the direct observation of a titrating group. | The intrinsic pKa-values of functional groups in enzymes: improper deductions from the pH-dependence of steady-state parameters. The assumptions implicit in the deductions made from the pH-dependence of rate measurements of enzyme-catalyzed reactions are summarized, and the limitations of such determinations are discussed nonalgebraically. The following types of pH-profile are considered (in order of increasing utility): pH-"activity" curves at fixed [S] o;pH-dependences of kcat, Km, kcat/Km, and Ki; pH-dependences of kmodification (by specific reagents) and of competitive labeling (by nonspecific reagents); pH-dependences of elementary steps; and the direct observation of a titrating group. | [
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|
PMID:12914 | Interferon: effects on the immune response and the mechanism of activation of the cellular response. | The discovery of interferon in 1957 by Drs. Isaacs and Lindenmann led to major revisions in the concepts of man's defenses against viral infections. There are at least two types of interferon. Along with their antiviral properties, they have recently been shown to exert a suppressive effect on the humoral and cellular immune response; they affect both B and T lymphocytes. A variety of substances, including virus, polyribonucleotides, and mitogens for T lymphocytes, are good interferon inducers. T lymphocytes seem to be necessary for these inducers to exert their immunosuppressive effects. The immunosuppressive effects of interferon inducers suggests that interferons may be mediators of suppressor T lymphocyte effects. In the virus system, interferon does not exert its antiviral effects by direct action on the virus, but rather derepresses a cell gene that results in the production of an antiviral protein. This antiviral protein is probably the mediator of inhibition of virus replication. This is a complex sequence of events that results in the interaction of interferon with the cell membrane and the resulting production of the antiviral state in the cell. This review will examine the various steps of this involved process. | Interferon: effects on the immune response and the mechanism of activation of the cellular response. The discovery of interferon in 1957 by Drs. Isaacs and Lindenmann led to major revisions in the concepts of man's defenses against viral infections. There are at least two types of interferon. Along with their antiviral properties, they have recently been shown to exert a suppressive effect on the humoral and cellular immune response; they affect both B and T lymphocytes. A variety of substances, including virus, polyribonucleotides, and mitogens for T lymphocytes, are good interferon inducers. T lymphocytes seem to be necessary for these inducers to exert their immunosuppressive effects. The immunosuppressive effects of interferon inducers suggests that interferons may be mediators of suppressor T lymphocyte effects. In the virus system, interferon does not exert its antiviral effects by direct action on the virus, but rather derepresses a cell gene that results in the production of an antiviral protein. This antiviral protein is probably the mediator of inhibition of virus replication. This is a complex sequence of events that results in the interaction of interferon with the cell membrane and the resulting production of the antiviral state in the cell. This review will examine the various steps of this involved process. | [
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|
PMID:12915 | A test of the concept of "underlying depressive illness" in the treatment of anxiety states. | In order to test the validity of the concept of anxiety states masking an underlying depressive illness, patients clinically diagnosed as suffering from anxiety or tension states were treated on a random double-blind basis for 4 weeks with either a pure anxiolytic, lorazepam, or an anxiolytic/antidepressant preparation, fluphenazine with nortriptyline. Patients' self-ratings were very similar to the physicians' ratings which showed that fluphenazine/nortriptyline was associated with significantly greater overall improvement(p less than 0.01), as well as significantly greater improvements in the group of symptoms specifically related to depression(p less than 0.05). These results suggest that a depressive element is present in an appreciable proportion of patients presenting with apparent anxiety states, and antidepressant as well as anxiolytic treatment is required. Patients selected on the basis that they had improved satisfactorily at the end of the 4-weeks' treatment were followed up for a further 3 months without medication, and the relapse rate was 24%, irrespective of previous treatment. More of the patients treated with lorazepam had to be excluded from the follow-up because of failure to improve, and these probably represented the proportion (19%) of this population with an appreciable depressive element to their illness. | A test of the concept of "underlying depressive illness" in the treatment of anxiety states. In order to test the validity of the concept of anxiety states masking an underlying depressive illness, patients clinically diagnosed as suffering from anxiety or tension states were treated on a random double-blind basis for 4 weeks with either a pure anxiolytic, lorazepam, or an anxiolytic/antidepressant preparation, fluphenazine with nortriptyline. Patients' self-ratings were very similar to the physicians' ratings which showed that fluphenazine/nortriptyline was associated with significantly greater overall improvement(p less than 0.01), as well as significantly greater improvements in the group of symptoms specifically related to depression(p less than 0.05). These results suggest that a depressive element is present in an appreciable proportion of patients presenting with apparent anxiety states, and antidepressant as well as anxiolytic treatment is required. Patients selected on the basis that they had improved satisfactorily at the end of the 4-weeks' treatment were followed up for a further 3 months without medication, and the relapse rate was 24%, irrespective of previous treatment. More of the patients treated with lorazepam had to be excluded from the follow-up because of failure to improve, and these probably represented the proportion (19%) of this population with an appreciable depressive element to their illness. | [
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|
PMID:12923 | Negative inotropic effect of lidocaine in patients with coronary arterial disease and normal subjects. | The effect of administration of lidocaine on left ventricular performance was studied using systolic time intervals in nine normal subjects, eight patients with stable angina, and 15 patients with acute myocardial infarction. The greatest response in systolic time intervals occurred at three minutes after intravenous injection of lidocaine (100 mg), with values returning to baseline at 10 to 15 minutes. Administration of lidocaine produced a significant prolongation of the preejection period (PEP) corrected for heart rate in all groups and a prolongation of the ratio of PEP to left ventricular ejection time (PEP/LVET) in patients with angina. The group with acute myocardial infarction exhibited a hyperadrenergic state, as shown by a short baseline QS2I. The QS I was lengthened by administration of lidocaine in all groups, but this was more profound in those with acute myocardial infarction. These changes in systolic time intervals were still present at two hours after injection in six patients with acute myocardial infarction in whom an infusion of lidocaine followed the initial bolus. The effect of administering lidocaine after intravenous injection of propranolol (5 mg) was also studied in six normal subjects. Although propranolol therapy along prolonged the PEP/LVET, a further significant prolongation followed subsequent injection of lidocaine. | Negative inotropic effect of lidocaine in patients with coronary arterial disease and normal subjects. The effect of administration of lidocaine on left ventricular performance was studied using systolic time intervals in nine normal subjects, eight patients with stable angina, and 15 patients with acute myocardial infarction. The greatest response in systolic time intervals occurred at three minutes after intravenous injection of lidocaine (100 mg), with values returning to baseline at 10 to 15 minutes. Administration of lidocaine produced a significant prolongation of the preejection period (PEP) corrected for heart rate in all groups and a prolongation of the ratio of PEP to left ventricular ejection time (PEP/LVET) in patients with angina. The group with acute myocardial infarction exhibited a hyperadrenergic state, as shown by a short baseline QS2I. The QS I was lengthened by administration of lidocaine in all groups, but this was more profound in those with acute myocardial infarction. These changes in systolic time intervals were still present at two hours after injection in six patients with acute myocardial infarction in whom an infusion of lidocaine followed the initial bolus. The effect of administering lidocaine after intravenous injection of propranolol (5 mg) was also studied in six normal subjects. Although propranolol therapy along prolonged the PEP/LVET, a further significant prolongation followed subsequent injection of lidocaine. | [
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|
PMID:12926 | Fosfomycin: Absorption and excretion. | Summarized results of absorption and excretion of fosfomycin after oral and intravenous administration obtained from hospitals and institutions in Japan are reported. Fosfomycin was rapidly absorbed and excreted from the urine once it was distributed, the 6-hour urinary recovery reaching about 20% in the case of oral administration and 90% in the case of intravenous injection. These phenomena are almost the same as those previously published. Higher concentration was noticed in the kidney, which gradually decreased according to the fall of the blood level. The blood level reached its maximum of about 3 mug/ml after oral administration to adults at a dose of 500 mg. | Fosfomycin: Absorption and excretion. Summarized results of absorption and excretion of fosfomycin after oral and intravenous administration obtained from hospitals and institutions in Japan are reported. Fosfomycin was rapidly absorbed and excreted from the urine once it was distributed, the 6-hour urinary recovery reaching about 20% in the case of oral administration and 90% in the case of intravenous injection. These phenomena are almost the same as those previously published. Higher concentration was noticed in the kidney, which gradually decreased according to the fall of the blood level. The blood level reached its maximum of about 3 mug/ml after oral administration to adults at a dose of 500 mg. | [
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|
PMID:12927 | Fosfomycin in pneumococcal meningitis. | A study has been made of 12 patients with pneumococcal meningitis with ages ranging from 12 months to 59 years. In all cases pneumococcus was isolated in the cerebrospinal fluid (CSF). Seventeen pneumococci were studied for their sensitivity to fosfomycin, ampicillin and gentamicin, including their MIC. All were sensitive to fosfomycin and ampicillin and 7 to gentamicin. On the other hand there has also been made a study of the interaction between fosfomycin plus ampicillin and fosfomycin plus gentamicin. The concentration of antibiotics in plasma and CSF had been determined. The association of fosfomycin to penicillin or ampicillin was also studied in some cases, depending on whether the patient was younger or older than 2 years, and in other cases, the association of fosfomycin with gentamicin. The concentrations of antibiotics in the CSF varied according to the stage of evolution of the meningitis. As regards clinical results, 10 cures and 2 failures have been obtained. The pneumococcus was eradicated from the CSF in all cases, including the two failures, in the control carried out 2-3 days after beginning of treatment, the rest of the analytical data of the CSF became normal within 5 and 17 days treatment. | Fosfomycin in pneumococcal meningitis. A study has been made of 12 patients with pneumococcal meningitis with ages ranging from 12 months to 59 years. In all cases pneumococcus was isolated in the cerebrospinal fluid (CSF). Seventeen pneumococci were studied for their sensitivity to fosfomycin, ampicillin and gentamicin, including their MIC. All were sensitive to fosfomycin and ampicillin and 7 to gentamicin. On the other hand there has also been made a study of the interaction between fosfomycin plus ampicillin and fosfomycin plus gentamicin. The concentration of antibiotics in plasma and CSF had been determined. The association of fosfomycin to penicillin or ampicillin was also studied in some cases, depending on whether the patient was younger or older than 2 years, and in other cases, the association of fosfomycin with gentamicin. The concentrations of antibiotics in the CSF varied according to the stage of evolution of the meningitis. As regards clinical results, 10 cures and 2 failures have been obtained. The pneumococcus was eradicated from the CSF in all cases, including the two failures, in the control carried out 2-3 days after beginning of treatment, the rest of the analytical data of the CSF became normal within 5 and 17 days treatment. | [
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|
PMID:12928 | Antimicrobial activity of tibezonium (TBZ). | The activity in vitro of tibezonium (Rec 15-0691), a new 1,5-benzodiazepine derivative, has been investigated. The drug was found active especially against Streptococcus, Diplococcus and Corynebacterium strains which are agents of oropharyngeal diseases. The activity of tibezonium was pH dependent against Staphylococcus aureus SG 511 and Streptococcus pyogenes 821 (at pH 8.0-8.5 It was more active) and the presence of horse serum provoked a small decrease of the antimicrobial properties. No interference on the activity of the tibezonium has been found in presence of smokers and non-smokers saliva. | Antimicrobial activity of tibezonium (TBZ). The activity in vitro of tibezonium (Rec 15-0691), a new 1,5-benzodiazepine derivative, has been investigated. The drug was found active especially against Streptococcus, Diplococcus and Corynebacterium strains which are agents of oropharyngeal diseases. The activity of tibezonium was pH dependent against Staphylococcus aureus SG 511 and Streptococcus pyogenes 821 (at pH 8.0-8.5 It was more active) and the presence of horse serum provoked a small decrease of the antimicrobial properties. No interference on the activity of the tibezonium has been found in presence of smokers and non-smokers saliva. | [
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|
PMID:12930 | Effects of estradiol-17beta on the induction of gonadotropin release by electrical stimulation of the hypothalamus in rhesus monkeys. | Serum LH and FSH were measured at 60, 30, and 0 min before, at 5, 15, and 30 min during, and at 10, 45, and 90 min after bilateral electrical stimulation (ES) of various hypothalamic regions in 12 unanesthetized ovariectomized rhesus monkeys. ES of the arcuate-ventromedial nuclei (medial basal hypothalamus; MBH) induced a prompt increase in serum LH that persisted throughout stimulation and returned to basal levels within 90 min thereafter. FSH was also released, but the release was slower and less dramatic than that of LH. Sham stimulation (0muA) caused no change in serum gonadotropins. The amount of LH released after MBH-ES depended upon current strength (1.0 mA greater than 0,5 or 0.7 mA). Three sequential 30-min MBH-ES trials at 90-min intervals induced comparable LH responses and 3 h of continuous MBH-ES maintained elevated serum LH levels throughout the stimulation period, suggesting that these stimulation period, suggesting that these stimulation parameters did not completely deplete pituitary stores of releasable LH. The character of the LH response was similar in individual monkeys through 3 to 24 trials during 4 to 18 months. Comparisons were made of the effects of estradiol-17beta (E2) treatment at different doses and for different intervals of time before MBH-ES. ES-induced LH release was not affected by low levels (25 and 55 pg/ml) ofE2 for 48 h, but was reduced by higher E2 concentrations (100 or 230 pg/ml). E2 concentrations of 100 pg/ml had no effect at 24 h, but reduced MBH-ES-activated LH release at 48 to 96 h; the degree of depression was time-related (48 h less than 72 h less than 96 h). ES of the preoptic-suprachiasmatic region (rostral hypothalamus; RH) in non-E2-treated monkeys also released LH, but this increase was less than after MBH-ES. FSH release was not measurable after RH-ES. In contrast to the depressed LH response to MBH-ES after 48 h of E2 (100 pg/ml), the response to RH-ES was not inhibited by this E2 regimen. These data suggest that ES of an area extending caudally from the rostral hypothalamus to the arcurate-median eminence region will evoke LH release in rhesus monkeys. This electrically induced gonadotropin release was affected by administration of physiological levels of E2 but the nature of effect depended on the specific region stimulated: distinct inhibition of the gonadotropic response to MBH-ES and slight facilitation of the response to RH-ES. | Effects of estradiol-17beta on the induction of gonadotropin release by electrical stimulation of the hypothalamus in rhesus monkeys. Serum LH and FSH were measured at 60, 30, and 0 min before, at 5, 15, and 30 min during, and at 10, 45, and 90 min after bilateral electrical stimulation (ES) of various hypothalamic regions in 12 unanesthetized ovariectomized rhesus monkeys. ES of the arcuate-ventromedial nuclei (medial basal hypothalamus; MBH) induced a prompt increase in serum LH that persisted throughout stimulation and returned to basal levels within 90 min thereafter. FSH was also released, but the release was slower and less dramatic than that of LH. Sham stimulation (0muA) caused no change in serum gonadotropins. The amount of LH released after MBH-ES depended upon current strength (1.0 mA greater than 0,5 or 0.7 mA). Three sequential 30-min MBH-ES trials at 90-min intervals induced comparable LH responses and 3 h of continuous MBH-ES maintained elevated serum LH levels throughout the stimulation period, suggesting that these stimulation period, suggesting that these stimulation parameters did not completely deplete pituitary stores of releasable LH. The character of the LH response was similar in individual monkeys through 3 to 24 trials during 4 to 18 months. Comparisons were made of the effects of estradiol-17beta (E2) treatment at different doses and for different intervals of time before MBH-ES. ES-induced LH release was not affected by low levels (25 and 55 pg/ml) ofE2 for 48 h, but was reduced by higher E2 concentrations (100 or 230 pg/ml). E2 concentrations of 100 pg/ml had no effect at 24 h, but reduced MBH-ES-activated LH release at 48 to 96 h; the degree of depression was time-related (48 h less than 72 h less than 96 h). ES of the preoptic-suprachiasmatic region (rostral hypothalamus; RH) in non-E2-treated monkeys also released LH, but this increase was less than after MBH-ES. FSH release was not measurable after RH-ES. In contrast to the depressed LH response to MBH-ES after 48 h of E2 (100 pg/ml), the response to RH-ES was not inhibited by this E2 regimen. These data suggest that ES of an area extending caudally from the rostral hypothalamus to the arcurate-median eminence region will evoke LH release in rhesus monkeys. This electrically induced gonadotropin release was affected by administration of physiological levels of E2 but the nature of effect depended on the specific region stimulated: distinct inhibition of the gonadotropic response to MBH-ES and slight facilitation of the response to RH-ES. | [
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|
PMID:12931 | Gonadotropin secretion in cryptorchid and castrate rams and the acute effects of exogenous steroid treatment. | Gonadotropin secretion in cryptorchid and castrate rams and the acutve been determined. Rams made cryptorchid at 6 weeks of age had increased serum levels of luteinizing hormone (LH) and follicle stimulating hormone (FSH) when determined at 9 months of age. These levels approached those of the castrate animal; and yet serum levels of testosterone (T) were unchanged. Even though mean serum LH concentrations were elevated sixfold to eightfold over those of intact ram levels, a temporal relationship between this hormone and T was observed similar to that reported in the intact ram. Intramuscular injections of dihydrotestosterone had no effect on circulating levels of LH or FSH in either cryptorchid or castrate rams, whereas T effectively reduced these gonadotropins in castrate but not in cryptorchid rams. Only estradiol-17beta (E2) was effective in both cryptorchid and castrate rams. Estradiol was a potent inhibitor of LH secretion; however, its effect on FSH levels was less dramatic. This suggests that testicular products other than E2 may be important in the regulation of FSH production and/or release. Importantly, the inhibition of LH secretion lasted less than 12 h; whereas, the negative effects of E2 on FSH secretion lasted 72 to 144 h. In conclusion, results from this study show that T is not the single factor responsible for regulation of LH and FSH secretion in male sheep. Estradiol may be an important regulator of gonadotropin secretion, but 5alpha-reduction plays no apparent role in this process. | Gonadotropin secretion in cryptorchid and castrate rams and the acute effects of exogenous steroid treatment. Gonadotropin secretion in cryptorchid and castrate rams and the acutve been determined. Rams made cryptorchid at 6 weeks of age had increased serum levels of luteinizing hormone (LH) and follicle stimulating hormone (FSH) when determined at 9 months of age. These levels approached those of the castrate animal; and yet serum levels of testosterone (T) were unchanged. Even though mean serum LH concentrations were elevated sixfold to eightfold over those of intact ram levels, a temporal relationship between this hormone and T was observed similar to that reported in the intact ram. Intramuscular injections of dihydrotestosterone had no effect on circulating levels of LH or FSH in either cryptorchid or castrate rams, whereas T effectively reduced these gonadotropins in castrate but not in cryptorchid rams. Only estradiol-17beta (E2) was effective in both cryptorchid and castrate rams. Estradiol was a potent inhibitor of LH secretion; however, its effect on FSH levels was less dramatic. This suggests that testicular products other than E2 may be important in the regulation of FSH production and/or release. Importantly, the inhibition of LH secretion lasted less than 12 h; whereas, the negative effects of E2 on FSH secretion lasted 72 to 144 h. In conclusion, results from this study show that T is not the single factor responsible for regulation of LH and FSH secretion in male sheep. Estradiol may be an important regulator of gonadotropin secretion, but 5alpha-reduction plays no apparent role in this process. | [
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|
PMID:12932 | Variants of HTC cells with low tyrosine aminotransferinase inducibility and apparently normal glucorticoid receptors. | Variants of HTC cells showing little or no induction of tyrosine aminotransferase in response to glucorticoids have been isolated by repeated cloning without deliberate selective pressures. In this paper, the derivation and some properties of these cells, compared with both high-inducing clones and wild-type cells, are described. The non-inducing cells all grew well, and were not induced even by unusually high concentrations of steroid. The enzyme activity had a normal half-life of decay and heat inactivation. It was inactivated by antiserum against authentic tyrosine aminotransferase, and no evidence for antigenically active, enzymatically inactive enzyme was found. No great variability was seen in the few other enzyme activities tested. Glucorticoid receptors were present in all the clones, With respect to concentration, cellular uptake, cell-free binding to nuclei and intracellular localiztion, no differences were found between the receptors of inducible and non-inducible clones. These are the first cells derived from an inducible type to be characterized as having normal receptor while becoming steroid resistant. They appear to be blocked in a late step of the response to the steroid, and therefore may prove useful in analyzing these later steps. | Variants of HTC cells with low tyrosine aminotransferinase inducibility and apparently normal glucorticoid receptors. Variants of HTC cells showing little or no induction of tyrosine aminotransferase in response to glucorticoids have been isolated by repeated cloning without deliberate selective pressures. In this paper, the derivation and some properties of these cells, compared with both high-inducing clones and wild-type cells, are described. The non-inducing cells all grew well, and were not induced even by unusually high concentrations of steroid. The enzyme activity had a normal half-life of decay and heat inactivation. It was inactivated by antiserum against authentic tyrosine aminotransferase, and no evidence for antigenically active, enzymatically inactive enzyme was found. No great variability was seen in the few other enzyme activities tested. Glucorticoid receptors were present in all the clones, With respect to concentration, cellular uptake, cell-free binding to nuclei and intracellular localiztion, no differences were found between the receptors of inducible and non-inducible clones. These are the first cells derived from an inducible type to be characterized as having normal receptor while becoming steroid resistant. They appear to be blocked in a late step of the response to the steroid, and therefore may prove useful in analyzing these later steps. | [
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|
PMID:12933 | Differential effect of hypophysectomy on the synthesis of beta-glucuronidase and other androgen-inducible enzymes in mouse kidney. | The levels of several androgen responsive enzymes including beta-glucuronidase, alcohol dehydrogenase, D-amino acid oxidase and arginase, were compared in kidneys of normal and hypophysectomized female mice after treatment with testosterone. While hypophysectomy did not alter the basal level of glucuronidase, the androgen-mediated accumulation of kidney beta-glucuronidase was greatly decreased in hypophysectomized mice. Measurements of the rate of synthesis of glucuronidase showed that after androgen treatment the enzyme was synthesized in kidney of hypophysectomized mice at only 5% the normal rate. Glucuronidase activity in seven other organs was not appreciably affected by treatment with androgens or by hypophysectomy. Unlike the effect of hypophysectomy on kidney glucuronidase, there was no reduction in the accumulation of alcohol dehydrogenase or D-amino acid oxidase in kidney of hypophysectomized mice after androgen treatment. Hypophysectomy caused a large reduction in kidney arginase activity. However, subsequent administration of testosterone restored much of this activity. It is concluded that there are at least two mechanisms by which androgens increase enzyme activity in kidney. The normal increase in activity or rate of synthesis of beta-glucuronidase following androgen administration requires pituitary hormones and/or products of these hormones, while the increase in activity of enzymes like alcohol dehydrogenase and D-amino acid oxidase does not require pituitary hormones. | Differential effect of hypophysectomy on the synthesis of beta-glucuronidase and other androgen-inducible enzymes in mouse kidney. The levels of several androgen responsive enzymes including beta-glucuronidase, alcohol dehydrogenase, D-amino acid oxidase and arginase, were compared in kidneys of normal and hypophysectomized female mice after treatment with testosterone. While hypophysectomy did not alter the basal level of glucuronidase, the androgen-mediated accumulation of kidney beta-glucuronidase was greatly decreased in hypophysectomized mice. Measurements of the rate of synthesis of glucuronidase showed that after androgen treatment the enzyme was synthesized in kidney of hypophysectomized mice at only 5% the normal rate. Glucuronidase activity in seven other organs was not appreciably affected by treatment with androgens or by hypophysectomy. Unlike the effect of hypophysectomy on kidney glucuronidase, there was no reduction in the accumulation of alcohol dehydrogenase or D-amino acid oxidase in kidney of hypophysectomized mice after androgen treatment. Hypophysectomy caused a large reduction in kidney arginase activity. However, subsequent administration of testosterone restored much of this activity. It is concluded that there are at least two mechanisms by which androgens increase enzyme activity in kidney. The normal increase in activity or rate of synthesis of beta-glucuronidase following androgen administration requires pituitary hormones and/or products of these hormones, while the increase in activity of enzymes like alcohol dehydrogenase and D-amino acid oxidase does not require pituitary hormones. | [
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PMID:12934 | Neonatal treatment with sex steroids: relationship between the uterotropic response and the estrogen "receptor" in prepubertal rats. | We tested the hypothesis that neonatal treatment of rats with testosterone propionate (TP) or estradiol benzoate (EB) reduces the uterine responsiveness to estradiol and reduces the concentration of estrogen "receptor" before puberty, and that both of these events precede the onset of the persistent estrus syndrome. Thre-day-old female rats were injected with 100 mug EB, TP or sesame oil (controls) and at 23 and 31 days of age (before the onset of puberty) the uterine cytoplasmic content of specific 8S estradiol-binding protein was measured by sucrose density gradients. Binding by the nuclear fraction was also measured utilizing an exchange assay. In a subgroup of rats also treated neonatally, 2 mug/kg body weight estradiol-17beta was injected at 22 and 30 days of age and uterine wiights were measured as a test for uterine responsiveness. At 23 and 31 days of age the uterine cytoplasmic 8S estrogen "receptor" was significantly reduced in the EB-treated rats, but the uterotropic response to estradiol was blocked only in the 23 day old rats; the uterine response at 31 days was slightly, but not significantly, reduced. In contrast, neonatally administered TP had no effect on either the concentration of cytoplasmic estradiol-binding sites or uterine responsiveness. Nuclear binding of estradiol was unaffected by either TP or EB treatment in both age groups. In a futher experiment in rats ovariectomized at 9 days of age, those treated neonatally with EB had significantly smaller uteri than their untreated ovariectomized controls, thus providing indirect evidence for an extravarian factor affected by neonatal treatment. These data support the hypothesis that neonatal EB treatment may directly inhibit the synthesis or replenishment of the 8S estradiol "receptor" prior to the development of the persistent estrus syndrome (persistent vaginal estrus, anovulation and polycystic ovaries). A neonatally-induced neuroendocrine disorder affecting steroid secretion by the ovary or adrenal may also exist prepubertally to account for the uterine defects. | Neonatal treatment with sex steroids: relationship between the uterotropic response and the estrogen "receptor" in prepubertal rats. We tested the hypothesis that neonatal treatment of rats with testosterone propionate (TP) or estradiol benzoate (EB) reduces the uterine responsiveness to estradiol and reduces the concentration of estrogen "receptor" before puberty, and that both of these events precede the onset of the persistent estrus syndrome. Thre-day-old female rats were injected with 100 mug EB, TP or sesame oil (controls) and at 23 and 31 days of age (before the onset of puberty) the uterine cytoplasmic content of specific 8S estradiol-binding protein was measured by sucrose density gradients. Binding by the nuclear fraction was also measured utilizing an exchange assay. In a subgroup of rats also treated neonatally, 2 mug/kg body weight estradiol-17beta was injected at 22 and 30 days of age and uterine wiights were measured as a test for uterine responsiveness. At 23 and 31 days of age the uterine cytoplasmic 8S estrogen "receptor" was significantly reduced in the EB-treated rats, but the uterotropic response to estradiol was blocked only in the 23 day old rats; the uterine response at 31 days was slightly, but not significantly, reduced. In contrast, neonatally administered TP had no effect on either the concentration of cytoplasmic estradiol-binding sites or uterine responsiveness. Nuclear binding of estradiol was unaffected by either TP or EB treatment in both age groups. In a futher experiment in rats ovariectomized at 9 days of age, those treated neonatally with EB had significantly smaller uteri than their untreated ovariectomized controls, thus providing indirect evidence for an extravarian factor affected by neonatal treatment. These data support the hypothesis that neonatal EB treatment may directly inhibit the synthesis or replenishment of the 8S estradiol "receptor" prior to the development of the persistent estrus syndrome (persistent vaginal estrus, anovulation and polycystic ovaries). A neonatally-induced neuroendocrine disorder affecting steroid secretion by the ovary or adrenal may also exist prepubertally to account for the uterine defects. | [
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PMID:12936 | Lack of glucose effect on the induction of 5-aminolevulinate synthetase and tyrosine aminotransferase in the isolated perfused rat liver. | In the isolated perfused rat liver, both 5-aminolevulinate synthetase and tyrosine aminotransferase were induced by the addition of 3.5 mmol/l allylisopropylacetamide and 58 mumol/l dexamethasone to the perfusion medium. Glucose (40 mmol/l) did not affect either the induction of these enzymes or the intrahepatic level of cyclic AMP. The results suggest that the glucose effect on the induction of 5-aminolevulinate synthetase and tyrosine aminotransferase in vivo is mediated by extrahepatic factors. | Lack of glucose effect on the induction of 5-aminolevulinate synthetase and tyrosine aminotransferase in the isolated perfused rat liver. In the isolated perfused rat liver, both 5-aminolevulinate synthetase and tyrosine aminotransferase were induced by the addition of 3.5 mmol/l allylisopropylacetamide and 58 mumol/l dexamethasone to the perfusion medium. Glucose (40 mmol/l) did not affect either the induction of these enzymes or the intrahepatic level of cyclic AMP. The results suggest that the glucose effect on the induction of 5-aminolevulinate synthetase and tyrosine aminotransferase in vivo is mediated by extrahepatic factors. | [
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|
PMID:12938 | Inhibition of L-asparagine synthetase by mucochloric and mucobromic acids. | Mucochloric and mucobromic acids are powerful inhibitors of tumoral and pancreatic L-asparagine synthetases. Two nitrogen donors, L-glutamine and ammonia, can be used by these enzymes; at a concentration of 1 mmol/l, mucochloric and mucobromic acids preferentially inhibit the utilization of ammonia as opposed to L-glutamine in vitro. Using the tumoral enzyme, kinetic analysis revealed that mucochloric acid produced inhibition which was apparently noncompetitive with ammonia but competitive with L-glutamine. In molar excess, L-glutamine and dithiothreitol effectively antagonized such inhibition; dialysis, however, failed to reverse established inhibition. These findings, suggest that the drugs operate by covalent attachment to crucial sulfhydryl functions on the enzyme. | Inhibition of L-asparagine synthetase by mucochloric and mucobromic acids. Mucochloric and mucobromic acids are powerful inhibitors of tumoral and pancreatic L-asparagine synthetases. Two nitrogen donors, L-glutamine and ammonia, can be used by these enzymes; at a concentration of 1 mmol/l, mucochloric and mucobromic acids preferentially inhibit the utilization of ammonia as opposed to L-glutamine in vitro. Using the tumoral enzyme, kinetic analysis revealed that mucochloric acid produced inhibition which was apparently noncompetitive with ammonia but competitive with L-glutamine. In molar excess, L-glutamine and dithiothreitol effectively antagonized such inhibition; dialysis, however, failed to reverse established inhibition. These findings, suggest that the drugs operate by covalent attachment to crucial sulfhydryl functions on the enzyme. | [
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PMID:12937 | Mitochondrial isocitrate dehydrogenase and isocitrate oxidation of rat ventral prostate. | Mitochondrial preparations isolated from rat ventral prostate were capable of oxidizing isocitrate by way of NADP isocitrate dehydrogenase (NADP-IDH) and NAD-IDH. NAD-IDH activity required ADP for activation. The pH responses for NAD-IDH and NADP-IDH were quite different. The results indicated that two different enzymes were involved in the NAD- and NADP-IDH activities. Indirect evidence indicated that NADPH-NAD transhydrogenase activity might also be involved in the mitochondrial pathway for isocitrate oxidation. NADP-IDH activity was significantly greater than NAD-IDH activity. The oxidation of isocitrate through IDH activity was coupled to the cytochrome system by NADPH- and NADH-cytochrome c reductase activities. Citrate, via isocitrate, oxidation proceeded at a much slower rate suggesting that aconitase activity could be limiting in the oxidation of citrate. In comparison to other tissues, the prostate oxidative enzyme activities are considerably lower. The results suggest that the accumulation of high prostate citrate levels is not due to a limitation imposed by a lack of IDH activity in prostate mitochondria. | Mitochondrial isocitrate dehydrogenase and isocitrate oxidation of rat ventral prostate. Mitochondrial preparations isolated from rat ventral prostate were capable of oxidizing isocitrate by way of NADP isocitrate dehydrogenase (NADP-IDH) and NAD-IDH. NAD-IDH activity required ADP for activation. The pH responses for NAD-IDH and NADP-IDH were quite different. The results indicated that two different enzymes were involved in the NAD- and NADP-IDH activities. Indirect evidence indicated that NADPH-NAD transhydrogenase activity might also be involved in the mitochondrial pathway for isocitrate oxidation. NADP-IDH activity was significantly greater than NAD-IDH activity. The oxidation of isocitrate through IDH activity was coupled to the cytochrome system by NADPH- and NADH-cytochrome c reductase activities. Citrate, via isocitrate, oxidation proceeded at a much slower rate suggesting that aconitase activity could be limiting in the oxidation of citrate. In comparison to other tissues, the prostate oxidative enzyme activities are considerably lower. The results suggest that the accumulation of high prostate citrate levels is not due to a limitation imposed by a lack of IDH activity in prostate mitochondria. | [
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|
PMID:12939 | Congenital methylmalonic acidemia: a variant of the B12 'non-responsive' form with evidence for reduced affinity of methylmalonyl-CoA mutase for its B12-coenzyme. | Methylmalonate metabolism was investigated in fibroblasts and leukocytes of two unrelated patient with a B12-nonresponsive type of congenital methylmalonic acidemia. Intact fibroblasts from both patients showed a defective metabolism of methyl-14 c-malonate to 14CO2, whereas no such defect was found in their intact peripheral leukocytes. In disrupted fibroblasts, the conversion of methylmalonyl coenzyme A to succinyl coenzyme A was markedly reduced but was completely normalized by the addition of 5'-deoxyadenosylcobalamin (AdoCb1; 10(-5) mol/l), the specific coenzyme of methylmalonyl coenzyme A mutase. Assays with decreasing concentrations of AdoCbl (10(-5)-10(-11) mol/l) suggested a reduced affinity of the mutase apoenzyme for its coenzyme, implicating yet another variant of this heterogeneous disease. | Congenital methylmalonic acidemia: a variant of the B12 'non-responsive' form with evidence for reduced affinity of methylmalonyl-CoA mutase for its B12-coenzyme. Methylmalonate metabolism was investigated in fibroblasts and leukocytes of two unrelated patient with a B12-nonresponsive type of congenital methylmalonic acidemia. Intact fibroblasts from both patients showed a defective metabolism of methyl-14 c-malonate to 14CO2, whereas no such defect was found in their intact peripheral leukocytes. In disrupted fibroblasts, the conversion of methylmalonyl coenzyme A to succinyl coenzyme A was markedly reduced but was completely normalized by the addition of 5'-deoxyadenosylcobalamin (AdoCb1; 10(-5) mol/l), the specific coenzyme of methylmalonyl coenzyme A mutase. Assays with decreasing concentrations of AdoCbl (10(-5)-10(-11) mol/l) suggested a reduced affinity of the mutase apoenzyme for its coenzyme, implicating yet another variant of this heterogeneous disease. | [
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PMID:12941 | Biosynthesis of peptidoglycan in Gaffkya homari. The mode of action of penicillin G and mecillinam. | The effect of the beta-lactam antibiotics penicillin G and mecillinam on the incorporation of peptidoglycan into pre-formed cell wall peptidoglycan was studied with wall membrane enzyme preparations from Gaffkya homari. Using UDP-N-acetylglucosamine (UDP-GlcNAc) and UDP-N-acetylmuramyl-pentapeptide (UDP-MurNAc-pentapeptide) as precursors the incorporation of peptidoglycan into the pre-existing cell wall of G. homari was inhibited to an extent of 50% (ID50 value) at a concentration of 0.25 mug of penicillin G/ml. With UDP-GlcNAc and UDP-MurNAc-tetrapeptide as precursors the ID50 value was about 2500-fold greater (630 mug/ml). The inhibition by penicillin G of the incorporation of peptidoglycan from UDP-MurNAc-[14C]Lys-pentapeptide could be overcome by addition of non-radioactive UDP-MurNAc-tetrapeptide to the incubation mixture. In the presence of 5 mug of penicillin G/ml the incorporation of peptidoglycan formed from the mixture of UDP-MurNAc-Ala-DGlu-Lys-D-[14C]Ala-D[14C]Ala and non-radioactive UDP-MurNAc-tetrapeptide proceeded virtually without release of D-[14C]alanine by transpeptidase activity. The enzyme preparation also exhibited DD-carboxypeptidase activity which was only slightly more sensitive to penicillin G and mecillinam than was the incorporation of peptidoglycan into the cell wall. Since the ID50 values for the beta-lactam antibiotics are similar to the concentrations required to inhibit the growth of G. homari to an extent of 50%, the DD-carboxypeptidase must be the killing site of both penicillin G and mecillinam. | Biosynthesis of peptidoglycan in Gaffkya homari. The mode of action of penicillin G and mecillinam. The effect of the beta-lactam antibiotics penicillin G and mecillinam on the incorporation of peptidoglycan into pre-formed cell wall peptidoglycan was studied with wall membrane enzyme preparations from Gaffkya homari. Using UDP-N-acetylglucosamine (UDP-GlcNAc) and UDP-N-acetylmuramyl-pentapeptide (UDP-MurNAc-pentapeptide) as precursors the incorporation of peptidoglycan into the pre-existing cell wall of G. homari was inhibited to an extent of 50% (ID50 value) at a concentration of 0.25 mug of penicillin G/ml. With UDP-GlcNAc and UDP-MurNAc-tetrapeptide as precursors the ID50 value was about 2500-fold greater (630 mug/ml). The inhibition by penicillin G of the incorporation of peptidoglycan from UDP-MurNAc-[14C]Lys-pentapeptide could be overcome by addition of non-radioactive UDP-MurNAc-tetrapeptide to the incubation mixture. In the presence of 5 mug of penicillin G/ml the incorporation of peptidoglycan formed from the mixture of UDP-MurNAc-Ala-DGlu-Lys-D-[14C]Ala-D[14C]Ala and non-radioactive UDP-MurNAc-tetrapeptide proceeded virtually without release of D-[14C]alanine by transpeptidase activity. The enzyme preparation also exhibited DD-carboxypeptidase activity which was only slightly more sensitive to penicillin G and mecillinam than was the incorporation of peptidoglycan into the cell wall. Since the ID50 values for the beta-lactam antibiotics are similar to the concentrations required to inhibit the growth of G. homari to an extent of 50%, the DD-carboxypeptidase must be the killing site of both penicillin G and mecillinam. | [
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|
PMID:12942 | pK changes of ionizable reporter groups as an index of conformational changes in proteins. A study of fluorescein-labelled ribonuclease A. | A chemical derivative of bovine pancreatic ribonuclease A (RNase A) has been prepared by reaction with fluorescein-isothiocyanate at pH 6. This derivative has a fluorescein group covalently attached to the alpha-amino group of the protein. The enzymic properties of the modified protein are similar to those of RNase A. It is shown that the pK of the fluorescein group can be used as an index of protein conformation to monitor structural changes in the protein. In this work, the binding of a specific inhibitor (cytidine 2'-monophosphate) to RNase A, the isomerization process occurring in RNase A around pH 6, and the thermal unfolding of RNase A, were studied by mean of the pK changes of the fluorescein group. The results obtained by this method are fully consistent with those obtained by other methods. It is proposed that using ionizable reporter groups and their changes in pK to monitor conformational changes in proteins may be a sensitive tool both in equilibrium and kinetic studies. | pK changes of ionizable reporter groups as an index of conformational changes in proteins. A study of fluorescein-labelled ribonuclease A. A chemical derivative of bovine pancreatic ribonuclease A (RNase A) has been prepared by reaction with fluorescein-isothiocyanate at pH 6. This derivative has a fluorescein group covalently attached to the alpha-amino group of the protein. The enzymic properties of the modified protein are similar to those of RNase A. It is shown that the pK of the fluorescein group can be used as an index of protein conformation to monitor structural changes in the protein. In this work, the binding of a specific inhibitor (cytidine 2'-monophosphate) to RNase A, the isomerization process occurring in RNase A around pH 6, and the thermal unfolding of RNase A, were studied by mean of the pK changes of the fluorescein group. The results obtained by this method are fully consistent with those obtained by other methods. It is proposed that using ionizable reporter groups and their changes in pK to monitor conformational changes in proteins may be a sensitive tool both in equilibrium and kinetic studies. | [
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|
PMID:12943 | The determination of the membrane ptoential of Chlorella vulgaris. Evidence for electrogenic sugar transport. | From data on the accumulation of tetraphenylphosphonium within Chlorella vulgaris cells, it can be estimated that these cells possess a membrane potential of --120 to --150 mV (inside negative). Under anaerobic conditions as well as in the presence of uncoupling agents the membrane potential drops to about -60 to -80 mV. Nystatin (50 mug/ml) abolishes it almost completely. Since it took more than 1 h before the tetraphenylphosphonium equilibrium was reached, this method could not be used to measure relatively fast transient changes in membrane potential. However, the rate of influx of tetraphenylphosphonium is also directly dependent on membrane potential and can be followed within minutes. Using this phenomenon as an indicator for membrane potential a brief transient depolarisation was detected after the addition of sugars taken up by Chlorella via the proton cotransport system. The depolarisation was absent from cells not induced for sugar uptake and induced cells did not show it with substances not transported, like mannitol. The maximal depolarisation observed amounted to about 70 mV; after 1 min, however, the membrane potential returned to a value about 25 mV less negative than the one before sugars was added. The results demonstrate that sugar uptake in Chlorella is electrogenic. The delta pH plus membrane potential measured for Chlorella completely cover the energy required to explain the 1600-fold accumulation of 6-deoxyglucose experimentally observed. | The determination of the membrane ptoential of Chlorella vulgaris. Evidence for electrogenic sugar transport. From data on the accumulation of tetraphenylphosphonium within Chlorella vulgaris cells, it can be estimated that these cells possess a membrane potential of --120 to --150 mV (inside negative). Under anaerobic conditions as well as in the presence of uncoupling agents the membrane potential drops to about -60 to -80 mV. Nystatin (50 mug/ml) abolishes it almost completely. Since it took more than 1 h before the tetraphenylphosphonium equilibrium was reached, this method could not be used to measure relatively fast transient changes in membrane potential. However, the rate of influx of tetraphenylphosphonium is also directly dependent on membrane potential and can be followed within minutes. Using this phenomenon as an indicator for membrane potential a brief transient depolarisation was detected after the addition of sugars taken up by Chlorella via the proton cotransport system. The depolarisation was absent from cells not induced for sugar uptake and induced cells did not show it with substances not transported, like mannitol. The maximal depolarisation observed amounted to about 70 mV; after 1 min, however, the membrane potential returned to a value about 25 mV less negative than the one before sugars was added. The results demonstrate that sugar uptake in Chlorella is electrogenic. The delta pH plus membrane potential measured for Chlorella completely cover the energy required to explain the 1600-fold accumulation of 6-deoxyglucose experimentally observed. | [
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|
PMID:12944 | Translation of mRNA from rat-liver polysomes into tyrosine aminotransferase and tryptophan oxygenase in a protein-synthesizing system from wheat germ. Effects of cortisol on the translatable levels of mRNA for these two enzymes. | Messenger RNA was isolated from rat liver polysomes by phenol/chloroform extraction and subsequent oligo(dT)-cellulose chromatography. The mRNA was translated in a protein-synthesizing system in vitro derived from wheat germ. The system was optimized in respect to Mg2+ and K+. The presence of spermidine or spermine is necessary for the synthesis of polypeptides having molecular weights of over 20 000. In the absence of the bases only small molecular weight products are formed. The amount of protein synthesized is linearly dependent on the amount of mRNA added up to concentrations of 80 mug mRNA/ml. The synthesis of tyrosine aminotransferase and tryptophan oxygenase in the system in vitro has been demonstrated by specific immunoprecipitation and sodium-dodecylsulfate polyacrylamide gel electrophoresis of the precipitate with enzyme proteins as marker. The amount of specific product formed is linearly dependent on the amount of mRNA present. The amount of translatable tyrosine aminotransferase mRNA and tryptophan oxygenase mRNA increases after administration of hydrocortisone to adrenalectomized rats. At low doses of hormone (2 mg/100 g body weight) maximal values are observed at 4 h, control levels being reached at 6-8 h after hormone application. With higher doses of hydrocortisone (20 mg/100 g body weight) maximal values are attained at 6 h, tending to control levels 14 h after treatment. The enzyme activity curves are parallel to the mRNA curves, the peak of enzyme activity occurring 2 h after the peak of mRNA activity. | Translation of mRNA from rat-liver polysomes into tyrosine aminotransferase and tryptophan oxygenase in a protein-synthesizing system from wheat germ. Effects of cortisol on the translatable levels of mRNA for these two enzymes. Messenger RNA was isolated from rat liver polysomes by phenol/chloroform extraction and subsequent oligo(dT)-cellulose chromatography. The mRNA was translated in a protein-synthesizing system in vitro derived from wheat germ. The system was optimized in respect to Mg2+ and K+. The presence of spermidine or spermine is necessary for the synthesis of polypeptides having molecular weights of over 20 000. In the absence of the bases only small molecular weight products are formed. The amount of protein synthesized is linearly dependent on the amount of mRNA added up to concentrations of 80 mug mRNA/ml. The synthesis of tyrosine aminotransferase and tryptophan oxygenase in the system in vitro has been demonstrated by specific immunoprecipitation and sodium-dodecylsulfate polyacrylamide gel electrophoresis of the precipitate with enzyme proteins as marker. The amount of specific product formed is linearly dependent on the amount of mRNA present. The amount of translatable tyrosine aminotransferase mRNA and tryptophan oxygenase mRNA increases after administration of hydrocortisone to adrenalectomized rats. At low doses of hormone (2 mg/100 g body weight) maximal values are observed at 4 h, control levels being reached at 6-8 h after hormone application. With higher doses of hydrocortisone (20 mg/100 g body weight) maximal values are attained at 6 h, tending to control levels 14 h after treatment. The enzyme activity curves are parallel to the mRNA curves, the peak of enzyme activity occurring 2 h after the peak of mRNA activity. | [
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|
PMID:12945 | 1, 4-alpha-Glucan phosphorylase from Klebsiella pneumoniae purification, subunit structure and amino acid composition. | 1. A 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae has been purified about 80-fold with an over-all yield greater than 35%. The purified enzyme has been shown to be homogeneous by gel electrophoresis at different pH-values, by isoelectric focusing, by dodecylsulfate electrophoresis and by ultracentrifugation. 2. The molecular weight of the native enzyme has been determined to be 180 000 by ultra-centrifugation studies, in good agreement with the value of 189 000 estimated by gel permeation chromatography. 3. The enzyme dissociates in the presence of 0.1% dodecylsulfate or 5 M guanidine hydrochloride into polypeptide chains. The molecular weight of these polypeptide chains has been found to be 88 000 by dodecylsulfate polyacrylamide gel electrophoresis and 99 000 by sedimentation equilibrium studies, indicating that the native enzyme is composed of two polypeptide chains. 4. The enzyme contains pyridoxalphosphate with a stoichiometry of two moles per 180 000 g protein, confirming that the 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae is a dimeric enzyme. 5. The amino acid composition of the enzyme has been determined, and its correspondence to that of 1,4-alpha-glucan phosphorylases from other sources is discussed. 6. The pI of the enzyme has been shown to be 5.3 and its pH-optimum to be about pH 5.9. The enzyme is stable in the range from pH 5.9 to 10.5. | 1, 4-alpha-Glucan phosphorylase from Klebsiella pneumoniae purification, subunit structure and amino acid composition. 1. A 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae has been purified about 80-fold with an over-all yield greater than 35%. The purified enzyme has been shown to be homogeneous by gel electrophoresis at different pH-values, by isoelectric focusing, by dodecylsulfate electrophoresis and by ultracentrifugation. 2. The molecular weight of the native enzyme has been determined to be 180 000 by ultra-centrifugation studies, in good agreement with the value of 189 000 estimated by gel permeation chromatography. 3. The enzyme dissociates in the presence of 0.1% dodecylsulfate or 5 M guanidine hydrochloride into polypeptide chains. The molecular weight of these polypeptide chains has been found to be 88 000 by dodecylsulfate polyacrylamide gel electrophoresis and 99 000 by sedimentation equilibrium studies, indicating that the native enzyme is composed of two polypeptide chains. 4. The enzyme contains pyridoxalphosphate with a stoichiometry of two moles per 180 000 g protein, confirming that the 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae is a dimeric enzyme. 5. The amino acid composition of the enzyme has been determined, and its correspondence to that of 1,4-alpha-glucan phosphorylases from other sources is discussed. 6. The pI of the enzyme has been shown to be 5.3 and its pH-optimum to be about pH 5.9. The enzyme is stable in the range from pH 5.9 to 10.5. | [
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|
PMID:12946 | Biosynthesis of peptidoglycan in Gaffkya homari. The incorporation of peptidoglycan into the cell wall and the direction of transpeptidation. | Wall membrane enzyme preparations from Gaffkya homari catalyze the formation of peptidoglycan from the precursor pairs: UDP-N-acetylglucosamine + UDP-N-acetylmuramyl-pentapeptide (UDP-MurNAc-Ala-DGlu-Lys-DAla-DAla) and also from UDP-N-acetylglucosamine + UDP-N-acetylmuramyl-tetrapeptide (UDP-MurNAc-Ala-DGlu-Lys-DAla). Part of the reaction products is soluble in 2% sodium dodecylsfulfate whereas the other part is bound to pre-existing cell wall peptidoglycan. The incorporation into cell wall takes place by a transpeptidation reaction in which the D-alanyl-D-alanine sequences in the pre-existing cell wall function as donors and the epsilon-amino groups of the lysine residues in the newly synthesized peptidoglycan strands function as acceptors. Nepsilon-D-Alanyl-lysine linkages are formed. At saturating concentration of UDP-N-acetylglucosamine, the enzyme system exhibits similar apparent Km values (30--80 muM) for UDP-MurNAc-pentapeptide and UDP-MurNAc-tetrapeptide both for the formation of cell-wall bound peptidoglycan and total (i.e. soluble + cell-wall-bound) peptidoglycan. The V values are also in the same order of magnitude (270-650 pmol x min-1 x mg of protein -1). However, UDP-MurNAc-tetrapeptide was a slightly better substrate than UDP-MurNAc-pentapeptide for the formation of cell-wall-bound peptidoglucan. The synthesis of total and cell-wall-bound peptidoglycan from UDP-MurNAc-pentapeptide was competitively inhibited by UDP-MurNAc-tetrapeptide and vice versa. UDP-MurNAc-tripeptide and both UDP-Mur-NAc-pentapeptide and UDP-Mur-NAc-tetrapeptide in which the epsilon-amino group of the lysine residue was substituted by an acetyl group were utilized less efficiently than UDP-MurNAc-pentapeptide and UDP-MurNAc-tetrapeptide for the formation of soluble peptidoglycan; they were exceedingly poor substrates for the formation of cell-wall-bound peptidoglycan. | Biosynthesis of peptidoglycan in Gaffkya homari. The incorporation of peptidoglycan into the cell wall and the direction of transpeptidation. Wall membrane enzyme preparations from Gaffkya homari catalyze the formation of peptidoglycan from the precursor pairs: UDP-N-acetylglucosamine + UDP-N-acetylmuramyl-pentapeptide (UDP-MurNAc-Ala-DGlu-Lys-DAla-DAla) and also from UDP-N-acetylglucosamine + UDP-N-acetylmuramyl-tetrapeptide (UDP-MurNAc-Ala-DGlu-Lys-DAla). Part of the reaction products is soluble in 2% sodium dodecylsfulfate whereas the other part is bound to pre-existing cell wall peptidoglycan. The incorporation into cell wall takes place by a transpeptidation reaction in which the D-alanyl-D-alanine sequences in the pre-existing cell wall function as donors and the epsilon-amino groups of the lysine residues in the newly synthesized peptidoglycan strands function as acceptors. Nepsilon-D-Alanyl-lysine linkages are formed. At saturating concentration of UDP-N-acetylglucosamine, the enzyme system exhibits similar apparent Km values (30--80 muM) for UDP-MurNAc-pentapeptide and UDP-MurNAc-tetrapeptide both for the formation of cell-wall bound peptidoglycan and total (i.e. soluble + cell-wall-bound) peptidoglycan. The V values are also in the same order of magnitude (270-650 pmol x min-1 x mg of protein -1). However, UDP-MurNAc-tetrapeptide was a slightly better substrate than UDP-MurNAc-pentapeptide for the formation of cell-wall-bound peptidoglucan. The synthesis of total and cell-wall-bound peptidoglycan from UDP-MurNAc-pentapeptide was competitively inhibited by UDP-MurNAc-tetrapeptide and vice versa. UDP-MurNAc-tripeptide and both UDP-Mur-NAc-pentapeptide and UDP-Mur-NAc-tetrapeptide in which the epsilon-amino group of the lysine residue was substituted by an acetyl group were utilized less efficiently than UDP-MurNAc-pentapeptide and UDP-MurNAc-tetrapeptide for the formation of soluble peptidoglycan; they were exceedingly poor substrates for the formation of cell-wall-bound peptidoglycan. | [
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|
PMID:12947 | CO2 reduction to formate by NADH catalysed by formate dehydrogenase from Pseudomonas oxalaticus. | The direct reduction of CO2 to formate is catalysed by formate: NAD oxidoreductase in the presence of substrate amounts of NADH. Proof for this reaction is supplied by the detection of a CO2-dependent NADH oxidation, and by the identification of [14c] formate as the product of a NADH-dependent reduction of [14c]carbonate. The enzyme-catalysed CO2 reduction by NADH attains the equilibrium predicted by thermodynamic considerations, a state which is also reached from the formate side. The Michaelis constant for CO2 is about 40 mM indicating the low affinity of the enzyme for this substrate. The corresponding value for formate is 0.1 mM. Under the special conditions employed the enzyme catalyses the formate oxidation about 30 times faster than the CO2 reduction. That CO2 and not HCO3- is the active species in the reduction was shown by comparing the ph dependency of the velocities of the forward and back reactions and by observing the kinetics of CO2 reduction during the simultaneous attainment of the CO2-HCO3- equilibrium. | CO2 reduction to formate by NADH catalysed by formate dehydrogenase from Pseudomonas oxalaticus. The direct reduction of CO2 to formate is catalysed by formate: NAD oxidoreductase in the presence of substrate amounts of NADH. Proof for this reaction is supplied by the detection of a CO2-dependent NADH oxidation, and by the identification of [14c] formate as the product of a NADH-dependent reduction of [14c]carbonate. The enzyme-catalysed CO2 reduction by NADH attains the equilibrium predicted by thermodynamic considerations, a state which is also reached from the formate side. The Michaelis constant for CO2 is about 40 mM indicating the low affinity of the enzyme for this substrate. The corresponding value for formate is 0.1 mM. Under the special conditions employed the enzyme catalyses the formate oxidation about 30 times faster than the CO2 reduction. That CO2 and not HCO3- is the active species in the reduction was shown by comparing the ph dependency of the velocities of the forward and back reactions and by observing the kinetics of CO2 reduction during the simultaneous attainment of the CO2-HCO3- equilibrium. | [
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|
PMID:12948 | Purification and properties of adductor muscle phosphofructokinase from the oyster, Crassostrea virginica. The aerobic/anaerobic transition: role of arginine phosphate in enzyme control. | Phosphofructokinase from oyster (Crassostrea virginica) adductor muscle occurs in a single electrophorectic form at an activity of 8.1 mumol of product formed per minute per gram wet weight. The enzyme was purified to homogeneity by a novel method involving extraction in dilute ethanol and subsequent precipitation with polyethylene glycol. Oyster adductor phosphofructokinase has a molecular weight of 3400000 +/- 20000 as measured by Sephadex gel chromatography. Mg2+ or Mn2+ can satisfy the divalent ion requirement while ATP, GTP, or ITP can serve as phosphate donors for the reaction. Oyster adductor phosphofructokinase displays hyperbolic saturation kinetics with respect to all substrates (fructose 6-phosphate, ATP, and Mg2+) at either pH 7.9 OR PH 6.8. The Michaelis constant for fructose 6 phosphate at pH 6.8, the cellular pH of anoxic oyster tissues, is 3.5 mM. In the presence of AMP, by far the most potent activator and deinhibitor of the enzyme, this drops to 0.70 mM. Many traditional effectors of phosphofructokinase including citrate, NAD(P)H,Ca2+, fructose 1,6-bisphosphate, 3-phosphoglycerate, ADP, and phosphoenolpyruvate do not alter enzyme activity when tested at their physiological concentrations. Monovalent ions (K +, NH4+) are activators of the enzyme. ATP and arginine phosphate are the only compounds found to inhibit the adductor enzyme. The inhibitory action of both can be reversed by physiological concentrations of AMP(0.2- 1.0mM) and to a lesser extent by high concentrations of Pi (20 mM) and adenosine 3' :5'-monophosphate (0.1 mM). The two inhibitors exhibit very different pH versus inhibition profiles. The Ki (ATP) decreases from 5.0 mM to 1.3 mM as the pH decreases from 7.9 to 6.8, whereas the Ki for arginine phosphate increases from 1.3 mM to 4.5 mM for the same pH drop. Of all compounds tested, only AMP, within its physiological range, activated adductor phosphofructokinase significantly at low pH values. The kinetic data support the proposal that arginine phosphate, not ATP or citrate, is the most likely regulator of adductor phosphofructokinase in vivo under aerobic, high tissue pH, conditions. In anoxia, the depletion of arginine phosphate reserves and the increase in AMP concentrations in the tissue, coupled with the increase in the Ki for arginine phosphate brought about by low pH conditions, serves to activate phosphofructokinase to aid maintenance of anaerobic energy production. | Purification and properties of adductor muscle phosphofructokinase from the oyster, Crassostrea virginica. The aerobic/anaerobic transition: role of arginine phosphate in enzyme control. Phosphofructokinase from oyster (Crassostrea virginica) adductor muscle occurs in a single electrophorectic form at an activity of 8.1 mumol of product formed per minute per gram wet weight. The enzyme was purified to homogeneity by a novel method involving extraction in dilute ethanol and subsequent precipitation with polyethylene glycol. Oyster adductor phosphofructokinase has a molecular weight of 3400000 +/- 20000 as measured by Sephadex gel chromatography. Mg2+ or Mn2+ can satisfy the divalent ion requirement while ATP, GTP, or ITP can serve as phosphate donors for the reaction. Oyster adductor phosphofructokinase displays hyperbolic saturation kinetics with respect to all substrates (fructose 6-phosphate, ATP, and Mg2+) at either pH 7.9 OR PH 6.8. The Michaelis constant for fructose 6 phosphate at pH 6.8, the cellular pH of anoxic oyster tissues, is 3.5 mM. In the presence of AMP, by far the most potent activator and deinhibitor of the enzyme, this drops to 0.70 mM. Many traditional effectors of phosphofructokinase including citrate, NAD(P)H,Ca2+, fructose 1,6-bisphosphate, 3-phosphoglycerate, ADP, and phosphoenolpyruvate do not alter enzyme activity when tested at their physiological concentrations. Monovalent ions (K +, NH4+) are activators of the enzyme. ATP and arginine phosphate are the only compounds found to inhibit the adductor enzyme. The inhibitory action of both can be reversed by physiological concentrations of AMP(0.2- 1.0mM) and to a lesser extent by high concentrations of Pi (20 mM) and adenosine 3' :5'-monophosphate (0.1 mM). The two inhibitors exhibit very different pH versus inhibition profiles. The Ki (ATP) decreases from 5.0 mM to 1.3 mM as the pH decreases from 7.9 to 6.8, whereas the Ki for arginine phosphate increases from 1.3 mM to 4.5 mM for the same pH drop. Of all compounds tested, only AMP, within its physiological range, activated adductor phosphofructokinase significantly at low pH values. The kinetic data support the proposal that arginine phosphate, not ATP or citrate, is the most likely regulator of adductor phosphofructokinase in vivo under aerobic, high tissue pH, conditions. In anoxia, the depletion of arginine phosphate reserves and the increase in AMP concentrations in the tissue, coupled with the increase in the Ki for arginine phosphate brought about by low pH conditions, serves to activate phosphofructokinase to aid maintenance of anaerobic energy production. | [
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|
PMID:12949 | Efficient purification and molecular properties of spinach chloroplast fructose 1,6-bisphosphatase. | A relatively straightforward procedure has been developed for the purification of chloroplast fructose bisphosphatase from spinach leaves to apparent homogeneity and with 80% yield. The molecular weight of the enzyme was about 160 000. Chloroplast fructosebisphosphatase consists of four possibly identical subunits and, at pH 8.8, EASILY DISSOCIATES INTO EQUAL HALVES WITH LOWered activity. Sigmoid saturation curves with Hill coefficients between 3.0 and 3.7 were obtained for fructose 1,6-bisphosphate and Mg2+. Incubation of the enzyme with 20 mM dithiothreitol slowly altered the response to pH from no activity measured at pH 7.5 and full activity at pH 8.8 to equal activity at each of these pH values; at the same time the number of freely available sulphydryl groups increased from four to twelve per molecule. These properties are considered in the context of the observed activation of this enzyme following illumination of chloroplasts. | Efficient purification and molecular properties of spinach chloroplast fructose 1,6-bisphosphatase. A relatively straightforward procedure has been developed for the purification of chloroplast fructose bisphosphatase from spinach leaves to apparent homogeneity and with 80% yield. The molecular weight of the enzyme was about 160 000. Chloroplast fructosebisphosphatase consists of four possibly identical subunits and, at pH 8.8, EASILY DISSOCIATES INTO EQUAL HALVES WITH LOWered activity. Sigmoid saturation curves with Hill coefficients between 3.0 and 3.7 were obtained for fructose 1,6-bisphosphate and Mg2+. Incubation of the enzyme with 20 mM dithiothreitol slowly altered the response to pH from no activity measured at pH 7.5 and full activity at pH 8.8 to equal activity at each of these pH values; at the same time the number of freely available sulphydryl groups increased from four to twelve per molecule. These properties are considered in the context of the observed activation of this enzyme following illumination of chloroplasts. | [
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|
PMID:12950 | Enzyme reduction of disulfide bonds by thioredoxin. The reactivity of disulfide bonds in human choriogonadotropin and its subunits. | The NADPH-dependent enzymic reduction of disulfide bonds in human choriogonadotropin and its two subunits, alpha and beta, was examined with thioredoxin and thioredoxin reductase from Escherichia coli. With 12 muM thioredoxin and 0.1 muM thioredoxin reductase at pH 7 all disulfide bonds in the alpha subunit could be reduced in 15 min. The reduction of disulfide bonds was recorded by a simple spectrophotometric assay at 340 nm, which allowed quantitation of the reduction rate and the number of disulfide bonds reduced. Partial reduction of the alpha subunit with thioredoxin followed by S-carboxymethylation with iodol[2-3H]acetic acid and analysis of tryptic peptides indicated that all S-S bonds in the alpha subunit were surface oriented and equally reactive. The usefulness of thioredoxin reduction of disulfide bonds as a chemical probe of protein structure was shown by the much slower reaction of disulfide bonds in the intact hormone as compared to its two biologically inactive subunits. | Enzyme reduction of disulfide bonds by thioredoxin. The reactivity of disulfide bonds in human choriogonadotropin and its subunits. The NADPH-dependent enzymic reduction of disulfide bonds in human choriogonadotropin and its two subunits, alpha and beta, was examined with thioredoxin and thioredoxin reductase from Escherichia coli. With 12 muM thioredoxin and 0.1 muM thioredoxin reductase at pH 7 all disulfide bonds in the alpha subunit could be reduced in 15 min. The reduction of disulfide bonds was recorded by a simple spectrophotometric assay at 340 nm, which allowed quantitation of the reduction rate and the number of disulfide bonds reduced. Partial reduction of the alpha subunit with thioredoxin followed by S-carboxymethylation with iodol[2-3H]acetic acid and analysis of tryptic peptides indicated that all S-S bonds in the alpha subunit were surface oriented and equally reactive. The usefulness of thioredoxin reduction of disulfide bonds as a chemical probe of protein structure was shown by the much slower reaction of disulfide bonds in the intact hormone as compared to its two biologically inactive subunits. | [
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|
PMID:12951 | Studies on 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe) from Escherichia coli K12. 1. Purification and subunit structure. | 1. 3-Deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe) from Escherichia coli K12 has been purified to near homogeneity. The purified enzyme has a specific activity of 67 units/mg which is about 1000 times that found in cell-free extracts of wild-tupe E. coli K12. 2. The minimum molecular weight of the enzyme was estimated by dodecylsuphate-gel electrophoresis to be 33000. Re-estimation of the native molecular weight by gel filtration confirmed the previously determined value of 110000. 3. Amino acid anaktsus abd tryptic fingerprints indicated that the subunits of the enzyme are very similar and possibly identical. 4. The purified enzyme does not contain Co2+. | Studies on 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe) from Escherichia coli K12. 1. Purification and subunit structure. 1. 3-Deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe) from Escherichia coli K12 has been purified to near homogeneity. The purified enzyme has a specific activity of 67 units/mg which is about 1000 times that found in cell-free extracts of wild-tupe E. coli K12. 2. The minimum molecular weight of the enzyme was estimated by dodecylsuphate-gel electrophoresis to be 33000. Re-estimation of the native molecular weight by gel filtration confirmed the previously determined value of 110000. 3. Amino acid anaktsus abd tryptic fingerprints indicated that the subunits of the enzyme are very similar and possibly identical. 4. The purified enzyme does not contain Co2+. | [
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PMID:12952 | Studies on 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe)from Escherichia coli K12. 2. Kinetic properties. | 1. Co2+ is not a cofactor for 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe). 2. The following analogues of phosphoenolpyruvate were tested as inhibitors of 3-deoxy-D-arabinoheptolosonate-7-phosphate synthetase(phe): pyruvate, lactate, glycerate, 2-phosphoglycerate, 2,3-bisphosphoglycerate, 3-methylphosphoenolpyruvate, 3-ethylphosphoenolpyruvate and 3,3-demethylphosphoenolpyruvate. The rusults obtained indicate that the binding of phosphoenolpyruvate to the enzyme requires a phosphoryl group on the C-2 position of the substrate and one free hydrogen atom at the C-3 position. 3. The dead-end inhibition pattern observed with the substrate analogue 2-phosphoglycerate when either phosphoenolpyruvate or erythrose 4-phosphate was the variable substrate is inconsistent with a ping-pong mechanism and indicates that the reaction mechanism for this enzyme must be sequential. The following kinetic constants were determined:Km for phosphoenolpyruvate, 0.08 +/- 0.04 mM; Km for erythrose 4-phosphate, 0.9 +/- 0.3 mM; K is for competitive inhibition by 2-phosphoglycerate with respect to phosphoenolpyruvate, 1.0 +/- 0.1 mM. 4. The enzyme was observed to have a bell-shaped pH PROFILE WITH A PH OPTIMUM OF 7.0. The effects of pH ON V and V/(Km for phosphoenolpyruvate) indicated that an ionizing group of pKa 8.0-8.1 is involved in the catalytic activity of the enzyme. The pKa of this group is unaffected by the binding of phosphoenolpyruvate. | Studies on 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe)from Escherichia coli K12. 2. Kinetic properties. 1. Co2+ is not a cofactor for 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe). 2. The following analogues of phosphoenolpyruvate were tested as inhibitors of 3-deoxy-D-arabinoheptolosonate-7-phosphate synthetase(phe): pyruvate, lactate, glycerate, 2-phosphoglycerate, 2,3-bisphosphoglycerate, 3-methylphosphoenolpyruvate, 3-ethylphosphoenolpyruvate and 3,3-demethylphosphoenolpyruvate. The rusults obtained indicate that the binding of phosphoenolpyruvate to the enzyme requires a phosphoryl group on the C-2 position of the substrate and one free hydrogen atom at the C-3 position. 3. The dead-end inhibition pattern observed with the substrate analogue 2-phosphoglycerate when either phosphoenolpyruvate or erythrose 4-phosphate was the variable substrate is inconsistent with a ping-pong mechanism and indicates that the reaction mechanism for this enzyme must be sequential. The following kinetic constants were determined:Km for phosphoenolpyruvate, 0.08 +/- 0.04 mM; Km for erythrose 4-phosphate, 0.9 +/- 0.3 mM; K is for competitive inhibition by 2-phosphoglycerate with respect to phosphoenolpyruvate, 1.0 +/- 0.1 mM. 4. The enzyme was observed to have a bell-shaped pH PROFILE WITH A PH OPTIMUM OF 7.0. The effects of pH ON V and V/(Km for phosphoenolpyruvate) indicated that an ionizing group of pKa 8.0-8.1 is involved in the catalytic activity of the enzyme. The pKa of this group is unaffected by the binding of phosphoenolpyruvate. | [
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PMID:12953 | Studies on 3-deoxy-d-arabinoheptulosonate-7-phosphate synthetase(phe) from escherichia coli k12. 3. Structural studies. | 1. Investigations with structural analogues of phenylalanine indicated an absolute requirement for the aromatic ring and both the alpha-carboxyl and alpha-amino groups of phenylalanine for inhibition of 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe) activity. Replacement of the alpha-H atom with a methyl group does not decrease the inhibition greatly. Varying degrees of inhibition were observed with o, m and p mono-substituted fluoro, chloro and hydroxy phenylalanines. D-Phenylalanine and several metabolites of the aromatic biosynthetic pathways do not inhibit enzymic activity. 2. Circular dichroism studies indicated that the native enzyme possesses approximately 26% alpha-helix. Both circular dichroic and ultraviolet difference spectra indicated that the addition of phenylalanine to the synthetase induces a conformational change involving a small alteration of the secondary structure and large alterations in th interactions of some of the aromatic residues of the enzyme. In particular, a tryptophan residue moves from an extremly hydrophobic environment to one less hydrophobic. 3. Kd for the binding of phenylalanine to the enzyme was determined spectrophotometrically to be 75 muM. 4. Chemical modification studies suggested that a sulphydryl group and possibly a lysine residue may be implicated in the catalytic activity of the enzyme. | Studies on 3-deoxy-d-arabinoheptulosonate-7-phosphate synthetase(phe) from escherichia coli k12. 3. Structural studies. 1. Investigations with structural analogues of phenylalanine indicated an absolute requirement for the aromatic ring and both the alpha-carboxyl and alpha-amino groups of phenylalanine for inhibition of 3-deoxy-D-arabinoheptulosonate-7-phosphate synthetase(phe) activity. Replacement of the alpha-H atom with a methyl group does not decrease the inhibition greatly. Varying degrees of inhibition were observed with o, m and p mono-substituted fluoro, chloro and hydroxy phenylalanines. D-Phenylalanine and several metabolites of the aromatic biosynthetic pathways do not inhibit enzymic activity. 2. Circular dichroism studies indicated that the native enzyme possesses approximately 26% alpha-helix. Both circular dichroic and ultraviolet difference spectra indicated that the addition of phenylalanine to the synthetase induces a conformational change involving a small alteration of the secondary structure and large alterations in th interactions of some of the aromatic residues of the enzyme. In particular, a tryptophan residue moves from an extremly hydrophobic environment to one less hydrophobic. 3. Kd for the binding of phenylalanine to the enzyme was determined spectrophotometrically to be 75 muM. 4. Chemical modification studies suggested that a sulphydryl group and possibly a lysine residue may be implicated in the catalytic activity of the enzyme. | [
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PMID:12954 | A method for measuring the internal pH in illuminated chloroplasts based on the stimulation of proton uptake by amines. | A simple method for measuring the internal pH of chloroplasts during steady-state illuminations based on the stimulation of proton uptake by monofunctional amines was developed. Predictions of a mathematical derivation concerning the dependence of the stimulation on the amine concentration, the internal volume, the pK of the amine and the external pH have been verified experimentally. To circumvent uncoupling and swelling due to large internal accumulation of amines extrapolation of the stimulation to low amine concentrations was suggested and shown to lead to valid values. Alternatively, swelling could be largely reduced in a medium containing potassium aspartate and valinomycin. | A method for measuring the internal pH in illuminated chloroplasts based on the stimulation of proton uptake by amines. A simple method for measuring the internal pH of chloroplasts during steady-state illuminations based on the stimulation of proton uptake by monofunctional amines was developed. Predictions of a mathematical derivation concerning the dependence of the stimulation on the amine concentration, the internal volume, the pK of the amine and the external pH have been verified experimentally. To circumvent uncoupling and swelling due to large internal accumulation of amines extrapolation of the stimulation to low amine concentrations was suggested and shown to lead to valid values. Alternatively, swelling could be largely reduced in a medium containing potassium aspartate and valinomycin. | [
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|
PMID:12955 | Effect of thyroid hormones on microsomal fatty acid chain elongation synthesis in rat liver. | Evidence is presented that rat liver microsomal fatty acid chain elongation synthesis and desaturation, as well as acetyl-CoA carboxylase and fatty acid synthetase, are strongly influenced by thyroid hormone level. Conversely, the fatty acid chain elongation system in mitochondria, unlike the oxidative capacity of palmitate, NADH, succinate and malate, does not seem significantly affected by the thyrotoxic state. In triiodothyronine-induced or thyroxine-induced hyperthyroidism, rat liver acetyl-CoA carboxylase, fatty acid synthetase and microsomal chain elongation and desaturation reactions are not greatly affected after the first 10 days of treatment, while after longer intervals a respective increase in these activities is shown of up to 87, 116 and 65% after 22 days. In propylthiouracil-induced hypothyroidism, all the above synthetic activities are strongly reduced immediately after three days of drug administration and diminished no further following longer periods. Although the pattern of synthesized fatty acids in the thyrotoxic state is similar to that obtained from normal subcellular rat fractions, the esterification process of fatty acids in microsomal lipids appears to be slightly inhibited in hypothyroid rats and increased following triiodothyronine or thyroxine administration. Finally, a reduction in the hepatic cyclic AMP level of about 41% is reported after 19 days of triiodothyronine-administration to rats. On the basis of the observed insensitivity of the mitochondrial fatty acid chain elongation system to the thyrotoxic state, a tentative interpretation of its role in the hepatic cell is postulated. | Effect of thyroid hormones on microsomal fatty acid chain elongation synthesis in rat liver. Evidence is presented that rat liver microsomal fatty acid chain elongation synthesis and desaturation, as well as acetyl-CoA carboxylase and fatty acid synthetase, are strongly influenced by thyroid hormone level. Conversely, the fatty acid chain elongation system in mitochondria, unlike the oxidative capacity of palmitate, NADH, succinate and malate, does not seem significantly affected by the thyrotoxic state. In triiodothyronine-induced or thyroxine-induced hyperthyroidism, rat liver acetyl-CoA carboxylase, fatty acid synthetase and microsomal chain elongation and desaturation reactions are not greatly affected after the first 10 days of treatment, while after longer intervals a respective increase in these activities is shown of up to 87, 116 and 65% after 22 days. In propylthiouracil-induced hypothyroidism, all the above synthetic activities are strongly reduced immediately after three days of drug administration and diminished no further following longer periods. Although the pattern of synthesized fatty acids in the thyrotoxic state is similar to that obtained from normal subcellular rat fractions, the esterification process of fatty acids in microsomal lipids appears to be slightly inhibited in hypothyroid rats and increased following triiodothyronine or thyroxine administration. Finally, a reduction in the hepatic cyclic AMP level of about 41% is reported after 19 days of triiodothyronine-administration to rats. On the basis of the observed insensitivity of the mitochondrial fatty acid chain elongation system to the thyrotoxic state, a tentative interpretation of its role in the hepatic cell is postulated. | [
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|
PMID:12956 | Esterolytic activities of rat intestinal mucosa. 1. Characterization, cellular distribution and subcellular localization of a glycerol-ester hydrolase. | The preferential cellular distribution in the villus tip and the subcellular localization in the endoplasmic reticulum of an intestinal glycerol-ester hydrolase from rat mucosa are described. The enzyme is shown not to be from either pancreatic or bacterial origin; it catalyzes the hydrolysis of short- and medium chain triglycerides and of p-nitrophenylacetate. Contrarily to the specificity found for the pig intestinal lipase (Serrero, Négrel and Ailhaud, 1975), no activity is detectable against acylCoA; a thiolester hydrolase different from the glycerol-ester hydrolase was demonstrated after differential solubilization and chromatographic separation. A high proportion of glycerol-ester hydrolase is present in the intestinal lumen; its possible complementary role in lipid degradation is discussed. | Esterolytic activities of rat intestinal mucosa. 1. Characterization, cellular distribution and subcellular localization of a glycerol-ester hydrolase. The preferential cellular distribution in the villus tip and the subcellular localization in the endoplasmic reticulum of an intestinal glycerol-ester hydrolase from rat mucosa are described. The enzyme is shown not to be from either pancreatic or bacterial origin; it catalyzes the hydrolysis of short- and medium chain triglycerides and of p-nitrophenylacetate. Contrarily to the specificity found for the pig intestinal lipase (Serrero, Négrel and Ailhaud, 1975), no activity is detectable against acylCoA; a thiolester hydrolase different from the glycerol-ester hydrolase was demonstrated after differential solubilization and chromatographic separation. A high proportion of glycerol-ester hydrolase is present in the intestinal lumen; its possible complementary role in lipid degradation is discussed. | [
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|
PMID:12957 | Esterolytic activities of rat intestinal mucosa. 2. Purification and properties of a glycerol-ester hydrolase. | A glycerol-ester hydrolase from rat intestinal cells has been purified using chromatography on carboxyhexanoyl-Sepharose-glyceryldioctanoate and preparative gel electrophoresis. The enzyme gives a single band by analytical gel electrophoresis; it is a monomer of molecular weight 68000. The optimum pH for its action on glyceryl tributyrate is between 8.0 and 8.5; the activation energy was calculated to be 8.7 kcal x mol-1 (36.4 kJ/mol). Its substrate specificity is mainly directed against esters of glycerol and of primary monoalcohols. Similarly to pancreatic lipase but contrary to liver esterase, it is inhibited by bile salts; relief of this inhibition by colipase is only observed for pancreatic lipase. The possible role of the glycerol-ester hydrolase in the absorption of short and of medium chain triglycerides is discussed. | Esterolytic activities of rat intestinal mucosa. 2. Purification and properties of a glycerol-ester hydrolase. A glycerol-ester hydrolase from rat intestinal cells has been purified using chromatography on carboxyhexanoyl-Sepharose-glyceryldioctanoate and preparative gel electrophoresis. The enzyme gives a single band by analytical gel electrophoresis; it is a monomer of molecular weight 68000. The optimum pH for its action on glyceryl tributyrate is between 8.0 and 8.5; the activation energy was calculated to be 8.7 kcal x mol-1 (36.4 kJ/mol). Its substrate specificity is mainly directed against esters of glycerol and of primary monoalcohols. Similarly to pancreatic lipase but contrary to liver esterase, it is inhibited by bile salts; relief of this inhibition by colipase is only observed for pancreatic lipase. The possible role of the glycerol-ester hydrolase in the absorption of short and of medium chain triglycerides is discussed. | [
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|
PMID:12958 | Acetyl-coenzyme-A carboxylase of Candida Lipolytica. 1. Purification and properties of the enzyme. | Acetyl-coenzyme-A carboxylase has been isolated in homogeneous form from Candida lipolytica. The homogeneity of the enzyme preparation is evidenced by analytical ultracentrifugation, dodecyl-sulfate-polyacrylamide gel electrophoresis and Ouchterlony double-diffusion analysis. The purified enzyme exhibits a specific activity of 8.0 U/mg protein at 25 degrees C and contains 1 mol biotin/263000 g protein. The sedimentation coefficient (S20,W) of the enzyme is 18 S. It has been shown by dodecyl-sulfate-polyacrylamide gel electrophoresis that the enzyme possesses only one kind of subunit with a molecular weight of 230000. This finding, together with the biotin content, indicates that the C. lipolytica enzyme has a highly integrated subunit structure. The C. lipolytica enzyme is very labile, but is stabilized by glycerol. The enzyme is markedly activated by poly(ethyleneglycol), the activation being due principally to a decrease in the Km values for substrates. Even in the presence of this activator, the Km value for acetyl-CoA of the C. lipolytica enzyme is much higher than that of the enzyme from Saccharomyces cerevisiae and animal tissues. The C. lipolytica enzyme, unlike the enzyme from animal tissues, is not activated by citrate. | Acetyl-coenzyme-A carboxylase of Candida Lipolytica. 1. Purification and properties of the enzyme. Acetyl-coenzyme-A carboxylase has been isolated in homogeneous form from Candida lipolytica. The homogeneity of the enzyme preparation is evidenced by analytical ultracentrifugation, dodecyl-sulfate-polyacrylamide gel electrophoresis and Ouchterlony double-diffusion analysis. The purified enzyme exhibits a specific activity of 8.0 U/mg protein at 25 degrees C and contains 1 mol biotin/263000 g protein. The sedimentation coefficient (S20,W) of the enzyme is 18 S. It has been shown by dodecyl-sulfate-polyacrylamide gel electrophoresis that the enzyme possesses only one kind of subunit with a molecular weight of 230000. This finding, together with the biotin content, indicates that the C. lipolytica enzyme has a highly integrated subunit structure. The C. lipolytica enzyme is very labile, but is stabilized by glycerol. The enzyme is markedly activated by poly(ethyleneglycol), the activation being due principally to a decrease in the Km values for substrates. Even in the presence of this activator, the Km value for acetyl-CoA of the C. lipolytica enzyme is much higher than that of the enzyme from Saccharomyces cerevisiae and animal tissues. The C. lipolytica enzyme, unlike the enzyme from animal tissues, is not activated by citrate. | [
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|
PMID:12959 | Acetyl-coenzyme-A carboxylase of Candida lipolytica. 2. Regulation of cellular content and synthesis of the enzyme. | The level of acetyl-coenzyme-A carboxylase activity in Candida lipolytica undergoes large variations depending upon the carbon source on which the yeast is grown. Cells grown on n-alkanes or fatty acids exhibit a lower activity level than do cells grown on glucose. Among the n-alkanes and fatty acids tested, n-heptadecane, n-octadecane, oleic acid and linoleic acid reduce the enzyme activity to the lowest levels, which are 16-18% of the activity level in glucose-grown cells. Immunochemical titrations and Ouchterlony double-diffusion analysis with specific antibody as well as kinetic studies have indicated that the observed decrease in the level of acetyl-CoA carboxylase activity is due to a reduction in the cellular content of the enzyme. Furthermore, isotopic leucine incorporation studies with the use of the immunoprecipitation technique have demonstrated that the relative rate of synthesis of the enzyme in oleic-acid-grown cells is diminished to 12% of that in glucose-grown cells. Evidence has also been obtained to support the view that the enzyme in this yeast is not degraded at a rate high enough to contribute to the marked decrease in the cellular content of the enzyme. Thus, it is concluded that the reduction in acetyl-CoA carboxylase content in fatty-acid-grown cells is due to diminished synthesis of the enzyme. | Acetyl-coenzyme-A carboxylase of Candida lipolytica. 2. Regulation of cellular content and synthesis of the enzyme. The level of acetyl-coenzyme-A carboxylase activity in Candida lipolytica undergoes large variations depending upon the carbon source on which the yeast is grown. Cells grown on n-alkanes or fatty acids exhibit a lower activity level than do cells grown on glucose. Among the n-alkanes and fatty acids tested, n-heptadecane, n-octadecane, oleic acid and linoleic acid reduce the enzyme activity to the lowest levels, which are 16-18% of the activity level in glucose-grown cells. Immunochemical titrations and Ouchterlony double-diffusion analysis with specific antibody as well as kinetic studies have indicated that the observed decrease in the level of acetyl-CoA carboxylase activity is due to a reduction in the cellular content of the enzyme. Furthermore, isotopic leucine incorporation studies with the use of the immunoprecipitation technique have demonstrated that the relative rate of synthesis of the enzyme in oleic-acid-grown cells is diminished to 12% of that in glucose-grown cells. Evidence has also been obtained to support the view that the enzyme in this yeast is not degraded at a rate high enough to contribute to the marked decrease in the cellular content of the enzyme. Thus, it is concluded that the reduction in acetyl-CoA carboxylase content in fatty-acid-grown cells is due to diminished synthesis of the enzyme. | [
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|
PMID:12960 | Isolation, subunit structure and properties of the ATP-dependent deoxyribonuclease of Bacillus subtilis. State of the protein in a mutant devoid of activity. | A prodcedure was developed for the purification of the ATP-dependent deoxyribonuclease of Bacillus subtilis 168. It comprises ammonium sulphate fractionation, Sephadex gel filtration, DEAE-cellulose chromatography and gel electrophoresis on a discontinuous polyacrylamide gradient. The enzyme has been obtained in a homogeneous state. Its molecular weight was estimated to be 270000 by disc electrophoresis. Dodecylsulfate-polyacrylamide gel electrophoresis showed the presence of five nonidentical subunits of the following molecular weights: 81000, 70000, 62000, 52500 and 42500. These values give 308000 as the molecular weight of the native enzyme. The pH optimum of the purified enzyme is 9.6. The optimal concentrations of Mg2+ and ATP for exonuclease activity on native B. subtilis DNA were determined. ATP-requirement for hydrolysis of single-stranded DNA is less strigent. The enzyme also possesses high DNA-dependent ATPase activity. The purification procedure was applied to extracts of a mutant devoid of activity for this enzyme (strain GSY 1290). A protein was isolated which is very similar to the active DNAase as regards electrophoretic mobility, reaction with specific antisera and size of four of the subunits. One subunit is missing (Mr 70000) and is replaced by a smaller polypeptide (Mr 565000). The latter results suggest that the mutant is affected in the genetic locus coding for the 70000-Mr subunit. | Isolation, subunit structure and properties of the ATP-dependent deoxyribonuclease of Bacillus subtilis. State of the protein in a mutant devoid of activity. A prodcedure was developed for the purification of the ATP-dependent deoxyribonuclease of Bacillus subtilis 168. It comprises ammonium sulphate fractionation, Sephadex gel filtration, DEAE-cellulose chromatography and gel electrophoresis on a discontinuous polyacrylamide gradient. The enzyme has been obtained in a homogeneous state. Its molecular weight was estimated to be 270000 by disc electrophoresis. Dodecylsulfate-polyacrylamide gel electrophoresis showed the presence of five nonidentical subunits of the following molecular weights: 81000, 70000, 62000, 52500 and 42500. These values give 308000 as the molecular weight of the native enzyme. The pH optimum of the purified enzyme is 9.6. The optimal concentrations of Mg2+ and ATP for exonuclease activity on native B. subtilis DNA were determined. ATP-requirement for hydrolysis of single-stranded DNA is less strigent. The enzyme also possesses high DNA-dependent ATPase activity. The purification procedure was applied to extracts of a mutant devoid of activity for this enzyme (strain GSY 1290). A protein was isolated which is very similar to the active DNAase as regards electrophoretic mobility, reaction with specific antisera and size of four of the subunits. One subunit is missing (Mr 70000) and is replaced by a smaller polypeptide (Mr 565000). The latter results suggest that the mutant is affected in the genetic locus coding for the 70000-Mr subunit. | [
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|
PMID:12961 | The effect of endogenous phosphate on the H+/Mn2+ ratio and the state of Mn2+ in the mitochondrial matrix. | 1. Kinetics and stoichiometry of H+ extrusion and reuptake and of Mn2+ uptake and release have been measured in respiring liver mitochondria in the absence of external added Pi. H+ and Mn2+ fluxes are parallel during aerobic cation uptake but not during uncoupler induced cation release. The H+/Mn2+ is 1.24. Addition of SH reagents, in concentrations inhibiting the Pi carrier, modifies the kinetics of H+ extrusion and of Mn2+ uptake and release. The slow phase of uncoupler induced Mn2+ release is diminished. The H+/Mn2+ is increased to 1.72. Addition of SH reagents, after the phase of aerobic uptake is completed, results in a significant reduction of the extent of uncoupler-induced Mn2+ release. The extent of reuptake of endogenous Pi during aerobic uptake of Mn2+ is about 8 nmol x mg protein-1. 2. Aerobic uptake of Mn2+ in the absence of external Pi results in an electron spin resonance spectrum which is the sum of two components. One, denoted as S, corresponds to Mn(H2O)2+(6). Another denoted as E, reflects spin exchange narrowing. In contrast to previous claims the following evidence suggests that the spin exchange component is due to Mn3(PO4)2 precipitate: (a) the dimension of the spin exchange spectrum is markedly reduced by abolition of Pi transport; (b) the spin exchange spectrum is released very slowly by addition of uncouplers under conditions where uncouplers cause a rapid deenergization of mitochondria, reuptake of H+ and release of cations; (c) the free matrix Mn2+ is released slowly after addition of uncoupler if there is a large spin exchange signal; howeover the free matrix Mn2+ is abolished rapidly by uncoupler when formation of the spin exchange signal is prevented by pretreatment with Ca2+; (d) the band width of the spin exchange fraction is independent of the Mn2+/protein ratio either under kinetic or steady state conditions; (e) the experimental spectrum recalls closely that obtained by computer simulation by assuming it as a combination of Mn(H2O)2+(6) and Mn3(PO4)2. 3. It is concluded that endogenous Pi affects the process of aerobic divalent cation uptake. A part of Mn2+ uptake in the absence of externally added anions, consists of a Mn3(PO4)2 precipitate. This accounts for a H+/Mn2+ ratio lower than 2. | The effect of endogenous phosphate on the H+/Mn2+ ratio and the state of Mn2+ in the mitochondrial matrix. 1. Kinetics and stoichiometry of H+ extrusion and reuptake and of Mn2+ uptake and release have been measured in respiring liver mitochondria in the absence of external added Pi. H+ and Mn2+ fluxes are parallel during aerobic cation uptake but not during uncoupler induced cation release. The H+/Mn2+ is 1.24. Addition of SH reagents, in concentrations inhibiting the Pi carrier, modifies the kinetics of H+ extrusion and of Mn2+ uptake and release. The slow phase of uncoupler induced Mn2+ release is diminished. The H+/Mn2+ is increased to 1.72. Addition of SH reagents, after the phase of aerobic uptake is completed, results in a significant reduction of the extent of uncoupler-induced Mn2+ release. The extent of reuptake of endogenous Pi during aerobic uptake of Mn2+ is about 8 nmol x mg protein-1. 2. Aerobic uptake of Mn2+ in the absence of external Pi results in an electron spin resonance spectrum which is the sum of two components. One, denoted as S, corresponds to Mn(H2O)2+(6). Another denoted as E, reflects spin exchange narrowing. In contrast to previous claims the following evidence suggests that the spin exchange component is due to Mn3(PO4)2 precipitate: (a) the dimension of the spin exchange spectrum is markedly reduced by abolition of Pi transport; (b) the spin exchange spectrum is released very slowly by addition of uncouplers under conditions where uncouplers cause a rapid deenergization of mitochondria, reuptake of H+ and release of cations; (c) the free matrix Mn2+ is released slowly after addition of uncoupler if there is a large spin exchange signal; howeover the free matrix Mn2+ is abolished rapidly by uncoupler when formation of the spin exchange signal is prevented by pretreatment with Ca2+; (d) the band width of the spin exchange fraction is independent of the Mn2+/protein ratio either under kinetic or steady state conditions; (e) the experimental spectrum recalls closely that obtained by computer simulation by assuming it as a combination of Mn(H2O)2+(6) and Mn3(PO4)2. 3. It is concluded that endogenous Pi affects the process of aerobic divalent cation uptake. A part of Mn2+ uptake in the absence of externally added anions, consists of a Mn3(PO4)2 precipitate. This accounts for a H+/Mn2+ ratio lower than 2. | [
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|
PMID:12962 | A pH-dependent interaction between histones H2A and H2B involving secondary and tertiary folding. | It has been shown by high-resolution proton magnetic resonance (PMR) spectroscopy and circular dichroism (CD) that an H2A/H2B histone complex exists after salt extraction of these histones from chromatin and that this complex can be fully renatured from both urea-denatured acid-extracted and from urea-denatured salt-extracted histones. The histone complex is shown to involve specific secondary and tertiary structure. Formation of this complex is observed to be critically dependent on pH, occurring at and above pH 5. It cannot be induced below pH 5 by increase in ionic strength. From CD spectra the H2A/H2B complex is shown to contain about 37% alpha helix but no beta structure, the latter being confirmed by infrared spectroscopy in the 6-mum region. The PMR spectra show that the structured region includes most of the aromatic residues of both histones, at least two histidine residues of H2B and probably histidines 31 and 82 of histone H2A. The secondary structure of histones H2A and H2B is predicted using the Chou and Fasman procedure and comparisons are made between the predictions for histones of different species. These results in conjunction with the experimental evidence lead to the conclusion that at least residues 31-95 of H2A and residues 37-114 of H2B, i.e. the more apolar regions of the molecules, are involved in the tertiary structure of the H2A/H2B complex. | A pH-dependent interaction between histones H2A and H2B involving secondary and tertiary folding. It has been shown by high-resolution proton magnetic resonance (PMR) spectroscopy and circular dichroism (CD) that an H2A/H2B histone complex exists after salt extraction of these histones from chromatin and that this complex can be fully renatured from both urea-denatured acid-extracted and from urea-denatured salt-extracted histones. The histone complex is shown to involve specific secondary and tertiary structure. Formation of this complex is observed to be critically dependent on pH, occurring at and above pH 5. It cannot be induced below pH 5 by increase in ionic strength. From CD spectra the H2A/H2B complex is shown to contain about 37% alpha helix but no beta structure, the latter being confirmed by infrared spectroscopy in the 6-mum region. The PMR spectra show that the structured region includes most of the aromatic residues of both histones, at least two histidine residues of H2B and probably histidines 31 and 82 of histone H2A. The secondary structure of histones H2A and H2B is predicted using the Chou and Fasman procedure and comparisons are made between the predictions for histones of different species. These results in conjunction with the experimental evidence lead to the conclusion that at least residues 31-95 of H2A and residues 37-114 of H2B, i.e. the more apolar regions of the molecules, are involved in the tertiary structure of the H2A/H2B complex. | [
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|
PMID:12963 | Stopped-flow spectrophotometric characterization of enzymic reaction intermediates in the anaerobic reduction of pig-plasma benzylamine oxidase by amine substrates. | Reduction of benzylamine oxidase by p-methoxybenzylamine under anaerobic conditions leads to biphasic absorbance changes at 470 nm. These reflect the intermediate formation of an enzyme substrate complex with spectral properties different from those of native enzyme and fully reduced enzyme. The spectrally modified enzyme-substrate complex exhibits a broad difference absorption band centered around 360 nm. The transient accumulation of this intermediate during reaction can be conveniently followed by stopped-flow techniques at wavelengths between 320 and 360 nm, where contributions from the subsequent reduction of the enzymic 470-nm chromophore are of minor significance. 2. Analogous intermediates exhibiting similar absorption spectra seem to be formed on reduction of the enzyme by benzylamine and other amine substrates which were tested. Substitution of benzylamine as the reducing substrate by [alpha, alpha-2H]benzylamine results in a decreased accumulation of the spectrally modified intermediate. This indicates that its formation is preceded by deprotonation of the alpha-carbon of the amine substrate. 3. Circular dichroism spectra of benzylamine oxidase exhibit a positive band at 360 nm, lending support to the previous conclusion that benzylamine oxidase is a pyridoxal enzyme. Formation of the spectrally modified enzyme-substrate complex then most likely reflects the prototropic shift converting an amine-pyridoxal Schiff-base obtained by rapid pre-equilibration between enzyme and substrate into an aldehyde-pyridoxamine Schiff-base. | Stopped-flow spectrophotometric characterization of enzymic reaction intermediates in the anaerobic reduction of pig-plasma benzylamine oxidase by amine substrates. Reduction of benzylamine oxidase by p-methoxybenzylamine under anaerobic conditions leads to biphasic absorbance changes at 470 nm. These reflect the intermediate formation of an enzyme substrate complex with spectral properties different from those of native enzyme and fully reduced enzyme. The spectrally modified enzyme-substrate complex exhibits a broad difference absorption band centered around 360 nm. The transient accumulation of this intermediate during reaction can be conveniently followed by stopped-flow techniques at wavelengths between 320 and 360 nm, where contributions from the subsequent reduction of the enzymic 470-nm chromophore are of minor significance. 2. Analogous intermediates exhibiting similar absorption spectra seem to be formed on reduction of the enzyme by benzylamine and other amine substrates which were tested. Substitution of benzylamine as the reducing substrate by [alpha, alpha-2H]benzylamine results in a decreased accumulation of the spectrally modified intermediate. This indicates that its formation is preceded by deprotonation of the alpha-carbon of the amine substrate. 3. Circular dichroism spectra of benzylamine oxidase exhibit a positive band at 360 nm, lending support to the previous conclusion that benzylamine oxidase is a pyridoxal enzyme. Formation of the spectrally modified enzyme-substrate complex then most likely reflects the prototropic shift converting an amine-pyridoxal Schiff-base obtained by rapid pre-equilibration between enzyme and substrate into an aldehyde-pyridoxamine Schiff-base. | [
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|
PMID:12964 | Proton equilibria in the binding of Zn2+ and of methylmercuric iodide to papain. | The proton liberation on the binding of zinc chloride and methylmercuric iodide to the (essential) thiol group of papain has been examined as a function of pH. This was carried out by (a) direct titration of the protons on the addition of the metal compound to active papain and (b) measurement of the extent of inhibition of enzyme activity by the metal compound as a function of pH. It was found that in the neutral pH range the thiol group or the neighbouring imidazole group in the free enzyme carries one proton, at low pH both groups do so, whereas at high pH neither group carries a proton. The pK values of the free enzyme that govern the proton release, 4.2 and 8.5, correspond to those that govern overall activity. Both from the experiments with methylmercuric iodide and from fluorescence measurements of methylmercuric papain, it was established that the imidazole group in the latter compound exhibits a pK of 5.4. Taking recent data into account, it was considered that the ion pair of thiolate anion and imidazolium cation, proposed by Polgar, is the best approximation to describe the charge distribution in the active centre and to explain the reaction mechanism. | Proton equilibria in the binding of Zn2+ and of methylmercuric iodide to papain. The proton liberation on the binding of zinc chloride and methylmercuric iodide to the (essential) thiol group of papain has been examined as a function of pH. This was carried out by (a) direct titration of the protons on the addition of the metal compound to active papain and (b) measurement of the extent of inhibition of enzyme activity by the metal compound as a function of pH. It was found that in the neutral pH range the thiol group or the neighbouring imidazole group in the free enzyme carries one proton, at low pH both groups do so, whereas at high pH neither group carries a proton. The pK values of the free enzyme that govern the proton release, 4.2 and 8.5, correspond to those that govern overall activity. Both from the experiments with methylmercuric iodide and from fluorescence measurements of methylmercuric papain, it was established that the imidazole group in the latter compound exhibits a pK of 5.4. Taking recent data into account, it was considered that the ion pair of thiolate anion and imidazolium cation, proposed by Polgar, is the best approximation to describe the charge distribution in the active centre and to explain the reaction mechanism. | [
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|
PMID:12965 | Electron spin resonance investigations of mitochondrial electron transport in Neurospora crassa. Characterization of paramagnetic intermediates in a standard strain. | 1. Submitochondrial particles from Neurospora strain inl-89601 have been analyzed by electron spin resonance spectroscopy (ESR). Numerous signals due to iron-sulfur proteins are observed at low temperatures. Analysis of these ESR signals at various temperatures allows the assignment of resonances to iron-sulfur centers 1-5 that have been described in other organisms. There are no discrepancies between the signals seen in Neurospora and those described in other organisms and it is likely that Neurospora mitochondria contain the same iron-sulfur centers that are observed elsewhere. 2. NADPH and NADH act to reduce the iron-sulfur centers of respiratory complex I. 3. The drug pyrrolnitrin [3-chloro-4-(2'-nitro-3'-chlorphenyl)pyrrole] is an effective inhibitor of both NADH-supported and succinate-supported electron transport in Neurospora. 4. Analysis of pyrrolnitrin inhibition curves, respiration studies, ESR spectra, and the steady-state level of reduction of cytochrome b in the presence and absence of the drug shows that pyrrolnitrin acts to inhibit electron transport in Neurospora mitochondria at multiple sites in the region between ubiquinone and cytochrome b. | Electron spin resonance investigations of mitochondrial electron transport in Neurospora crassa. Characterization of paramagnetic intermediates in a standard strain. 1. Submitochondrial particles from Neurospora strain inl-89601 have been analyzed by electron spin resonance spectroscopy (ESR). Numerous signals due to iron-sulfur proteins are observed at low temperatures. Analysis of these ESR signals at various temperatures allows the assignment of resonances to iron-sulfur centers 1-5 that have been described in other organisms. There are no discrepancies between the signals seen in Neurospora and those described in other organisms and it is likely that Neurospora mitochondria contain the same iron-sulfur centers that are observed elsewhere. 2. NADPH and NADH act to reduce the iron-sulfur centers of respiratory complex I. 3. The drug pyrrolnitrin [3-chloro-4-(2'-nitro-3'-chlorphenyl)pyrrole] is an effective inhibitor of both NADH-supported and succinate-supported electron transport in Neurospora. 4. Analysis of pyrrolnitrin inhibition curves, respiration studies, ESR spectra, and the steady-state level of reduction of cytochrome b in the presence and absence of the drug shows that pyrrolnitrin acts to inhibit electron transport in Neurospora mitochondria at multiple sites in the region between ubiquinone and cytochrome b. | [
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|
PMID:12966 | Interaction of DNA with DNA-binding proteins. The characterization of protein HD from Escherichia coli and its nucleic acid complexes. | DNA-binding protein HD with a monomer molecular weight of 9000 was isolated from Escherichia coli cells. The protein occurs as a tetramer under native conditions and binds to single and double-stranded DNA and also to RNA. DNA complexed with protein HD is a poor template for DNA synthesis by E. coli polymerase I, II or III holoenzyme. Exonuclease III is hindered in degrading HD-protein-covered double-stranded DNA, whereas exonuclease I can digest complexed single-stranded DNA. Transcription is liqhtly stimulated in the presence of protein HD. | Interaction of DNA with DNA-binding proteins. The characterization of protein HD from Escherichia coli and its nucleic acid complexes. DNA-binding protein HD with a monomer molecular weight of 9000 was isolated from Escherichia coli cells. The protein occurs as a tetramer under native conditions and binds to single and double-stranded DNA and also to RNA. DNA complexed with protein HD is a poor template for DNA synthesis by E. coli polymerase I, II or III holoenzyme. Exonuclease III is hindered in degrading HD-protein-covered double-stranded DNA, whereas exonuclease I can digest complexed single-stranded DNA. Transcription is liqhtly stimulated in the presence of protein HD. | [
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|
PMID:12967 | Kinetics of the interaction between aspartic aminotransferase and anions. | The kinetics of the interaction between deionized supernatant aspartic aminotransferase and various anions (cacodylate, phosphate and chloride) were studied by the temperature-jump technique. The anion concentration in the range covered by our experiments does not affect the transamination rate. On the other hand the conformational transition, recently observed at the active site of the enzyme, is hindered by an excess of anions. A single relaxation effect was observed at the enzyme chromophore wavelength in systems containing the aldimine form of the enzyme and the above anions. It is shown that this effect corresponds to the protonation of the chromophore. The relaxation times were of about 10 mus with phosphate, 20-100 mus with cacodylate and 1-2 ms with chloride. The pH and concentration dependence of this effect were studied. The fits of experimental data to a rate equations for various models were tested by a chi2 analysis. The best fit was obtained with models where anions bind rapidly to a site close to the chromophore, so that the pK of the chromophore is affected by anions binding. The rate of the observed relaxation considerably increased when the anion has buffering capacities; this indicates, in the case of cacodylate and phosphate, that the acidic component of the buffer directly exchanges a proton with the enzyme chromophore. | Kinetics of the interaction between aspartic aminotransferase and anions. The kinetics of the interaction between deionized supernatant aspartic aminotransferase and various anions (cacodylate, phosphate and chloride) were studied by the temperature-jump technique. The anion concentration in the range covered by our experiments does not affect the transamination rate. On the other hand the conformational transition, recently observed at the active site of the enzyme, is hindered by an excess of anions. A single relaxation effect was observed at the enzyme chromophore wavelength in systems containing the aldimine form of the enzyme and the above anions. It is shown that this effect corresponds to the protonation of the chromophore. The relaxation times were of about 10 mus with phosphate, 20-100 mus with cacodylate and 1-2 ms with chloride. The pH and concentration dependence of this effect were studied. The fits of experimental data to a rate equations for various models were tested by a chi2 analysis. The best fit was obtained with models where anions bind rapidly to a site close to the chromophore, so that the pK of the chromophore is affected by anions binding. The rate of the observed relaxation considerably increased when the anion has buffering capacities; this indicates, in the case of cacodylate and phosphate, that the acidic component of the buffer directly exchanges a proton with the enzyme chromophore. | [
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|
PMID:12968 | Levansucrase of Bacillus subtilis. Characterization of a stabilized fructosyl-enzyme complex and identification of an aspartly residue as the binding site of the fructosyl group. | A covalently linked fructosyl-enzyme complex was isolated from a reaction mixture of enzyme and sucrose submitted to the quenching effect of a large decrease of the pH. The fructosyl-enzyme bond was shown to be stable under acidic and neutral conditions in the presence of high concentration of urea and of sodium dodecyl sulfate. This intermediate did not transfer at a measurable rate its fructosyl group to the usual fructosyl acceptors of the enzyme reaction under the usual conditions of enzyme activity. However stability measurements of the fructosyl-enzyme bond indicated a marked lability at pH values above 8.5. The apparent rate constant of the hydrolytic reaction of this bond evaluated under the standard state of molar concentration of hydroxide ion was of the same order of magnitude as the apparent rate constant of the hydrolytic reaction of the transient fructosyl-enzyme postulated from the kinetic analysis of levansucrase. Furthermore, nucleophilic agents like imidazole enhanced the hydrolytic reaction of the fructosyl-enzyme bond. Identification of the fructosyl binding site on the enzyme was accomplished by proteolytic hydrolysis of the trapped complex. Peptic digestion followed by pronase digestion released a fructosyl-aspartate compound that we have isolated in a high state of purity. The lability of the fructosyl-aspartate bond under mild alkaline conditions suggested that the fructosyl was linked through an ester bond involving the beta-carboxyl of the aspartate residue. Treatment of the trapped complex with cyanogen bromide released only one fructosylated peptide. The apparent molecular weight of this peptide was estimated to be lower than 10000. | Levansucrase of Bacillus subtilis. Characterization of a stabilized fructosyl-enzyme complex and identification of an aspartly residue as the binding site of the fructosyl group. A covalently linked fructosyl-enzyme complex was isolated from a reaction mixture of enzyme and sucrose submitted to the quenching effect of a large decrease of the pH. The fructosyl-enzyme bond was shown to be stable under acidic and neutral conditions in the presence of high concentration of urea and of sodium dodecyl sulfate. This intermediate did not transfer at a measurable rate its fructosyl group to the usual fructosyl acceptors of the enzyme reaction under the usual conditions of enzyme activity. However stability measurements of the fructosyl-enzyme bond indicated a marked lability at pH values above 8.5. The apparent rate constant of the hydrolytic reaction of this bond evaluated under the standard state of molar concentration of hydroxide ion was of the same order of magnitude as the apparent rate constant of the hydrolytic reaction of the transient fructosyl-enzyme postulated from the kinetic analysis of levansucrase. Furthermore, nucleophilic agents like imidazole enhanced the hydrolytic reaction of the fructosyl-enzyme bond. Identification of the fructosyl binding site on the enzyme was accomplished by proteolytic hydrolysis of the trapped complex. Peptic digestion followed by pronase digestion released a fructosyl-aspartate compound that we have isolated in a high state of purity. The lability of the fructosyl-aspartate bond under mild alkaline conditions suggested that the fructosyl was linked through an ester bond involving the beta-carboxyl of the aspartate residue. Treatment of the trapped complex with cyanogen bromide released only one fructosylated peptide. The apparent molecular weight of this peptide was estimated to be lower than 10000. | [
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|
PMID:12969 | The dissociation of flavin coenzymes from trypsin-solubilized NADPH/Cytochrome c (P-450) reductase of pig-liver microsomes. | The change in fluorescence emission at 520 nm after excitation at 365 nm was used to investigate the effect of pH and ionic strength on the dissociation of flavin cofactors from microsomal NADPH/cytochrome c (P-450) reductase. In the unmodified enzyme both the FAD and FMN moieties appeared to dissociate at a similar rate and followed first-order kinetics. The rate constant for the dissociation was increased by low pH and high ionic strength, particularly in the range pH 4.4-3.8 (0.02 M acetate buffer) where the rate constants increased 80-fold. Modification of the enzyme by treatment with p-chloromercuribenzoate enhanced the rate of flavin dissociation and, in the region of pH 4, resulted in a biphasic increase in fluorescence consistent with two simultaneous parallel first-order dissociations. It was concluded that p-chloromercuribenzoate treatment modified the protein so that the two flavin cofactors dissociated at different rates. Using the measured rate constants for the dissociations, and the known variation in fluorescence of flavin nucleotides with pH, an analogue computer simulation of the dissociation as well as a manual curve-fitting procedure showed that the biphasic response could be explained as a simultaneous rapid dissociation of FAD and a slower loss of FMN from the protein. | The dissociation of flavin coenzymes from trypsin-solubilized NADPH/Cytochrome c (P-450) reductase of pig-liver microsomes. The change in fluorescence emission at 520 nm after excitation at 365 nm was used to investigate the effect of pH and ionic strength on the dissociation of flavin cofactors from microsomal NADPH/cytochrome c (P-450) reductase. In the unmodified enzyme both the FAD and FMN moieties appeared to dissociate at a similar rate and followed first-order kinetics. The rate constant for the dissociation was increased by low pH and high ionic strength, particularly in the range pH 4.4-3.8 (0.02 M acetate buffer) where the rate constants increased 80-fold. Modification of the enzyme by treatment with p-chloromercuribenzoate enhanced the rate of flavin dissociation and, in the region of pH 4, resulted in a biphasic increase in fluorescence consistent with two simultaneous parallel first-order dissociations. It was concluded that p-chloromercuribenzoate treatment modified the protein so that the two flavin cofactors dissociated at different rates. Using the measured rate constants for the dissociations, and the known variation in fluorescence of flavin nucleotides with pH, an analogue computer simulation of the dissociation as well as a manual curve-fitting procedure showed that the biphasic response could be explained as a simultaneous rapid dissociation of FAD and a slower loss of FMN from the protein. | [
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|
PMID:12970 | Metabolism of gamma-glutamyl amino acids and peptides in mouse liver and kidney in vivo. | The metabolism in vivo of gamma-glutamyl amino acids and peptides was studied in the mouse after administration of loading doses of L-gamma-glutamyl-2-aminobutyrate and several other gamma-glutamyl compounds, including glutathione. A great and rapid accumulation of glutamate, glutamine, aspartate and pyrrolidone carboxylate was observed in the kidney. Similarly, after administration of a tracer dose of L-gamma-[14C]glutamyl-L-2-aminobutyrate a rapid incorporation of label into kidney glutamate, glutamine and aspartate was found. These results suggest that both the hydrolytic and gamma-glutamyl transfer reactions catalyzed by gamma-glutamyl transpeptidase are active in the renal handling of gamma-glutamyl compounds. Indirect evidence was obtained that L-gamma-glutamyl-2-aminobutyrate is partially taken up by the kidney cell in an intact form. In contrast to the kidney, administration of several gamma-glutamyl derivatives did not cause an increase in liver glutamate, glutamine and pyrrolidone carboxylate. After administration of L-gamma-glutamyl-2-aminobutyrate only a slight increase in liver aspartate and pyrrolidone carboxylate was observed. Experiments with L-gamma-[14C]glutamyl-L-2-aminobutyrate suggest that this derivative is largely first degraded to its component amino acids (probably in the kidney) before entering into the metabolism of the liver cell. gamma-Glutamyl transpeptidase may function in the metabolism and transport of glutathione and other gamma-glutamyl compounds in a manner analogous to the function of dipeptidases and disaccharidases in the metabolism and transport of dipeptides and disaccharides respectively. | Metabolism of gamma-glutamyl amino acids and peptides in mouse liver and kidney in vivo. The metabolism in vivo of gamma-glutamyl amino acids and peptides was studied in the mouse after administration of loading doses of L-gamma-glutamyl-2-aminobutyrate and several other gamma-glutamyl compounds, including glutathione. A great and rapid accumulation of glutamate, glutamine, aspartate and pyrrolidone carboxylate was observed in the kidney. Similarly, after administration of a tracer dose of L-gamma-[14C]glutamyl-L-2-aminobutyrate a rapid incorporation of label into kidney glutamate, glutamine and aspartate was found. These results suggest that both the hydrolytic and gamma-glutamyl transfer reactions catalyzed by gamma-glutamyl transpeptidase are active in the renal handling of gamma-glutamyl compounds. Indirect evidence was obtained that L-gamma-glutamyl-2-aminobutyrate is partially taken up by the kidney cell in an intact form. In contrast to the kidney, administration of several gamma-glutamyl derivatives did not cause an increase in liver glutamate, glutamine and pyrrolidone carboxylate. After administration of L-gamma-glutamyl-2-aminobutyrate only a slight increase in liver aspartate and pyrrolidone carboxylate was observed. Experiments with L-gamma-[14C]glutamyl-L-2-aminobutyrate suggest that this derivative is largely first degraded to its component amino acids (probably in the kidney) before entering into the metabolism of the liver cell. gamma-Glutamyl transpeptidase may function in the metabolism and transport of glutathione and other gamma-glutamyl compounds in a manner analogous to the function of dipeptidases and disaccharidases in the metabolism and transport of dipeptides and disaccharides respectively. | [
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|
PMID:12971 | Effect of the immediate environment on the reactivity of the essential -SH group of papain. | The effect of the microenvironment on the reactivity of the essential -- SH group of papain was studied by alkylation with methyl iodide and with the more polar iodoacetamide. Rate and activation parameters for these reactions were determined with two forms of the -- SH group: the free mercaptide ion at pH 10.0, and the mercaptide-imidazolium ion-pair at pH 5.5. The ion-pair of papain reacts with methyl iodide at a rate 1470 times less than that of thiolsubtilisin. This surprising difference between the reactivities of the two enzymes suggests that in contrast to thiolsubtilisin, where a non-polar environment enhances the rate, in the case of papain a more polar environment somewhat inhibits the reaction with the non-polar methyl iodide. The positive activation entropy for the papain reaction may indicate an 'ordered' structure of bound water around the sulfur atom. The high rate and the low activation entropy (organized transition state) of the reaction of papain with iodoacetamide can be explained in terms of hydrogen-bond formation between the enzyme and the amide group of the alkylating agent. | Effect of the immediate environment on the reactivity of the essential -SH group of papain. The effect of the microenvironment on the reactivity of the essential -- SH group of papain was studied by alkylation with methyl iodide and with the more polar iodoacetamide. Rate and activation parameters for these reactions were determined with two forms of the -- SH group: the free mercaptide ion at pH 10.0, and the mercaptide-imidazolium ion-pair at pH 5.5. The ion-pair of papain reacts with methyl iodide at a rate 1470 times less than that of thiolsubtilisin. This surprising difference between the reactivities of the two enzymes suggests that in contrast to thiolsubtilisin, where a non-polar environment enhances the rate, in the case of papain a more polar environment somewhat inhibits the reaction with the non-polar methyl iodide. The positive activation entropy for the papain reaction may indicate an 'ordered' structure of bound water around the sulfur atom. The high rate and the low activation entropy (organized transition state) of the reaction of papain with iodoacetamide can be explained in terms of hydrogen-bond formation between the enzyme and the amide group of the alkylating agent. | [
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|
PMID:12972 | Proton-nuclear-magnetic-resonance study of the conformation of neurotoxin II from Middle-Asian cobra (Naja naja oxiana) venom. | A proton nuclear magnetic resonance (NMR) study at 100 and 300 MHz of neurotoxin II from the venom of Middle-Asian cobra Naja naja oxiana has been performed in 2H2O and H2O solutions. By means of chemical modification and double resonance all the aromatic residue resonances have been assigned. From the NMR titration curves, pK values of histidine 4 and histidine 31 residues have been determined. For one of the two neighbouring tryptophan residues pH dependence (in the 2-8-pH range) of the chemical shifts of indole protons has been revealed. According to the different sensitivity of the linewidth of indole NH resonances to pH in H2O solution, the accessibility of each of the tryptophan residues has been estimated. Temperature dependence has been observed for the linewidth of the aromatic resonances of the tyrosine 24 residue. Deuterium exchange rates have been measured for amide protons as well as for C(2)H histidine resonances. The NMR data obtained have allowed the conclusions to be made that the two histidine residues and one of the tryptophan residues should be localized on the surface of the protein globule, that arginine residues should be present in the environment of histidine 4, that histidine 31 and the buried tryptophan are possibly localized in close spatial proximity and that the side chain of tyrosine 24 is buried within the protein globule. | Proton-nuclear-magnetic-resonance study of the conformation of neurotoxin II from Middle-Asian cobra (Naja naja oxiana) venom. A proton nuclear magnetic resonance (NMR) study at 100 and 300 MHz of neurotoxin II from the venom of Middle-Asian cobra Naja naja oxiana has been performed in 2H2O and H2O solutions. By means of chemical modification and double resonance all the aromatic residue resonances have been assigned. From the NMR titration curves, pK values of histidine 4 and histidine 31 residues have been determined. For one of the two neighbouring tryptophan residues pH dependence (in the 2-8-pH range) of the chemical shifts of indole protons has been revealed. According to the different sensitivity of the linewidth of indole NH resonances to pH in H2O solution, the accessibility of each of the tryptophan residues has been estimated. Temperature dependence has been observed for the linewidth of the aromatic resonances of the tyrosine 24 residue. Deuterium exchange rates have been measured for amide protons as well as for C(2)H histidine resonances. The NMR data obtained have allowed the conclusions to be made that the two histidine residues and one of the tryptophan residues should be localized on the surface of the protein globule, that arginine residues should be present in the environment of histidine 4, that histidine 31 and the buried tryptophan are possibly localized in close spatial proximity and that the side chain of tyrosine 24 is buried within the protein globule. | [
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|
PMID:12973 | Magnetic studies on the ferri-haem undecapeptide of cytochrome c. | The pH-dependence of the magnetic moment of a ferri-haem undecapeptide, produced by peptic digestion of cytochrome c, has been measured in aqueous solution using a nuclear magnetic resonance method. Below pH 3 the magnetic moment is consistent with the presence of hydroxo-bridged dimers of high-spin iron(III). Above pH 7 the iron(III) is low-spin, the spin crossover conforming to a simple titration curve with pK 6.3 (n=1). This transition is discussed with reference to spectrophotometric studies of ligand binding at the haem. | Magnetic studies on the ferri-haem undecapeptide of cytochrome c. The pH-dependence of the magnetic moment of a ferri-haem undecapeptide, produced by peptic digestion of cytochrome c, has been measured in aqueous solution using a nuclear magnetic resonance method. Below pH 3 the magnetic moment is consistent with the presence of hydroxo-bridged dimers of high-spin iron(III). Above pH 7 the iron(III) is low-spin, the spin crossover conforming to a simple titration curve with pK 6.3 (n=1). This transition is discussed with reference to spectrophotometric studies of ligand binding at the haem. | [
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|
PMID:12974 | Cyclic nucleotide hydrolysis in the thyroid gland. General properties and key role in the interrelations between concentrations of adenosine 3':5'-monophosphate and guanosine 3':5'-monophosphate. | Phosphodiesterase activities of horse (and dog) thyroid soluble fraction were compared with either cyclic AMP (adenosine 3':3'-monophosphate) or cyclic GMP (guanosine 3':5'-monophosphate) as substrate. Optimal activity for cyclic AMP hydrolysis was observed at pH 8, and at pH 7.6 for cyclic GMP. Increasing concentrations of ethyleneglycol bis(2-aminoethyl)-N,N'-tetraacetic acid inhibited both phosphodiesterase activities; in the presence of exogenous Ca2+, this effect was shifted to higher concentrations of the chelator. In a dialysed supernatant preparation, Ca2+ had no significant stimulatory effect, but both Mg2+ and Mn2+ increased cyclic nucleotides breakdown. Mn2+ promoted the hydrolysis of cyclic AMP more effectively than that of cyclic GMP. For both substrates, substrate velocity curves exhibited a two-slope pattern in a Hofstee plot. Cyclic GMP stimulated cyclic AMP hydrolysis, both nucleotides being at micromolar concentrations. Conversely, at no concentration had cyclic AMP any stimulatory effect on cyclic GMP hydrolysis. 1-Methyl-3-isobutylxanthine and theophylline blocked the activation by cyclic GMP of cyclic GMP of cyclic AMP hydrolysis, whereas Ro 20-1724 (4-(3-butoxy-4-methoxybenzyl)-2-imidazolidinone), a non-methylxanthine inhibitor of phosphodiesterases, did not alter this effect. In dog thyroid slices, carbamoylcholine, which promotes an accumulation of cyclic GMP, inhibits the thyrotropin-induced increase in cyclic AMP. This inhibitory effect of carbamoylcholine was blocked by theophylline and 1-methyl-3-isobutylxanthine, but not by Ro 20-1724. It is suggested that the cholinergic inhibitory effect on cyclic AMP accumulation is mediated by cyclic GMP, through a direct activation of phosphodiesterase activity. | Cyclic nucleotide hydrolysis in the thyroid gland. General properties and key role in the interrelations between concentrations of adenosine 3':5'-monophosphate and guanosine 3':5'-monophosphate. Phosphodiesterase activities of horse (and dog) thyroid soluble fraction were compared with either cyclic AMP (adenosine 3':3'-monophosphate) or cyclic GMP (guanosine 3':5'-monophosphate) as substrate. Optimal activity for cyclic AMP hydrolysis was observed at pH 8, and at pH 7.6 for cyclic GMP. Increasing concentrations of ethyleneglycol bis(2-aminoethyl)-N,N'-tetraacetic acid inhibited both phosphodiesterase activities; in the presence of exogenous Ca2+, this effect was shifted to higher concentrations of the chelator. In a dialysed supernatant preparation, Ca2+ had no significant stimulatory effect, but both Mg2+ and Mn2+ increased cyclic nucleotides breakdown. Mn2+ promoted the hydrolysis of cyclic AMP more effectively than that of cyclic GMP. For both substrates, substrate velocity curves exhibited a two-slope pattern in a Hofstee plot. Cyclic GMP stimulated cyclic AMP hydrolysis, both nucleotides being at micromolar concentrations. Conversely, at no concentration had cyclic AMP any stimulatory effect on cyclic GMP hydrolysis. 1-Methyl-3-isobutylxanthine and theophylline blocked the activation by cyclic GMP of cyclic GMP of cyclic AMP hydrolysis, whereas Ro 20-1724 (4-(3-butoxy-4-methoxybenzyl)-2-imidazolidinone), a non-methylxanthine inhibitor of phosphodiesterases, did not alter this effect. In dog thyroid slices, carbamoylcholine, which promotes an accumulation of cyclic GMP, inhibits the thyrotropin-induced increase in cyclic AMP. This inhibitory effect of carbamoylcholine was blocked by theophylline and 1-methyl-3-isobutylxanthine, but not by Ro 20-1724. It is suggested that the cholinergic inhibitory effect on cyclic AMP accumulation is mediated by cyclic GMP, through a direct activation of phosphodiesterase activity. | [
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|
PMID:12975 | On the optical activity of ionized tyrosyl residues in ovine lutropin. | The effect of alkali on the circular dichroic (CD) spectra of ovine lutropin and its subunits has been studied. Mild alkaline pH induces the appearance of a new optically active band in the 250-nm region of the spectra of lutropin without any detectable alteration in the secondary structure of the protein. This change is reversible and can be correlated with ionization of 2--3 exposed tyrosyl residues in the intact hormone. In a previous report from this laboratory it was concluded that the three exposed tyrosyl residues are located in the alpha subunit, in positions 21, 92 and 93 [Burleigh, B.D., Liu, W.-K, and Ward, D.M. (1976) J. Biol. Chem. 251, 308--315]. Nitration of these residues lowers the pH at which the intensity of the 250-nm band is maximal. The importance of the tyrosyl residues of lutropin alpha (as opposed to those of lutropin beta) is also supported by the similarity of the effect of alkali on the CD spectra of lutropin and lutropin alpha. Further evidence for this involvement was also obtained by a comparison of the alkali-induced changes of refolded lutropin (alpha + beta recombinant) and the product obtained by recombination of des-(92--96)-lutropin alpha (obtained from carboxypeptidase treatment of the alpha-subunit) and lutropin beta. The results indicate that removal of tyrosines alpha 92 and alpha 93 results in a decrease of the intensity of the 235-nm band of ovine lutropin (at pH7.5) as well as that of the 250-nm band observed under alkaline conditions. It is therefore concluded that the 250-nm band observed in alkaline solutions of lutropin arises (at least partially) from the red shift produced in the short-wavelength optically active band of tyrosines alpha 21, alpha 92, and alpha 93 upon ionization. | On the optical activity of ionized tyrosyl residues in ovine lutropin. The effect of alkali on the circular dichroic (CD) spectra of ovine lutropin and its subunits has been studied. Mild alkaline pH induces the appearance of a new optically active band in the 250-nm region of the spectra of lutropin without any detectable alteration in the secondary structure of the protein. This change is reversible and can be correlated with ionization of 2--3 exposed tyrosyl residues in the intact hormone. In a previous report from this laboratory it was concluded that the three exposed tyrosyl residues are located in the alpha subunit, in positions 21, 92 and 93 [Burleigh, B.D., Liu, W.-K, and Ward, D.M. (1976) J. Biol. Chem. 251, 308--315]. Nitration of these residues lowers the pH at which the intensity of the 250-nm band is maximal. The importance of the tyrosyl residues of lutropin alpha (as opposed to those of lutropin beta) is also supported by the similarity of the effect of alkali on the CD spectra of lutropin and lutropin alpha. Further evidence for this involvement was also obtained by a comparison of the alkali-induced changes of refolded lutropin (alpha + beta recombinant) and the product obtained by recombination of des-(92--96)-lutropin alpha (obtained from carboxypeptidase treatment of the alpha-subunit) and lutropin beta. The results indicate that removal of tyrosines alpha 92 and alpha 93 results in a decrease of the intensity of the 235-nm band of ovine lutropin (at pH7.5) as well as that of the 250-nm band observed under alkaline conditions. It is therefore concluded that the 250-nm band observed in alkaline solutions of lutropin arises (at least partially) from the red shift produced in the short-wavelength optically active band of tyrosines alpha 21, alpha 92, and alpha 93 upon ionization. | [
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|
PMID:12976 | Kinetics and regulation of sarcoplasmic reticulum ATPase. | The measurement of ATP binding to the sarcoplasmic reticulum membrane reveals that the calcium pump possesses one high affinity (Kd = 2--3 muM) site. Competition with substrate analogs show the high specifity of that site. At high ATP concentration another class of site can be detected with a much higher dissociation constant (Kd approximately 500 muM). This class of sites is of low specificity and ATP is easily displaced by other polyphosphates. The steady state rate of ATP cleavage is measured in the presence of ATP analogs. It is shown that the catalysis is due to the high affinity site. The activation of the hydrolysis rate at high substrate concentration may be related to the effect of binding of ATP to the weak sites. The effect of ATP analogs for various ATP concentration supports this hypothesis. | Kinetics and regulation of sarcoplasmic reticulum ATPase. The measurement of ATP binding to the sarcoplasmic reticulum membrane reveals that the calcium pump possesses one high affinity (Kd = 2--3 muM) site. Competition with substrate analogs show the high specifity of that site. At high ATP concentration another class of site can be detected with a much higher dissociation constant (Kd approximately 500 muM). This class of sites is of low specificity and ATP is easily displaced by other polyphosphates. The steady state rate of ATP cleavage is measured in the presence of ATP analogs. It is shown that the catalysis is due to the high affinity site. The activation of the hydrolysis rate at high substrate concentration may be related to the effect of binding of ATP to the weak sites. The effect of ATP analogs for various ATP concentration supports this hypothesis. | [
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|
PMID:12977 | Ligand-dependent Bohr effect of Chrionomus hemoglobins. | The O2 and CO Bohr effects of monomeric and dimeric hemoglobins of the insect Chironomus thummi thummi were determined as proton releases upon ligation. For the O2 Bohr effect of the monomeric hemoglobin III a maximum value of 0.20 H+/heme was obtained at pH 7.5. Upon ligation with CO, however, only 0.04 H+/heme were released at the same pH. In agreement with this finding isoelectric focusing experiments revealed different isoelectric points for O2-liganded and CO-liganded states of hemoglobin III. Analogous results were obtained in the cases of the monomeric hemoglobin IV and the dimeric hemoglobins of Chironomus thummi thummi; here O2 Bohr effects of 0.43 and 0.86 H+/heme were observed. For the corresponding CO Bohr effects values of 0.08 and 0.31 H+/heme were obtained respectively. On the basis of the available structural data the reduced CO Bohr effect in hemoglobin III is discussed as arising from a steric hindrance of the CO ligand by the side chain of isoleucine-E11, obstructing the movement of the heme-iron upon reaction with carbon monoxide. It should, however, be noted that ligands, according to their different electron donor and acceptor properties, may generally induce different conformational changes and thus different Bohr effects, in those hemoglobins in which distinct tertiary and/or quaternary constraints have not evolved. The general utilization of CO instead of O2 as allosteric effector is ruled out by the results reported here. | Ligand-dependent Bohr effect of Chrionomus hemoglobins. The O2 and CO Bohr effects of monomeric and dimeric hemoglobins of the insect Chironomus thummi thummi were determined as proton releases upon ligation. For the O2 Bohr effect of the monomeric hemoglobin III a maximum value of 0.20 H+/heme was obtained at pH 7.5. Upon ligation with CO, however, only 0.04 H+/heme were released at the same pH. In agreement with this finding isoelectric focusing experiments revealed different isoelectric points for O2-liganded and CO-liganded states of hemoglobin III. Analogous results were obtained in the cases of the monomeric hemoglobin IV and the dimeric hemoglobins of Chironomus thummi thummi; here O2 Bohr effects of 0.43 and 0.86 H+/heme were observed. For the corresponding CO Bohr effects values of 0.08 and 0.31 H+/heme were obtained respectively. On the basis of the available structural data the reduced CO Bohr effect in hemoglobin III is discussed as arising from a steric hindrance of the CO ligand by the side chain of isoleucine-E11, obstructing the movement of the heme-iron upon reaction with carbon monoxide. It should, however, be noted that ligands, according to their different electron donor and acceptor properties, may generally induce different conformational changes and thus different Bohr effects, in those hemoglobins in which distinct tertiary and/or quaternary constraints have not evolved. The general utilization of CO instead of O2 as allosteric effector is ruled out by the results reported here. | [
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|
PMID:12978 | Lysozyme from the insect Ceratitis capitata eggs. | 1. Lysozyme from eggs of the Dipterous Ceratitis capitata (Wiedeman) has been purified by ion-exchange chromatography and gel filtration and its physicochemical properties have been investigated. This is the first insect lysozyme characterized so far and it exhibits some properties different to those described for other animal lysozymes. 2. Lysozyme from the insect eggs has a molecular weight of about 23200 and a sedimentation coefficient of 2.4 S. Molecular weight determination by sodium dedecylsulphate gel electrophoresis indicates that the molecule consists of a single polypeptide chain. 3. This lysozyme preparation shows notable stability at acidic pH values and lability at alkline pH values. It shows a single optimum pH at about 6.5.4. Chitinase/muramidase specific activity ratio is around 350 times higher for the insect lysozyme than for the hen egg-white enzyme. 5. The amino-acid composition shows the presence of one tryptophan residue per molecule of enzyme. This fact differentiates the lysozyme from insect eggs from other animal and plant lysozymes. From the amino acid composition, the absorption coefficient and the partial specific volume are calculated. 6. Glycine is the N-terminal residue. | Lysozyme from the insect Ceratitis capitata eggs. 1. Lysozyme from eggs of the Dipterous Ceratitis capitata (Wiedeman) has been purified by ion-exchange chromatography and gel filtration and its physicochemical properties have been investigated. This is the first insect lysozyme characterized so far and it exhibits some properties different to those described for other animal lysozymes. 2. Lysozyme from the insect eggs has a molecular weight of about 23200 and a sedimentation coefficient of 2.4 S. Molecular weight determination by sodium dedecylsulphate gel electrophoresis indicates that the molecule consists of a single polypeptide chain. 3. This lysozyme preparation shows notable stability at acidic pH values and lability at alkline pH values. It shows a single optimum pH at about 6.5.4. Chitinase/muramidase specific activity ratio is around 350 times higher for the insect lysozyme than for the hen egg-white enzyme. 5. The amino-acid composition shows the presence of one tryptophan residue per molecule of enzyme. This fact differentiates the lysozyme from insect eggs from other animal and plant lysozymes. From the amino acid composition, the absorption coefficient and the partial specific volume are calculated. 6. Glycine is the N-terminal residue. | [
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|
PMID:12979 | Transport of cyclitols by a proton symport in Klebsiella aerogenes. | The respiration and the ATP content of Klebsiella aerogenes in the presence of various inhibitors were compared to the transport of scyllo-inositol. The ATPase was found to be inhibited by dicyclohexyl carbodiimide. The transport has been tested in anaerobiosis and aerobiosis. From the results obtained it is concluded that either ATP or respiration can sustain the transport activity in independent manner. 2. The energy derived from the respiratory chain reactions or the ATP hydrolysis results in electrogenic extrusion of protons. The electrochemical potential created drives the accumulation of scyllo-inositol, as shown by an increase of pH of the medium on addition of the substrate to cells in anaerobiosis. With non-induced cells no change in pH occurs, which demonstrates that proton flow is really linked to the transport. No H+/Na+ or K+ exchange is observed and the proton conductor carbonylcyanide m-chlorophenylhydrazone abolishes the pH shift caused by substrate addition. The stoichiometry of the symport H+/cyclitol is 1 and the half-maximum value of the pH variation as a function of the amount of scyllo-inositol added corresponds to a concentration of scyllo-inositol very close to the KT of influx. | Transport of cyclitols by a proton symport in Klebsiella aerogenes. The respiration and the ATP content of Klebsiella aerogenes in the presence of various inhibitors were compared to the transport of scyllo-inositol. The ATPase was found to be inhibited by dicyclohexyl carbodiimide. The transport has been tested in anaerobiosis and aerobiosis. From the results obtained it is concluded that either ATP or respiration can sustain the transport activity in independent manner. 2. The energy derived from the respiratory chain reactions or the ATP hydrolysis results in electrogenic extrusion of protons. The electrochemical potential created drives the accumulation of scyllo-inositol, as shown by an increase of pH of the medium on addition of the substrate to cells in anaerobiosis. With non-induced cells no change in pH occurs, which demonstrates that proton flow is really linked to the transport. No H+/Na+ or K+ exchange is observed and the proton conductor carbonylcyanide m-chlorophenylhydrazone abolishes the pH shift caused by substrate addition. The stoichiometry of the symport H+/cyclitol is 1 and the half-maximum value of the pH variation as a function of the amount of scyllo-inositol added corresponds to a concentration of scyllo-inositol very close to the KT of influx. | [
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|
PMID:12980 | Tissue adhesives: their use in urology. | Tissue adhesives have certain advantages and should be used only for nephropexy and urethropexy but not for orchiopexy. Because of possible incrustation it should be avoided in the urinary collecting system. | Tissue adhesives: their use in urology. Tissue adhesives have certain advantages and should be used only for nephropexy and urethropexy but not for orchiopexy. Because of possible incrustation it should be avoided in the urinary collecting system. | [
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|
PMID:12983 | Acute hypotensive effect of combined beta1-adrenoceptor blockade and beta2-adrenoceptor stimulation in spontaneously hypertensive rats (SHR). | The effect on heart rate (HR) and blood pressure (BP) of metoprolol, propranolol and terbutaline, applied alone or in combinations was studied in spontaneously hypertensive rats. Terbutaline had little effect on BP and HR. Propranolol combined with terbutaline had no effect while metoprolol combined with terbutaline decreased BP by 48 mm Hg without affecting HR. Thus the beta2-mediated increase in peripheral vascular resistance after terbutaline was revealed by a drop in BP after beta1-blockade by metoprolol, but not when both beta1-and beta2-receptors were blocked by propranolol. | Acute hypotensive effect of combined beta1-adrenoceptor blockade and beta2-adrenoceptor stimulation in spontaneously hypertensive rats (SHR). The effect on heart rate (HR) and blood pressure (BP) of metoprolol, propranolol and terbutaline, applied alone or in combinations was studied in spontaneously hypertensive rats. Terbutaline had little effect on BP and HR. Propranolol combined with terbutaline had no effect while metoprolol combined with terbutaline decreased BP by 48 mm Hg without affecting HR. Thus the beta2-mediated increase in peripheral vascular resistance after terbutaline was revealed by a drop in BP after beta1-blockade by metoprolol, but not when both beta1-and beta2-receptors were blocked by propranolol. | [
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|
PMID:12984 | Iontophoretic studies of histamine and histamine antagonists in the feline vestibular nuclei. | The activity of single neurons in the vestibular neuronal complex of midcollicular decerebrate, decerebellectomized cats were recorded and their responsiveness to iontophoretically applied histamine and other agents determined. The majority of the cells tested were inhibited by iontophoresis of histamine while 24% were excited by this agent. Neurons exhibiting inhibitory responses were widely distributed throughout the four vestibular nuclei and adjacent reticular formation whereas excitatory responses to histamine were obtained mainly in the region of the lateral vestibular nucleus. The H2-receptor blocking agents metiamide and cimetidine were examined as to their actions on spontaneously firing cells and cells affected by histamine. Metiamide was selective in blocking histamine-induced inhibition but not excitation while cimetidine was ineffective in blocking either response. These results suggest that histamine has both inhibitory and excitatory actions on brain stem neurons and metiamide is an effective antagonist of histamine-induced inhibition. | Iontophoretic studies of histamine and histamine antagonists in the feline vestibular nuclei. The activity of single neurons in the vestibular neuronal complex of midcollicular decerebrate, decerebellectomized cats were recorded and their responsiveness to iontophoretically applied histamine and other agents determined. The majority of the cells tested were inhibited by iontophoresis of histamine while 24% were excited by this agent. Neurons exhibiting inhibitory responses were widely distributed throughout the four vestibular nuclei and adjacent reticular formation whereas excitatory responses to histamine were obtained mainly in the region of the lateral vestibular nucleus. The H2-receptor blocking agents metiamide and cimetidine were examined as to their actions on spontaneously firing cells and cells affected by histamine. Metiamide was selective in blocking histamine-induced inhibition but not excitation while cimetidine was ineffective in blocking either response. These results suggest that histamine has both inhibitory and excitatory actions on brain stem neurons and metiamide is an effective antagonist of histamine-induced inhibition. | [
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|
PMID:12985 | Comparison of adiphenine and TRH effects on TSH release by rat pituitary in vitro. | The mechanism of action of adiphenine on in vitro rat anterior pituitary TSH release was compared to that of the physiological stimulator TRH. The comparative study showed that adiphenine and TRH were able to increase TSH release in a dose-dependent manner, had similar time courses of action for equipotent stimulating concentrations and produced similar aspects of stimulated TSH cells. However, there were several differences between the effects of adiphenine and TRH. Adiphenine action was inhibited by 20 mM K+; was not calcium dependent; was inhibited by neither thyroid hormones nor somatostatin; was little affected by energy depression. It is concluded that adiphenine probably acts near the ultimate steps of the TSH release pathway and could be a useful pharmacological tool for studying the mechanism of TSH release. | Comparison of adiphenine and TRH effects on TSH release by rat pituitary in vitro. The mechanism of action of adiphenine on in vitro rat anterior pituitary TSH release was compared to that of the physiological stimulator TRH. The comparative study showed that adiphenine and TRH were able to increase TSH release in a dose-dependent manner, had similar time courses of action for equipotent stimulating concentrations and produced similar aspects of stimulated TSH cells. However, there were several differences between the effects of adiphenine and TRH. Adiphenine action was inhibited by 20 mM K+; was not calcium dependent; was inhibited by neither thyroid hormones nor somatostatin; was little affected by energy depression. It is concluded that adiphenine probably acts near the ultimate steps of the TSH release pathway and could be a useful pharmacological tool for studying the mechanism of TSH release. | [
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|
PMID:12986 | Perlapine and dopamine metabolism: prediction of antipsychotic efficacy. | A model for the prediction of antipsychotic efficacy based on the dose-dependent increase in levels of 3,4-dihydroxyphenylacetic acid (DOPAC) in the striatum and tuberculum olfactorium of the rat is presented. The effect of perlapine, a sleep-promoting and sedative agent reported to lack antipsychotic efficacy, was compared in this system to haloperidol, chlorpromazine and clozapine. All four drugs produced a dose-dependent increase in DOPAC in the two dopamine-rich structures. The potency of perlapine was similar to that of chlorpromazine. Dopamine, assayed in the striatum and tuberculum olfactorium by a new gas chromatographic procedure was not altered by perlapine. The time--action curves for perlapine and clozapine were virtually identical both in the striatum and in the tuberculum olfactorium. All four drugs also elevated homovanillic acid to a similar extent. These results indicate that perlapine should be re-evaluated clinically. We predict that such trials will reveal that perlapine does possess antipsychotic efficacy. | Perlapine and dopamine metabolism: prediction of antipsychotic efficacy. A model for the prediction of antipsychotic efficacy based on the dose-dependent increase in levels of 3,4-dihydroxyphenylacetic acid (DOPAC) in the striatum and tuberculum olfactorium of the rat is presented. The effect of perlapine, a sleep-promoting and sedative agent reported to lack antipsychotic efficacy, was compared in this system to haloperidol, chlorpromazine and clozapine. All four drugs produced a dose-dependent increase in DOPAC in the two dopamine-rich structures. The potency of perlapine was similar to that of chlorpromazine. Dopamine, assayed in the striatum and tuberculum olfactorium by a new gas chromatographic procedure was not altered by perlapine. The time--action curves for perlapine and clozapine were virtually identical both in the striatum and in the tuberculum olfactorium. All four drugs also elevated homovanillic acid to a similar extent. These results indicate that perlapine should be re-evaluated clinically. We predict that such trials will reveal that perlapine does possess antipsychotic efficacy. | [
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|
PMID:12988 | Pharmacology of a new phthalane (Lu 10-171), with specific 5-HT uptake inhibiting properties. | The pharmacological profile of a new bicyclic substance, Lu 10-171 (1-(3-(dimethylamino)propyl)-1-(p-fluorophenyl)-5-phthalancarbonitril), is described and compared with that of existing tricyclic thymoleptics. In mice and rats the compound exhibited marked 5-HT potentiating properties both in vivo and in vitro, being 5-10 times as active as chlorimipramine. The tests included 5-HT-, 5-HTP- and tryptophan-potentiation. In monoamine oxidase inhibitor treated dogs and rabbits the compound caused a marked hyperthermia. In rabbits this effect was completely blocked by pretreatment with the tryptophan hydroxylase inhibitor, p-chlorophenylalanine. Hyperthermia induced by the central catecholamine displacing substance H 77/77 in rats was not affected by Lu 10-171, whereas the substance abolished the temperature rise induced by H 75/12. Reserpine- and tetrabenazine-induced ptosis and tetrabenazine-induced immobility in mice were antagonized by relatively low doses of existing tricyclic thymoleptics, whereas Lu 10-171 was very weak in this respect. Very weak in vitro anticholinergic and antihistaminergic properties were also registered for Lu 10-171. It is concluded that Lu 10-171 is a very potent and highly specific potentiator of 5-HT both in vivo and in vitro probably due to inhibition of 5-HT uptake. Thus this compound might be a useful agent in studying the role of 5-HT neurone systems in the control of mood. The substance does not possess the NA potentiating and anticholinergic and antihistaminergic properties characteristic of the tricyclic antidepressants. | Pharmacology of a new phthalane (Lu 10-171), with specific 5-HT uptake inhibiting properties. The pharmacological profile of a new bicyclic substance, Lu 10-171 (1-(3-(dimethylamino)propyl)-1-(p-fluorophenyl)-5-phthalancarbonitril), is described and compared with that of existing tricyclic thymoleptics. In mice and rats the compound exhibited marked 5-HT potentiating properties both in vivo and in vitro, being 5-10 times as active as chlorimipramine. The tests included 5-HT-, 5-HTP- and tryptophan-potentiation. In monoamine oxidase inhibitor treated dogs and rabbits the compound caused a marked hyperthermia. In rabbits this effect was completely blocked by pretreatment with the tryptophan hydroxylase inhibitor, p-chlorophenylalanine. Hyperthermia induced by the central catecholamine displacing substance H 77/77 in rats was not affected by Lu 10-171, whereas the substance abolished the temperature rise induced by H 75/12. Reserpine- and tetrabenazine-induced ptosis and tetrabenazine-induced immobility in mice were antagonized by relatively low doses of existing tricyclic thymoleptics, whereas Lu 10-171 was very weak in this respect. Very weak in vitro anticholinergic and antihistaminergic properties were also registered for Lu 10-171. It is concluded that Lu 10-171 is a very potent and highly specific potentiator of 5-HT both in vivo and in vitro probably due to inhibition of 5-HT uptake. Thus this compound might be a useful agent in studying the role of 5-HT neurone systems in the control of mood. The substance does not possess the NA potentiating and anticholinergic and antihistaminergic properties characteristic of the tricyclic antidepressants. | [
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|
PMID:12989 | Effects of cimetidine and atropine sulfate on gastric secretion and healing of gastric and duodenal ulcers in rats. | Cimetidine, a new histamine H2-receptor antagonist (50 or 100 mg/kg) and atropine sulfate (15 mg/kg) given intraduodenally, markedly inhibited gastric secretion in pylorus-ligated rats. Cimetidine (100 or 200 mg/kg/day) given for 10 or 12 consecutive days orally in two divided doses, significantly promoted the healing rate of both gastric and duodenal ulcers induced in rats. Atropine (30 mg/kg/day) also significantly accelerated the healing of duodenal ulcers but failed to affect gastric ulcers. | Effects of cimetidine and atropine sulfate on gastric secretion and healing of gastric and duodenal ulcers in rats. Cimetidine, a new histamine H2-receptor antagonist (50 or 100 mg/kg) and atropine sulfate (15 mg/kg) given intraduodenally, markedly inhibited gastric secretion in pylorus-ligated rats. Cimetidine (100 or 200 mg/kg/day) given for 10 or 12 consecutive days orally in two divided doses, significantly promoted the healing rate of both gastric and duodenal ulcers induced in rats. Atropine (30 mg/kg/day) also significantly accelerated the healing of duodenal ulcers but failed to affect gastric ulcers. | [
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|
PMID:12990 | Relaxation of coronary artery strips by adenosine and acidosis. | Cumulative dose-response curves of Ca2+-induced tension increments were studied in K+-depolarized helical strips of dog coronary arteries. Adenosine 10(-4) M reduced the Ca2+ sensitivity of the strips without altering the maximal tension with full Ca2+ activation. In contrast, acidosis of pH 7.05 significantly diminished the maximal tension with full Ca2+ activation. The relaxing effect of acidosis was almost completely abolished by 10(-4) M adenosine. It is concluded that adenosine inhibits Ca2+ influx, whereas acidosis depresses the contractile process of vascular smooth muscle directly. | Relaxation of coronary artery strips by adenosine and acidosis. Cumulative dose-response curves of Ca2+-induced tension increments were studied in K+-depolarized helical strips of dog coronary arteries. Adenosine 10(-4) M reduced the Ca2+ sensitivity of the strips without altering the maximal tension with full Ca2+ activation. In contrast, acidosis of pH 7.05 significantly diminished the maximal tension with full Ca2+ activation. The relaxing effect of acidosis was almost completely abolished by 10(-4) M adenosine. It is concluded that adenosine inhibits Ca2+ influx, whereas acidosis depresses the contractile process of vascular smooth muscle directly. | [
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|
PMID:12993 | Red blood cell selection in chimeric mice. | Starch gel electrophoresis of a large number of tissues and organs from C3H in equilibrium C57BL aggregation chimeras suggests that the C57BL red blood cell population predominates, whereas for other tissues the proportions of the two components are more nearly equal. A similar predominance of (C57BL X C3H)F1 red blood cells is seen in (C57BL X C3H)F1 in equilibrium Recessive chimeras. Analysis of blood samples taken from the same animals at different times suggests that a temporal shift in the proportions of the two component red cell populations occurs in some adult chimeras and results in an unbalanced chimeric phenotype. It is suggested that differential mitotic activity contributes to strain-dependent, tissue-specific selection pressures in the erythropoietic tissue. | Red blood cell selection in chimeric mice. Starch gel electrophoresis of a large number of tissues and organs from C3H in equilibrium C57BL aggregation chimeras suggests that the C57BL red blood cell population predominates, whereas for other tissues the proportions of the two components are more nearly equal. A similar predominance of (C57BL X C3H)F1 red blood cells is seen in (C57BL X C3H)F1 in equilibrium Recessive chimeras. Analysis of blood samples taken from the same animals at different times suggests that a temporal shift in the proportions of the two component red cell populations occurs in some adult chimeras and results in an unbalanced chimeric phenotype. It is suggested that differential mitotic activity contributes to strain-dependent, tissue-specific selection pressures in the erythropoietic tissue. | [
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PMID:13002 | Follow-up study of oral contraceptive acceptors in Howrah District in India. | In the Howrah District in India, three clinics--one in each of the urban, slum, and rural areas of the city--were initiated by the Humanity Association of Howrah in November of 1968 to supply oral contraceptives (OCs) to women from 15 to 45 years of age. The project was discontinued in September, 1972. Of the 1700 patients still active when the project ended, 1527 were contacted for the follow-up survey. Findings indicate that most women in this district were satisfied with OCs and would continue to use them if they were available. In corroboration of this, it was found that 43% of the women had used OC'S obtained from other sources after the project was discontinued. While 35.5% of the women who used no contraceptive method after project ended reported becoming pregnant or suspected that they were pregnant at the time of the interview, only 4.2% of those who reported using some form of contraception reported pregnancy or suspected pregnancy. The demographic impact of the project will be evaluated on the basis of data to be obtained in a subsequent survey of the same communities. | Follow-up study of oral contraceptive acceptors in Howrah District in India. In the Howrah District in India, three clinics--one in each of the urban, slum, and rural areas of the city--were initiated by the Humanity Association of Howrah in November of 1968 to supply oral contraceptives (OCs) to women from 15 to 45 years of age. The project was discontinued in September, 1972. Of the 1700 patients still active when the project ended, 1527 were contacted for the follow-up survey. Findings indicate that most women in this district were satisfied with OCs and would continue to use them if they were available. In corroboration of this, it was found that 43% of the women had used OC'S obtained from other sources after the project was discontinued. While 35.5% of the women who used no contraceptive method after project ended reported becoming pregnant or suspected that they were pregnant at the time of the interview, only 4.2% of those who reported using some form of contraception reported pregnancy or suspected pregnancy. The demographic impact of the project will be evaluated on the basis of data to be obtained in a subsequent survey of the same communities. | [
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|
PMID:13003 | A comparison of flexible and nonflexible plastic cannulae for performing first trimester abortion. | The safety and effectiveness of flexible and nonflexible plastic cannulae used in vacuum aspiration abortion for patients at 6 to 12 weeks' gestation were evaluated in a study of 1100 physically healthy women in Ljublijana, Yugoslavia. To minimize study biases, each type of cannulae was randomly assigned to 550 patients. To minimize evaluator bias, a second physician who was kept unaware of which cannula was used for particular patient was responsible for evaluating patients after the procedures. Both groups of patients were similar with respect to age, parity, marital status, formal education and gestational age. Higher rates of retained tissue and cannula obstruction were obtained with the flexible cannula. The two types of cannulae were not significantly different with respect to other criteria of evaluation. | A comparison of flexible and nonflexible plastic cannulae for performing first trimester abortion. The safety and effectiveness of flexible and nonflexible plastic cannulae used in vacuum aspiration abortion for patients at 6 to 12 weeks' gestation were evaluated in a study of 1100 physically healthy women in Ljublijana, Yugoslavia. To minimize study biases, each type of cannulae was randomly assigned to 550 patients. To minimize evaluator bias, a second physician who was kept unaware of which cannula was used for particular patient was responsible for evaluating patients after the procedures. Both groups of patients were similar with respect to age, parity, marital status, formal education and gestational age. Higher rates of retained tissue and cannula obstruction were obtained with the flexible cannula. The two types of cannulae were not significantly different with respect to other criteria of evaluation. | [
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|
PMID:13004 | Evaluation of trained midwives in a copper-T IUD insertion Program in Isfahan, Iran. | From four centers in Isfahan, data from 252 insertions of the Cu-T-200 made by midwives and 646 insertions of the same device made by doctors are compared. Although the net cumulative one-year continuation rate for women who had a copper-T inserted by a midwife is significantly lower than for women who had a copper-T inserted by a doctor there are no significant differences between the one-year event rates for the two groups of patients. These data suggest that an expanded role for midwives in IUD insertion programs would be an efficient use of health personnel. | Evaluation of trained midwives in a copper-T IUD insertion Program in Isfahan, Iran. From four centers in Isfahan, data from 252 insertions of the Cu-T-200 made by midwives and 646 insertions of the same device made by doctors are compared. Although the net cumulative one-year continuation rate for women who had a copper-T inserted by a midwife is significantly lower than for women who had a copper-T inserted by a doctor there are no significant differences between the one-year event rates for the two groups of patients. These data suggest that an expanded role for midwives in IUD insertion programs would be an efficient use of health personnel. | [
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|
PMID:13005 | Herpes type-2 viruses and gynaecological malignancies. | Numerous sero-epidemiologic studies have noted an association between Herpes Type 2 (HT-2) virus and carcinoma of the cervix. In a study to evaluate the role of this virus, if any, on the etiology of extra cervical pelvic malignancies in Ibadan, the prevalence of HT-2 virus antibodies was found not to be significantly different in patients with extra cervical pelvic malignancies (carcinoma of the vulva and malignant trophoblastic disease) and cases of chronic cervicitis when compared with healthy controls. It was therefore concluded that no association could be found between HT-2 virus and extra cervical pelvic malignancies. | Herpes type-2 viruses and gynaecological malignancies. Numerous sero-epidemiologic studies have noted an association between Herpes Type 2 (HT-2) virus and carcinoma of the cervix. In a study to evaluate the role of this virus, if any, on the etiology of extra cervical pelvic malignancies in Ibadan, the prevalence of HT-2 virus antibodies was found not to be significantly different in patients with extra cervical pelvic malignancies (carcinoma of the vulva and malignant trophoblastic disease) and cases of chronic cervicitis when compared with healthy controls. It was therefore concluded that no association could be found between HT-2 virus and extra cervical pelvic malignancies. | [
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|
PMID:13006 | Feto-maternal concentrations of diazepam and W-demethyldiazepam after intra-amniotic diazepam injection. | Ten milligrams of diazepam were injected intraamniotically in 8 mothers prior to therapeutic abortion between 12 and 19 weeks. The diazepam concentrations in the maternal plasma were comparable to those found after the same intramuscular diazepam dose to the mother. The concentration of diazepam in the amniotic fluid 12 to 18 hours after the injection was no longer significantly higher than in the maternal plasma. The concentrations of diazepam in the fetal plasma, liver and brain were comparable to the concentrations resulting from a 10 mg intramuscular diazepam dose to the mother about 2 hours before legal abortion. The feto-maternal ratio of diazepam was of same magnitude as after the intramuscular application to the mother. The results indicate that the disappearance of diazepam from the amniotic fluid in this stage of pregnancy occurs extraplacentally, through the mambranes into the uterine circulation. In the treatment of a fetus with drugs having properties similar to diazepam, intra-amniotic administration is no better than intramuscular administration to the mother. | Feto-maternal concentrations of diazepam and W-demethyldiazepam after intra-amniotic diazepam injection. Ten milligrams of diazepam were injected intraamniotically in 8 mothers prior to therapeutic abortion between 12 and 19 weeks. The diazepam concentrations in the maternal plasma were comparable to those found after the same intramuscular diazepam dose to the mother. The concentration of diazepam in the amniotic fluid 12 to 18 hours after the injection was no longer significantly higher than in the maternal plasma. The concentrations of diazepam in the fetal plasma, liver and brain were comparable to the concentrations resulting from a 10 mg intramuscular diazepam dose to the mother about 2 hours before legal abortion. The feto-maternal ratio of diazepam was of same magnitude as after the intramuscular application to the mother. The results indicate that the disappearance of diazepam from the amniotic fluid in this stage of pregnancy occurs extraplacentally, through the mambranes into the uterine circulation. In the treatment of a fetus with drugs having properties similar to diazepam, intra-amniotic administration is no better than intramuscular administration to the mother. | [
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|
PMID:13007 | A comparison of laparoscopy and culdoscopy for internal sterilization. | In recent years, the increased demand for sterilization by women who have achieved their desired family size has emphasized the need to improve both existing methods of tubal occlusion and the means of access to the Fallopian tubes. Utilization of diagnostic instruments such as the laparoscope and culdoscope to perform sterilization minimizes the trauma associated with standard laparotomy and colpotomy and promises to reduce morbidity occurring as a result of sterilization. In order to evaluate and compare the improved techniques of laparoscopy and culdoscopy for elective interval sterilization, 722 women were studied between January and August of 1973 at the Siriraj Hospital in Bangkok. For 279 patients (Group I), sterilization was performed by culdoscopic tubal ligation using a modified Pomeroy technique; for 443 patients (Group II), the procedure used was laparoscopic tubal cauterization and cutting. All procedures were performed using local anesthesia on an outpatient basis. Complication rates and required surgical time were similar for both procedures and compared favorably with rates reported by other investigators. Because of a low incidence of complications and the elimination of the need for general anesthesia and hospitalization, both endoscopic procedures appear to be of particular value in developing countries where hospital facilities and physician time are in short supply. | A comparison of laparoscopy and culdoscopy for internal sterilization. In recent years, the increased demand for sterilization by women who have achieved their desired family size has emphasized the need to improve both existing methods of tubal occlusion and the means of access to the Fallopian tubes. Utilization of diagnostic instruments such as the laparoscope and culdoscope to perform sterilization minimizes the trauma associated with standard laparotomy and colpotomy and promises to reduce morbidity occurring as a result of sterilization. In order to evaluate and compare the improved techniques of laparoscopy and culdoscopy for elective interval sterilization, 722 women were studied between January and August of 1973 at the Siriraj Hospital in Bangkok. For 279 patients (Group I), sterilization was performed by culdoscopic tubal ligation using a modified Pomeroy technique; for 443 patients (Group II), the procedure used was laparoscopic tubal cauterization and cutting. All procedures were performed using local anesthesia on an outpatient basis. Complication rates and required surgical time were similar for both procedures and compared favorably with rates reported by other investigators. Because of a low incidence of complications and the elimination of the need for general anesthesia and hospitalization, both endoscopic procedures appear to be of particular value in developing countries where hospital facilities and physician time are in short supply. | [
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PMID:13008 | Burkitt's lymphoma presenting during lactation. | The diagnostic difficulties and treatment failures of Burkitt's lymphoma manifesting during lactation are presented. All 5 cases presented as breast swelling, mimicking mastitis carcinomatosa; those patients actively lactating had fulminant disease, fatal within a few weeks. There was widespread involvement of internal organs. The importance of early correct diagnosis was emphasized and clinicians are alerted to the possibility of Burkitt's lymphoma occurring during lactation without jaw or abdominal presentation. Whether the fulminant manifestation of Burkitt's lymphoma occurring during lactation was coincidental or not, the possibility exists that a favourable milieu for the tumour growth might have been produced or the body immune mechanism lowered. | Burkitt's lymphoma presenting during lactation. The diagnostic difficulties and treatment failures of Burkitt's lymphoma manifesting during lactation are presented. All 5 cases presented as breast swelling, mimicking mastitis carcinomatosa; those patients actively lactating had fulminant disease, fatal within a few weeks. There was widespread involvement of internal organs. The importance of early correct diagnosis was emphasized and clinicians are alerted to the possibility of Burkitt's lymphoma occurring during lactation without jaw or abdominal presentation. Whether the fulminant manifestation of Burkitt's lymphoma occurring during lactation was coincidental or not, the possibility exists that a favourable milieu for the tumour growth might have been produced or the body immune mechanism lowered. | [
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|
PMID:13009 | Polycystic ovaries. Presentation and response to wedge resection. | Polycystic ovarian disease has been recognised for quite a long time, although its presentations have varied from place to place. In a report of cases of polycystic ovaries seen in the University College Hospital, Ibadan, Nigeria, over a six-year period, it was shown that the syndrome of Stein-Leventhal identifies only a very small and probably artificial fraction of the much larger number of patients who actually have polycystic ovarian disease. It was further shown that the benefit derived from wedge resection in our cases was marked. Of the cases that were subsequently seen at follow-up, there was restoration of regular ovulatory menstrual flow in 83.3% and achievement of pregnancy in 33.3%. Hence, the observation that wedge resection is beneficial, and at times curative in polycystic ovarian disease seems to have a sound foundation. | Polycystic ovaries. Presentation and response to wedge resection. Polycystic ovarian disease has been recognised for quite a long time, although its presentations have varied from place to place. In a report of cases of polycystic ovaries seen in the University College Hospital, Ibadan, Nigeria, over a six-year period, it was shown that the syndrome of Stein-Leventhal identifies only a very small and probably artificial fraction of the much larger number of patients who actually have polycystic ovarian disease. It was further shown that the benefit derived from wedge resection in our cases was marked. Of the cases that were subsequently seen at follow-up, there was restoration of regular ovulatory menstrual flow in 83.3% and achievement of pregnancy in 33.3%. Hence, the observation that wedge resection is beneficial, and at times curative in polycystic ovarian disease seems to have a sound foundation. | [
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|
PMID:13010 | Cervical pregnancy: report of three cases and a review of the literature. | Three cases of cervical pregnancy are reported and the literature is reviewed. The incidence is found to be increasing and it was felt to be related to the increasing number of legal or therapeutic abortions, or other surgical procedures on the cervix and endometrial cavity, resulting in unsuitable endometrium for implantation of a fertilized ovum. | Cervical pregnancy: report of three cases and a review of the literature. Three cases of cervical pregnancy are reported and the literature is reviewed. The incidence is found to be increasing and it was felt to be related to the increasing number of legal or therapeutic abortions, or other surgical procedures on the cervix and endometrial cavity, resulting in unsuitable endometrium for implantation of a fertilized ovum. | [
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|
PMID:13011 | Pelvic actinomycosis. | Case report of tubo-ovarian abscess due to Actinomyces israeli is presented with revision of the literature with regard to pathogenesis, diagnostic difficulties and treatment. Diagnosis was established by culturing the organism from exudate obtained during surgery. The pathogenesis of pelvic actinomycosis is still controversial. Penetration of the GI tract with subsequent infection of the pelvic viscera seems to be the most likely mode of infection. Penicillin has an important role in the treatment of this disease. It does not cure, but retards the course of the infection. Surgical extirpation of infected tissue in combination with penicillin offers the best therapeutic results. When chronic pelvic inflammatory disease does not respond to therapy, when the sedimentation rate remains high, and the patient's general debility is progressive, an actinomycotic infection should be suspected. | Pelvic actinomycosis. Case report of tubo-ovarian abscess due to Actinomyces israeli is presented with revision of the literature with regard to pathogenesis, diagnostic difficulties and treatment. Diagnosis was established by culturing the organism from exudate obtained during surgery. The pathogenesis of pelvic actinomycosis is still controversial. Penetration of the GI tract with subsequent infection of the pelvic viscera seems to be the most likely mode of infection. Penicillin has an important role in the treatment of this disease. It does not cure, but retards the course of the infection. Surgical extirpation of infected tissue in combination with penicillin offers the best therapeutic results. When chronic pelvic inflammatory disease does not respond to therapy, when the sedimentation rate remains high, and the patient's general debility is progressive, an actinomycotic infection should be suspected. | [
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|
PMID:13012 | Diagnosis of iron deficiency anaemia among Nigerian pregnant women by serum iron/T.I.B.C. determination. | Fifty-five patients have been investigated for anaemia in pregnancy. Using the serum iron/T.I.B.C. ratio as a diagnostic index it has been found that iron deficiency exists in 60% of our expectant mothers with mild anaemia. This type of anaemia was more common in multiparous women and more frequent in the first and second trimesters of pregnancy, There is, therefore, a strong indication for the routine administration of iron supplements to our women during pregnancy and the puerperium. | Diagnosis of iron deficiency anaemia among Nigerian pregnant women by serum iron/T.I.B.C. determination. Fifty-five patients have been investigated for anaemia in pregnancy. Using the serum iron/T.I.B.C. ratio as a diagnostic index it has been found that iron deficiency exists in 60% of our expectant mothers with mild anaemia. This type of anaemia was more common in multiparous women and more frequent in the first and second trimesters of pregnancy, There is, therefore, a strong indication for the routine administration of iron supplements to our women during pregnancy and the puerperium. | [
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|
PMID:13013 | Lecithin/sphingomyelin ratio versus rapid surfactant test in normal and diabetic pregnancies. | Lecithin/sphingomyelin (L/S) ratio was measured and rapid surfactant test (RST) was performed on amniotic fluid samples drawn from 60 normal and 18 diabetic pregnancies, for determination of fetal lung maturity. The results were compared to the neonatal outcome. Comparison of L/S ratio and RST demonstrates a good correlation (95%) between the two tests in normal pregnancies. In diabetic pregnancies, however, correlation is notably lower (54%). Respiratory distress syndrome (RDS) was predicted in both L/S ratio and RST in 35-40% of normal pregnancies, with 60-65% of false negative results. In diabetic pregnancies the L/S ratio was as reliable as in normal pregnancies, but the RST was less reliable, with an RDS prediction rate of 18%. The assumption is made that increased amniotic fluid volume in diabetic pregnancies, results in dilution of the surfactant giving more false negative results in RST than are seen with L/S ratio, as in the latter, by measuring the ratio between the two constituents of amniotic fluid, the dilution factor is abolished. In diabetic pregnancies, a positive RST is reliable, but with negative results, L/S ratio must be determined for correct assessment of fetal lung maturity. | Lecithin/sphingomyelin ratio versus rapid surfactant test in normal and diabetic pregnancies. Lecithin/sphingomyelin (L/S) ratio was measured and rapid surfactant test (RST) was performed on amniotic fluid samples drawn from 60 normal and 18 diabetic pregnancies, for determination of fetal lung maturity. The results were compared to the neonatal outcome. Comparison of L/S ratio and RST demonstrates a good correlation (95%) between the two tests in normal pregnancies. In diabetic pregnancies, however, correlation is notably lower (54%). Respiratory distress syndrome (RDS) was predicted in both L/S ratio and RST in 35-40% of normal pregnancies, with 60-65% of false negative results. In diabetic pregnancies the L/S ratio was as reliable as in normal pregnancies, but the RST was less reliable, with an RDS prediction rate of 18%. The assumption is made that increased amniotic fluid volume in diabetic pregnancies, results in dilution of the surfactant giving more false negative results in RST than are seen with L/S ratio, as in the latter, by measuring the ratio between the two constituents of amniotic fluid, the dilution factor is abolished. In diabetic pregnancies, a positive RST is reliable, but with negative results, L/S ratio must be determined for correct assessment of fetal lung maturity. | [
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|
PMID:13014 | Epidural analgesia in midtrimester abortion. | Epidural analgesia was performed in 78 women with abortion in the midtrimester or pre-term delivery of up to 27 weeks of pregnancy. The patients were divided into three groups. The first group included thirty women with signs of inevitable abortion. The second group comprised of 9 cases of induced abortion and the third one of 39 cases of pre-term delivery. The three groups were statistically evaluated in relation to time of abortion or labor, fetal weight, weeks of pregnancy, parity and patient's age and were consequently compared with 90 women divided into three similar control groups. The effect of the epidural analgesia was satisfactory in all cases in the three experimental groups, and no complications or side-effects were observed. The advantages of the use of epidural analgesia were the diminished psychological reaction to the abortion, the possibility to perform surgical procedures without any additional anesthesia and the reduction in the duration of the abortion or labor. These advantages justified in our opinion the use of the procedure. | Epidural analgesia in midtrimester abortion. Epidural analgesia was performed in 78 women with abortion in the midtrimester or pre-term delivery of up to 27 weeks of pregnancy. The patients were divided into three groups. The first group included thirty women with signs of inevitable abortion. The second group comprised of 9 cases of induced abortion and the third one of 39 cases of pre-term delivery. The three groups were statistically evaluated in relation to time of abortion or labor, fetal weight, weeks of pregnancy, parity and patient's age and were consequently compared with 90 women divided into three similar control groups. The effect of the epidural analgesia was satisfactory in all cases in the three experimental groups, and no complications or side-effects were observed. The advantages of the use of epidural analgesia were the diminished psychological reaction to the abortion, the possibility to perform surgical procedures without any additional anesthesia and the reduction in the duration of the abortion or labor. These advantages justified in our opinion the use of the procedure. | [
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|
PMID:13015 | The effect of treatment with a low-dose progestagen (Lynestrenol) on hormonal cytology. | The effect of continuous, low-dose progestagen therapy on endogenous oestrogen production and ovulation in women, was investigated in terms of vaginal cytology. The phase contrast method was used to establish the karyopknotic index from 482 smears from patients using lynestrenol 0.5 mg for oral contraception. The results are presented as the mean of karyopyknotic indices, with standard deviation and standard error of the mean, scored over each three day period of the menstrual cycle, and, in the case of delayed menstruation, over longer periods throughout the protracted cycle. Graphically, the results are shown as average levels compared to controls. Our results show that in patients who have used the preparation for a maximum of three months, cyclic oestrogen production varies only slightly, the mean being within the lower limit of normal and suggesting FSH suppression. In patients who use the preparation for longer periods, the karyopyknotic index becomes similar throughout the cycle to that of controls, being clearly biphasic and generally suggestive of ovulation. In the first group, delayed menstruation seems to be caused mainly by transient FSH suppression. When it occurs in the group treated over a longer period, the disorder appears to be caused by a normo- or hyperoestrogenic, anovulatory condition, due initially to LH suppression with FSH supression setting in later, if the disorder persists longer. | The effect of treatment with a low-dose progestagen (Lynestrenol) on hormonal cytology. The effect of continuous, low-dose progestagen therapy on endogenous oestrogen production and ovulation in women, was investigated in terms of vaginal cytology. The phase contrast method was used to establish the karyopknotic index from 482 smears from patients using lynestrenol 0.5 mg for oral contraception. The results are presented as the mean of karyopyknotic indices, with standard deviation and standard error of the mean, scored over each three day period of the menstrual cycle, and, in the case of delayed menstruation, over longer periods throughout the protracted cycle. Graphically, the results are shown as average levels compared to controls. Our results show that in patients who have used the preparation for a maximum of three months, cyclic oestrogen production varies only slightly, the mean being within the lower limit of normal and suggesting FSH suppression. In patients who use the preparation for longer periods, the karyopyknotic index becomes similar throughout the cycle to that of controls, being clearly biphasic and generally suggestive of ovulation. In the first group, delayed menstruation seems to be caused mainly by transient FSH suppression. When it occurs in the group treated over a longer period, the disorder appears to be caused by a normo- or hyperoestrogenic, anovulatory condition, due initially to LH suppression with FSH supression setting in later, if the disorder persists longer. | [
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|
PMID:13016 | Tubal pregnancy and tubal patency. | The laparoscopic demonstration of a patent tube usually excludes the present of a tubal pregnancy. In the reported case tubal pregnancy was suspected. Tubal patency was tested because of equivocal laparoscopic findings, and an unexpected tubal pregnancy was diagnosed in the presence of tubal patency. | Tubal pregnancy and tubal patency. The laparoscopic demonstration of a patent tube usually excludes the present of a tubal pregnancy. In the reported case tubal pregnancy was suspected. Tubal patency was tested because of equivocal laparoscopic findings, and an unexpected tubal pregnancy was diagnosed in the presence of tubal patency. | [
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|
PMID:13017 | Ritodrine hydrochloride induced cardiopulmonary and placental hemodynamic changes in normal and hypertensive late pregnancy. | Cardiopulmonary parameters (minute volume, heart rate, stroke volume, right heart, pulmonary and left heart blood volumes), blood pressure and placental blood flow were evaluated in 20 normal patients, nine patients with preeclamptic disease and 12 with essential hypertension in late pregnancy before and 60 minutes after a single i.m. dose of 10 mg of ritodrine hydrochloride. The drug caused a statistically significant increase in heart rate in all the patient groups, while the systolic and diastolic blood pressures were only slightly affected. Minute volume was unchanged in the group of normal patients, but in both hypertensive groups there was a significant increase. The placental perfusion index was statistically nearly significantly decreased in the group of uncomplicated pregnancies, statistically significantly increased in preeclamptic patients, and not affected in the group with essential hypertension. Ritodrine hydrochloride medication can be expected to have a positive effect on placental blood flow only in preeclamptic disease, and then probably in the milder forms of the disease. | Ritodrine hydrochloride induced cardiopulmonary and placental hemodynamic changes in normal and hypertensive late pregnancy. Cardiopulmonary parameters (minute volume, heart rate, stroke volume, right heart, pulmonary and left heart blood volumes), blood pressure and placental blood flow were evaluated in 20 normal patients, nine patients with preeclamptic disease and 12 with essential hypertension in late pregnancy before and 60 minutes after a single i.m. dose of 10 mg of ritodrine hydrochloride. The drug caused a statistically significant increase in heart rate in all the patient groups, while the systolic and diastolic blood pressures were only slightly affected. Minute volume was unchanged in the group of normal patients, but in both hypertensive groups there was a significant increase. The placental perfusion index was statistically nearly significantly decreased in the group of uncomplicated pregnancies, statistically significantly increased in preeclamptic patients, and not affected in the group with essential hypertension. Ritodrine hydrochloride medication can be expected to have a positive effect on placental blood flow only in preeclamptic disease, and then probably in the milder forms of the disease. | [
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|
PMID:13018 | Carcinoma-in-situ of the cerivix treated with colposcopy guided epithelial conization. Report of a 4-7 year follow-up study. | Twenty-five patients with the diagnosis of carcinoma-in-situ (CIS) of the cervix were treated with colposcopy guided epithelial conization. During the follow-up study of 4-7 years' duration, there was no recurrence of CIS in 20 of the 25 patients. Between 6 and 12 months after conization, 3 patients showed recurrence of CIS. Two of these patients were treated with further epithelial conization with no evidence of further recurrence 4 years after the second treatment. The third patient refused to accept further epithelial conization and modified radical hysterectomy was done without any evidence of residual tumour in the hysterectomy specimen. One patient showed stromal invasion in both colposcopically guided biopsy and bone biopsy. Modified radical hysterectomy specimen showed remnants of stromal invasion. One patient with Class IV smear failed to show any atypical transformation zone and cervicitis was proven on colposcopy guided biopsy following treatment with Flagyl. For two of the 25 patients, cytology was Class II and therefore failed to diagnose the pre-malignant condition; but colposcopy showed a grade 3 atypical transformation zone and the presence of CIS was confirmed histologically. Simultaneous use of cytology, colposcopy and colposcopically guided biopsy confirmed the diagnosis of CIS in all cases. The authors recommend colposcopically guided epithelial conization in younger patients, provided the malignant lesion is strictly intra-epithelial, and limited to the ectocervix. Routine follow-up with the aid of cyto-colposcopy remains the key factor in this schedule of therapy. | Carcinoma-in-situ of the cerivix treated with colposcopy guided epithelial conization. Report of a 4-7 year follow-up study. Twenty-five patients with the diagnosis of carcinoma-in-situ (CIS) of the cervix were treated with colposcopy guided epithelial conization. During the follow-up study of 4-7 years' duration, there was no recurrence of CIS in 20 of the 25 patients. Between 6 and 12 months after conization, 3 patients showed recurrence of CIS. Two of these patients were treated with further epithelial conization with no evidence of further recurrence 4 years after the second treatment. The third patient refused to accept further epithelial conization and modified radical hysterectomy was done without any evidence of residual tumour in the hysterectomy specimen. One patient showed stromal invasion in both colposcopically guided biopsy and bone biopsy. Modified radical hysterectomy specimen showed remnants of stromal invasion. One patient with Class IV smear failed to show any atypical transformation zone and cervicitis was proven on colposcopy guided biopsy following treatment with Flagyl. For two of the 25 patients, cytology was Class II and therefore failed to diagnose the pre-malignant condition; but colposcopy showed a grade 3 atypical transformation zone and the presence of CIS was confirmed histologically. Simultaneous use of cytology, colposcopy and colposcopically guided biopsy confirmed the diagnosis of CIS in all cases. The authors recommend colposcopically guided epithelial conization in younger patients, provided the malignant lesion is strictly intra-epithelial, and limited to the ectocervix. Routine follow-up with the aid of cyto-colposcopy remains the key factor in this schedule of therapy. | [
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|
PMID:13019 | Detection of tumor-specific antigens in human mucinous cystadenocarcinoma of the ovary by immunodiffusion. | Rabbit antiserum to a tissue extract of human mucinous cystadenocarcinoma of the ovary reacted with tissue extracts of normal ovary and various ovarian malignancies, and ascitic or cystic fluids of ovarian origin by Ouchterlony double gel diffusion and precipitin inhibition techniques. The tumor-associated antigen(s) of mucinous cystadenocarcinoma, which were demonstrated by Ouchterlony double diffusion, were not present in tissue extract of pooled normal ovaries and cystic fluid of benigh tubo-ovarian cyst. An organ-associated tumor antigen as well as the type-specific tumor antigen may exist in mucinous cystadenocarcinoma of the ovary. The mucinous cystadenocarcinoma was not very immunologically different but was distinguishable from serous cystadenocarcinoma and other types of ovarian cancer by double gel diffusion. Precipitin-inhibition reactions demonstated that the adsorbed antiserum to human ovarian mucinous cystadenocarcinoma mixed with tissue extracts of dysgerminoma and serous cystadenocarcinoma, and ascitic fluid of papillary embryonal adenocarcinoma of the ovary could not eliminate the specific precipin line developed with tissue extract of mucinous cystadenocarcinoma. | Detection of tumor-specific antigens in human mucinous cystadenocarcinoma of the ovary by immunodiffusion. Rabbit antiserum to a tissue extract of human mucinous cystadenocarcinoma of the ovary reacted with tissue extracts of normal ovary and various ovarian malignancies, and ascitic or cystic fluids of ovarian origin by Ouchterlony double gel diffusion and precipitin inhibition techniques. The tumor-associated antigen(s) of mucinous cystadenocarcinoma, which were demonstrated by Ouchterlony double diffusion, were not present in tissue extract of pooled normal ovaries and cystic fluid of benigh tubo-ovarian cyst. An organ-associated tumor antigen as well as the type-specific tumor antigen may exist in mucinous cystadenocarcinoma of the ovary. The mucinous cystadenocarcinoma was not very immunologically different but was distinguishable from serous cystadenocarcinoma and other types of ovarian cancer by double gel diffusion. Precipitin-inhibition reactions demonstated that the adsorbed antiserum to human ovarian mucinous cystadenocarcinoma mixed with tissue extracts of dysgerminoma and serous cystadenocarcinoma, and ascitic fluid of papillary embryonal adenocarcinoma of the ovary could not eliminate the specific precipin line developed with tissue extract of mucinous cystadenocarcinoma. | [
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|
PMID:13020 | Fetal heart rate monitoring in cases of decreased fetal movement. | Thirty pregnant women in the third trimester of pregnancy in whom fetal movements were reduced up to cessation, for at least 12 hours, were monitored for FHR. The FHR 12-48 hours after the cessation of fetal movements was pathological in 21 cases and normal in 9 cases. The most frequent pathological FHR changes were loss of beat to beat variation and variable decelerations. In the following 48 hours another four cases showed pathological FHR changes. One to four days before the reduced fetal movements only six out of 15 cases showed pathological FHR changes which were L.B.B.V. Meconium was found in only 50% of the cases. It is suggested that pregnant women, especially high risk cases, should record fetal movements as a screening method. FHR monitoring is also a valuable method for detecting antenatal fetal distress, and should be used as an adjunct to fetal movements recording. When acute fetal distress has been established by MAS alone or with FHR change, the fetus should be promptly delivered. | Fetal heart rate monitoring in cases of decreased fetal movement. Thirty pregnant women in the third trimester of pregnancy in whom fetal movements were reduced up to cessation, for at least 12 hours, were monitored for FHR. The FHR 12-48 hours after the cessation of fetal movements was pathological in 21 cases and normal in 9 cases. The most frequent pathological FHR changes were loss of beat to beat variation and variable decelerations. In the following 48 hours another four cases showed pathological FHR changes. One to four days before the reduced fetal movements only six out of 15 cases showed pathological FHR changes which were L.B.B.V. Meconium was found in only 50% of the cases. It is suggested that pregnant women, especially high risk cases, should record fetal movements as a screening method. FHR monitoring is also a valuable method for detecting antenatal fetal distress, and should be used as an adjunct to fetal movements recording. When acute fetal distress has been established by MAS alone or with FHR change, the fetus should be promptly delivered. | [
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PMID:13025 | Effects of intravenous calcitonin on water, electrolyte, and calcium movement across in vivo rabbit jejunum and ileum. | The influence of intravenously administered synthetic salmon calcitonin on water, electrolyte and calcium fluxes in in vivo rabbit jejunum and ileum was examined. Rabbits were divided into four groups: those receiving (1) saline intravenously while a glucose-free isotonic saline solution perfused the jejunum and ileum; (2) calcitonin intravenously while the same intestinal perfusate was used as in group 1; (3) intravenous saline while 10 mM glucose-isotonic saline solution perfused jejunum and ileum; and (4) intravenous calcitonin while the intestinal perfusate was of the same composition as in group 3. Calcitonin provoked a significant increase in jejunal and ileal water, sodium, and bicarbonate secretion in both the glucose-free and glucose-containing perfusate groups. No influence on calcium movement was noted. These results, similar to findings of Gray et al. (J Clin Invest 52:3084-3088, 1975) in human jejunum, suggest that calcitonin may play a role in the pathogenesis of the watery diarrhea noted in about one-third of patients with medullary carcinoma of the thyroid. In addition, these studies demonstrate the usefulness of the rabbit as an animal model with which to investigate further the effects of calcitonin upon intestinal fluid and electrolyte transport. | Effects of intravenous calcitonin on water, electrolyte, and calcium movement across in vivo rabbit jejunum and ileum. The influence of intravenously administered synthetic salmon calcitonin on water, electrolyte and calcium fluxes in in vivo rabbit jejunum and ileum was examined. Rabbits were divided into four groups: those receiving (1) saline intravenously while a glucose-free isotonic saline solution perfused the jejunum and ileum; (2) calcitonin intravenously while the same intestinal perfusate was used as in group 1; (3) intravenous saline while 10 mM glucose-isotonic saline solution perfused jejunum and ileum; and (4) intravenous calcitonin while the intestinal perfusate was of the same composition as in group 3. Calcitonin provoked a significant increase in jejunal and ileal water, sodium, and bicarbonate secretion in both the glucose-free and glucose-containing perfusate groups. No influence on calcium movement was noted. These results, similar to findings of Gray et al. (J Clin Invest 52:3084-3088, 1975) in human jejunum, suggest that calcitonin may play a role in the pathogenesis of the watery diarrhea noted in about one-third of patients with medullary carcinoma of the thyroid. In addition, these studies demonstrate the usefulness of the rabbit as an animal model with which to investigate further the effects of calcitonin upon intestinal fluid and electrolyte transport. | [
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|
PMID:13027 | Terminal deoxynucleotidyl transferase as a biological marker for human leukemia. | High levels of terminal deoxynucleotidyl transferase have been observed in leukocytes of 7 out of 20 patients with chronic myelogenous leukemia in acute blast phase of the disease. These levels are comparable to the levels observed in human and calf thymus gland and cell lines with some T cell characteristics (Molt 4 and 8402). Negligible levels of this activity were observed in chronic myelogenous leukemia not in an acute blast phase of the disease, chronic lymphocytic leukemia, human B cells, mature T cells, and the mixed population of lymphocytes present in normal human blood. The detection of this enzyme in some patients with chronic myelogenous leukemia in acute blast phase of the disease suggests that the blast proliferation may involve primitive stem cells which have more lymphoid than myelogenous characteristics. This enzyme assay may be of use as a biological marker for following patients during treatment and in remission. | Terminal deoxynucleotidyl transferase as a biological marker for human leukemia. High levels of terminal deoxynucleotidyl transferase have been observed in leukocytes of 7 out of 20 patients with chronic myelogenous leukemia in acute blast phase of the disease. These levels are comparable to the levels observed in human and calf thymus gland and cell lines with some T cell characteristics (Molt 4 and 8402). Negligible levels of this activity were observed in chronic myelogenous leukemia not in an acute blast phase of the disease, chronic lymphocytic leukemia, human B cells, mature T cells, and the mixed population of lymphocytes present in normal human blood. The detection of this enzyme in some patients with chronic myelogenous leukemia in acute blast phase of the disease suggests that the blast proliferation may involve primitive stem cells which have more lymphoid than myelogenous characteristics. This enzyme assay may be of use as a biological marker for following patients during treatment and in remission. | [
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|
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