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PMID:25646 | Chemical and enzymic studies on the characterization of intermediates during the removal of the 14alpha-methyl group in cholesterol biosynthesis. The use of 32-functionalized lanostane derivatives. | By using cell-free preparations of rat liver it was shown that the removal of the 14alpha-methyl group (C-32) of steroids containing either a delta7(8) or a delta8(9) double bond is attended exclusively by the formation of the corresponding 7,14- and 8,14-dienes respectively (structures of types III and VIII). Cumulative evidence from a variety of experimental approaches had led to the deduction that delta8(14)-steroids are not involved as intermediates on the major pathway of cholesterol biosynthesis. The metabolism of [32-3H]lanost-7-ene-3beta,32-diol (structure of type I) results in the formation of radioactive formic acid, no labelled formaldehyde being formed. By using appropriately labelled species of the compound (I) it was found that the release of formic acid and the formation of 4,4-dimethylcholesta-7,14-dien-3beta-ol (strurcture of type III) were closely linked processes, and that in the conversion of compound (I) into compound (III), 3-beta-hydroxylanost-7-en-32-al (II) is an obligatory intermediate. Both the conversion of lanost-7-ene-3beta,32-diol (I) into 3beta-hydroxylanost-7-en-32-al (II) and the further metabolism of the latter (II) to 4,4-dimethylcholesta-7,14-dien-3beta-ol (III) exhibited a requirement for NADPH and O2. This suggests that the oxidation of the 32-hydroxy group of compound (I) to the aldehyde group of compound (II) does not occur by the conventional alcohol dehydrogenase type of reaction, but may proceed by a novel mechanism involving the intermediacy of a gem-diol. A detailed overall pathway for the 14alpha-demethylation in cholesterol biosynthesis is considered, and proposals about the mechanism of individual steps in the pathway are made. | Chemical and enzymic studies on the characterization of intermediates during the removal of the 14alpha-methyl group in cholesterol biosynthesis. The use of 32-functionalized lanostane derivatives. By using cell-free preparations of rat liver it was shown that the removal of the 14alpha-methyl group (C-32) of steroids containing either a delta7(8) or a delta8(9) double bond is attended exclusively by the formation of the corresponding 7,14- and 8,14-dienes respectively (structures of types III and VIII). Cumulative evidence from a variety of experimental approaches had led to the deduction that delta8(14)-steroids are not involved as intermediates on the major pathway of cholesterol biosynthesis. The metabolism of [32-3H]lanost-7-ene-3beta,32-diol (structure of type I) results in the formation of radioactive formic acid, no labelled formaldehyde being formed. By using appropriately labelled species of the compound (I) it was found that the release of formic acid and the formation of 4,4-dimethylcholesta-7,14-dien-3beta-ol (strurcture of type III) were closely linked processes, and that in the conversion of compound (I) into compound (III), 3-beta-hydroxylanost-7-en-32-al (II) is an obligatory intermediate. Both the conversion of lanost-7-ene-3beta,32-diol (I) into 3beta-hydroxylanost-7-en-32-al (II) and the further metabolism of the latter (II) to 4,4-dimethylcholesta-7,14-dien-3beta-ol (III) exhibited a requirement for NADPH and O2. This suggests that the oxidation of the 32-hydroxy group of compound (I) to the aldehyde group of compound (II) does not occur by the conventional alcohol dehydrogenase type of reaction, but may proceed by a novel mechanism involving the intermediacy of a gem-diol. A detailed overall pathway for the 14alpha-demethylation in cholesterol biosynthesis is considered, and proposals about the mechanism of individual steps in the pathway are made. | [
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PMID:25647 | Magnetic coupling of the molybdenum and iron-sulphur centres in xanthine oxidase and xanthine dehydrogenases. | Magnetic interaction between molybdenum and one of the iron-sulphur centres in milk xanthine oxidase [Lowe, Lynden-Bell & Bray (1972) Biochem. J. 130, 239-249] was studied further, with particular reference to the newly discovered Mo(V) e.p.r.(electron-paramagnetic-resonance) signal, Resting II [Lowe, Barber, Pawlik & Bray (1976) Biochem. J. 155, 81-85]. E.p.r. measurements at 35GHz near to 4.2K showed that the interaction has the same sign at all molybdenum orientations and is ferromagnetic. The predicted splitting of the e.p.r. signal from the reduced iron-sulphur centre, Fe/S I, was observed, Providing positive identification of this as the other interacting species. Chemical modification of the molybdenum environment in xanthine oxidase can change the size of the interaction severalfold, but interaction always remains approximately isotropic. The interaction in turkey liver xanthine dehydrogenase is indistinguishable from that in the oxidase. However, a bacterial xanthine dehydrogenase with different iron-sulphur centres shows rather larger interaction. Guanidinium chloride disturbs the iron-sulphur centres of the oxidase, and when this occurs there is a parallel and relatively small change in the interaction. Removal of flavin from the molecule, or raising the pH to 12.0, changes the interaction slightly without affecting the chromophores themselves. It is concluded that the Fe/S I centre and the Mo are at least 1.0nm and probably nearer 2.5nm apart, and that the conformation of the protein between them is relatively stable up to pH 12. | Magnetic coupling of the molybdenum and iron-sulphur centres in xanthine oxidase and xanthine dehydrogenases. Magnetic interaction between molybdenum and one of the iron-sulphur centres in milk xanthine oxidase [Lowe, Lynden-Bell & Bray (1972) Biochem. J. 130, 239-249] was studied further, with particular reference to the newly discovered Mo(V) e.p.r.(electron-paramagnetic-resonance) signal, Resting II [Lowe, Barber, Pawlik & Bray (1976) Biochem. J. 155, 81-85]. E.p.r. measurements at 35GHz near to 4.2K showed that the interaction has the same sign at all molybdenum orientations and is ferromagnetic. The predicted splitting of the e.p.r. signal from the reduced iron-sulphur centre, Fe/S I, was observed, Providing positive identification of this as the other interacting species. Chemical modification of the molybdenum environment in xanthine oxidase can change the size of the interaction severalfold, but interaction always remains approximately isotropic. The interaction in turkey liver xanthine dehydrogenase is indistinguishable from that in the oxidase. However, a bacterial xanthine dehydrogenase with different iron-sulphur centres shows rather larger interaction. Guanidinium chloride disturbs the iron-sulphur centres of the oxidase, and when this occurs there is a parallel and relatively small change in the interaction. Removal of flavin from the molecule, or raising the pH to 12.0, changes the interaction slightly without affecting the chromophores themselves. It is concluded that the Fe/S I centre and the Mo are at least 1.0nm and probably nearer 2.5nm apart, and that the conformation of the protein between them is relatively stable up to pH 12. | [
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PMID:25648 | Pyruvate carboxylase from a thermophilic Bacillus. Studies on the specificity of activation by acyl derivatives of coenzyme A and on the properties of catalysis in the absence of activator. | 1. Oxaloacetate synthesis catalysed by pyruvate carboxylase from a thermophilic Bacillus in the absence of acetyl-CoA required addition of high concentrations of pyruvate, MgATP(2-) and HCO(3) (-), and at 45 degrees C occurred at a maximum rate approx. 20% of that in the presence of a saturating concentration of acetyl-CoA. The apparent K(m) for HCO(3) (-) at pH7.8 was 400mm without acetyl-CoA, and 16mm with a saturating activator concentration. The relationship between reciprocal initial rate and reciprocal MgATP(2-) concentration was non-linear (convex-down) in the absence of acetyl-CoA, but the extent of deviation decreased as the activator concentration was increased. The relationship between reciprocal initial rate and reciprocal pyruvate concentration was non-linear (convex-down) in the presence or absence of acetyl-CoA. 2. The optimum pH for catalysis of oxaloacetate synthesis was similar in the presence or absence of acetyl-CoA. The variation with pH of apparent K(m) for HCO(3) (-) implicated residue(s) with pK(a) 8.6 in catalysis of the activator-independent oxaloacetate synthesis. 3. Linear Arrhenius and van't Hoff plots were observed for the temperature-dependence of oxaloacetate synthesis in the absence of acetyl-CoA over the range 25-55 degrees C. E(a) (activation energy) was 56.3kJ/mol and DeltaH(double dagger) (HCO(3) (-)) (enthalpy of activation) was -38.6kJ/mol. In the presence of acetyl-CoA, biphasic Arrhenius and van't Hoff plots are observed with a change of slope at 30 degrees C in each case. E(a) was 43.7 and 106.3kJ/mol above and below 30 degrees C respectively. 4. Incubation of Bacillus pyruvate carboxylase with trinitrobenzenesulphonate caused specific inactivation of acetyl-CoA-dependent catalytic activity associated with the incorporation of 1.3+/-0.2 trinitrophenyl residues per subunit. Activator-independent catalysis and regulatory inhibition by l-aspartate were unaffected. The rate of inactivation of acetyl-CoA-dependent catalysis by trinitrobenzenesulphonate was specifically decreased by addition of acetyl-CoA and other acetyl-CoA and other acyl-CoA species, but complete protection was not obtained. 5. All alkylacyl derivatives of CoA tested activated Bacillus pyruvate carboxylase; acetyl-CoA was the most effective. The apparent K(a) exhibited a biphasic relationship with acyl-chain length for the straight-chain homologues. Certain long-chain acyl-CoA species showed additional activation at a high concentration. Weak activation occurred on addition of CoA or adenosine 3',5'-bisphosphate, but carboxyacyl-CoA species and derivatives containing a modified phosphoadenosyl group were inhibitory. Thioesters of CoA with non-carboxylic acids, e.g. methanesulphonyl-CoA, serve as activators of the thermophilic Bacillus and Saccharomyces cerevisiae pyruvate carboxylases, but as inhibitors of pyruvate carboxylases obtained from chicken and rat liver. 6. alpha-Oxoglutarate mimics the effect of l-aspartate as a regulatory inhibitor of the pyruvate carboxylases from both the thermophilic Bacillus and Saccharomyces cerevisiae. l-Glutamate was ineffective in both cases. | Pyruvate carboxylase from a thermophilic Bacillus. Studies on the specificity of activation by acyl derivatives of coenzyme A and on the properties of catalysis in the absence of activator. 1. Oxaloacetate synthesis catalysed by pyruvate carboxylase from a thermophilic Bacillus in the absence of acetyl-CoA required addition of high concentrations of pyruvate, MgATP(2-) and HCO(3) (-), and at 45 degrees C occurred at a maximum rate approx. 20% of that in the presence of a saturating concentration of acetyl-CoA. The apparent K(m) for HCO(3) (-) at pH7.8 was 400mm without acetyl-CoA, and 16mm with a saturating activator concentration. The relationship between reciprocal initial rate and reciprocal MgATP(2-) concentration was non-linear (convex-down) in the absence of acetyl-CoA, but the extent of deviation decreased as the activator concentration was increased. The relationship between reciprocal initial rate and reciprocal pyruvate concentration was non-linear (convex-down) in the presence or absence of acetyl-CoA. 2. The optimum pH for catalysis of oxaloacetate synthesis was similar in the presence or absence of acetyl-CoA. The variation with pH of apparent K(m) for HCO(3) (-) implicated residue(s) with pK(a) 8.6 in catalysis of the activator-independent oxaloacetate synthesis. 3. Linear Arrhenius and van't Hoff plots were observed for the temperature-dependence of oxaloacetate synthesis in the absence of acetyl-CoA over the range 25-55 degrees C. E(a) (activation energy) was 56.3kJ/mol and DeltaH(double dagger) (HCO(3) (-)) (enthalpy of activation) was -38.6kJ/mol. In the presence of acetyl-CoA, biphasic Arrhenius and van't Hoff plots are observed with a change of slope at 30 degrees C in each case. E(a) was 43.7 and 106.3kJ/mol above and below 30 degrees C respectively. 4. Incubation of Bacillus pyruvate carboxylase with trinitrobenzenesulphonate caused specific inactivation of acetyl-CoA-dependent catalytic activity associated with the incorporation of 1.3+/-0.2 trinitrophenyl residues per subunit. Activator-independent catalysis and regulatory inhibition by l-aspartate were unaffected. The rate of inactivation of acetyl-CoA-dependent catalysis by trinitrobenzenesulphonate was specifically decreased by addition of acetyl-CoA and other acetyl-CoA and other acyl-CoA species, but complete protection was not obtained. 5. All alkylacyl derivatives of CoA tested activated Bacillus pyruvate carboxylase; acetyl-CoA was the most effective. The apparent K(a) exhibited a biphasic relationship with acyl-chain length for the straight-chain homologues. Certain long-chain acyl-CoA species showed additional activation at a high concentration. Weak activation occurred on addition of CoA or adenosine 3',5'-bisphosphate, but carboxyacyl-CoA species and derivatives containing a modified phosphoadenosyl group were inhibitory. Thioesters of CoA with non-carboxylic acids, e.g. methanesulphonyl-CoA, serve as activators of the thermophilic Bacillus and Saccharomyces cerevisiae pyruvate carboxylases, but as inhibitors of pyruvate carboxylases obtained from chicken and rat liver. 6. alpha-Oxoglutarate mimics the effect of l-aspartate as a regulatory inhibitor of the pyruvate carboxylases from both the thermophilic Bacillus and Saccharomyces cerevisiae. l-Glutamate was ineffective in both cases. | [
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PMID:25649 | The isolation and properties of a non-pepsin proteinase from human gastric mucosa. | 1. A non-pepsin proteinase, proteinase 2, was successfully isolated free from pepsinogen (by repetitive chromatography on DEAE- and CM-celluloses) from the gastric mucosa of a patient with a duodenal ulcer and the uninvaded mucosa of a patient with a gastric adenocarcinoma. 2. Proteinases 1a and 1b, found in gastric adenocarcinoma, were not found in the gastic mucosa of these patients. 3. Proteinase 2 was shown to have an asymmetrical broad pH-activity curve with a maximum over the pH range 3.0-3.7. 4. Proteolytic activity of proteinase 2 was inhibited by pepstatin; the concentration of pepstatin giving 50% inhibition is of the order of 3nm. 5. Inhibition of proteolytic activity by carbenoxolone and related triterpenoids indicated that at pH 4.0 proteinase 2 possesses structural characteristics relating it to the pepsins and at pH 7.4 to the pepsinogens. 6. The sites of cleavage of the B-chain of oxidized insulin for proteinase 2 at pH 1.7 and pH 3.5 were shown to be similar to those previously established for human pepsin 3 and for the cathepsin E of rabbit bone marrow. 7. The non-pepsin proteinase 2 (cathepsin) of human gastric mucosa has properties more similar to cathepsin E than to the cathepsins D. | The isolation and properties of a non-pepsin proteinase from human gastric mucosa. 1. A non-pepsin proteinase, proteinase 2, was successfully isolated free from pepsinogen (by repetitive chromatography on DEAE- and CM-celluloses) from the gastric mucosa of a patient with a duodenal ulcer and the uninvaded mucosa of a patient with a gastric adenocarcinoma. 2. Proteinases 1a and 1b, found in gastric adenocarcinoma, were not found in the gastic mucosa of these patients. 3. Proteinase 2 was shown to have an asymmetrical broad pH-activity curve with a maximum over the pH range 3.0-3.7. 4. Proteolytic activity of proteinase 2 was inhibited by pepstatin; the concentration of pepstatin giving 50% inhibition is of the order of 3nm. 5. Inhibition of proteolytic activity by carbenoxolone and related triterpenoids indicated that at pH 4.0 proteinase 2 possesses structural characteristics relating it to the pepsins and at pH 7.4 to the pepsinogens. 6. The sites of cleavage of the B-chain of oxidized insulin for proteinase 2 at pH 1.7 and pH 3.5 were shown to be similar to those previously established for human pepsin 3 and for the cathepsin E of rabbit bone marrow. 7. The non-pepsin proteinase 2 (cathepsin) of human gastric mucosa has properties more similar to cathepsin E than to the cathepsins D. | [
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PMID:25650 | The biochemical pathway for the breakdown of N4-ethyl-L-asparagine in the bacterium Pseudomonas stutzeri. | N4-Ethyl-L-[u-14C]asparagine and L-[U-14C]aspartate give identical metabolites, mainly intermediates of the tricarboxylic acid cycle and related amino acids, in whole cells of Pseudomonas stutzeri. The labelled asparagine derivative is converted into [14C]-aspartate by cell-free extracts, and this reaction, which has an optimum pH of 8.8 +/- 0.2, is neither inhibited by unlabelled asparagine nor enhanced by unlabelled 2-oxoglutarate. No labelled keto acid corresponding to N4-ethylasparagine was detected in either whole cells or cell-free extracts. Thus N4-ethyl-L-asparagine, like asparagine, must be broken down by hydrolysis, at least in this bacterium. | The biochemical pathway for the breakdown of N4-ethyl-L-asparagine in the bacterium Pseudomonas stutzeri. N4-Ethyl-L-[u-14C]asparagine and L-[U-14C]aspartate give identical metabolites, mainly intermediates of the tricarboxylic acid cycle and related amino acids, in whole cells of Pseudomonas stutzeri. The labelled asparagine derivative is converted into [14C]-aspartate by cell-free extracts, and this reaction, which has an optimum pH of 8.8 +/- 0.2, is neither inhibited by unlabelled asparagine nor enhanced by unlabelled 2-oxoglutarate. No labelled keto acid corresponding to N4-ethylasparagine was detected in either whole cells or cell-free extracts. Thus N4-ethyl-L-asparagine, like asparagine, must be broken down by hydrolysis, at least in this bacterium. | [
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PMID:25651 | The microbial metabolism of Cl compounds. The stoicheiometry of respiration-driven proton translocation in Pseudomonas AM1 and in a mutant lacking cytochrome c. | This paper clarifies the role of cytochrome c in Pseudomonas AM1 by measuring the stoicheiometry of proton translocation driven by respiration of endogenous or added substrates in wild-type bacteria and in a mutant lacking cytochrome c (mutant PCT76). The maximum -->H(+)/O ratio (protons translocated out of the bacteria per atom of oxygen consumed during respiration) was about 4 and, except when respiration was markedly affected, this ratio was similar in mutant and wild-type bacteria. The -->H(+)/O ratios were unaltered when the usual oxidase (cytochrome a(3)) was inhibited by 300mum-KCN and respiration involved the single cytochrome b functioning as an alternative oxidase. Ratios measured in cells respiring endogenous substrate and in cells loaded with malate or 3-hydroxybutyrate suggest that there are two proton-translocating segments operating during the oxidation of NADH. By contrast, during oxidation of formaldehyde or methylamine only one pair of protons is translocated. Proton translocation could not be measured with methanol as substrate, because its oxidation was inhibited (90-95%) by 5mm-KSCN. It is tentatively proposed that the electron-transport chain for NADH oxidation in Pseudomonas AM1 is arranged such that the NADH-ubiquinone oxidoreductase forms one proton-translocating segment and the second segment consists of ubiquinone and cytochromes b and a/a(3). The cytochrome c appears to be essential only for respiration and proton translocation from methanol (and possibly from methylamine); there is no conclusive evidence that cytochrome c ever mediates between cytochromes b and a/a(3) in Pseudomonas AM1. | The microbial metabolism of Cl compounds. The stoicheiometry of respiration-driven proton translocation in Pseudomonas AM1 and in a mutant lacking cytochrome c. This paper clarifies the role of cytochrome c in Pseudomonas AM1 by measuring the stoicheiometry of proton translocation driven by respiration of endogenous or added substrates in wild-type bacteria and in a mutant lacking cytochrome c (mutant PCT76). The maximum -->H(+)/O ratio (protons translocated out of the bacteria per atom of oxygen consumed during respiration) was about 4 and, except when respiration was markedly affected, this ratio was similar in mutant and wild-type bacteria. The -->H(+)/O ratios were unaltered when the usual oxidase (cytochrome a(3)) was inhibited by 300mum-KCN and respiration involved the single cytochrome b functioning as an alternative oxidase. Ratios measured in cells respiring endogenous substrate and in cells loaded with malate or 3-hydroxybutyrate suggest that there are two proton-translocating segments operating during the oxidation of NADH. By contrast, during oxidation of formaldehyde or methylamine only one pair of protons is translocated. Proton translocation could not be measured with methanol as substrate, because its oxidation was inhibited (90-95%) by 5mm-KSCN. It is tentatively proposed that the electron-transport chain for NADH oxidation in Pseudomonas AM1 is arranged such that the NADH-ubiquinone oxidoreductase forms one proton-translocating segment and the second segment consists of ubiquinone and cytochromes b and a/a(3). The cytochrome c appears to be essential only for respiration and proton translocation from methanol (and possibly from methylamine); there is no conclusive evidence that cytochrome c ever mediates between cytochromes b and a/a(3) in Pseudomonas AM1. | [
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PMID:25652 | Regulation of the oxidative phase of the pentose phosphate cycle in mussels. | 1. The mechanisms that control the oxidative phase of the pentose phosphate cycle in mussel hepatopancreas were investigated. 2. The effects of GSSG (oxidized glutathione) on the inhibition of glucose 6-phosphate dehydrogenase by NADPH [Eggleston & Krebs (1974) Biochem. J. 138, 425-435] extend to 6-phosphogluconate dehydrogenase. 3. The effect of GSSG on both enzymes increases as the [NADP+1]/[NADPH] ratio decreases; greater percentage deinhibition always was obtained for 6-phosphogluconate dehydrogenase. 4. Increasing concentration of GSSG increased the percentage deinhibition. This effect is more pronounced with 6-phosphogluconate dehydrogenase. 5. We confirmed the apparent imbalance between the activities of the two enzymes [sapag-Hagar, Lagunas & Sols (1973) Biochem. Biophys. Res. Commun, 50, 179-185] in the presence of 10mM-Mg2+. 6. The imbalance practically disappears when the substrate concentrations are less than saturating and Mg2+ approaches physiological concentrations. 7. The addition of GSSG at physiological concentrations allows the activities of both enzymes to be measured at high [NADPH]/[NADP+] ratios ratios and the co-operative action of GSSG and Mg2+ on the imbalance between the two enzymes to be verified. 8. The control of the activity of the two enzymes of the pentose cycle could be carried out by deinhibition of the two dehydrogenases and by the intracellular concentrations of substrates and inorganic ions. | Regulation of the oxidative phase of the pentose phosphate cycle in mussels. 1. The mechanisms that control the oxidative phase of the pentose phosphate cycle in mussel hepatopancreas were investigated. 2. The effects of GSSG (oxidized glutathione) on the inhibition of glucose 6-phosphate dehydrogenase by NADPH [Eggleston & Krebs (1974) Biochem. J. 138, 425-435] extend to 6-phosphogluconate dehydrogenase. 3. The effect of GSSG on both enzymes increases as the [NADP+1]/[NADPH] ratio decreases; greater percentage deinhibition always was obtained for 6-phosphogluconate dehydrogenase. 4. Increasing concentration of GSSG increased the percentage deinhibition. This effect is more pronounced with 6-phosphogluconate dehydrogenase. 5. We confirmed the apparent imbalance between the activities of the two enzymes [sapag-Hagar, Lagunas & Sols (1973) Biochem. Biophys. Res. Commun, 50, 179-185] in the presence of 10mM-Mg2+. 6. The imbalance practically disappears when the substrate concentrations are less than saturating and Mg2+ approaches physiological concentrations. 7. The addition of GSSG at physiological concentrations allows the activities of both enzymes to be measured at high [NADPH]/[NADP+] ratios ratios and the co-operative action of GSSG and Mg2+ on the imbalance between the two enzymes to be verified. 8. The control of the activity of the two enzymes of the pentose cycle could be carried out by deinhibition of the two dehydrogenases and by the intracellular concentrations of substrates and inorganic ions. | [
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PMID:25653 | Proton translocation of the bovine chromaffin-granule membrane. | Bovine chromaffin granules were lysed and their membranes resealed to give osmotically sensitive 'ghosts'. These swell in the presence of salts and MgATP. It is shown that this is due to proton entry accompanied by anions. The rate of swelling depends on the anion present, but swelling is not limited to media containing permeant anions. It is quite marked in solutions of sulphates, phosphates and acetates. It is not uncoupler-sensitive, suggesting that at least one component of swelling is due to coupled proton and anion entry (non-electrogenic proton translocation). Direct measurements of transmembrane pH and potential gradients generated in the presence of MgATP shows that these are rapidly established in sucrose media, and are rather little affected by the presence of salts. They contribute roughly equally to the total protonmotive force. The potential gradient is establihsed very rapidly, but the pH gradient is generated over several minutes. The gradients are not completely dissipated by uncoupler, and it is shown that, in media containing sulphate but no permeant anion, sulphate can be taken up by the 'ghosts'. There thus appear to be two mechanisms of proton translocation across the membrane, both dependent on ATP hydrolysis: an electrogenic transfer of protons, and proton movement linked to an anion transporter of broad specificity. | Proton translocation of the bovine chromaffin-granule membrane. Bovine chromaffin granules were lysed and their membranes resealed to give osmotically sensitive 'ghosts'. These swell in the presence of salts and MgATP. It is shown that this is due to proton entry accompanied by anions. The rate of swelling depends on the anion present, but swelling is not limited to media containing permeant anions. It is quite marked in solutions of sulphates, phosphates and acetates. It is not uncoupler-sensitive, suggesting that at least one component of swelling is due to coupled proton and anion entry (non-electrogenic proton translocation). Direct measurements of transmembrane pH and potential gradients generated in the presence of MgATP shows that these are rapidly established in sucrose media, and are rather little affected by the presence of salts. They contribute roughly equally to the total protonmotive force. The potential gradient is establihsed very rapidly, but the pH gradient is generated over several minutes. The gradients are not completely dissipated by uncoupler, and it is shown that, in media containing sulphate but no permeant anion, sulphate can be taken up by the 'ghosts'. There thus appear to be two mechanisms of proton translocation across the membrane, both dependent on ATP hydrolysis: an electrogenic transfer of protons, and proton movement linked to an anion transporter of broad specificity. | [
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PMID:25654 | Hydroxytryptamine transport by the bovine chromaffin-granule membrane. | 5-Hydroxytryptamine is accumulated by resealed chromaffin-granule 'ghosts' if a pH gradient (acid inside) is imposed across their membranes by preincubating them at low pH. This uptake, like that driven by MgATP, is reserpine- and uncoupler-sensitive. This strongly suggests that catecholamines are taken up by intact granules in response to a pH gradient. In line with this, it is shown that 5-hydroxytryptamine decreases the pH gradient generated in the presence of MgATP, an effect that is inhibited by reserpine; nigericin, which discharges the pH gradient in the presence of K+, inhibits uptake. Permeant anions, however, also inhibit uptake. It is suggested that this may be because they permit equilibration of amine cations directly across the membrane, down concentration gradients. | Hydroxytryptamine transport by the bovine chromaffin-granule membrane. 5-Hydroxytryptamine is accumulated by resealed chromaffin-granule 'ghosts' if a pH gradient (acid inside) is imposed across their membranes by preincubating them at low pH. This uptake, like that driven by MgATP, is reserpine- and uncoupler-sensitive. This strongly suggests that catecholamines are taken up by intact granules in response to a pH gradient. In line with this, it is shown that 5-hydroxytryptamine decreases the pH gradient generated in the presence of MgATP, an effect that is inhibited by reserpine; nigericin, which discharges the pH gradient in the presence of K+, inhibits uptake. Permeant anions, however, also inhibit uptake. It is suggested that this may be because they permit equilibration of amine cations directly across the membrane, down concentration gradients. | [
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PMID:25655 | Contribution of cytochromes and proteins to the effect of ascorbic acid on artificial and microsomal hydroxylation systems containing oxygen and hydrogen peroxide. | Hydroxylation systems containing cytochromes, proteins and ascorbic acid were studied at physiological pH (7.4) under O2 or N2 with added H2O2. Proteins inhibited aromatic hydroxylation of p-nitrophenol or oxidative demethylation of ethylmorphine in ascorbic acid-containing systems incubated under O2, but strongly activated the systems containing H2O2. Cytochrome c and partially purified cytochrome P-450 from rat liver microsomal preparations activated the system in either O2 or H2O2. The systems needed ascorbic acid (or other enol structures) for activation. Cytochrome iron participated probably in the activation of O2, whereas cytochrome protein participated in a free radical activation of H2O2 (or of O2). | Contribution of cytochromes and proteins to the effect of ascorbic acid on artificial and microsomal hydroxylation systems containing oxygen and hydrogen peroxide. Hydroxylation systems containing cytochromes, proteins and ascorbic acid were studied at physiological pH (7.4) under O2 or N2 with added H2O2. Proteins inhibited aromatic hydroxylation of p-nitrophenol or oxidative demethylation of ethylmorphine in ascorbic acid-containing systems incubated under O2, but strongly activated the systems containing H2O2. Cytochrome c and partially purified cytochrome P-450 from rat liver microsomal preparations activated the system in either O2 or H2O2. The systems needed ascorbic acid (or other enol structures) for activation. Cytochrome iron participated probably in the activation of O2, whereas cytochrome protein participated in a free radical activation of H2O2 (or of O2). | [
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PMID:25656 | Evidence for a pH-dependent irreversible formation of a stable conformation of phenacyl-alpha-chymotrypsin. | A reinvestigation of the modification reactions of alpha-chymotrypsin with phenacyl bromide was carried out. Results conclusively demonstrate that the chemically and physically different modified enzymes prepared at pH 4 and at pH 7 both contain the phenacyl group at methionine-192 in the sulphonium salt form. Evidence to suppoort this conclusion derives from 13C nuclear-magnetic-resonance spectroscopic observations on [methylene-13C]phenacyl-enriched enzymes. More conclusively, the methionine-192-containing C-chain, derived by performic acid oxidative cleavage of radioactively-labelled enzyme prepared at pH 7, was shown to contain the phenacyl moiety and to undergo dealkylation by 2-mercaptoethanol with loss of this moiety. In addition, thermolytic cleavage of the high-pH enzyme results in fragmentation of the polypeptide chain in a fashion analogous to model reactions of phenacylmethionyl dipeptides and other methionine-192 sulphonium salts. A rationalization of the unusual nature of the high-pH phenacyl-modified enzyme based on the irreversible formation of stable conformation in which the phenacyl moiety is rigidly located in interior regions of the enzyme is presented and discussed. | Evidence for a pH-dependent irreversible formation of a stable conformation of phenacyl-alpha-chymotrypsin. A reinvestigation of the modification reactions of alpha-chymotrypsin with phenacyl bromide was carried out. Results conclusively demonstrate that the chemically and physically different modified enzymes prepared at pH 4 and at pH 7 both contain the phenacyl group at methionine-192 in the sulphonium salt form. Evidence to suppoort this conclusion derives from 13C nuclear-magnetic-resonance spectroscopic observations on [methylene-13C]phenacyl-enriched enzymes. More conclusively, the methionine-192-containing C-chain, derived by performic acid oxidative cleavage of radioactively-labelled enzyme prepared at pH 7, was shown to contain the phenacyl moiety and to undergo dealkylation by 2-mercaptoethanol with loss of this moiety. In addition, thermolytic cleavage of the high-pH enzyme results in fragmentation of the polypeptide chain in a fashion analogous to model reactions of phenacylmethionyl dipeptides and other methionine-192 sulphonium salts. A rationalization of the unusual nature of the high-pH phenacyl-modified enzyme based on the irreversible formation of stable conformation in which the phenacyl moiety is rigidly located in interior regions of the enzyme is presented and discussed. | [
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PMID:25657 | Pressure relaxation of the equilibrium of the pig heart lactate dehydrogenase system. | The relaxation behaviour of a system of reactants equilibrated in the presence of pig heart lactate dehydrogenase was studied after pressure perturbation. Two relaxations were observed when protein fluorescence was recorded, but only the slower relaxation was apparent in observations of A340. The faster relaxation therefore involves transfer between free and enzyme-bound NADH, whereas the slower relaxation represents the reduction of NAD+. Both relaxations were observed in Tris buffer, where there is little effect of pressure on pH, and in phosphate buffer, where pH changes are significant; however, the amplitudes depended on the buffer used. The slower reciprocal relaxation time increases with increasing total enzyme concentration and decreases slightly with increasing NAD+ concentration. Computer simulations, based on a proposed mechanism, were compared with the experimentally determined amplitudes and relaxation times as a test of the mechanism. | Pressure relaxation of the equilibrium of the pig heart lactate dehydrogenase system. The relaxation behaviour of a system of reactants equilibrated in the presence of pig heart lactate dehydrogenase was studied after pressure perturbation. Two relaxations were observed when protein fluorescence was recorded, but only the slower relaxation was apparent in observations of A340. The faster relaxation therefore involves transfer between free and enzyme-bound NADH, whereas the slower relaxation represents the reduction of NAD+. Both relaxations were observed in Tris buffer, where there is little effect of pressure on pH, and in phosphate buffer, where pH changes are significant; however, the amplitudes depended on the buffer used. The slower reciprocal relaxation time increases with increasing total enzyme concentration and decreases slightly with increasing NAD+ concentration. Computer simulations, based on a proposed mechanism, were compared with the experimentally determined amplitudes and relaxation times as a test of the mechanism. | [
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PMID:25658 | Pyruvate-to-ethanol pathway in Entamoeba histolytica. | The pyruvate-to-ethanol pathway in Entamoeba histolytica is unusual when compared with most investigated organisms. Pyruvate decarboxylase (EC 4.1.1.1), a key enzyme for ethanol production, is not found. Pyruvate is converted into acetyl-CoA and CO2 by the enzyme pyruvate synthase (EC 1.2.7.1), which has been demonstrated previously in this parasitic amoeba. Acetyl-CoA is reduced to acetaldehyde and CoA by the enzyme aldehyde dehydrogenase (acylating) (EC 1.2.1.10) at an enzyme activity of 9 units per g of fresh cells with NADH as a reductant. Acetaldehyde is further reduced by either a previously identified NADP+-linked alcohol dehydrogenase or by a newly found NAD+-linked alcohol dehydrogenase at an enzyme activity of 136 units per g of fresh cells. Ethanol is identified as the product of soluble enzymes of amoeba acting on pyruvate or acetyl-CoA. This result is confirmed by radioactive isotopic, spectrophotometric and gas-chromatographic methods. | Pyruvate-to-ethanol pathway in Entamoeba histolytica. The pyruvate-to-ethanol pathway in Entamoeba histolytica is unusual when compared with most investigated organisms. Pyruvate decarboxylase (EC 4.1.1.1), a key enzyme for ethanol production, is not found. Pyruvate is converted into acetyl-CoA and CO2 by the enzyme pyruvate synthase (EC 1.2.7.1), which has been demonstrated previously in this parasitic amoeba. Acetyl-CoA is reduced to acetaldehyde and CoA by the enzyme aldehyde dehydrogenase (acylating) (EC 1.2.1.10) at an enzyme activity of 9 units per g of fresh cells with NADH as a reductant. Acetaldehyde is further reduced by either a previously identified NADP+-linked alcohol dehydrogenase or by a newly found NAD+-linked alcohol dehydrogenase at an enzyme activity of 136 units per g of fresh cells. Ethanol is identified as the product of soluble enzymes of amoeba acting on pyruvate or acetyl-CoA. This result is confirmed by radioactive isotopic, spectrophotometric and gas-chromatographic methods. | [
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PMID:25659 | DNA polymerases from Chlamydomonas reinhardii. Purification and properties. | Three DNA polymerase activities, A, B and C, were identified in extracts of exponentially growing synchronous cultures of Chlamydomonas reinhardii, and DNA polymerases A and B were characterized in detail. Both enzymes have the same binding affinity for DEAE-cellulose at pH 7.8, but can be distinguished from each other by their behaviour on phosphocellulose and DNA-agarose. 'Activated' calf thymus DNA was used as template, and the pH, K+ and bivalent-cation optima were measured. DNA polymerase A sediments at 5.3 S in glycerol gradients, with an apparent mol.wt. of 90000-100000. Polymerase B sediments between 8S and 10S in 100mM-KCl, the predominant species having an apparent mol.wt. of 200000. In 200mM-KCl, polymerase B dissociates to a single species, which sediments at 5.8S. A 3S species was found in aged preparations of both enzymes. The activity of polymerase B from cells harvested during nuclear DNA synthesis is twice that found in Chlamydomonas at other times during the cell cycle. | DNA polymerases from Chlamydomonas reinhardii. Purification and properties. Three DNA polymerase activities, A, B and C, were identified in extracts of exponentially growing synchronous cultures of Chlamydomonas reinhardii, and DNA polymerases A and B were characterized in detail. Both enzymes have the same binding affinity for DEAE-cellulose at pH 7.8, but can be distinguished from each other by their behaviour on phosphocellulose and DNA-agarose. 'Activated' calf thymus DNA was used as template, and the pH, K+ and bivalent-cation optima were measured. DNA polymerase A sediments at 5.3 S in glycerol gradients, with an apparent mol.wt. of 90000-100000. Polymerase B sediments between 8S and 10S in 100mM-KCl, the predominant species having an apparent mol.wt. of 200000. In 200mM-KCl, polymerase B dissociates to a single species, which sediments at 5.8S. A 3S species was found in aged preparations of both enzymes. The activity of polymerase B from cells harvested during nuclear DNA synthesis is twice that found in Chlamydomonas at other times during the cell cycle. | [
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PMID:25660 | The purification and properties of urocanase from Pseudomonas testosteroni. | Urocanase (urocanate hydratase, EC 4.2.1.49) purified from Pseudomonas testosteroni has a mol.wt. of 118000 determined by sedimentation-equilibrium analysis. Ultracentrifugation in 6M-guanidine hydrochloride and polyacrylamide-gel electrophoresis in sodium dodecyl sulphate show that the enzyme consists of two identical or very similar subunits. It is, like urocanase isolated from other sources, inhibited by reagents that react with carbonyl groups. Although urocanase from Ps. testosteroni is strongly inhibited by NaBH4, no evidence could be obtained for the presence of covalently bound 2-oxobutyrate as a prosthetic group; this is in contrast with findings elsewhere for urocanase from Pseudomonas putida. Urocanase from Ps. testosteroni does not contain pyridoxal 5'-phosphate as a coenzyme and in this respect is similar to all urocanases studied in purified form. | The purification and properties of urocanase from Pseudomonas testosteroni. Urocanase (urocanate hydratase, EC 4.2.1.49) purified from Pseudomonas testosteroni has a mol.wt. of 118000 determined by sedimentation-equilibrium analysis. Ultracentrifugation in 6M-guanidine hydrochloride and polyacrylamide-gel electrophoresis in sodium dodecyl sulphate show that the enzyme consists of two identical or very similar subunits. It is, like urocanase isolated from other sources, inhibited by reagents that react with carbonyl groups. Although urocanase from Ps. testosteroni is strongly inhibited by NaBH4, no evidence could be obtained for the presence of covalently bound 2-oxobutyrate as a prosthetic group; this is in contrast with findings elsewhere for urocanase from Pseudomonas putida. Urocanase from Ps. testosteroni does not contain pyridoxal 5'-phosphate as a coenzyme and in this respect is similar to all urocanases studied in purified form. | [
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PMID:25661 | A reappraisal of the reaction of butyryl-coenzyme A dehydrogenase with phenylmercuric acetate. Evidence that de-greening involves a reaction of the tightly bound thioester. | Phenylmercuric acetate reversibly de-greens butyryl-CoA dehydrogenase from Megasphaera elsdenii, abolishing the absorption band at 710nm. The view that this is a result of modification of a protein thiol group is re-examined in the light of the following new observations. (i) After treatment with phenylmercuric acetate, the enzyme's ability to be re-greened by addition of thiols was not decreased by gel filtration or precipitation with (NH(4))(2)SO(4). (ii) Phenylmercuric acetate caused the same extent of de-greening whether added in a few large amounts or many small ones. The overall time taken for de-greening was, however, greatly extended when many small additions were made. (iii) In Tris/acetate buffer, pH7.5, 3.5mol of phenylmercuric acetate/mol of enzyme subunit was required for complete de-greening, compared with only 2.5mol/mol in phosphate buffer, pH7. (iv) None of the groups that react with phenylmercuric acetate is accessible to iodoacetate or iodoacetamide. (v) On a molar basis dithiothreitol, mercaptoethanol and CoA are equally effective in re-greening the enzyme. (vi) Provided that phenylmercuric acetate is not present in excess, the de-greened enzyme forms normal and stable complexes with crotonyl-CoA and acetoacetyl-CoA. (vii) When a small excess of phenylmercuric acetate is present, full stable development of the enzyme-acetoacetyl-CoA complex requires addition of several mol of acetoacetyl-CoA/mol of enzyme subunit. (viii) The ability of de-greened enzyme to be immediately re-greened by an excess of thiol declines with time, more rapidly at pH6 than at pH7 or 8, but at all three pH values the instantaneous re-greening was followed by a slow phase of further increase in A(710). This further recovery was most extensive and most rapid at pH8. These findings are reminiscent of the previously described reversible decline in the re-greening capacity of a protein-free acid extract of green butyryl-CoA dehydrogenase. It is concluded that the likely cause of de-greening is chemical modification of the tightly bound thioester rather than a protein thiol group. The reversibility would be explained if the thioester exists on the surface of the enzyme in equilibrium with free CoA and a lactone, or if the acyl group is readily and reversibly transferred from the thiol of CoA to a protein side chain. | A reappraisal of the reaction of butyryl-coenzyme A dehydrogenase with phenylmercuric acetate. Evidence that de-greening involves a reaction of the tightly bound thioester. Phenylmercuric acetate reversibly de-greens butyryl-CoA dehydrogenase from Megasphaera elsdenii, abolishing the absorption band at 710nm. The view that this is a result of modification of a protein thiol group is re-examined in the light of the following new observations. (i) After treatment with phenylmercuric acetate, the enzyme's ability to be re-greened by addition of thiols was not decreased by gel filtration or precipitation with (NH(4))(2)SO(4). (ii) Phenylmercuric acetate caused the same extent of de-greening whether added in a few large amounts or many small ones. The overall time taken for de-greening was, however, greatly extended when many small additions were made. (iii) In Tris/acetate buffer, pH7.5, 3.5mol of phenylmercuric acetate/mol of enzyme subunit was required for complete de-greening, compared with only 2.5mol/mol in phosphate buffer, pH7. (iv) None of the groups that react with phenylmercuric acetate is accessible to iodoacetate or iodoacetamide. (v) On a molar basis dithiothreitol, mercaptoethanol and CoA are equally effective in re-greening the enzyme. (vi) Provided that phenylmercuric acetate is not present in excess, the de-greened enzyme forms normal and stable complexes with crotonyl-CoA and acetoacetyl-CoA. (vii) When a small excess of phenylmercuric acetate is present, full stable development of the enzyme-acetoacetyl-CoA complex requires addition of several mol of acetoacetyl-CoA/mol of enzyme subunit. (viii) The ability of de-greened enzyme to be immediately re-greened by an excess of thiol declines with time, more rapidly at pH6 than at pH7 or 8, but at all three pH values the instantaneous re-greening was followed by a slow phase of further increase in A(710). This further recovery was most extensive and most rapid at pH8. These findings are reminiscent of the previously described reversible decline in the re-greening capacity of a protein-free acid extract of green butyryl-CoA dehydrogenase. It is concluded that the likely cause of de-greening is chemical modification of the tightly bound thioester rather than a protein thiol group. The reversibility would be explained if the thioester exists on the surface of the enzyme in equilibrium with free CoA and a lactone, or if the acyl group is readily and reversibly transferred from the thiol of CoA to a protein side chain. | [
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PMID:25662 | A study of the enhanced toxicity of doxapram in rodents treated with narcotic analgesics. | It has been shown in both mice and rats that the LD50 value for doxapram is reduced in rodents treated with narcotic analgesics. In both species the site of the toxic interaction appears to be the cardiovascular system. Doxapram alone, in sub-lethal doses, appears to cause conduction defects in the heart and this action of doxapram is increased in rodents treated with morphine. The enhancement of the toxicity of doxapram by morphine appears to involve an action in the central nervous system probably not related to respiratory depression. | A study of the enhanced toxicity of doxapram in rodents treated with narcotic analgesics. It has been shown in both mice and rats that the LD50 value for doxapram is reduced in rodents treated with narcotic analgesics. In both species the site of the toxic interaction appears to be the cardiovascular system. Doxapram alone, in sub-lethal doses, appears to cause conduction defects in the heart and this action of doxapram is increased in rodents treated with morphine. The enhancement of the toxicity of doxapram by morphine appears to involve an action in the central nervous system probably not related to respiratory depression. | [
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PMID:25663 | Lorazepam, hyoscine and atropine as i.v. surgical premedicants. | Lorazepam 2 and 4 mg alone and in combination with atropine 0.4 mg and hyoscine 0.4 mg were studied as i.v. surgical premedicants in 150 patients. Relief of anxiety, sedation, patient acceptance, lack of recall and side-effects were evaluated. Hyoscine was found to improve the relief of anxiety and sedation associated with lorazepam, but did not significantly increase lack of recall or patient acceptance. The addition of atropine to lorazepam did not significantly alter its effects. A high frequency of agitation and restlessness in patients receiving lorazepam and hyoscine make this combination undesirable for surgical premedication. | Lorazepam, hyoscine and atropine as i.v. surgical premedicants. Lorazepam 2 and 4 mg alone and in combination with atropine 0.4 mg and hyoscine 0.4 mg were studied as i.v. surgical premedicants in 150 patients. Relief of anxiety, sedation, patient acceptance, lack of recall and side-effects were evaluated. Hyoscine was found to improve the relief of anxiety and sedation associated with lorazepam, but did not significantly increase lack of recall or patient acceptance. The addition of atropine to lorazepam did not significantly alter its effects. A high frequency of agitation and restlessness in patients receiving lorazepam and hyoscine make this combination undesirable for surgical premedication. | [
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PMID:25664 | Exacerbations of chronic bronchitis: exogenous or endogenous infection? | Six male patients with chronic bronchitis, who were known previously to have excreted Streptococcus pneumoniae and/or Haemophilus influenzae, both at the times of exacerbations and during remission, were studied for 43 to 52 months. Sputum was examined fortnightly and at the time of exacerbations. Strains of Strep. pneumoniae were serotyped and those of Haemophilus species were typed by antibiograms along with other supporting methods. Sera collected before or at the time of an exacerbation and seven and 30 days afterwards were examined by complement fixation tests against respiratory viruses and Mycoplasma pneumoniae. In 18 out of 25 exacerbations there was evidence of a new type of Strep. pneumoniae and/or Haemophilus spp. or of a current virus infection, suggesting exogenous infection in the majority of these cases. There was a possible reason for failure to detect a new pathogen in three of the seven cases in which none was found. In five further exacerbations adequate investigation was not possible. | Exacerbations of chronic bronchitis: exogenous or endogenous infection? Six male patients with chronic bronchitis, who were known previously to have excreted Streptococcus pneumoniae and/or Haemophilus influenzae, both at the times of exacerbations and during remission, were studied for 43 to 52 months. Sputum was examined fortnightly and at the time of exacerbations. Strains of Strep. pneumoniae were serotyped and those of Haemophilus species were typed by antibiograms along with other supporting methods. Sera collected before or at the time of an exacerbation and seven and 30 days afterwards were examined by complement fixation tests against respiratory viruses and Mycoplasma pneumoniae. In 18 out of 25 exacerbations there was evidence of a new type of Strep. pneumoniae and/or Haemophilus spp. or of a current virus infection, suggesting exogenous infection in the majority of these cases. There was a possible reason for failure to detect a new pathogen in three of the seven cases in which none was found. In five further exacerbations adequate investigation was not possible. | [
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PMID:25665 | Cell membrane enzymes: L-gamma-glutamyl transpeptidase, leucine aminopeptidase, maltase and trehalase in normal and leukaemic lymphocytes. | Several cell-membrane enzymes, which serve functions in amino acid and sugar transport, were measured in peripheral blood lymphocytes from chronic B and T lymphocytic disorders, blast cells in acute leukaemias, and in normal lymphocytes from cord blood, peripheral blood of adults, tonsils and bone-marrow plasma cells in myelomatosis. The specific activities of L-gamma-glutamyl transpeptidase, maltase and trehalase were low, as compared with those measured in normal blood lymphocytes, in the acute leukaemias and in the chronic B-cell disorders. In myelomatosis and in the chronic T-cell disorders, the specific activity of these three enzymes was in the normal range or above normal. The specific activity of leucine aminopeptidase was low in all the chronic B-cell disorders and in some of the lymphoblastic leukaemias. It was elevated in Sézary syndrome cells but low in T-chronic lymphocytic leukaemia. All four enzymes were lower than normal in cord blood lymphocytes and higher than normal in tonsils. These findings are discussed in relation to the patterns of lymphoid cell differentiation and maturation in normal tissues and in leukaemic states. | Cell membrane enzymes: L-gamma-glutamyl transpeptidase, leucine aminopeptidase, maltase and trehalase in normal and leukaemic lymphocytes. Several cell-membrane enzymes, which serve functions in amino acid and sugar transport, were measured in peripheral blood lymphocytes from chronic B and T lymphocytic disorders, blast cells in acute leukaemias, and in normal lymphocytes from cord blood, peripheral blood of adults, tonsils and bone-marrow plasma cells in myelomatosis. The specific activities of L-gamma-glutamyl transpeptidase, maltase and trehalase were low, as compared with those measured in normal blood lymphocytes, in the acute leukaemias and in the chronic B-cell disorders. In myelomatosis and in the chronic T-cell disorders, the specific activity of these three enzymes was in the normal range or above normal. The specific activity of leucine aminopeptidase was low in all the chronic B-cell disorders and in some of the lymphoblastic leukaemias. It was elevated in Sézary syndrome cells but low in T-chronic lymphocytic leukaemia. All four enzymes were lower than normal in cord blood lymphocytes and higher than normal in tonsils. These findings are discussed in relation to the patterns of lymphoid cell differentiation and maturation in normal tissues and in leukaemic states. | [
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PMID:25666 | Characterization of marrow granulocyte development: enzyme-specific activity profiles in response to inflammatory reactions. | Isopycnic sedimentation has been used to separate granulocytes of varying stages of maturity from the bone marrows of normal rabbits and rabbits stimulated to undergo an intense inflammatory response. The separated cell populations were in turn utilized to study the specific activities of six intracellular enzymes. The study revealed an increase with cell maturation in the specific activities of myeloperoxidase, NADPH oxidase, alkaline phosphatase and acid phosphatase in normal animals; in stimulated animals only myeloperoxidase and NADPH oxidase increased significantly with cell maturation. Glucose-6-phosphate dehydrogenase showed no change in specific activity in all animals studied. Malate dehydrogenase tended to show a specific activity decrease in the maturing cells of normal but not in those of stimulated animals. | Characterization of marrow granulocyte development: enzyme-specific activity profiles in response to inflammatory reactions. Isopycnic sedimentation has been used to separate granulocytes of varying stages of maturity from the bone marrows of normal rabbits and rabbits stimulated to undergo an intense inflammatory response. The separated cell populations were in turn utilized to study the specific activities of six intracellular enzymes. The study revealed an increase with cell maturation in the specific activities of myeloperoxidase, NADPH oxidase, alkaline phosphatase and acid phosphatase in normal animals; in stimulated animals only myeloperoxidase and NADPH oxidase increased significantly with cell maturation. Glucose-6-phosphate dehydrogenase showed no change in specific activity in all animals studied. Malate dehydrogenase tended to show a specific activity decrease in the maturing cells of normal but not in those of stimulated animals. | [
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PMID:25668 | Fluorescence-quenching study of glucose binding by yeast hexokinase isoenzymes. | A study of the effect of varying ionic strength on the glucose-induced quenching of tryptophan fluorescence of hexokinase isoenzymes A(P-I) and B(P-II) was carried out at pH 8.3 and pH 5.5. At p/ 8.3 both isoenzymes gave apparently linear Scatchard-type data plots even with protein concentrations and ionic strengths for which both dimeric and monomeric forms of hexokinase coexist in signiciant amounts. Taking inco account a 1% accuracy in the experimental measurements, we concluded that the intrinsic dissociation constants K(M) and K(D), for the binding of glucose to the monomeric and dimeric forms of HkB, are within a factor of two of each other, i.e. K(D)/K(M) less than or equal to 2. The values of K(M), estimated from the apparent K, were so greatly influenced by ionic strength that it is clear that it is meaningless to compare K(M) and K(D) values measured at different ionic strengths as has been done in the literature. Curvature in the pH 5.5. fluorescence-quenching plots for relatively low ionic strengths demonstrates cooperativity for glucose-binding to the dimer, positive for HkA but negative for HkB. In contrast, the binding is relatively non-cooperative at high ionic strength at this pH. These results were attributed to the well known effect of salt-neutralization of side chain electrical charges on the flexibility and compactness of proteins. | Fluorescence-quenching study of glucose binding by yeast hexokinase isoenzymes. A study of the effect of varying ionic strength on the glucose-induced quenching of tryptophan fluorescence of hexokinase isoenzymes A(P-I) and B(P-II) was carried out at pH 8.3 and pH 5.5. At p/ 8.3 both isoenzymes gave apparently linear Scatchard-type data plots even with protein concentrations and ionic strengths for which both dimeric and monomeric forms of hexokinase coexist in signiciant amounts. Taking inco account a 1% accuracy in the experimental measurements, we concluded that the intrinsic dissociation constants K(M) and K(D), for the binding of glucose to the monomeric and dimeric forms of HkB, are within a factor of two of each other, i.e. K(D)/K(M) less than or equal to 2. The values of K(M), estimated from the apparent K, were so greatly influenced by ionic strength that it is clear that it is meaningless to compare K(M) and K(D) values measured at different ionic strengths as has been done in the literature. Curvature in the pH 5.5. fluorescence-quenching plots for relatively low ionic strengths demonstrates cooperativity for glucose-binding to the dimer, positive for HkA but negative for HkB. In contrast, the binding is relatively non-cooperative at high ionic strength at this pH. These results were attributed to the well known effect of salt-neutralization of side chain electrical charges on the flexibility and compactness of proteins. | [
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PMID:25670 | Use of salicylic acid to measure the apparent intracellular pH in the Ehrlich ascites-tumor cell and Escherichia coli. | The distribution of salicylic acid between the intracellular and extracellular phases has been used to estimate the intracellular pH in the Ehrlich cell and Escherichia coli. The validity of the method was established by: (i) comparison of the results obtained with salicylic acid with those obtained with 5,5-dimethyloxazolidine-2,4-dione; (ii) by following changes of the apparent intracellular pH under circumstances in which such changes are predictable, e.g., the addition of weak acids or proton conductors to the incubation medium during incubation at acidic pH; (iii) by comparison of the apparent intracellular pH changes with the uptake of H+ by the cells estimated from the changes of the medium pH. Optimal results are obtained with this indicator when the extracellular pH is below 5.5, because in this case the indicator is to a sufficient extent in its penetrating form, so that its movement can reflect intracellular pH changes occurring in less than 30 s. When the intracellular pH falls below 5.2 measurable binding of salicylic acid to the intracellular material of the Ehrlich cell takes place, but above this pH no binding has been found. The Ehrlich cell and cells of Escherichia coli behaved similarly under various experimental circumstances tested, but striking difference were found in the inherent permeability of the membrane to H+ and in the changes in this parameter by lowering the temperature to 2 degrees C. | Use of salicylic acid to measure the apparent intracellular pH in the Ehrlich ascites-tumor cell and Escherichia coli. The distribution of salicylic acid between the intracellular and extracellular phases has been used to estimate the intracellular pH in the Ehrlich cell and Escherichia coli. The validity of the method was established by: (i) comparison of the results obtained with salicylic acid with those obtained with 5,5-dimethyloxazolidine-2,4-dione; (ii) by following changes of the apparent intracellular pH under circumstances in which such changes are predictable, e.g., the addition of weak acids or proton conductors to the incubation medium during incubation at acidic pH; (iii) by comparison of the apparent intracellular pH changes with the uptake of H+ by the cells estimated from the changes of the medium pH. Optimal results are obtained with this indicator when the extracellular pH is below 5.5, because in this case the indicator is to a sufficient extent in its penetrating form, so that its movement can reflect intracellular pH changes occurring in less than 30 s. When the intracellular pH falls below 5.2 measurable binding of salicylic acid to the intracellular material of the Ehrlich cell takes place, but above this pH no binding has been found. The Ehrlich cell and cells of Escherichia coli behaved similarly under various experimental circumstances tested, but striking difference were found in the inherent permeability of the membrane to H+ and in the changes in this parameter by lowering the temperature to 2 degrees C. | [
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PMID:25674 | Complexes of cobalt (II) and manganese (II) with adenosine 5'-diphosphate and adenosine 5'-triphosphate. A circular dichroism study. | For studies of interactions between Co2+ and adenosine 5'-diphosphate or adenosine 5'-triphosphate (ADPH4+ and ATPH5+ in strongly acidic medium) visible circular dichroism (d-d transitions of Co2+) and ultraviolet circular dichroism (adenine transitions) have proven to be very sensitive to structural changes. Drastic variation of spectra as a function of pH and concentration enabled us to show the existence of various species, to state their stoichiometry and eventually, their self-association. With ATPH22-, C.D. results are in agreement with recent N.M.R. results. With ligands bearing three negative charges, complexes (1 metal:2 nucleotides)n are formed in which bases of the two nucleotides of the molecule are self-associated. With ADP3-, the visible C.D. spectrum of this complex is intense and hides the spectra of the complexes formed with other protonated species of ADP; this self-associated complex is detected up to a lower limit of 5 X 10(-4) M concentration. With ATPH3-, a complex exhibiting the same characteristics as the one with ADP3- is formed but in about twenty times less amount which explains why it was not detected by potentiometry. With 0.1 M ATP4-, dimeric (or polymeric) complexes, of 1:2 and 1:1 stoichiometry are observed. With 0.01 M ATP4-, 1:1 monomeric and 2:1 dimeric (or polymeric) complexes are detected. The interactions between Mn2+ ions and ADP or ATP have been studied by C.D. on the UV range. The same species as with Co2+ ions have been found but the 1:2 complex formation with ADP3- was shown to occur to a lesser extent and was not observed below a 10(-2) M ADP concentration. | Complexes of cobalt (II) and manganese (II) with adenosine 5'-diphosphate and adenosine 5'-triphosphate. A circular dichroism study. For studies of interactions between Co2+ and adenosine 5'-diphosphate or adenosine 5'-triphosphate (ADPH4+ and ATPH5+ in strongly acidic medium) visible circular dichroism (d-d transitions of Co2+) and ultraviolet circular dichroism (adenine transitions) have proven to be very sensitive to structural changes. Drastic variation of spectra as a function of pH and concentration enabled us to show the existence of various species, to state their stoichiometry and eventually, their self-association. With ATPH22-, C.D. results are in agreement with recent N.M.R. results. With ligands bearing three negative charges, complexes (1 metal:2 nucleotides)n are formed in which bases of the two nucleotides of the molecule are self-associated. With ADP3-, the visible C.D. spectrum of this complex is intense and hides the spectra of the complexes formed with other protonated species of ADP; this self-associated complex is detected up to a lower limit of 5 X 10(-4) M concentration. With ATPH3-, a complex exhibiting the same characteristics as the one with ADP3- is formed but in about twenty times less amount which explains why it was not detected by potentiometry. With 0.1 M ATP4-, dimeric (or polymeric) complexes, of 1:2 and 1:1 stoichiometry are observed. With 0.01 M ATP4-, 1:1 monomeric and 2:1 dimeric (or polymeric) complexes are detected. The interactions between Mn2+ ions and ADP or ATP have been studied by C.D. on the UV range. The same species as with Co2+ ions have been found but the 1:2 complex formation with ADP3- was shown to occur to a lesser extent and was not observed below a 10(-2) M ADP concentration. | [
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PMID:25671 | [Reaction between polycytidylic acid and guanosine-5'-triphosphate at neural pH]. | The effect of changing the solution acidity in the interval of pH 7--8 on complex formation between polycytidilyc acid (polyC) and guanosine-5'-triphosphate (GTP) has been studied by the equilibrium dialysis and hydrogen ion titration methods. It is shown that in 1 M NaCl at 3 degrees C the complex stoichiometry undergoes changes in a narrow pH interval being equal to 2 poly C: 1 GTP at pH 7,0--7,3 and to 1 poly C:1 GTP at pH 7,6--8,0. In the presence of GTP the apparent pK of poly C protonation increases by 1,4 PK units and becomes equal to 7,1 in 1 M NaCl at 3 degrees C. Thus, the protonated poly-C takes part in the three-stranded poly-C--GTP complex formation. According to Hill's model of cooperative linear adsorption it is shown that the cooperativity of the three-stranded complex formation is greater than of the two-stranded one. The possibility of drastic changes in the structure of biopolymers with small pH changes in neutral region we have found for the poly-C--GTP system as an example may play an essential role in matrix synthesis and other intracellular processes. | [Reaction between polycytidylic acid and guanosine-5'-triphosphate at neural pH]. The effect of changing the solution acidity in the interval of pH 7--8 on complex formation between polycytidilyc acid (polyC) and guanosine-5'-triphosphate (GTP) has been studied by the equilibrium dialysis and hydrogen ion titration methods. It is shown that in 1 M NaCl at 3 degrees C the complex stoichiometry undergoes changes in a narrow pH interval being equal to 2 poly C: 1 GTP at pH 7,0--7,3 and to 1 poly C:1 GTP at pH 7,6--8,0. In the presence of GTP the apparent pK of poly C protonation increases by 1,4 PK units and becomes equal to 7,1 in 1 M NaCl at 3 degrees C. Thus, the protonated poly-C takes part in the three-stranded poly-C--GTP complex formation. According to Hill's model of cooperative linear adsorption it is shown that the cooperativity of the three-stranded complex formation is greater than of the two-stranded one. The possibility of drastic changes in the structure of biopolymers with small pH changes in neutral region we have found for the poly-C--GTP system as an example may play an essential role in matrix synthesis and other intracellular processes. | [
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PMID:25675 | Nonenzymatic hydrolysis reactions of adenosine 5'-triphosphate and its related compounds. III: Catalytic aspects of some cobalt(III) complexes in ATP-hydrolysis. | Trichlorodiethylenetriaminecobalt (III), [CoCl3dien], which is provided with three good leaving ligands and, hence, capable of binding ATP in a characteristic mode, accelerated effectively and specifically hydrolysis of ATP to ADP and Pi. A kinetic study of the reaction indicated that the rate of hydrolysis was first order with respect to the concentration of ATP in the presence of an excess of [CoCl3dien]. The rate constant was calculated to be 1.05 X 10(-2) min-1 at pH 4.0 (50 degrees C), corresponding to a catalysis of the hydrolysis of ATP by a factor of 150. The complex possessing one good leaving ligand, chlorotetraethylenepentaminecobalt(III), and that having two of them in trans-position, dichlorobis(dimethylglyoximato)cobalt(III) only slightly enhanced the hydrolysis of ATP. Dichloro-cis-alpha- and dichloro-cis-beta-triethylenetetraminecobalt(III) complexes, which have two good leaving ligands and allow chelation of ATP in their coordination sphere, exhibited fairly good activities, although the hydrolysis reactions of ATP occurred in two modes as ATP leads to ADP + Pi and ATP leads to AMP + PPi. The mechanism of ATP-hydrolysis reaction with [CoCl3dien] was also discussed on the basis of the kinetic data. | Nonenzymatic hydrolysis reactions of adenosine 5'-triphosphate and its related compounds. III: Catalytic aspects of some cobalt(III) complexes in ATP-hydrolysis. Trichlorodiethylenetriaminecobalt (III), [CoCl3dien], which is provided with three good leaving ligands and, hence, capable of binding ATP in a characteristic mode, accelerated effectively and specifically hydrolysis of ATP to ADP and Pi. A kinetic study of the reaction indicated that the rate of hydrolysis was first order with respect to the concentration of ATP in the presence of an excess of [CoCl3dien]. The rate constant was calculated to be 1.05 X 10(-2) min-1 at pH 4.0 (50 degrees C), corresponding to a catalysis of the hydrolysis of ATP by a factor of 150. The complex possessing one good leaving ligand, chlorotetraethylenepentaminecobalt(III), and that having two of them in trans-position, dichlorobis(dimethylglyoximato)cobalt(III) only slightly enhanced the hydrolysis of ATP. Dichloro-cis-alpha- and dichloro-cis-beta-triethylenetetraminecobalt(III) complexes, which have two good leaving ligands and allow chelation of ATP in their coordination sphere, exhibited fairly good activities, although the hydrolysis reactions of ATP occurred in two modes as ATP leads to ADP + Pi and ATP leads to AMP + PPi. The mechanism of ATP-hydrolysis reaction with [CoCl3dien] was also discussed on the basis of the kinetic data. | [
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PMID:25672 | [Coupled transport of K+, Cl-, H+ and OH- ions in a liposome suspension]. | By means of the system of ion-selective electrodes the coupling transport of K+, H+ and Cl- ions in liposome suspension was studied. Nigericin and tributyl tin (TBT) were used as inductors of cation and anion exchange. Effect of pH gradient created on the membrane on ionic transport was studied. The latter was shown to control the antiport exchange of both, cations and anions. At the joint effect of nigericin and TBT the yield of K+ and Cl- ions from liposomes independent of the pH gradient was observed. | [Coupled transport of K+, Cl-, H+ and OH- ions in a liposome suspension]. By means of the system of ion-selective electrodes the coupling transport of K+, H+ and Cl- ions in liposome suspension was studied. Nigericin and tributyl tin (TBT) were used as inductors of cation and anion exchange. Effect of pH gradient created on the membrane on ionic transport was studied. The latter was shown to control the antiport exchange of both, cations and anions. At the joint effect of nigericin and TBT the yield of K+ and Cl- ions from liposomes independent of the pH gradient was observed. | [
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PMID:25676 | Stacking interactions between aromatic amino acids and adenine ring of ATP in zinc mediated ternary complexes. | Spectrophotometric studies have provided evidence for zinc-mediated ternary complexes between ATP and aromatic amino acids. The hypochromicity observed in the 260 nm band of ATP increased in the order phenylalanine less than tyrosine less than tryptophan. Adding alanine did not produce any change of the ATP spectrum. The association constant was four fold higher for the ATP-Zinc-Tryptophan complex than for that of the ATP-Zinc-Alanine. The increased stability of the former complex was ascribed to the stacking interaction between indole and adenine rings. The maximum concentration of the ATP-Zinc-Tryptophan complex occurred at about pH 8.0. For these ternary complexes several possible stacked structures involving or not involving N(7) of adenine are discussed. | Stacking interactions between aromatic amino acids and adenine ring of ATP in zinc mediated ternary complexes. Spectrophotometric studies have provided evidence for zinc-mediated ternary complexes between ATP and aromatic amino acids. The hypochromicity observed in the 260 nm band of ATP increased in the order phenylalanine less than tyrosine less than tryptophan. Adding alanine did not produce any change of the ATP spectrum. The association constant was four fold higher for the ATP-Zinc-Tryptophan complex than for that of the ATP-Zinc-Alanine. The increased stability of the former complex was ascribed to the stacking interaction between indole and adenine rings. The maximum concentration of the ATP-Zinc-Tryptophan complex occurred at about pH 8.0. For these ternary complexes several possible stacked structures involving or not involving N(7) of adenine are discussed. | [
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PMID:25673 | [Neuron membrane depolarization under the influence of cyclic-3',5'-adenosine monophosphate and its possible role in the neuronal molecular computer (MC)]. | The separate fourth intracellular microelectrode was used for controlling the conditions of cyclic nucleotide injection in neurons of Helix pomatia. Ionoforetic increase in intracellular cyclic AMP concentration elicits membrane depolarization in many neurons. Phosphodiesterase inhibitors 3-isobutyl-1-methylxantine and SQ-20009 prolong this depolarization and raise its level. In cell F-1 of helix brain sometimes cAMP induces weak hyperpolarization, but this response turns to usual depolarization after 3-isobutyl-1-methylxantine application. It is suggested that cell molecular computer has an analog input, where diffusion of cAMP, cGMP and Ca++ being a modelling process. Adenylate cyclase and guanylate cyclase and ionic channels of membrane are regulated sources. Phosphodiesterases with Ca2+-binding activator proteins are molecular out flowers and protein kinases--detectors that transform the data about the concentrations of cAMP and cGMP into codes for MCC. Protein kinases control over the activity of proteins directly. The depolarization effect on neuron membrane seems to be associated with protein kinase activation or with direct action of cAMP on phospholipase. | [Neuron membrane depolarization under the influence of cyclic-3',5'-adenosine monophosphate and its possible role in the neuronal molecular computer (MC)]. The separate fourth intracellular microelectrode was used for controlling the conditions of cyclic nucleotide injection in neurons of Helix pomatia. Ionoforetic increase in intracellular cyclic AMP concentration elicits membrane depolarization in many neurons. Phosphodiesterase inhibitors 3-isobutyl-1-methylxantine and SQ-20009 prolong this depolarization and raise its level. In cell F-1 of helix brain sometimes cAMP induces weak hyperpolarization, but this response turns to usual depolarization after 3-isobutyl-1-methylxantine application. It is suggested that cell molecular computer has an analog input, where diffusion of cAMP, cGMP and Ca++ being a modelling process. Adenylate cyclase and guanylate cyclase and ionic channels of membrane are regulated sources. Phosphodiesterases with Ca2+-binding activator proteins are molecular out flowers and protein kinases--detectors that transform the data about the concentrations of cAMP and cGMP into codes for MCC. Protein kinases control over the activity of proteins directly. The depolarization effect on neuron membrane seems to be associated with protein kinase activation or with direct action of cAMP on phospholipase. | [
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PMID:25678 | [Activity of gamma-glutamyl transferase of sheep cerebral cortex with respect to amino acids and glutathione]. | gamma-glutamyl Transferase fron Sheep brain cortex capillaries was studied from the point of view of transport of aminoacids across blood brain barrier. Excess substrate inhibition was competitive and observed both with donor (glutathione) and various acceptors (methionine, alanine, tryptophan) but not with arginine. Excess glutathione inhibition of transfer reaction is concomitant with an increase of total reaction (transfer + hydrolysis + autotranspeptidation). With regard to aminoacids, the greater the K'm the stronger the inhibition. This inhibition is the result of formation of a dead complex. Lineweaver-Burk plots 1/v versus 1/[acceptor] give straight lines meeting at the same point, whereas 1/v verus 1/[donor] plots are roughly parallel for high aminoacid concentrations and become secant for the low ones. Replots of slopes vs. 1/[acceptor] are not linear: the lower the aminoacid affinity the more pronounced the slope replot curvature. Thus kinetic patterns are consistent with a branched ping-pong mechanism including a ternary complex (Enzyme-acceptor-H2O) at high or low relative concentration, which balances the two branches. The estimated value of kinetic parameters does not support the hypothesis of major implication of the enzyme in brain uptake of aminoacids. | [Activity of gamma-glutamyl transferase of sheep cerebral cortex with respect to amino acids and glutathione]. gamma-glutamyl Transferase fron Sheep brain cortex capillaries was studied from the point of view of transport of aminoacids across blood brain barrier. Excess substrate inhibition was competitive and observed both with donor (glutathione) and various acceptors (methionine, alanine, tryptophan) but not with arginine. Excess glutathione inhibition of transfer reaction is concomitant with an increase of total reaction (transfer + hydrolysis + autotranspeptidation). With regard to aminoacids, the greater the K'm the stronger the inhibition. This inhibition is the result of formation of a dead complex. Lineweaver-Burk plots 1/v versus 1/[acceptor] give straight lines meeting at the same point, whereas 1/v verus 1/[donor] plots are roughly parallel for high aminoacid concentrations and become secant for the low ones. Replots of slopes vs. 1/[acceptor] are not linear: the lower the aminoacid affinity the more pronounced the slope replot curvature. Thus kinetic patterns are consistent with a branched ping-pong mechanism including a ternary complex (Enzyme-acceptor-H2O) at high or low relative concentration, which balances the two branches. The estimated value of kinetic parameters does not support the hypothesis of major implication of the enzyme in brain uptake of aminoacids. | [
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PMID:25679 | [Glutamate dehydrogenases of unicellular green algae: effects of nitrate and ammonium in vivo]. | The constitution and control by the inorganic nitrogen source of glutamate dehydrogenases of some unicellular green algae have been studied. The Ankistrodesmus braunii and Scenedesmus obliquus cells contain two different glutamate dehydrogenases, one of which is NADP-specific, the other is active with both NAD and NADP. Their synthesis does not depend on the nitrogen source. The activity of NADP-specific glutamate dehydrogenase increases sharply during nitrogen starvation. In Chlorella pyrenoidosa 82 and Ch. ellipsoidea only one constitutive double specific glutamate dehydrogenase is observed. Its activity does not change depending on the nitrogen nutrition conditions. In the cells of the thermophylic Chlorella strain Chlorella sp. K. ammomium induces a de novo synthesis of NADP-specific glutamate dehydrogenase in addition to the constitutive double specific glutamate dehydrogenase. Thus, the algae tested contain constitutive double specific glutamate dehydrogenase. The NADP-specific enzyme is absent in two Chlorella strains, is constitutive in A. braunii and S. obliquus, and is ammonium-inducible in three thermophylic Chlorella strains. | [Glutamate dehydrogenases of unicellular green algae: effects of nitrate and ammonium in vivo]. The constitution and control by the inorganic nitrogen source of glutamate dehydrogenases of some unicellular green algae have been studied. The Ankistrodesmus braunii and Scenedesmus obliquus cells contain two different glutamate dehydrogenases, one of which is NADP-specific, the other is active with both NAD and NADP. Their synthesis does not depend on the nitrogen source. The activity of NADP-specific glutamate dehydrogenase increases sharply during nitrogen starvation. In Chlorella pyrenoidosa 82 and Ch. ellipsoidea only one constitutive double specific glutamate dehydrogenase is observed. Its activity does not change depending on the nitrogen nutrition conditions. In the cells of the thermophylic Chlorella strain Chlorella sp. K. ammomium induces a de novo synthesis of NADP-specific glutamate dehydrogenase in addition to the constitutive double specific glutamate dehydrogenase. Thus, the algae tested contain constitutive double specific glutamate dehydrogenase. The NADP-specific enzyme is absent in two Chlorella strains, is constitutive in A. braunii and S. obliquus, and is ammonium-inducible in three thermophylic Chlorella strains. | [
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PMID:25680 | [Role of pyruvate kinase in non-specific changes of carbon photosynthetic metabolism, caused by the photophosphorylation inhibition]. | The decrease in the level of NADP reduction in chloroplasts under injections of cofactors of pseudocyclic FMN photophosphorylation (vitamin K3 and methylviologen) into pea, tomato and cucumber leaves resulted in the decrease of 14CO2 autotrophic accumulation rate and in the change of distribution of assimilated carbon among the assimilation products. The inhibition of synthesis of labelled sugars and the increase of the content of 3-phosphoglyceric and glyceric acids in the labelled low molecular fraction were observed in all the experiments. Similar changes in the distribution of synthesized in Kalvin cycle labelled products, associated with the inhibition of its reduction unit, were observed under the effect of photophosphorylation uncoupling agents. However, the decrease of ATP/NADP ratio in chloroplasts resulted in the simultaneous increase of fixed 14CO2 incorporation into alanine. The role of pyruvate kinase in "alanine" effect, characteristic of non-specific changes of carbon photosynthetic metabolism, is discussed on the basis of the authors' previous data on the effect of phosphorylation on glycolysis reactions and on the basis of results of ADP introduction into leaf cuts. | [Role of pyruvate kinase in non-specific changes of carbon photosynthetic metabolism, caused by the photophosphorylation inhibition]. The decrease in the level of NADP reduction in chloroplasts under injections of cofactors of pseudocyclic FMN photophosphorylation (vitamin K3 and methylviologen) into pea, tomato and cucumber leaves resulted in the decrease of 14CO2 autotrophic accumulation rate and in the change of distribution of assimilated carbon among the assimilation products. The inhibition of synthesis of labelled sugars and the increase of the content of 3-phosphoglyceric and glyceric acids in the labelled low molecular fraction were observed in all the experiments. Similar changes in the distribution of synthesized in Kalvin cycle labelled products, associated with the inhibition of its reduction unit, were observed under the effect of photophosphorylation uncoupling agents. However, the decrease of ATP/NADP ratio in chloroplasts resulted in the simultaneous increase of fixed 14CO2 incorporation into alanine. The role of pyruvate kinase in "alanine" effect, characteristic of non-specific changes of carbon photosynthetic metabolism, is discussed on the basis of the authors' previous data on the effect of phosphorylation on glycolysis reactions and on the basis of results of ADP introduction into leaf cuts. | [
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PMID:25681 | [Accessibility of sulfhydryl groups to 5,5'-dithiobis-2-nitrobenzoic acid and acid-base properties of bovine and walleye pollock rhodopsin preparations]. | Both the number of exposed SH-groups and the rate of reaction with 5,5'dithiobis-2-nitrobenzoic acid (DTNB) in walleye pollock and bovine rhodopsin depend on a degree of native structure of the preparation to be investigated. The preparations studied can be arranged in the order of increase of these parameters as follows: ROS less than rhodopsin extracted by digitonin less than triton X-100 less than cetyltrimethylammonium bromide (CTAB) less than sodium dodecylsulphate (SDS). After illumination of ROS and digitonin, triton X-100 and CTAB-solubilized rhodopsin, and increase was observed in the number of modified SH-groups. Dark and bleached samples of walleye pollock rhodopsin exhibited a faster rate reaction and a more number of modified SH-groups as compared to bovine preparation. The differences between bovine and walleye pollock preparation disappeared after complete opsin unfolding as a result ROS solubilization in SDS. Six SH-groups per molecule of rhodopsin were modified in both preparation under these conditions. No differences in the number of cysteine residues (10--11), disulfide groups (2), acid (35--40) and base (25--30) titratable groups per rhodopsin molecule were found between bovine and walleye pollock ROS membranes. The isoelectric point of both rhodopsin preparations was within the pH range 5.2--5.6. After proteolysis of ROS with papain, a fragment with molecular weight 24500 +/- 1000 was detected, which contained the same number of SH-groups and cysteine residues as in the case of intact rhodopsin. The results obtained suggest that, in spite of a similar primary structure, the walleye pollock visual pigment has more "loose" and "fluid" space packing in the ROS membrane than the bovine pigment. | [Accessibility of sulfhydryl groups to 5,5'-dithiobis-2-nitrobenzoic acid and acid-base properties of bovine and walleye pollock rhodopsin preparations]. Both the number of exposed SH-groups and the rate of reaction with 5,5'dithiobis-2-nitrobenzoic acid (DTNB) in walleye pollock and bovine rhodopsin depend on a degree of native structure of the preparation to be investigated. The preparations studied can be arranged in the order of increase of these parameters as follows: ROS less than rhodopsin extracted by digitonin less than triton X-100 less than cetyltrimethylammonium bromide (CTAB) less than sodium dodecylsulphate (SDS). After illumination of ROS and digitonin, triton X-100 and CTAB-solubilized rhodopsin, and increase was observed in the number of modified SH-groups. Dark and bleached samples of walleye pollock rhodopsin exhibited a faster rate reaction and a more number of modified SH-groups as compared to bovine preparation. The differences between bovine and walleye pollock preparation disappeared after complete opsin unfolding as a result ROS solubilization in SDS. Six SH-groups per molecule of rhodopsin were modified in both preparation under these conditions. No differences in the number of cysteine residues (10--11), disulfide groups (2), acid (35--40) and base (25--30) titratable groups per rhodopsin molecule were found between bovine and walleye pollock ROS membranes. The isoelectric point of both rhodopsin preparations was within the pH range 5.2--5.6. After proteolysis of ROS with papain, a fragment with molecular weight 24500 +/- 1000 was detected, which contained the same number of SH-groups and cysteine residues as in the case of intact rhodopsin. The results obtained suggest that, in spite of a similar primary structure, the walleye pollock visual pigment has more "loose" and "fluid" space packing in the ROS membrane than the bovine pigment. | [
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PMID:25682 | Magnetic circular dichroism studies of myoglobin, hemoglobin and peroxidase at room and low temperatures. Ferrous high spin derivatives. | The magnetic circular dichroism spectra (MCD) recorded for the visible and near-UV regions of high-spin ferrous derivatives of myoglobin, hemoglobin, hemoglobin dimers and isolated chains as well as of horseradish peroxidase at pH 6.8 and 11.4 have been compared at the room and liquid nitrogen temperatures. The MCD of the Q00- and QV-bands have been shown to be sensitive to structural differences in the heme environment of these hemoproteins. The room temperature visible MCD of native hemoglobin differs from that of myoglobin, hemoglobin dimers and isolated chains as well as from that of model pentacoordinated complex. The MCD of hemoglobin is characterized by the greater value of the MCD intensity ratio of derivative shape A-term in the Q00-band to the A-term in the QV-band. The evidneces are presented for the existence of two pH-dependent forms of ferroperoxidase, the neutral peroxidase shows the "hemoglobin-like" MCD, while the alkaline ferroperoxidase is characterized by the "myoglobin-like" MCD spectrum in the visible region. The differences in the MCD of deoxyhemoglobin and neutral ferroperoxidase as compared with other high-spin ferrous hemoproteins are considered to result from the constraints on heme group imposed by quaternary and/or tertiary protein structure. The differences between hemoporteins which are seen at the room temperature become more pronounced at liquid nitrogen temperature. Except the peak at approximately 580 nm in the MCD of deoxymyoglobin and reduced peroxidase at pH 11.4 the visible MCD does not show appreciable temperature dependent C-terms. The nature of the temperature dependent effect at approximately 580 nm is not clear. The Soret MCD of all hemoproteins studied are similar and are predominantly composed of the derivative-shaped C-terms as revealed by the increase of the MCD peaks approximately in accordance with Boltzmann distribution. The interpretation of temperature-dependent MCD observed for the Soret band has been made in terms of porphyrin to Fe-iron charge-transfer electronic transition which may be assigned as b( pi) leads to 3d. This charge-transfer band is strongly overlapped with usual B(pi --pi*) band resulting in diffuse Soret band. Adopting that only two normal vibrations are sinphase with charge-transfer transition the extracted C-terms of the Soret MCD have been fitted by theoretical dispersion curves. | Magnetic circular dichroism studies of myoglobin, hemoglobin and peroxidase at room and low temperatures. Ferrous high spin derivatives. The magnetic circular dichroism spectra (MCD) recorded for the visible and near-UV regions of high-spin ferrous derivatives of myoglobin, hemoglobin, hemoglobin dimers and isolated chains as well as of horseradish peroxidase at pH 6.8 and 11.4 have been compared at the room and liquid nitrogen temperatures. The MCD of the Q00- and QV-bands have been shown to be sensitive to structural differences in the heme environment of these hemoproteins. The room temperature visible MCD of native hemoglobin differs from that of myoglobin, hemoglobin dimers and isolated chains as well as from that of model pentacoordinated complex. The MCD of hemoglobin is characterized by the greater value of the MCD intensity ratio of derivative shape A-term in the Q00-band to the A-term in the QV-band. The evidneces are presented for the existence of two pH-dependent forms of ferroperoxidase, the neutral peroxidase shows the "hemoglobin-like" MCD, while the alkaline ferroperoxidase is characterized by the "myoglobin-like" MCD spectrum in the visible region. The differences in the MCD of deoxyhemoglobin and neutral ferroperoxidase as compared with other high-spin ferrous hemoproteins are considered to result from the constraints on heme group imposed by quaternary and/or tertiary protein structure. The differences between hemoporteins which are seen at the room temperature become more pronounced at liquid nitrogen temperature. Except the peak at approximately 580 nm in the MCD of deoxymyoglobin and reduced peroxidase at pH 11.4 the visible MCD does not show appreciable temperature dependent C-terms. The nature of the temperature dependent effect at approximately 580 nm is not clear. The Soret MCD of all hemoproteins studied are similar and are predominantly composed of the derivative-shaped C-terms as revealed by the increase of the MCD peaks approximately in accordance with Boltzmann distribution. The interpretation of temperature-dependent MCD observed for the Soret band has been made in terms of porphyrin to Fe-iron charge-transfer electronic transition which may be assigned as b( pi) leads to 3d. This charge-transfer band is strongly overlapped with usual B(pi --pi*) band resulting in diffuse Soret band. Adopting that only two normal vibrations are sinphase with charge-transfer transition the extracted C-terms of the Soret MCD have been fitted by theoretical dispersion curves. | [
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PMID:25683 | Immobilization of Streptomyces flavochromogenes pullulanase on tannic acid and TEAE--cellulose. | Pullulanase was immobilized successfully by simple, inexpensive methods that may be useful for industrial application of this enzyme. A tannin--pullulanase(TP) complex was obtained by addition of tannic acid to the culture filtrate of thermophilic Streptomyces flavochromogenes. TP could be bound to TEAE--cellulose (TTCP). Immobilization in this manner took place with quantitative retention of activity. The immobilized enzymes were stable for more than six months. The optimum temperatures of the native enzyme and TP were both 50 degrees C; that of TTCP was 45 degrees C. In the presence of 5mM Ca2+, the activity of TTCP was increased approximately twofold and the optimum temperature was raised to 50--60 degrees C. Pullulanase was not significantly eluted from TP or TTCP by NaCl solution (0.1--0.5M). | Immobilization of Streptomyces flavochromogenes pullulanase on tannic acid and TEAE--cellulose. Pullulanase was immobilized successfully by simple, inexpensive methods that may be useful for industrial application of this enzyme. A tannin--pullulanase(TP) complex was obtained by addition of tannic acid to the culture filtrate of thermophilic Streptomyces flavochromogenes. TP could be bound to TEAE--cellulose (TTCP). Immobilization in this manner took place with quantitative retention of activity. The immobilized enzymes were stable for more than six months. The optimum temperatures of the native enzyme and TP were both 50 degrees C; that of TTCP was 45 degrees C. In the presence of 5mM Ca2+, the activity of TTCP was increased approximately twofold and the optimum temperature was raised to 50--60 degrees C. Pullulanase was not significantly eluted from TP or TTCP by NaCl solution (0.1--0.5M). | [
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PMID:25686 | Purinergic innervation of the guinea-pig urinary bladder. | 1 A number of criteria for considering adenosine 5'-triphosphate (ATP) as a neurotransmitter in the guinea-pig urinary bladder have been examined. In addition, the effect of tachyphylaxis to ATP on the response to non-adrenergic, non-cholinergic nerve stimulation has been re-examined.2 Quinacrine fluorescence histochemistry revealed a population of nerve fibres, ganglion cells, and nerve bundles in the bladder which were not seen in either the iris or vas deferens, where adrenergic and cholinergic nerves predominate. The distribution and morphology of the quinacrine-positive nerves in the bladder were different from those observed with catecholamine fluorescence and cholinesterase histochemistry, and were unaffected by chemical sympathectomy.3 Release of ATP from the bladder during stimulation of intramural excitatory nerves, in the presence of atropine and guanethidine increased to 3-12 times prestimulation levels. Tetrodotoxin abolished both the contractile response and the increase in ATP release resulting from intramural nerve stimulation. There was no increase in ATP release during contraction resulting from direct muscle stimulation following nerve paralysis with tetrodotoxin.4 Sympathectomy with 6-hydroxydopamine did not affect release of ATP in response to intramural nerve stimulation.5 Release of ATP was dependent on the concentration of calcium ion in the medium.6 Contractions in response to non-adrenergic, non-cholinergic intramural nerve stimulation were closely mimicked by ATP, but not by acetylcholine or histamine.7 Adenosine and dipyridamole reduced the contractions to both ATP and non-cholinergic nerve stimulation.8 2-2'-Pyridylisatogen was not a specific blocker of either ATP or intramural nerve stimulation in the guinea-pig bladder. 2-Substituted imidazolines initiated spontaneous activity making it impossible to assess any blocking action that they may have had.9 Prostaglandins (E(1), E(2) and F(2alpha)) gave weak, slow contractions and an increase in spontaneous activity. Both the response to ATP and non-adrenergic, non-cholinergic nerve stimulation were greatly potentiated in the presence of prostaglandins.10 In the presence of indomethacin the response to non-adrenergic, non-cholinergic nerve stimulation was virtually abolished following desensitization to ATP. | Purinergic innervation of the guinea-pig urinary bladder. 1 A number of criteria for considering adenosine 5'-triphosphate (ATP) as a neurotransmitter in the guinea-pig urinary bladder have been examined. In addition, the effect of tachyphylaxis to ATP on the response to non-adrenergic, non-cholinergic nerve stimulation has been re-examined.2 Quinacrine fluorescence histochemistry revealed a population of nerve fibres, ganglion cells, and nerve bundles in the bladder which were not seen in either the iris or vas deferens, where adrenergic and cholinergic nerves predominate. The distribution and morphology of the quinacrine-positive nerves in the bladder were different from those observed with catecholamine fluorescence and cholinesterase histochemistry, and were unaffected by chemical sympathectomy.3 Release of ATP from the bladder during stimulation of intramural excitatory nerves, in the presence of atropine and guanethidine increased to 3-12 times prestimulation levels. Tetrodotoxin abolished both the contractile response and the increase in ATP release resulting from intramural nerve stimulation. There was no increase in ATP release during contraction resulting from direct muscle stimulation following nerve paralysis with tetrodotoxin.4 Sympathectomy with 6-hydroxydopamine did not affect release of ATP in response to intramural nerve stimulation.5 Release of ATP was dependent on the concentration of calcium ion in the medium.6 Contractions in response to non-adrenergic, non-cholinergic intramural nerve stimulation were closely mimicked by ATP, but not by acetylcholine or histamine.7 Adenosine and dipyridamole reduced the contractions to both ATP and non-cholinergic nerve stimulation.8 2-2'-Pyridylisatogen was not a specific blocker of either ATP or intramural nerve stimulation in the guinea-pig bladder. 2-Substituted imidazolines initiated spontaneous activity making it impossible to assess any blocking action that they may have had.9 Prostaglandins (E(1), E(2) and F(2alpha)) gave weak, slow contractions and an increase in spontaneous activity. Both the response to ATP and non-adrenergic, non-cholinergic nerve stimulation were greatly potentiated in the presence of prostaglandins.10 In the presence of indomethacin the response to non-adrenergic, non-cholinergic nerve stimulation was virtually abolished following desensitization to ATP. | [
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PMID:25687 | Inhibition of [3H]-dihydroalprenolol binding to rat cardiac membranes of various beta-blocking agents. | Binding of [3-H]-dihydroalprenolol ([3-H]-DHA) to rat cardiac membranes was rapid and reversible (k1 = 0.633-0.701 x 10(6) M(-1) S(-1) And k(-1) = 0.0017-0.0043 s(-1). 2 [3-H]-DHA bound to a single class of binding sites with an equilibrium dissociation constant (Kd25degreesc) of 5.7+/-1.1 x 10(-9) M. 3 This binding was specific and the order of potency of adrenoceptor agonists in competing for the binding sites was (-)-isoproterenol greater than (+/-)-isoproternol greater than (+)-isoproterenol greater than (-)-adrenaline greater than (-)-noradrenaline. This was in agreement with the beta1 nature of the cardiac beta-receptors. 4 Cardioselective beta-blockers (i.e. metoprolol, acebutolol and practolol) were shown to have lower binding site affinities, when compared to other blockers. This may be related to steric hindrance by the side-chain at the aromatic end of these molecules. | Inhibition of [3H]-dihydroalprenolol binding to rat cardiac membranes of various beta-blocking agents. Binding of [3-H]-dihydroalprenolol ([3-H]-DHA) to rat cardiac membranes was rapid and reversible (k1 = 0.633-0.701 x 10(6) M(-1) S(-1) And k(-1) = 0.0017-0.0043 s(-1). 2 [3-H]-DHA bound to a single class of binding sites with an equilibrium dissociation constant (Kd25degreesc) of 5.7+/-1.1 x 10(-9) M. 3 This binding was specific and the order of potency of adrenoceptor agonists in competing for the binding sites was (-)-isoproterenol greater than (+/-)-isoproternol greater than (+)-isoproterenol greater than (-)-adrenaline greater than (-)-noradrenaline. This was in agreement with the beta1 nature of the cardiac beta-receptors. 4 Cardioselective beta-blockers (i.e. metoprolol, acebutolol and practolol) were shown to have lower binding site affinities, when compared to other blockers. This may be related to steric hindrance by the side-chain at the aromatic end of these molecules. | [
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PMID:25692 | Glycine high affinity uptake and strychnine binding associated with glycine receptors in the frog central nervous system. | Accumulation of [3H]glycine into synaptosomal fractions occurs by high affinity systems in cerebral cortex, optic tectum, brain stem and spinal cord of the frog. Specific [3H]strychnine binding which appears associated with postsynaptic glycine receptors is also demonstrable in these regions. By contrast, only very low levels of strychnine binding and high affinity glycine uptake occur in higher centers of the rat central nervous system. The relative potencies of small neutral amino acids in competing for [3H]strychnine binding are similar in frog brain and spinal cord. No evidence for a high affinity accumulation of [3H]taurine by synaptosomal fractions of frog spinal cord can be demonstrated. These observations favor glycine rather than taurine as an inhibitory transmitter in frog spinal cord. Moreover, these findings suggest that glycine may have a synaptic role in higher brain centers in the frog. | Glycine high affinity uptake and strychnine binding associated with glycine receptors in the frog central nervous system. Accumulation of [3H]glycine into synaptosomal fractions occurs by high affinity systems in cerebral cortex, optic tectum, brain stem and spinal cord of the frog. Specific [3H]strychnine binding which appears associated with postsynaptic glycine receptors is also demonstrable in these regions. By contrast, only very low levels of strychnine binding and high affinity glycine uptake occur in higher centers of the rat central nervous system. The relative potencies of small neutral amino acids in competing for [3H]strychnine binding are similar in frog brain and spinal cord. No evidence for a high affinity accumulation of [3H]taurine by synaptosomal fractions of frog spinal cord can be demonstrated. These observations favor glycine rather than taurine as an inhibitory transmitter in frog spinal cord. Moreover, these findings suggest that glycine may have a synaptic role in higher brain centers in the frog. | [
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PMID:25696 | The effect of castration, thyroidectomy and haloperidol upon the turnover rates of dopamine and norepinephrine and the kinetic properties of tyrosine hydroxylase in discrete hypothalamic nuclei of the male rat. | Adult male rats were either castrated, thyroidectomized, or treated with haloperidol and the rates of turnover of dopamine (DA) and norepinephrine (NE) in the median eminence (ME), the arcuate and dorsomedial nuclei of the hypothalamus were estimated from the rate of decay of DA and NE concentrations as determined by radioenzymatic assay following blockade of catecholamine synthesis by alpha-methyl-p-tyrosine. The ME of animals similarly prepared was also examined for changes in the total activity and kinetic properties of tyrosine hydroxylase (TH). Four days following the administration of haloperidol (400 microgram/kg) or 10 days after castration, there was a significant increase in the rate of turnover of DA but not NE in the ME accompanied by an increase in the Vmax but not Km for the substrate or cofactor of TH. Furthermore, the administration of haloperidol to hypophysectomized rats also significantly increased the TH activity in the ME, indicating that such changes may occur independently of any changes in serum prolactin levels. Ten days after thyroidectomy, or three weeks after treatment with prophylthiouracil, there was a significant increase in the turnover rate of DA in both the ME and dorsomedial nucleus but not in the arcuate nucleus. No changes in the turnover rates of NE in any of the three areas were observed following thyroidectomy. In the ME, the increase in turnover of DA was accompanied by an increase in the total TH activity (Vmax) as welll as a decrease in Km for tetrahydrobiopterin but not tyrosine. From these results 4 conclusions were drawn: (1) following halperidol, castration, and thyroidectomy there are increases in the activity of dopaminergic terminals within the ME; (2) castration, haloperidol and thyroidectomy may influence the activity of dopaminergic terminals within the ME by different mechanisms; (3) changes in tyrosine hydroxylase and turnover of catecholamines within the ME may occur independently of changes in prolactin levels; and (4) local recurrent afferent circuits may exist in the arcuate nucleus region of the hypothalamus. | The effect of castration, thyroidectomy and haloperidol upon the turnover rates of dopamine and norepinephrine and the kinetic properties of tyrosine hydroxylase in discrete hypothalamic nuclei of the male rat. Adult male rats were either castrated, thyroidectomized, or treated with haloperidol and the rates of turnover of dopamine (DA) and norepinephrine (NE) in the median eminence (ME), the arcuate and dorsomedial nuclei of the hypothalamus were estimated from the rate of decay of DA and NE concentrations as determined by radioenzymatic assay following blockade of catecholamine synthesis by alpha-methyl-p-tyrosine. The ME of animals similarly prepared was also examined for changes in the total activity and kinetic properties of tyrosine hydroxylase (TH). Four days following the administration of haloperidol (400 microgram/kg) or 10 days after castration, there was a significant increase in the rate of turnover of DA but not NE in the ME accompanied by an increase in the Vmax but not Km for the substrate or cofactor of TH. Furthermore, the administration of haloperidol to hypophysectomized rats also significantly increased the TH activity in the ME, indicating that such changes may occur independently of any changes in serum prolactin levels. Ten days after thyroidectomy, or three weeks after treatment with prophylthiouracil, there was a significant increase in the turnover rate of DA in both the ME and dorsomedial nucleus but not in the arcuate nucleus. No changes in the turnover rates of NE in any of the three areas were observed following thyroidectomy. In the ME, the increase in turnover of DA was accompanied by an increase in the total TH activity (Vmax) as welll as a decrease in Km for tetrahydrobiopterin but not tyrosine. From these results 4 conclusions were drawn: (1) following halperidol, castration, and thyroidectomy there are increases in the activity of dopaminergic terminals within the ME; (2) castration, haloperidol and thyroidectomy may influence the activity of dopaminergic terminals within the ME by different mechanisms; (3) changes in tyrosine hydroxylase and turnover of catecholamines within the ME may occur independently of changes in prolactin levels; and (4) local recurrent afferent circuits may exist in the arcuate nucleus region of the hypothalamus. | [
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PMID:25697 | Pharmacologic responses of cells of a neuroblastoma X glioma hybrid clone and modulation of synapses between hybrid cells and mouse myotubes. | Cells of the hybrid clone NG108-15 responded to 5-hydroxytryptamine (5-HT), dopamine or acetylcholine with graded depolarizations involving membrane conductance increases. Responses desensitized during continuous application of the neurotransmitters, and responses to 5-HT and dopamine cross-desensitized: a desensitizing application of one neurotransmitter also desensitized the hybrd cell to the other neurotransmitter. 5-HT and acetylcholine did not cross-desensitize. The hybrid cell 5-HT response was not attenuated by D-LSD, and was blocked by 10(-5) M morphine, although not via binding to naloxone-sensitive opiate receptors. 5-HT or the prostaglandin PGF2alpha caused the release of acetylcholine at the synapses of hybrid cells with mouse myotubes. Application of 5-HT or PGF2alpha also facilitated the synaptic release elicited by hybrid cell action potentials. Following treatment with the antimitotic agent cytosine arabinoside, co-cultures of hybrid cells and mouse myotubes exhibited plentiful synaptic connections only if maintained in medium containing 1 mM dibutyryl cAMP (dBcAMP). After X-irradiation, co-cultures were synaptically active even in the absence of dBcAMP. Thus, methods have been found to regulate both the short-term and long-term synaptic activity of NG108-15 hybrid cells. | Pharmacologic responses of cells of a neuroblastoma X glioma hybrid clone and modulation of synapses between hybrid cells and mouse myotubes. Cells of the hybrid clone NG108-15 responded to 5-hydroxytryptamine (5-HT), dopamine or acetylcholine with graded depolarizations involving membrane conductance increases. Responses desensitized during continuous application of the neurotransmitters, and responses to 5-HT and dopamine cross-desensitized: a desensitizing application of one neurotransmitter also desensitized the hybrd cell to the other neurotransmitter. 5-HT and acetylcholine did not cross-desensitize. The hybrid cell 5-HT response was not attenuated by D-LSD, and was blocked by 10(-5) M morphine, although not via binding to naloxone-sensitive opiate receptors. 5-HT or the prostaglandin PGF2alpha caused the release of acetylcholine at the synapses of hybrid cells with mouse myotubes. Application of 5-HT or PGF2alpha also facilitated the synaptic release elicited by hybrid cell action potentials. Following treatment with the antimitotic agent cytosine arabinoside, co-cultures of hybrid cells and mouse myotubes exhibited plentiful synaptic connections only if maintained in medium containing 1 mM dibutyryl cAMP (dBcAMP). After X-irradiation, co-cultures were synaptically active even in the absence of dBcAMP. Thus, methods have been found to regulate both the short-term and long-term synaptic activity of NG108-15 hybrid cells. | [
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PMID:25699 | A thermodynamic analysis of the amorphous to crystalline calcium phosphate transformation. | A thermodynamic analysis of the precipitation of amorphous calcium phosphate (ACP) and its transformation to crystalline apatite had been made. A nearly constant ion product, over a wide variety of conditions, was obtained for a tricalcium phosphate (TCP)-like phase suggesting that the molecular unit which governs the solubility of ACP may be similar in composition to TCP. The introduction of 10% acid phosphate into the formula for the TCP ion product improves the fit of experimental data and results in an invariant ion product. The stability of ACP in solution was found to be dependent upon its thermodynamic instability with respect to an octacalcium phosphate (OCP)-like phase. The dependence of the induction period for the amorphous to crystalline transformation upon the pH and the Ca/P ratio of the solution is best explained by the assumption that an OCP-like phase is initially nucleated on the surfaces of the ACP particles. The events that occur in the immediate post-transition period suggest the hydrolysis of this OCP-like material to an apatitic phase. | A thermodynamic analysis of the amorphous to crystalline calcium phosphate transformation. A thermodynamic analysis of the precipitation of amorphous calcium phosphate (ACP) and its transformation to crystalline apatite had been made. A nearly constant ion product, over a wide variety of conditions, was obtained for a tricalcium phosphate (TCP)-like phase suggesting that the molecular unit which governs the solubility of ACP may be similar in composition to TCP. The introduction of 10% acid phosphate into the formula for the TCP ion product improves the fit of experimental data and results in an invariant ion product. The stability of ACP in solution was found to be dependent upon its thermodynamic instability with respect to an octacalcium phosphate (OCP)-like phase. The dependence of the induction period for the amorphous to crystalline transformation upon the pH and the Ca/P ratio of the solution is best explained by the assumption that an OCP-like phase is initially nucleated on the surfaces of the ACP particles. The events that occur in the immediate post-transition period suggest the hydrolysis of this OCP-like material to an apatitic phase. | [
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PMID:25701 | Complement activating factor(s) of Trypanosoma lewisi: some physiochemical characteristics of the active components. | Of the complement activating factors present in Trypanosoma lewisi, the major component, a carbohydrate containing substance was further investigated. This component was found to have a lag time of complete activation of 2 CH50 units of bovine complement of approximately 15 minutes while 1% trypsin (a known activator of complement, used as a control system) was capable of instant consumption of a similar quantity of complement. In addition, the complement activating factor of trypanosomes was observed to be stable at 100 degrees C for 15 minutes and over a pH range of 3.0 to 11.0. Thin layer chromatography studies suggested that at least part of the active component contained lipid, perhaps indicating that it may be glycolipid in nature. | Complement activating factor(s) of Trypanosoma lewisi: some physiochemical characteristics of the active components. Of the complement activating factors present in Trypanosoma lewisi, the major component, a carbohydrate containing substance was further investigated. This component was found to have a lag time of complete activation of 2 CH50 units of bovine complement of approximately 15 minutes while 1% trypsin (a known activator of complement, used as a control system) was capable of instant consumption of a similar quantity of complement. In addition, the complement activating factor of trypanosomes was observed to be stable at 100 degrees C for 15 minutes and over a pH range of 3.0 to 11.0. Thin layer chromatography studies suggested that at least part of the active component contained lipid, perhaps indicating that it may be glycolipid in nature. | [
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PMID:25702 | Blood flow in rabbit eyes after keratectomy and corneal transplantation. | We used radio-labelled microspheres to study the distribution of blood flow in different regions of rabbit eyes with inflamed corneas resulting from trauma or allograft reaction. The blood flow in the cornea, the anterior uvea and the regional lymph nodes draining it was increased, but total flow in the eye did not increase. More blood went to the anterior uvea at the expense of the rest of the eye. Blood flow at the limbus was higher in the inflamed corneas than in the controls. | Blood flow in rabbit eyes after keratectomy and corneal transplantation. We used radio-labelled microspheres to study the distribution of blood flow in different regions of rabbit eyes with inflamed corneas resulting from trauma or allograft reaction. The blood flow in the cornea, the anterior uvea and the regional lymph nodes draining it was increased, but total flow in the eye did not increase. More blood went to the anterior uvea at the expense of the rest of the eye. Blood flow at the limbus was higher in the inflamed corneas than in the controls. | [
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PMID:25703 | Phosphate metabolism in blue-green bacteria. V. Factors affecting phosphate uptake in Plectonema boryanum. | Plectonema boryanum requires approximately 5 days of exposure to a culture medium lacking phosphorus to induce the "polyphosphate overplus" phenomenon. At pH9, phosphate uptake is greatest both from normal culture medium and from dilute salt solutions. Phosphate uptake from dilute salt solutions was greatest when Na+ or K+ are combined with Ca2+ or Ca2+ and Mg2+. Cells starved of phosphorus in the presence of a high concentration of K+ or Ca2+ in the medium, and then allowed to take up phosphorus under the same conditions, assimilate more phosphorus than with other major ions. | Phosphate metabolism in blue-green bacteria. V. Factors affecting phosphate uptake in Plectonema boryanum. Plectonema boryanum requires approximately 5 days of exposure to a culture medium lacking phosphorus to induce the "polyphosphate overplus" phenomenon. At pH9, phosphate uptake is greatest both from normal culture medium and from dilute salt solutions. Phosphate uptake from dilute salt solutions was greatest when Na+ or K+ are combined with Ca2+ or Ca2+ and Mg2+. Cells starved of phosphorus in the presence of a high concentration of K+ or Ca2+ in the medium, and then allowed to take up phosphorus under the same conditions, assimilate more phosphorus than with other major ions. | [
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PMID:25704 | Effect of osmotic potential, pH, and temperature on the growth of a helical, motile mycoplasma causing corn stunt disease. | Growth characteristics of corn stunt spiroplasma, a helical, motile mycoplasma, were studied over a range of osmolality, pH, and temperature in a simple medium containing 20% (v/v) agamma horse serum, 1.5% (w/v) PPLO broth, and various concentrations of sucrose. The spiroplasma was able to grow in a wide spectrum of osmolalities from 360 to 1120 mosm. Optimal growth was observed in media that contained 0.25-0.35 M sucrose. The organism became longer and thinner in media adjusted to 0.65 M sucrose or more. The spiroplasma lost helicity and motility immediately after transfer to media at pH 5.4 or lower. Optimal pH for growth was 7.2. No growth was observed at pH lower than 5.4 or higher than 8.0. Optimal temperature for growth was 32 degrees C. Very little or no growth was observed at temperatures lower than 15 degrees C or higher than 35 degrees C. | Effect of osmotic potential, pH, and temperature on the growth of a helical, motile mycoplasma causing corn stunt disease. Growth characteristics of corn stunt spiroplasma, a helical, motile mycoplasma, were studied over a range of osmolality, pH, and temperature in a simple medium containing 20% (v/v) agamma horse serum, 1.5% (w/v) PPLO broth, and various concentrations of sucrose. The spiroplasma was able to grow in a wide spectrum of osmolalities from 360 to 1120 mosm. Optimal growth was observed in media that contained 0.25-0.35 M sucrose. The organism became longer and thinner in media adjusted to 0.65 M sucrose or more. The spiroplasma lost helicity and motility immediately after transfer to media at pH 5.4 or lower. Optimal pH for growth was 7.2. No growth was observed at pH lower than 5.4 or higher than 8.0. Optimal temperature for growth was 32 degrees C. Very little or no growth was observed at temperatures lower than 15 degrees C or higher than 35 degrees C. | [
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PMID:25705 | Brain metabolism and arterial acid-base balance following bilateral carotid occlusion in normotensive and experimental hypertensive rats. | The effects of bilateral common carotid artery occlusion on brain metabolism and arterial acid-base balance were studied in normotensive and experimental renovascular hypertensive rats. One hour after carotid occlusion in hypertensive rats, supratentorial lactate increased to 383% and lactate-pyruvate ratio to 280% of the controls, while adenosine triphosphate (ATP) decreased to 69%. These metabolic changes were thought to be due to cerebral ischemia. Arterial pCO2 was lowered and the pH was raised in the hypertensive animals due to cerebral ischemia induced hyperventilation. In the normotensive rats, carotid occlusion had minimal effects on cerebral metabolism and arterial acid-base balance. These results suggest that hypertensive rats are more susceptible to cerebral ischemia caused by carotid occlusion than normotensive rats. Increased cerebrovascular resistance in hypertension is discussed as a causal factor in cerebral ischemia. | Brain metabolism and arterial acid-base balance following bilateral carotid occlusion in normotensive and experimental hypertensive rats. The effects of bilateral common carotid artery occlusion on brain metabolism and arterial acid-base balance were studied in normotensive and experimental renovascular hypertensive rats. One hour after carotid occlusion in hypertensive rats, supratentorial lactate increased to 383% and lactate-pyruvate ratio to 280% of the controls, while adenosine triphosphate (ATP) decreased to 69%. These metabolic changes were thought to be due to cerebral ischemia. Arterial pCO2 was lowered and the pH was raised in the hypertensive animals due to cerebral ischemia induced hyperventilation. In the normotensive rats, carotid occlusion had minimal effects on cerebral metabolism and arterial acid-base balance. These results suggest that hypertensive rats are more susceptible to cerebral ischemia caused by carotid occlusion than normotensive rats. Increased cerebrovascular resistance in hypertension is discussed as a causal factor in cerebral ischemia. | [
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] |
PMID:25706 | Cardiac pharmacology and cardiomyopathy in Friedreich's ataxia. | Friedreich's ataxia is almost always associated with a cardiomyopathy. The cardiomyopathy and its attendant cardiopulmonary sequelae is the usual cause of death in this disease. The author reviews the known pharmacology of the heart, particularly as it applies to hypertrophic cardiomyopathy. The important role played by calcium and the possible role of taurine is stressed. Therapeutic possibilities are mentioned. | Cardiac pharmacology and cardiomyopathy in Friedreich's ataxia. Friedreich's ataxia is almost always associated with a cardiomyopathy. The cardiomyopathy and its attendant cardiopulmonary sequelae is the usual cause of death in this disease. The author reviews the known pharmacology of the heart, particularly as it applies to hypertrophic cardiomyopathy. The important role played by calcium and the possible role of taurine is stressed. Therapeutic possibilities are mentioned. | [
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PMID:25707 | Treatment of arterial hypertension with tienilic acid, a new diuretic with uricosuric properties. | Tienilic acid--2,3-dichloro-4-(2-thienyl-carbonyl)phenoxyacetic acid--is a new diuretic with uricosuric properties. Nineteen patients with moderate arterial hypertension were treated for 5 consecutive weeks in a randomized fashion in a double-blind study with either tienilic acid or hydrochlorothiazide. Blood pressure was significantly reduced and to the same degree with both drugs. In 7 of the 11 patients receiving tienilic acid the daily dose was increased from 250 to 500 mg after 2 weeks, and in 2 of the 8 patients taking hydrochlorothiazide the daily dose was increased from 50 to 100 mg. Because of the potent uricosuric action of tienilic acid the mean serum urate concentration decreased from 6.3 to 3.3 mg/dL in the patients taking the drug. In contrast, the patients receiving hydrochlorothiazide the mean serum urate concentration increased from 6.1 to 7.8 mg/dL. Moderate hypokalemia of almost identical degree (mean serum potassium values 3.6 and 3.5 mmol/L) and mild metabolic alkalosis were observed in both groups. Tienilic acid had a marked hypocalciuric effect, which was of the same magnitude as the observed with hydrochlorothiazide. During the 5 weeks of treatment no significant change in renal or liver function was observed in either group. There were no hematologic complications and the drug was remarkably well tolerated. Tienilic acid, because of its unique character as a diuretic, hypouricemic and antihypertensive agent, should become the preferred drug for the treatment of arterial hypertension. | Treatment of arterial hypertension with tienilic acid, a new diuretic with uricosuric properties. Tienilic acid--2,3-dichloro-4-(2-thienyl-carbonyl)phenoxyacetic acid--is a new diuretic with uricosuric properties. Nineteen patients with moderate arterial hypertension were treated for 5 consecutive weeks in a randomized fashion in a double-blind study with either tienilic acid or hydrochlorothiazide. Blood pressure was significantly reduced and to the same degree with both drugs. In 7 of the 11 patients receiving tienilic acid the daily dose was increased from 250 to 500 mg after 2 weeks, and in 2 of the 8 patients taking hydrochlorothiazide the daily dose was increased from 50 to 100 mg. Because of the potent uricosuric action of tienilic acid the mean serum urate concentration decreased from 6.3 to 3.3 mg/dL in the patients taking the drug. In contrast, the patients receiving hydrochlorothiazide the mean serum urate concentration increased from 6.1 to 7.8 mg/dL. Moderate hypokalemia of almost identical degree (mean serum potassium values 3.6 and 3.5 mmol/L) and mild metabolic alkalosis were observed in both groups. Tienilic acid had a marked hypocalciuric effect, which was of the same magnitude as the observed with hydrochlorothiazide. During the 5 weeks of treatment no significant change in renal or liver function was observed in either group. There were no hematologic complications and the drug was remarkably well tolerated. Tienilic acid, because of its unique character as a diuretic, hypouricemic and antihypertensive agent, should become the preferred drug for the treatment of arterial hypertension. | [
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PMID:25708 | Minor tranquillizers in somatic disorders. | Conclusive evidence of improved outcome due to adjunctive anxiolytic therapy in some somatic conditions is lacking. However, such therapy may facilitate patient management without being "curative". The resulting improved feeling of well-being may be of value in the management of gastrointestinal disorders, migraine and myocardial infarction. Negative effects may be observed in acute respiratory conditions, especially during acute exacerbations of chronic conditions, with the administration of benzodiazepines; hence they should be used with caution. The use of these agents in treating persons with hypertension seems to be of no value and may even be detrimental. Careful evaluation of each case is desirable, and treatment should be planned with its termination in mind. | Minor tranquillizers in somatic disorders. Conclusive evidence of improved outcome due to adjunctive anxiolytic therapy in some somatic conditions is lacking. However, such therapy may facilitate patient management without being "curative". The resulting improved feeling of well-being may be of value in the management of gastrointestinal disorders, migraine and myocardial infarction. Negative effects may be observed in acute respiratory conditions, especially during acute exacerbations of chronic conditions, with the administration of benzodiazepines; hence they should be used with caution. The use of these agents in treating persons with hypertension seems to be of no value and may even be detrimental. Careful evaluation of each case is desirable, and treatment should be planned with its termination in mind. | [
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PMID:25709 | Hormonal regulation and the effects of glucose on tyrosine aminotransferase activity in adult rat hepatocytes cultured on floating collagen membranes. | Adult rat parenchymal hepatocytes can be maintained in primary culture on floating collagen membranes of prolonged periods of time. In this system the enzyme tyrosine aminotransferase is induced by glucagon, (10(-6) to 10(-8) M) hydrocortisone (10(-5) to 10(-8) M), and cyclic adenosine 3':5'-monophosphate (cAMP) (10(-4) to 10(-5) M). Epinephrine (10(-4) M) induces the enzyme only in the presence of hydrocortisone. Addition of actinomycin D inhibited the induction of tyrosine aminotransferase by hydrocortisone and cAMP. Maintenance of the cultured hepatocytes in the presence of glucose (3g/liter) results in partial suppression of the inducing effects of glucagon and cAMP. Cyclic quanosine 3':5'-monophosphate does not mimic the effects of glucose. These results demonstrate that the phenomenon of glucose repression of enzyme induction, demonstrated in vivo in mammalian liver, is independent of changes in levels of serum hormones, which occur in vivo as a result of glucose administration. This study also demonstrates that glucose repression is not mediated by changes in intracellular levels of cAMP and cyclic quanosine 3':5'-monophosphate. | Hormonal regulation and the effects of glucose on tyrosine aminotransferase activity in adult rat hepatocytes cultured on floating collagen membranes. Adult rat parenchymal hepatocytes can be maintained in primary culture on floating collagen membranes of prolonged periods of time. In this system the enzyme tyrosine aminotransferase is induced by glucagon, (10(-6) to 10(-8) M) hydrocortisone (10(-5) to 10(-8) M), and cyclic adenosine 3':5'-monophosphate (cAMP) (10(-4) to 10(-5) M). Epinephrine (10(-4) M) induces the enzyme only in the presence of hydrocortisone. Addition of actinomycin D inhibited the induction of tyrosine aminotransferase by hydrocortisone and cAMP. Maintenance of the cultured hepatocytes in the presence of glucose (3g/liter) results in partial suppression of the inducing effects of glucagon and cAMP. Cyclic quanosine 3':5'-monophosphate does not mimic the effects of glucose. These results demonstrate that the phenomenon of glucose repression of enzyme induction, demonstrated in vivo in mammalian liver, is independent of changes in levels of serum hormones, which occur in vivo as a result of glucose administration. This study also demonstrates that glucose repression is not mediated by changes in intracellular levels of cAMP and cyclic quanosine 3':5'-monophosphate. | [
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PMID:25712 | Purification and some properties of Bacillus macerans cycloamylose (cyclodextrin) glucanotransferase. | Bacillus macerans cycloamylose (cyclodextrin) glucanotransferase (EC 2.4.1.19) was purified by the technique of starch adsorption and DEAE-cellulose column chromatography, and then crystallized from an ammonium sulfate solution containing mM calcium chloride. The crystals of the enzyme were rod-shaped and showed a single band by disc-gel electrophorsis. The purified enzyme was dissociated into two subunits by sodium dodecyl sulfate-disc electrophoresis. The subunits had no enzyme activity. Details of each purification step and some properties of the enzyme are described in this paper. | Purification and some properties of Bacillus macerans cycloamylose (cyclodextrin) glucanotransferase. Bacillus macerans cycloamylose (cyclodextrin) glucanotransferase (EC 2.4.1.19) was purified by the technique of starch adsorption and DEAE-cellulose column chromatography, and then crystallized from an ammonium sulfate solution containing mM calcium chloride. The crystals of the enzyme were rod-shaped and showed a single band by disc-gel electrophorsis. The purified enzyme was dissociated into two subunits by sodium dodecyl sulfate-disc electrophoresis. The subunits had no enzyme activity. Details of each purification step and some properties of the enzyme are described in this paper. | [
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PMID:25714 | Evidence for the detrimental effect of adrenaline infused to healthy dogs in doses imitating spontaneous secretion after coronary occlusion. | We have previously shown that acute coronary occlusion in the dog is often accompanied by increased adrenaline release into the blood. In the present study the consequences of this humoral reaction were studied in anaesthetised healthy mongrel dogs subjected to adrenaline infusion administered at a rate relevant to spontaneous release of this amine in coronary occlusion. Adrenaline was infused in a dose of 1.2 microgram.kg-1.min-1 for 4 h. Dogs receiving saline served as the control. Adrenaline administration led to the decrease in insulin/glucose ratio, to a significant fall in serum triiodothyronine and in blood pH. Free fatty acid levels doubled. Histochemically, a diminution in succinic dehydrogenase and ATPase activity in adrenaline-treated hearts was found. A significant fall in the activity of mitochondrial hexokinase in these hearts was detected spectrophotometrically. Electron microscopic study revealed alterations in the mitochondrial structure. These findings indicate that an excess of adrenaline in ammounts similar to that seen in experimental infarction leads to profound metabolic and hormonal disturbances and exerts a detrimental effect upon myocardium. | Evidence for the detrimental effect of adrenaline infused to healthy dogs in doses imitating spontaneous secretion after coronary occlusion. We have previously shown that acute coronary occlusion in the dog is often accompanied by increased adrenaline release into the blood. In the present study the consequences of this humoral reaction were studied in anaesthetised healthy mongrel dogs subjected to adrenaline infusion administered at a rate relevant to spontaneous release of this amine in coronary occlusion. Adrenaline was infused in a dose of 1.2 microgram.kg-1.min-1 for 4 h. Dogs receiving saline served as the control. Adrenaline administration led to the decrease in insulin/glucose ratio, to a significant fall in serum triiodothyronine and in blood pH. Free fatty acid levels doubled. Histochemically, a diminution in succinic dehydrogenase and ATPase activity in adrenaline-treated hearts was found. A significant fall in the activity of mitochondrial hexokinase in these hearts was detected spectrophotometrically. Electron microscopic study revealed alterations in the mitochondrial structure. These findings indicate that an excess of adrenaline in ammounts similar to that seen in experimental infarction leads to profound metabolic and hormonal disturbances and exerts a detrimental effect upon myocardium. | [
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PMID:25715 | Locomotion and neuromuscular system of Aglantha digitale. | Aglantha digitale swims in two ways: a slow rhythmical swim typical of hydromedusae in general and a sudden rapid movement that appears to be an escape response. The swimming musculature is an extremely well developed striated circular muscle layer that possesses a sarcoplasmic reticulum. The nervous system of this species can be divided into three units: an inner nerve ring and an outer nerve ring, which are joined by unusually large transmesogleal pathways, a group of giant axons that extends over the surface of the swimming muscle, and the radial canal. Well developed ciliated sensory cells are located on the exumbrellar surface of the margin. Consideration of these properties of the organisation of this species suggests that normal slow swimming is controlled by a mechanism similar to that found in other medusae, while the escape response is the result of the action of the giant axons. | Locomotion and neuromuscular system of Aglantha digitale. Aglantha digitale swims in two ways: a slow rhythmical swim typical of hydromedusae in general and a sudden rapid movement that appears to be an escape response. The swimming musculature is an extremely well developed striated circular muscle layer that possesses a sarcoplasmic reticulum. The nervous system of this species can be divided into three units: an inner nerve ring and an outer nerve ring, which are joined by unusually large transmesogleal pathways, a group of giant axons that extends over the surface of the swimming muscle, and the radial canal. Well developed ciliated sensory cells are located on the exumbrellar surface of the margin. Consideration of these properties of the organisation of this species suggests that normal slow swimming is controlled by a mechanism similar to that found in other medusae, while the escape response is the result of the action of the giant axons. | [
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PMID:25719 | Takayasu's disease in twin sisters. Possible genetic factors. | Takayasu's disease is well-known for its characteristic clinical features and its elusive etiology. Recently, we encountered twin Japanese sisters, both of whom were diagnosed as having Takayasu's disease. The parents, two sisters, and one brother are healthy. Family history revealed the parents are first cousins. Analyses of serveral blood types and HLA typing were performed on all members of the family, and it was confirmed that these twins are monozygotic. Moreover, HLA typing analyses revealed that one haplotype found in the father was passed only to these twins. The history of consanguinity of the parents, the occurrence in twins, and the results of HLA typing suggest a genetic factor in the etiology of Takayasu's disease. | Takayasu's disease in twin sisters. Possible genetic factors. Takayasu's disease is well-known for its characteristic clinical features and its elusive etiology. Recently, we encountered twin Japanese sisters, both of whom were diagnosed as having Takayasu's disease. The parents, two sisters, and one brother are healthy. Family history revealed the parents are first cousins. Analyses of serveral blood types and HLA typing were performed on all members of the family, and it was confirmed that these twins are monozygotic. Moreover, HLA typing analyses revealed that one haplotype found in the father was passed only to these twins. The history of consanguinity of the parents, the occurrence in twins, and the results of HLA typing suggest a genetic factor in the etiology of Takayasu's disease. | [
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PMID:25720 | Coronary arterial spasm and Prinzmetal's variant form of angina induced by hyperventilation and Tris-buffer infusion. | Vigorous hyperventilation was induced for five minutes immediately after a five-minute infusion of 100 ml of Tris-buffer (pH 10) in nine patients with Prinzmetal's variant angina. In eight of the patients, chest pain with ischemic changes in the electrocardiogram occurred during this procedure or within five minutes after it ended. Coronary arterial spasm appeared after the procedure and disappeared after the administration of nitroglycerin in all four patients in whom coronary cinearteriography was performed. This was evident both before and after the procedure and after sublingual administration of nitroglycerin (0.6 mg). The oral administration of 90 mg of diltiazem, a calcium antagonistic drug, two hours before, completely suppressed the attack induced by the procedure in all of the five patients who received this drug. We conclude that hyperventilation plus Tris-buffer infusion induces coronary arterial spasm and anginal attack in patients with Prinzmetal's variant angina and that diltiazem suppresses these reactions. | Coronary arterial spasm and Prinzmetal's variant form of angina induced by hyperventilation and Tris-buffer infusion. Vigorous hyperventilation was induced for five minutes immediately after a five-minute infusion of 100 ml of Tris-buffer (pH 10) in nine patients with Prinzmetal's variant angina. In eight of the patients, chest pain with ischemic changes in the electrocardiogram occurred during this procedure or within five minutes after it ended. Coronary arterial spasm appeared after the procedure and disappeared after the administration of nitroglycerin in all four patients in whom coronary cinearteriography was performed. This was evident both before and after the procedure and after sublingual administration of nitroglycerin (0.6 mg). The oral administration of 90 mg of diltiazem, a calcium antagonistic drug, two hours before, completely suppressed the attack induced by the procedure in all of the five patients who received this drug. We conclude that hyperventilation plus Tris-buffer infusion induces coronary arterial spasm and anginal attack in patients with Prinzmetal's variant angina and that diltiazem suppresses these reactions. | [
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PMID:25721 | Characteristics of the inhibition of serum alkaline phosphatase by theophylline. | 1. The effect of various parameters on the inhibition of alkaline phosphatase activity by theophylline was studied. The influence of pH is great, being optimum for a value of 9.4. The temperature and the magnesium ion concentration have no to low effect. 2. The nature of the substrate and the nature of the buffer in which the enzymatic activity is measured have an effect:by measuring the activity of alkaline phosphatase in serum by a method with phenolphthaleinphosphate in Tris buffer, a negligible interference by therapeutic or toxic levels of theophylline is observed. 3. The inhibition by theophylline varies greatly with the origin of alkaline phosphatase: the liver isoenzyme is strongly inhibited, the intestinal one to a lesser degree and the placental isoenzyme almost not inhibited. 4. The inhibition of the liver and intestinal isoenzymes are uncompetitive and the inhibition constants were measured. | Characteristics of the inhibition of serum alkaline phosphatase by theophylline. 1. The effect of various parameters on the inhibition of alkaline phosphatase activity by theophylline was studied. The influence of pH is great, being optimum for a value of 9.4. The temperature and the magnesium ion concentration have no to low effect. 2. The nature of the substrate and the nature of the buffer in which the enzymatic activity is measured have an effect:by measuring the activity of alkaline phosphatase in serum by a method with phenolphthaleinphosphate in Tris buffer, a negligible interference by therapeutic or toxic levels of theophylline is observed. 3. The inhibition by theophylline varies greatly with the origin of alkaline phosphatase: the liver isoenzyme is strongly inhibited, the intestinal one to a lesser degree and the placental isoenzyme almost not inhibited. 4. The inhibition of the liver and intestinal isoenzymes are uncompetitive and the inhibition constants were measured. | [
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PMID:25722 | A stable blood product for pH-blood-gas quality control. | We describe how to prepare, store, and use a hemolyzed blood product for simultaneous pH, pCO2, and pO2 quality control. Tonometry of the blood product with two oxygen and two carbon dioxide concentrations resulted in consistent and reproducible values during 38 weeks. The resulting pH values were consistent and reproducible, demonstrating the metabolic acid-base stability of the blood product. We conclude that the proper preparation, storage, and use of the product results in consistent, reproducible, and economical quality control for pH, pCO2 and pO2 blood measurements. | A stable blood product for pH-blood-gas quality control. We describe how to prepare, store, and use a hemolyzed blood product for simultaneous pH, pCO2, and pO2 quality control. Tonometry of the blood product with two oxygen and two carbon dioxide concentrations resulted in consistent and reproducible values during 38 weeks. The resulting pH values were consistent and reproducible, demonstrating the metabolic acid-base stability of the blood product. We conclude that the proper preparation, storage, and use of the product results in consistent, reproducible, and economical quality control for pH, pCO2 and pO2 blood measurements. | [
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PMID:25723 | Simultaneous detection and quantitation of drugs commonly involved in self-administered overdoses. | The system described here is designed for ease of detection and quantitation of tricyclic antidepressants, benzodiazepines, and other tranquilizers now commonly found in self poisoning. An ether extract of serum is purified by acid transfer, back-extracted into ether, dried, and evaporated. The residue is run on a thin-layer plate against standards and inspected under 254-nm light. Depending on requirements, the amount of unknown may then be estimated or further chromatography performed in a different solvent. Quantitation and further confirmation of identity by staining follow. The equipment needed is very simple and many samples can be handled simultaneously and completed within a working day. | Simultaneous detection and quantitation of drugs commonly involved in self-administered overdoses. The system described here is designed for ease of detection and quantitation of tricyclic antidepressants, benzodiazepines, and other tranquilizers now commonly found in self poisoning. An ether extract of serum is purified by acid transfer, back-extracted into ether, dried, and evaporated. The residue is run on a thin-layer plate against standards and inspected under 254-nm light. Depending on requirements, the amount of unknown may then be estimated or further chromatography performed in a different solvent. Quantitation and further confirmation of identity by staining follow. The equipment needed is very simple and many samples can be handled simultaneously and completed within a working day. | [
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PMID:25724 | Optimal conditions and comparison of lactate dehydrogenase catalysis of the lactate-to-pyruvate and pyruvate-to-lactate reactions in human serum at 25, 30, and 37 degrees C. | We report optimal conditions for assaying highly purified human lactate dehydrogenase isoenzymes with the lactate-to-pyruvate and pyruvate-to-lactate reactions, as they apply to human serum. Interconversion of results between reactions is not practicable. Measurements of lactate dehydrogenase in either reaction direction at 25, 30, or 37 degrees C can be equally reliable if the volume fraction and the resulting deltaA/min is small. However, for interinstrument and interlaboratory comparisons, results from the lactate-to-pyruvate reaction are more reliable. | Optimal conditions and comparison of lactate dehydrogenase catalysis of the lactate-to-pyruvate and pyruvate-to-lactate reactions in human serum at 25, 30, and 37 degrees C. We report optimal conditions for assaying highly purified human lactate dehydrogenase isoenzymes with the lactate-to-pyruvate and pyruvate-to-lactate reactions, as they apply to human serum. Interconversion of results between reactions is not practicable. Measurements of lactate dehydrogenase in either reaction direction at 25, 30, or 37 degrees C can be equally reliable if the volume fraction and the resulting deltaA/min is small. However, for interinstrument and interlaboratory comparisons, results from the lactate-to-pyruvate reaction are more reliable. | [
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] |
PMID:25726 | Liquid chromatographic determination of urinary dopamine and norepinephrine as fluorescamine derivatives. | Dopamine (DM) and norepinephrine (NE) with 3,4-dihydroxybenzylamine as internal standard in normal human urine were extracted with alumina, labeled with fluorescamine and determined fluorometrically by liquid chromatography. The method is simple and in the case of excretion of DM in urines of subjects receiving 1-dopa, even the alumina treatment was unnecessary. The C.V. of method was 4.3% and 4.5% for DM and NE, respectively. The mean contents of DM and NE in 7 normal urines were 182 and 35.5 ng/mg creatinine, respectively. | Liquid chromatographic determination of urinary dopamine and norepinephrine as fluorescamine derivatives. Dopamine (DM) and norepinephrine (NE) with 3,4-dihydroxybenzylamine as internal standard in normal human urine were extracted with alumina, labeled with fluorescamine and determined fluorometrically by liquid chromatography. The method is simple and in the case of excretion of DM in urines of subjects receiving 1-dopa, even the alumina treatment was unnecessary. The C.V. of method was 4.3% and 4.5% for DM and NE, respectively. The mean contents of DM and NE in 7 normal urines were 182 and 35.5 ng/mg creatinine, respectively. | [
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PMID:25727 | Characterization of the acid beta-D-galactosidases from human urine. | Acid beta-D-galactosidases (EC 3.2.1.23) from human urine samples have been characterized using GM1-ganglioside, asialofetuin, and 4-MU-beta-D galactopyranoside. Sepharose 6-B column chromatography of crude urine supernatant fluids resolved three forms of acid beta-D-galactosidase activity with apparent molecular weights of 500 X 10(3)--700 X 10(3) (I), 90 X 10(3)--120 X 10(3) (II), and 20 X 10(3)--27 X 10(3) (III), which hydrolyzed 4-MU-beta-D-galactopyranoside, GM1-ganglioside and asialofetuin. The crude urine supernatant fluids and the separated forms of acid beta-D-galactosidase exhibited similar apparent KM values for the respective substrates. Starch gel electrophoresis of urine samples at pH 7.0 revealed a slow anodally migrating form of acid beta-D-galactosidase which electrophoretically corresponded to form I and a faster anodally migrating form corresponding to form II. Form III migrated as a composite of forms I and II suggesting that aggregation to the larger molecular weight activity forms occurred during starch gel electrophoresis. This report represents the first characterization of urinary acid beta-D-galactosidase with respect to naturally occurring glycolipid and glycoprotein substrates. In addition, data is presented to indicate that the enzyme may be composed of an enzymatically active form with an apparent molecular weight of 20 X 10(3)--27 X10(3), which is also capable of hydrolyzing the glycolipid and glycoprotein substrates. | Characterization of the acid beta-D-galactosidases from human urine. Acid beta-D-galactosidases (EC 3.2.1.23) from human urine samples have been characterized using GM1-ganglioside, asialofetuin, and 4-MU-beta-D galactopyranoside. Sepharose 6-B column chromatography of crude urine supernatant fluids resolved three forms of acid beta-D-galactosidase activity with apparent molecular weights of 500 X 10(3)--700 X 10(3) (I), 90 X 10(3)--120 X 10(3) (II), and 20 X 10(3)--27 X 10(3) (III), which hydrolyzed 4-MU-beta-D-galactopyranoside, GM1-ganglioside and asialofetuin. The crude urine supernatant fluids and the separated forms of acid beta-D-galactosidase exhibited similar apparent KM values for the respective substrates. Starch gel electrophoresis of urine samples at pH 7.0 revealed a slow anodally migrating form of acid beta-D-galactosidase which electrophoretically corresponded to form I and a faster anodally migrating form corresponding to form II. Form III migrated as a composite of forms I and II suggesting that aggregation to the larger molecular weight activity forms occurred during starch gel electrophoresis. This report represents the first characterization of urinary acid beta-D-galactosidase with respect to naturally occurring glycolipid and glycoprotein substrates. In addition, data is presented to indicate that the enzyme may be composed of an enzymatically active form with an apparent molecular weight of 20 X 10(3)--27 X10(3), which is also capable of hydrolyzing the glycolipid and glycoprotein substrates. | [
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PMID:25728 | Lipoprotein-X and diagnosis of cholestasis: comparison with other biochemical parameters and liver biopsy. | The presence or absence of histological signs of cholestasis (on the basis of liver specimens obtained by means of liver biopsy) was compared with total bilirubin, alkaline phosphatase, gamma-glutamyl transpeptidase, ornithine carbamoyltransferase, serum glutamic oxaloacetic transaminase levels and LP-X test in 157 patients suffering from different liver diseases. The LP-X test was positive in 93% of the 59 cases in whom histological evidence of cholestasis was observed and negative 95% of the 98 cases in whom histological examination was negative. LP-X concurs more frequently with the histological picture than do total bilirubin and alkaline phosphatase. These data confirm that LP-X test is more specific than the tests traditionally used to demonstrate or exclude cholestasis. An increment in gamma-GT levels was observed in 97% of the patients with a positive LP-X test. These clinical results have been discussed in the light of recent data regarding the mechanism of lipoprotein-X formation and the possible relationships between LP-X and gamma-glutamyl transpeptidase. | Lipoprotein-X and diagnosis of cholestasis: comparison with other biochemical parameters and liver biopsy. The presence or absence of histological signs of cholestasis (on the basis of liver specimens obtained by means of liver biopsy) was compared with total bilirubin, alkaline phosphatase, gamma-glutamyl transpeptidase, ornithine carbamoyltransferase, serum glutamic oxaloacetic transaminase levels and LP-X test in 157 patients suffering from different liver diseases. The LP-X test was positive in 93% of the 59 cases in whom histological evidence of cholestasis was observed and negative 95% of the 98 cases in whom histological examination was negative. LP-X concurs more frequently with the histological picture than do total bilirubin and alkaline phosphatase. These data confirm that LP-X test is more specific than the tests traditionally used to demonstrate or exclude cholestasis. An increment in gamma-GT levels was observed in 97% of the patients with a positive LP-X test. These clinical results have been discussed in the light of recent data regarding the mechanism of lipoprotein-X formation and the possible relationships between LP-X and gamma-glutamyl transpeptidase. | [
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PMID:25729 | Studies on alkaline phosphatase isoenzymes in hepatic diseases. Relation to gamma-glutamyltransferase. | Isoenzymes of alkaline phosphatase (ALP) and total gamma-glutamyltransferase (gamma GT) have been studied in patients with increased total ALP. Fractionation of alkaline phosphatase yielded clinical information which could not be obtained by determination ALP and gamma GT alone. 1. There was a high degree of correlation between isoALP 1 (biliary band) and total gamma GT. 2. The ALP2 fraction increases after cytolysis in acute and chronic hepatitis. 3. A new ALP4 fraction appears, probably due to fibroblastic activity, in some histological types of cirrhosis. | Studies on alkaline phosphatase isoenzymes in hepatic diseases. Relation to gamma-glutamyltransferase. Isoenzymes of alkaline phosphatase (ALP) and total gamma-glutamyltransferase (gamma GT) have been studied in patients with increased total ALP. Fractionation of alkaline phosphatase yielded clinical information which could not be obtained by determination ALP and gamma GT alone. 1. There was a high degree of correlation between isoALP 1 (biliary band) and total gamma GT. 2. The ALP2 fraction increases after cytolysis in acute and chronic hepatitis. 3. A new ALP4 fraction appears, probably due to fibroblastic activity, in some histological types of cirrhosis. | [
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PMID:25730 | A new variant of methylmalonic acidemia-defective coenzyme-apoenzyme binding in cultured fibroblasts. | Cultured fibroblasts from a patient with methylmalonic acidemia, clinically responsive to vitamin B-12, were studied in vitro. Kinetic analysis revealed abnormal binding of the coenzyme, 5'-deoxyadenosylcobalamin, for its methylmalonyl-CoA carbonylmutase apoenzyme, i.e., KM of 3.8 X 10(-5) M versus control KM of 1.5 X 10(-8) M. These data are interpreted as indicating a structural defect of the apoenzyme at the coenzyme binding site, and represent another variant of this genetic disorder. | A new variant of methylmalonic acidemia-defective coenzyme-apoenzyme binding in cultured fibroblasts. Cultured fibroblasts from a patient with methylmalonic acidemia, clinically responsive to vitamin B-12, were studied in vitro. Kinetic analysis revealed abnormal binding of the coenzyme, 5'-deoxyadenosylcobalamin, for its methylmalonyl-CoA carbonylmutase apoenzyme, i.e., KM of 3.8 X 10(-5) M versus control KM of 1.5 X 10(-8) M. These data are interpreted as indicating a structural defect of the apoenzyme at the coenzyme binding site, and represent another variant of this genetic disorder. | [
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PMID:25731 | Immunoreactive properties of anti-thyroglobulin autoantibodies isolated by affinity chromatography from human thyroiditis serum. | A Sepharose-coupled 19S human thyroglobulin has been used as an immunoadsorbent to isolate anti-thyroglobulin autoantibodies and to evaluate the antigen-antibody interactions. With the system proposed a high yield of active antibody molecules was obtained. It is possible to evaluate both the soluble and precipitating 'immunological interactions', thus avoiding the use of the double antibody technique. | Immunoreactive properties of anti-thyroglobulin autoantibodies isolated by affinity chromatography from human thyroiditis serum. A Sepharose-coupled 19S human thyroglobulin has been used as an immunoadsorbent to isolate anti-thyroglobulin autoantibodies and to evaluate the antigen-antibody interactions. With the system proposed a high yield of active antibody molecules was obtained. It is possible to evaluate both the soluble and precipitating 'immunological interactions', thus avoiding the use of the double antibody technique. | [
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PMID:25732 | Increased biliary excretion of ouabain induced by bucolome in the rat. | 1. Following the intravenous injection of 3H-ouabain (0.4 or 0.6 mg/100 g body weight) the plasma concentration and biliary excretion of ouabain were compared for control male Wistar rats and rats given bucolome (BC, 1-cyclohexyl-5-n-butyl-2,4,6-trioxoperhydroxypyrimidine, 20 mg/100 g) 40 min before the ouabain injection. In bucolome treated rats, the bile flow rate was 80-90% higher than in control rats and the biliary excretion rate of ouabain for the 40 min post-injection period was significantly higher in bucolome treated rat groups. The increase was due to an approximately two-fold increase in the excretion rate in the first 10 min period. On the other hand, plasma concentration of ouabain was significantly higher in bucolome treated rats compared with control rats at corresponding time intervals. Plasma volume as determined by 131I-labelled albumin dilution was not decreased in bucolome treated rats. 2. The results indicated that the significant increase in biliary excretion of ouabain administration was due to the enhancement of the hepatic transport and/or biliary excretion process and not due to an increase in hepatic uptake. | Increased biliary excretion of ouabain induced by bucolome in the rat. 1. Following the intravenous injection of 3H-ouabain (0.4 or 0.6 mg/100 g body weight) the plasma concentration and biliary excretion of ouabain were compared for control male Wistar rats and rats given bucolome (BC, 1-cyclohexyl-5-n-butyl-2,4,6-trioxoperhydroxypyrimidine, 20 mg/100 g) 40 min before the ouabain injection. In bucolome treated rats, the bile flow rate was 80-90% higher than in control rats and the biliary excretion rate of ouabain for the 40 min post-injection period was significantly higher in bucolome treated rat groups. The increase was due to an approximately two-fold increase in the excretion rate in the first 10 min period. On the other hand, plasma concentration of ouabain was significantly higher in bucolome treated rats compared with control rats at corresponding time intervals. Plasma volume as determined by 131I-labelled albumin dilution was not decreased in bucolome treated rats. 2. The results indicated that the significant increase in biliary excretion of ouabain administration was due to the enhancement of the hepatic transport and/or biliary excretion process and not due to an increase in hepatic uptake. | [
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] |
PMID:25745 | Bullous papular urticaria. | A bullous type of papular urticaria is seen commonly in Iraq. The eruption can be extensive, simulating some of the more serious bullous skin diseases. This paper describes the condition clinically and histologically. | Bullous papular urticaria. A bullous type of papular urticaria is seen commonly in Iraq. The eruption can be extensive, simulating some of the more serious bullous skin diseases. This paper describes the condition clinically and histologically. | [
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PMID:25749 | Streptococcus pneumoniae isolates relatively insensitive to penicillin G recovered from patients in Switzerland. | The sensitivity to penicillin G of pneumococci isolated in Switzerland has been determined by the quantitative tube dilution method. 3 out of 100 strains were relatively insensitive to this antibiotic (minimum inhibitory concentration greater than 0.1 microgram/ml), thus confirming observations already made in other countries. These results underline the necessity of routinely testing the sensitivity of pneumococci to penicillin G. | Streptococcus pneumoniae isolates relatively insensitive to penicillin G recovered from patients in Switzerland. The sensitivity to penicillin G of pneumococci isolated in Switzerland has been determined by the quantitative tube dilution method. 3 out of 100 strains were relatively insensitive to this antibiotic (minimum inhibitory concentration greater than 0.1 microgram/ml), thus confirming observations already made in other countries. These results underline the necessity of routinely testing the sensitivity of pneumococci to penicillin G. | [
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PMID:25754 | [Surgery of pancreatic endocrine tumours in the German Federal Republic: results of a survey (author's transl)]. | Within a ten-year scan (1967-1976) 207 insulinomas, 50 gastrinomas, 8 Verner-Morrison tumors, 5 glucagonomas and 12 endocrine pancreatic tumours with associated MEA syndrome (multiple endocrine adenomatosis) were treated surgically at various university hospitals (information obtained by questionnaire). Half of the insulinomas were treated by enucleation, one third by resection of the tail of the pancreas. Total gastrectomy was the procedure of choice in 80% of patients with gastrinoma, but sometimes pancreatic resection to remove the tumour was added. An new therapeutic concept of using histamine-H2 receptor antagonists for treating patients with Zollinger-Ellison syndrome is discussed. In the eight patients with a Verner-Morrison syndrome removal of the tumour or distal pancreatic resection was the procedure of choice. | [Surgery of pancreatic endocrine tumours in the German Federal Republic: results of a survey (author's transl)]. Within a ten-year scan (1967-1976) 207 insulinomas, 50 gastrinomas, 8 Verner-Morrison tumors, 5 glucagonomas and 12 endocrine pancreatic tumours with associated MEA syndrome (multiple endocrine adenomatosis) were treated surgically at various university hospitals (information obtained by questionnaire). Half of the insulinomas were treated by enucleation, one third by resection of the tail of the pancreas. Total gastrectomy was the procedure of choice in 80% of patients with gastrinoma, but sometimes pancreatic resection to remove the tumour was added. An new therapeutic concept of using histamine-H2 receptor antagonists for treating patients with Zollinger-Ellison syndrome is discussed. In the eight patients with a Verner-Morrison syndrome removal of the tumour or distal pancreatic resection was the procedure of choice. | [
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PMID:25757 | Labetalol: a review of its pharmacology and therapeutic use in hypertension. | Labetalol is an orally active adrenoceptor blocking drug which is a competitive antagonist at both alpha- and beta-adrenoceptor sites. Its beta-blocking effects resemble those of propranolol, but its overall haemodynamic effects are akin to those of a comination of propranolol and an alpha-adrenoceptor blocking drugs such as phenoxybenzamine. Unlike with conventional beta-adrenoceptor blocking drugs, acute administration of labetalol reduces peripheral vascular resistance and blood pressure and has little effect on cardiac output. Theoretically, labetalol has advantages over beta-adrenoceptor blocking drugs alone in the treatment of hypertension, but any real advantage, particulary in mild or moderate hypertension, has yet to be conclusively demonstrated in therapeutic trials. Labetalol may be particularly useful in some patients whose blood pressure is not adequately controlled by beta-adrenoceptor blocking drugs alone or combined with a diuretic, but possibly at the expense of a postural hypotensive effect. Postural hypotension is the most troublesome side-effect, occasionally necessitating withdrawal of therapy, but severe side-effects such as are seen with effective antihypertensive dosages of phenoxybenzamine do not occur with labetalol. | Labetalol: a review of its pharmacology and therapeutic use in hypertension. Labetalol is an orally active adrenoceptor blocking drug which is a competitive antagonist at both alpha- and beta-adrenoceptor sites. Its beta-blocking effects resemble those of propranolol, but its overall haemodynamic effects are akin to those of a comination of propranolol and an alpha-adrenoceptor blocking drugs such as phenoxybenzamine. Unlike with conventional beta-adrenoceptor blocking drugs, acute administration of labetalol reduces peripheral vascular resistance and blood pressure and has little effect on cardiac output. Theoretically, labetalol has advantages over beta-adrenoceptor blocking drugs alone in the treatment of hypertension, but any real advantage, particulary in mild or moderate hypertension, has yet to be conclusively demonstrated in therapeutic trials. Labetalol may be particularly useful in some patients whose blood pressure is not adequately controlled by beta-adrenoceptor blocking drugs alone or combined with a diuretic, but possibly at the expense of a postural hypotensive effect. Postural hypotension is the most troublesome side-effect, occasionally necessitating withdrawal of therapy, but severe side-effects such as are seen with effective antihypertensive dosages of phenoxybenzamine do not occur with labetalol. | [
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PMID:25760 | [Tear resistance of laser-welded dental alloys]. | The investigation was undertaken to establish the place of lasers as tools in the dental technical laboratory. Tests were undertaken to study resistance to tears in laser welded dental metal alloys. (Degudent U, Degulor M of Fa. Degussa.) Availabel as laser apparatus were a cw Nd:YAG-laser (400 Watt capacity) and a pulse Nd:YAG-laser (max. 45 pulse energy, 9.2 pulse length). Welding tests on models with both lasers resulted in higher resistance to tears than was achievable by conventional soldering processes. Furthermore it could be shown that in certain alloy compositions, used in our experiments, welding by the cw process resulted in greater resistance to fissuring than by the pulse process. By adopting the alloy as well as the preparation of appliances to the laser process we feel that markedly superior results can be achieved as we describe in this first communication. | [Tear resistance of laser-welded dental alloys]. The investigation was undertaken to establish the place of lasers as tools in the dental technical laboratory. Tests were undertaken to study resistance to tears in laser welded dental metal alloys. (Degudent U, Degulor M of Fa. Degussa.) Availabel as laser apparatus were a cw Nd:YAG-laser (400 Watt capacity) and a pulse Nd:YAG-laser (max. 45 pulse energy, 9.2 pulse length). Welding tests on models with both lasers resulted in higher resistance to tears than was achievable by conventional soldering processes. Furthermore it could be shown that in certain alloy compositions, used in our experiments, welding by the cw process resulted in greater resistance to fissuring than by the pulse process. By adopting the alloy as well as the preparation of appliances to the laser process we feel that markedly superior results can be achieved as we describe in this first communication. | [
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PMID:25762 | Effects of subanesthetic concentrations of enflurane on rat pregnancy and early development. | Anesthetic pollutants in the operating room have been implicated in producing spontaneous abortion in exposed personnel and congenital malformations among their offspring. To test the effects of trace concentrations of enflurane on pregnancy, rats were exposed to two levels (10.7 and 63.7 ppm) of the anesthetic for 8 hr daily from days 1 to 19 of pregnancy. Litter sizes were not affected but birth weights of exposed offspring were slightly higher than controls. During lactation, cross-fostering studies were performed. Exposed offspring were housed with nonexposed mothers and vice versa to determine if exposure during pregnancy affected early development. Weights at 7, 14, and 21 days of age did not differ among the offspring in the lower dose experiment. Weights of the cross-fostered groups in the high dose experiment were decreased at day seven compared to controls. In the same experiment, exposed offspring housed with exposed mothers were heavier than controls on day 21 of lactation. The modest nature of these alterations suggests that enflurane has little or no gross effect on rat pregnancy and postnatal development. | Effects of subanesthetic concentrations of enflurane on rat pregnancy and early development. Anesthetic pollutants in the operating room have been implicated in producing spontaneous abortion in exposed personnel and congenital malformations among their offspring. To test the effects of trace concentrations of enflurane on pregnancy, rats were exposed to two levels (10.7 and 63.7 ppm) of the anesthetic for 8 hr daily from days 1 to 19 of pregnancy. Litter sizes were not affected but birth weights of exposed offspring were slightly higher than controls. During lactation, cross-fostering studies were performed. Exposed offspring were housed with nonexposed mothers and vice versa to determine if exposure during pregnancy affected early development. Weights at 7, 14, and 21 days of age did not differ among the offspring in the lower dose experiment. Weights of the cross-fostered groups in the high dose experiment were decreased at day seven compared to controls. In the same experiment, exposed offspring housed with exposed mothers were heavier than controls on day 21 of lactation. The modest nature of these alterations suggests that enflurane has little or no gross effect on rat pregnancy and postnatal development. | [
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PMID:25763 | Metabolism and toxicity of 2,2,2-trifluoroethyl vinyl ether. | A review on metabolism and toxicity of the fluorinated anesthetic agent, fluroxene, is presented. Fluroxene anesthesia is nontoxic to man but fatal to many experimental animals. The fluroxene molecule (2,2,2-trifluroethyl vinyl ether) is composed of two moieties; both are toxic as a result of their metabolism: the vinyl moiety destroys heme of cytochrome P-450 while being metabolized to the final product, CO2. The trifluoroethyl moiety is oxidized to trifluoroethanol (TFE) and trifluoroacetic acid (TFAA), and the acute toxicity of fluroxene is related to this pathway. The ratio of metabolities (TFAA to TFE) excreted by different species exposed to fluroxene varies; whenever highly toxic TFE is the major metabolite, fluroxene toxicity is high (rodents, dogs, phenobarbital pretreated monkeys), whenever TFAA is the major metabolite (man, monkey) fluroxene is not toxic. Toxicity in different species also correlates with the extent of glutathione depletion following fluroxene exposure. Fluroxene metabolism and toxicity are modified by drugs metabolized by or affecting the activity of the microsomal cytochrome P-450-system or enzymes involved in ethanol metabolism. The susceptibility of fluroxene to two enzymatic systems which are modified by environmental and genetic factors may explain the large differences in fluroxene toxicity to various species. The fate of one-third of fluroxene administered to man remains unknown. | Metabolism and toxicity of 2,2,2-trifluoroethyl vinyl ether. A review on metabolism and toxicity of the fluorinated anesthetic agent, fluroxene, is presented. Fluroxene anesthesia is nontoxic to man but fatal to many experimental animals. The fluroxene molecule (2,2,2-trifluroethyl vinyl ether) is composed of two moieties; both are toxic as a result of their metabolism: the vinyl moiety destroys heme of cytochrome P-450 while being metabolized to the final product, CO2. The trifluoroethyl moiety is oxidized to trifluoroethanol (TFE) and trifluoroacetic acid (TFAA), and the acute toxicity of fluroxene is related to this pathway. The ratio of metabolities (TFAA to TFE) excreted by different species exposed to fluroxene varies; whenever highly toxic TFE is the major metabolite, fluroxene toxicity is high (rodents, dogs, phenobarbital pretreated monkeys), whenever TFAA is the major metabolite (man, monkey) fluroxene is not toxic. Toxicity in different species also correlates with the extent of glutathione depletion following fluroxene exposure. Fluroxene metabolism and toxicity are modified by drugs metabolized by or affecting the activity of the microsomal cytochrome P-450-system or enzymes involved in ethanol metabolism. The susceptibility of fluroxene to two enzymatic systems which are modified by environmental and genetic factors may explain the large differences in fluroxene toxicity to various species. The fate of one-third of fluroxene administered to man remains unknown. | [
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PMID:25764 | A case of spermatic arteriovenous anastomosis in the horse. | A large anastomosis of the spermatic artery and vein is described. This was found while surgically removing an abdominal testis. Before surgery the animal wanted to rear after exercise and could not stand on 3 legs for any length of time while being shod. This unusual behaviour disappeared after removal of the mass. The performance and conformation of the horse has also greatly improved. | A case of spermatic arteriovenous anastomosis in the horse. A large anastomosis of the spermatic artery and vein is described. This was found while surgically removing an abdominal testis. Before surgery the animal wanted to rear after exercise and could not stand on 3 legs for any length of time while being shod. This unusual behaviour disappeared after removal of the mass. The performance and conformation of the horse has also greatly improved. | [
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PMID:25765 | Studies on the purification and properties of a 6.8-S DNA polymerase activity found in calf-thymus DNA polymerase-alpha fraction. | The heterogeneity of calf thymus DNA polymerase-alpha has been further investigated. In particular, an enzyme (enzyme D) which exhibits higher activity on poly(dA) . (dT)10 (A:T = 20:1) compared with that on activated DNA, has been further purified and its properties compared with two other activities of the DNA polymerase-alpha fraction (enzymes A1 and C) which do not show a preference for poly(dA) . (dT)10 over activated DNA. As with A1 and C, enzyme D was shown to have many of the characteristic properties of DNA polymerase-alpha in that it is an acidic protein as judged by its binding to DEAE-cellulose, has a molecular weight of about 140000, does not use a poly (A) . (dT)10 template-initiator complex and is inhibited by N-ethylmaleimide. It exhibits anomalous gel filtration behaviour on Sepharose 6B and it binds relatively weakly to DNA-cellulose compared with DNA polymerase-beta. The extreme sensitivity of enzyme D to inhibtion by N-ethylmaleimide distinguishes it from A1 and C, as does its elution position from a DEAE-cellulose column. On the other hand enzymes C and D are readily inactivated by heating at 45 degrees C unlike enzyme A1. The possible interrelationships of the multiple activities of calf thymus DNA polymerase-alpha are discussed. | Studies on the purification and properties of a 6.8-S DNA polymerase activity found in calf-thymus DNA polymerase-alpha fraction. The heterogeneity of calf thymus DNA polymerase-alpha has been further investigated. In particular, an enzyme (enzyme D) which exhibits higher activity on poly(dA) . (dT)10 (A:T = 20:1) compared with that on activated DNA, has been further purified and its properties compared with two other activities of the DNA polymerase-alpha fraction (enzymes A1 and C) which do not show a preference for poly(dA) . (dT)10 over activated DNA. As with A1 and C, enzyme D was shown to have many of the characteristic properties of DNA polymerase-alpha in that it is an acidic protein as judged by its binding to DEAE-cellulose, has a molecular weight of about 140000, does not use a poly (A) . (dT)10 template-initiator complex and is inhibited by N-ethylmaleimide. It exhibits anomalous gel filtration behaviour on Sepharose 6B and it binds relatively weakly to DNA-cellulose compared with DNA polymerase-beta. The extreme sensitivity of enzyme D to inhibtion by N-ethylmaleimide distinguishes it from A1 and C, as does its elution position from a DEAE-cellulose column. On the other hand enzymes C and D are readily inactivated by heating at 45 degrees C unlike enzyme A1. The possible interrelationships of the multiple activities of calf thymus DNA polymerase-alpha are discussed. | [
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PMID:25766 | Sulfate-mediated affinity chromatography on NADP+-Sepharose of glutamate dehydrogenase from halophilic bacteria and of glucose-6-phosphate dehydrogenase from Escherichia coli. | An improved synthesis of the 8-(6-aminohexyl)amino derivative of NADP+ is described for use in affinity chromatography. The binding of glutamate dehydrogenase isolated from halobacterium of the Dead Sea on a column of Sepharose linked to this NADP+ derivative could be drastically enhanced by addition of sulfate (1M) and provided a tool for partially purifying the enzyme from a crude extract. A similar finding is reported for glucose-6-phosphate dehydrogenase in crude extracts of Escherichia coli. The effects are shown to be biospecific, suggesting that the strength of the interaction between protein and immobilized coenzymes is a function of the sulfate concentration. | Sulfate-mediated affinity chromatography on NADP+-Sepharose of glutamate dehydrogenase from halophilic bacteria and of glucose-6-phosphate dehydrogenase from Escherichia coli. An improved synthesis of the 8-(6-aminohexyl)amino derivative of NADP+ is described for use in affinity chromatography. The binding of glutamate dehydrogenase isolated from halobacterium of the Dead Sea on a column of Sepharose linked to this NADP+ derivative could be drastically enhanced by addition of sulfate (1M) and provided a tool for partially purifying the enzyme from a crude extract. A similar finding is reported for glucose-6-phosphate dehydrogenase in crude extracts of Escherichia coli. The effects are shown to be biospecific, suggesting that the strength of the interaction between protein and immobilized coenzymes is a function of the sulfate concentration. | [
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PMID:25768 | Affinity labelling of the estrogen binding site of glutamate dehydrogenase with iodoacetyldiethylstilbestrol. Selective alkylation of cysteine-89. | Iodoacetyldiethylstilbestrol was used as an affinity label to alkylate the estrogen binding site of bovine liver glutamate dehydrogenase. This reagent induced inactivation and alkylation of the enzyme. The non-alkylating analogues diethylstilbestrol and estradiol protected the enzyme towards alkylation. The apparent constant of alkylation was of the order of magnitude of I50 for the allosteric inhibition by diethylstilbestrol. These two results suggest that alkylation occurred at the estrogen binding site. The stoichiometry of alkylation was between one and two, depending on the experimental conditions. When the stoichiometry was found to be less than or equal to 1, 90% of the label was bound on cystein residues, 70% of which was carried by cysteine-89, a cysteine residue which is known to be inacessible to iodoacetamide in phosphate buffer in the same conditions of temperature and pH. | Affinity labelling of the estrogen binding site of glutamate dehydrogenase with iodoacetyldiethylstilbestrol. Selective alkylation of cysteine-89. Iodoacetyldiethylstilbestrol was used as an affinity label to alkylate the estrogen binding site of bovine liver glutamate dehydrogenase. This reagent induced inactivation and alkylation of the enzyme. The non-alkylating analogues diethylstilbestrol and estradiol protected the enzyme towards alkylation. The apparent constant of alkylation was of the order of magnitude of I50 for the allosteric inhibition by diethylstilbestrol. These two results suggest that alkylation occurred at the estrogen binding site. The stoichiometry of alkylation was between one and two, depending on the experimental conditions. When the stoichiometry was found to be less than or equal to 1, 90% of the label was bound on cystein residues, 70% of which was carried by cysteine-89, a cysteine residue which is known to be inacessible to iodoacetamide in phosphate buffer in the same conditions of temperature and pH. | [
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PMID:25769 | Purification, biochemical and immunological characterisation of hexosaminidase A from variant AB of infantile GM2 gangliosidosis. | Variant AB of infantile GM2 gangliosidosis is a fatal disease leading invariably to death within the first few years of life, due to the excessive storage of the glycolipids GM2 and GA2 which occurs in the nervous tissue of the patient. Unlike other variants of this hereditary disease, where a deficiency of hexosaminidase A, the ganglioside-GM2-degrading enzyme, could be demonstrated, the variant AB is characterized by a normal or even elevated level of this enzyme. To examine the possibility of a mutant hexosaminidase A, well capable of hydrolyzing the fluorogenic synthetic substrates but unable to attack the ganglioside, the enzyme was isolated from a patients tissue and characterized biochemically and immunologically in comparison with an enzyme preparation from normal control tissue. No differences between hexosaminidase A from normal and variant AB tissue could be detected indicating that the defect involved in this disease is not at the genetic level of production of either alpha or beta chains of hexosaminidase A. | Purification, biochemical and immunological characterisation of hexosaminidase A from variant AB of infantile GM2 gangliosidosis. Variant AB of infantile GM2 gangliosidosis is a fatal disease leading invariably to death within the first few years of life, due to the excessive storage of the glycolipids GM2 and GA2 which occurs in the nervous tissue of the patient. Unlike other variants of this hereditary disease, where a deficiency of hexosaminidase A, the ganglioside-GM2-degrading enzyme, could be demonstrated, the variant AB is characterized by a normal or even elevated level of this enzyme. To examine the possibility of a mutant hexosaminidase A, well capable of hydrolyzing the fluorogenic synthetic substrates but unable to attack the ganglioside, the enzyme was isolated from a patients tissue and characterized biochemically and immunologically in comparison with an enzyme preparation from normal control tissue. No differences between hexosaminidase A from normal and variant AB tissue could be detected indicating that the defect involved in this disease is not at the genetic level of production of either alpha or beta chains of hexosaminidase A. | [
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PMID:25772 | Conversion of the active-site cysteine residue of papain into a dehydro-serine, a serine and a glycine residue. | Photolysis of papain which had been inhibited with 2-bromo-2',4'-dimethoxyacetophenone regenerated papain, but also formed [deltaSer25]-papain (i.e. papain in which the active-site cysteine residue 25 was replaced by dehydroserine) via the intermediate dehydrocysteine analogue, [deltaCys25]-papain. Reduction with sodium borohydride gave [Ser25]papain. Both [Ser25]papain and [deltaSer25]-papain had binding properties similar to those of papain, but were devoid of enzymic activity. Their fluorescence properties were also investigated. Incubation of [deltaSer25]papain at pH 9.0 gave [Gly25]papain. | Conversion of the active-site cysteine residue of papain into a dehydro-serine, a serine and a glycine residue. Photolysis of papain which had been inhibited with 2-bromo-2',4'-dimethoxyacetophenone regenerated papain, but also formed [deltaSer25]-papain (i.e. papain in which the active-site cysteine residue 25 was replaced by dehydroserine) via the intermediate dehydrocysteine analogue, [deltaCys25]-papain. Reduction with sodium borohydride gave [Ser25]papain. Both [Ser25]papain and [deltaSer25]-papain had binding properties similar to those of papain, but were devoid of enzymic activity. Their fluorescence properties were also investigated. Incubation of [deltaSer25]papain at pH 9.0 gave [Gly25]papain. | [
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PMID:25775 | Bovine lenticular gamma-glutamylcysteine synthetase: reaction sequence. | The sequence of substrate addition and product release during the reaction catalyzed by gamma-glutamylcysteine synthetase was investigated with purified enzyme from bovine lens. Thermal inactivation and kinetic studies suggest that L-glutamate is the first substrate to bind to the enzyme. L-beta-Chloroalanine was used as the L-cysteine analogue. Utilizing substrate activation and product inhibition studies, the following reaction sequence was determined: L-glutamate binding. ATP binding, ADP release, L-beta-chloroalanine binding, followed by inorganic phosphate and then dipeptide release. The implications of this mechanism with regard to control of the enzyme in situ and its importance in glutathione synthesis are discussed. | Bovine lenticular gamma-glutamylcysteine synthetase: reaction sequence. The sequence of substrate addition and product release during the reaction catalyzed by gamma-glutamylcysteine synthetase was investigated with purified enzyme from bovine lens. Thermal inactivation and kinetic studies suggest that L-glutamate is the first substrate to bind to the enzyme. L-beta-Chloroalanine was used as the L-cysteine analogue. Utilizing substrate activation and product inhibition studies, the following reaction sequence was determined: L-glutamate binding. ATP binding, ADP release, L-beta-chloroalanine binding, followed by inorganic phosphate and then dipeptide release. The implications of this mechanism with regard to control of the enzyme in situ and its importance in glutathione synthesis are discussed. | [
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PMID:25777 | Acid-base and gas tension of cerebrospinal fluid in Nigerians and tetanus patients. | The acid-base balance and gas tension of the cerebrospinal fluid of eight tetanus patients and twelve control subjects were studied. Tetanus patients had metabolic acidosis which was severely reflected in the cerebrospinal fluid. While the cerebrospinal fluid pH is lower than that of the arterial blood there was no difference between the acid-base and gas tension of the cerebrospinal fluid of Nigerians and the causasians. The severe metabolic acidosis of the cerebrospinal fluid of tetanus patients might be one of the causes of sudden deaths seen in these patients. | Acid-base and gas tension of cerebrospinal fluid in Nigerians and tetanus patients. The acid-base balance and gas tension of the cerebrospinal fluid of eight tetanus patients and twelve control subjects were studied. Tetanus patients had metabolic acidosis which was severely reflected in the cerebrospinal fluid. While the cerebrospinal fluid pH is lower than that of the arterial blood there was no difference between the acid-base and gas tension of the cerebrospinal fluid of Nigerians and the causasians. The severe metabolic acidosis of the cerebrospinal fluid of tetanus patients might be one of the causes of sudden deaths seen in these patients. | [
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PMID:25778 | Stereoselective interaction of tetrahydroisoquinolines in beta-adrenoceptor systems. | In selected beta1- (heart, lipolysis) and beta2-adrenoceptor (trachea) systems, the interaction of racemic-trimetoquinol (TMQ) and the erythro- and threo-diastereomers of 1-(3',4',5'-trimethoxy-alpha-hydroxybenzyl)-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (alpha-hydroxy TMQ) was investigated. Each tetrahydroisoquinoline possessed agonist activity in these beta-adrenoceptor systems. The rank order of potency observed for these compounds was racemic-TMQ greater than erythro-alpha-hydroxy TMQ greater than threo-alpha-hydroxy TMQ. Using isolated fat adipocytes, a favorable correlation was observed between the elevation in c-AMP and pharmacological response for the TMQ stereoisomers and diastereomers of alpha-hydroxy TMQ. The rise in intracellular c-AMP produced by (-)- and (+)-TMQ in fat cells was blocked by the presence of propranolol, and not in the presence of phentolamine. Since considerably higher concentrations (greater 10(-4) M) of these compounds were required to produce a significant inhibition of c-AMP phosphodiesterase activity in adipose tissue, it is proposed that the lipolytic response is a result of stereoselective interaction of these tetrahydroisoquinolines at the level of membrane-bound adenylate cyclase. | Stereoselective interaction of tetrahydroisoquinolines in beta-adrenoceptor systems. In selected beta1- (heart, lipolysis) and beta2-adrenoceptor (trachea) systems, the interaction of racemic-trimetoquinol (TMQ) and the erythro- and threo-diastereomers of 1-(3',4',5'-trimethoxy-alpha-hydroxybenzyl)-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (alpha-hydroxy TMQ) was investigated. Each tetrahydroisoquinoline possessed agonist activity in these beta-adrenoceptor systems. The rank order of potency observed for these compounds was racemic-TMQ greater than erythro-alpha-hydroxy TMQ greater than threo-alpha-hydroxy TMQ. Using isolated fat adipocytes, a favorable correlation was observed between the elevation in c-AMP and pharmacological response for the TMQ stereoisomers and diastereomers of alpha-hydroxy TMQ. The rise in intracellular c-AMP produced by (-)- and (+)-TMQ in fat cells was blocked by the presence of propranolol, and not in the presence of phentolamine. Since considerably higher concentrations (greater 10(-4) M) of these compounds were required to produce a significant inhibition of c-AMP phosphodiesterase activity in adipose tissue, it is proposed that the lipolytic response is a result of stereoselective interaction of these tetrahydroisoquinolines at the level of membrane-bound adenylate cyclase. | [
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PMID:25779 | Effect of progesterone on adrenoceptors in the isthmus of the rabbit oviduct. | The effect of adrenergic agonists on the contractility of circular muscle of the isthmus of the oviduct was studied in isolated tissues from rabbits in estrus and after progesterone pretreatment. alpha-Adrenoceptor sensitivity was not altered by progesterone, and the order of potencies of alpha-agonists was similar to that for alpha-adrenoceptors in other rabbit tissues. Progesterone pretreatment increased the maximal inhibitory effect of isoprenaline on beta-adrenoceptors, but did not alter sensitivity to the agonist, suggesting that there had been an increase in the number of beta-adrenoceptors rather than a change in their affinity. The order of potencies of beta-agonists was similar to that for the beta1-adrenoceptor in other rabbit tissues. | Effect of progesterone on adrenoceptors in the isthmus of the rabbit oviduct. The effect of adrenergic agonists on the contractility of circular muscle of the isthmus of the oviduct was studied in isolated tissues from rabbits in estrus and after progesterone pretreatment. alpha-Adrenoceptor sensitivity was not altered by progesterone, and the order of potencies of alpha-agonists was similar to that for alpha-adrenoceptors in other rabbit tissues. Progesterone pretreatment increased the maximal inhibitory effect of isoprenaline on beta-adrenoceptors, but did not alter sensitivity to the agonist, suggesting that there had been an increase in the number of beta-adrenoceptors rather than a change in their affinity. The order of potencies of beta-agonists was similar to that for the beta1-adrenoceptor in other rabbit tissues. | [
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PMID:25782 | Does cytoplasmic alkalinization trigger mitochondrial energy dissipation in the brown adipocyte? | Indirect calorimetry measurements showed that brown fat thermogenesis was very sensitive to modifications of intra-cellular pH induced by extracellular acid-base perturbations. Specific blockage of active Na-K transport by ouabain inhibited the thermogenic response only in acidosis and more efficiently when the glycoside was administered before the catecholamine stimulus than when it was added after the full calorigenic response had developed. It is suggested that the catecholamine stimulus might initiate a positive feed-back alkalinization of the cytoplasm, concomitant with activation of Na-K transport. | Does cytoplasmic alkalinization trigger mitochondrial energy dissipation in the brown adipocyte? Indirect calorimetry measurements showed that brown fat thermogenesis was very sensitive to modifications of intra-cellular pH induced by extracellular acid-base perturbations. Specific blockage of active Na-K transport by ouabain inhibited the thermogenic response only in acidosis and more efficiently when the glycoside was administered before the catecholamine stimulus than when it was added after the full calorigenic response had developed. It is suggested that the catecholamine stimulus might initiate a positive feed-back alkalinization of the cytoplasm, concomitant with activation of Na-K transport. | [
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PMID:25783 | Control of non-shivering thermogenesis in a hibernator. | Present experiments indicate that in hedgehogs two different control mechanisms of non-shivering thermogenesis (NST) exist. During arousal from hibernation catecholamines control heat production in the interscapular brown adipose tissue. In a non-hibernating state, cold-induced NST is controlled by a desoxycorticosterone-like acting compound. The effector system of this second mode of NST is obviously not the interscapular brown fat but a layer of brown adipose tissue which covers the whole back of the hedgehog. | Control of non-shivering thermogenesis in a hibernator. Present experiments indicate that in hedgehogs two different control mechanisms of non-shivering thermogenesis (NST) exist. During arousal from hibernation catecholamines control heat production in the interscapular brown adipose tissue. In a non-hibernating state, cold-induced NST is controlled by a desoxycorticosterone-like acting compound. The effector system of this second mode of NST is obviously not the interscapular brown fat but a layer of brown adipose tissue which covers the whole back of the hedgehog. | [
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PMID:25784 | The "second messenger" system in brown adipose tissue of developing rats. Its molecular composition and mechanism of function. | Our studies of the hormonal receptor system and of the sequence of enzymatic events interconnecting the initial hormonal stimulus to the brown adipocyte with its final subcellular effect are summarized here. The hormone-mediated regulatory pathway consists of the adenyl cyclase and the protein kinase systems; the former is composed of the receptor and catalytic sites, the latter of regulatory and catalytic subunits. Emphasis is given currently to the diversity and characteristics of the individual components of the protein kinase system, since it seems to carry out the ultimate unifying mechanism involved in a variety of hormone-mediated functions, i.e. the phosphorylation of a protein molecule. | The "second messenger" system in brown adipose tissue of developing rats. Its molecular composition and mechanism of function. Our studies of the hormonal receptor system and of the sequence of enzymatic events interconnecting the initial hormonal stimulus to the brown adipocyte with its final subcellular effect are summarized here. The hormone-mediated regulatory pathway consists of the adenyl cyclase and the protein kinase systems; the former is composed of the receptor and catalytic sites, the latter of regulatory and catalytic subunits. Emphasis is given currently to the diversity and characteristics of the individual components of the protein kinase system, since it seems to carry out the ultimate unifying mechanism involved in a variety of hormone-mediated functions, i.e. the phosphorylation of a protein molecule. | [
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PMID:25790 | [Analysis of the mechanism of action of carbonic acid on tissue chemoreceptors]. | Perfusion of the small intestine of anesthetized cats with a solution imitating metabolic acidosis (pH = 7.3; [HCO-3] = =20.2 mM; PCO2 = 38 mm Hg) produced a threshold reflex increase in the blood pressure. The subsequent decrease of [HCO-3] to 3.2 mM and pH to 6.5 evoked a gradual raise of the blood pressure followed by a sharp increase of pressor reflexes amplitude within the range of pH 6.5--6.3. Solutions imitating metabolic acidosis (pH = 7.1; [HCO-3] = 12.7 mM) were found to increase the concentration of H+ ions in the outflow perfusate and blood pressure to larger extent than solutions imitating respiratory acidosis (pH = 7.1; PCO2 = 75 mm Hg). If the solution pH was held constantly at 7.4 by simultaneous decreasing PCO2 and [HCO-3] by a factor of two, a reflex increase in the blood pressure and decrease of perfusate pH had no effect either on blood pressure or perfusate pH. The data obtained suggest that one of the primary determinants of different responses of the tissue chemoreceptors to CO2 is the interstitial pH. | [Analysis of the mechanism of action of carbonic acid on tissue chemoreceptors]. Perfusion of the small intestine of anesthetized cats with a solution imitating metabolic acidosis (pH = 7.3; [HCO-3] = =20.2 mM; PCO2 = 38 mm Hg) produced a threshold reflex increase in the blood pressure. The subsequent decrease of [HCO-3] to 3.2 mM and pH to 6.5 evoked a gradual raise of the blood pressure followed by a sharp increase of pressor reflexes amplitude within the range of pH 6.5--6.3. Solutions imitating metabolic acidosis (pH = 7.1; [HCO-3] = 12.7 mM) were found to increase the concentration of H+ ions in the outflow perfusate and blood pressure to larger extent than solutions imitating respiratory acidosis (pH = 7.1; PCO2 = 75 mm Hg). If the solution pH was held constantly at 7.4 by simultaneous decreasing PCO2 and [HCO-3] by a factor of two, a reflex increase in the blood pressure and decrease of perfusate pH had no effect either on blood pressure or perfusate pH. The data obtained suggest that one of the primary determinants of different responses of the tissue chemoreceptors to CO2 is the interstitial pH. | [
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PMID:25791 | [Excretory function of the kidney after denervation and the administration of a beta-blockader]. | Osmotic diuresis (15% mannitol, 4.5 ml/hr) was in duced in anesthetized rats. At the end of each of 10 consecutive 10-min clearance periods the following parameters were determined: diuresis, sodium, chlorine and osmotic excretion, GFR (inulin clearance). The animals were divided into three groups: a) controls, b) with bilateral renal denervation (performed one week earlier) and c) with application of beta-adrenergic blocking agent propranolol (Obsidan, Germed DDR) introduced intravenously 0.1 mg/100 g initially and 0.12 mg/100 g sustaining dose during 2 hrs. The experimental results showed an increased sodium excretion in denervated and obsidan--treated animals with no change of the total excreted osmotically active substances. In denervated animals the chlorine excretion was increased as well. The data suggest that, in osmotic diuresis, the renal denervation and beta-adrenergic blocking agents inhibit the tubular sodium transport. The kidney osmoregulatory functions remains unchanged. | [Excretory function of the kidney after denervation and the administration of a beta-blockader]. Osmotic diuresis (15% mannitol, 4.5 ml/hr) was in duced in anesthetized rats. At the end of each of 10 consecutive 10-min clearance periods the following parameters were determined: diuresis, sodium, chlorine and osmotic excretion, GFR (inulin clearance). The animals were divided into three groups: a) controls, b) with bilateral renal denervation (performed one week earlier) and c) with application of beta-adrenergic blocking agent propranolol (Obsidan, Germed DDR) introduced intravenously 0.1 mg/100 g initially and 0.12 mg/100 g sustaining dose during 2 hrs. The experimental results showed an increased sodium excretion in denervated and obsidan--treated animals with no change of the total excreted osmotically active substances. In denervated animals the chlorine excretion was increased as well. The data suggest that, in osmotic diuresis, the renal denervation and beta-adrenergic blocking agents inhibit the tubular sodium transport. The kidney osmoregulatory functions remains unchanged. | [
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PMID:25799 | Rapid assays of urinary estriol in pregnant women. | Two devices designed for rapid assay of urinary estriol, the E3 KIT and E3 HAIR KIT, were evaluated using urine samples taken from pregnant women. Additionally, the clinical application of these devices in pregnancy management was examined. Correlations were high between an established method and the E3 KIT method (r = 0.819, p less than 0.001) and between the E3 HAIR KIT method and the E3 KIT method ( r = 0.936, p less than 0.01). E3 HAIR KIT assays showing E3 values of less than 20 microgram/ml (positive at 100-fold dilution of the urine) after the 36th week of pregnancy suggested fetoplacental dysfunction and indicated that more detailed tests were required. The E3 KIT, which provided rapid quantitative assay of urinary estriol, was capable of measuring 10 samples in approximately 3 hours. The E3 HAIR KIT provided semiquantitative assays of 10 samples in 2 hours. The speed, simplicity, and accuracy of the E3 HAIR KIT indicates its high clinical value as a prospective large-scale screening method for fetoplacental function. | Rapid assays of urinary estriol in pregnant women. Two devices designed for rapid assay of urinary estriol, the E3 KIT and E3 HAIR KIT, were evaluated using urine samples taken from pregnant women. Additionally, the clinical application of these devices in pregnancy management was examined. Correlations were high between an established method and the E3 KIT method (r = 0.819, p less than 0.001) and between the E3 HAIR KIT method and the E3 KIT method ( r = 0.936, p less than 0.01). E3 HAIR KIT assays showing E3 values of less than 20 microgram/ml (positive at 100-fold dilution of the urine) after the 36th week of pregnancy suggested fetoplacental dysfunction and indicated that more detailed tests were required. The E3 KIT, which provided rapid quantitative assay of urinary estriol, was capable of measuring 10 samples in approximately 3 hours. The E3 HAIR KIT provided semiquantitative assays of 10 samples in 2 hours. The speed, simplicity, and accuracy of the E3 HAIR KIT indicates its high clinical value as a prospective large-scale screening method for fetoplacental function. | [
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PMID:25800 | Total serum cholesterol, triglycerides and phospholipids during the normal menstrual cycle. | Ten healthy women (mean age, 29 years) with regular menstrual cycles of 26 to 29 days were tested for levels of total serum cholesterol, triglycerides, phospholipids, and estradiol three times during one menstrual cycle-during menstruation, at ovulation, and in the luteal phase. All studies were performed simultaneously. Lipid variations during the menstrual cycle were minimal. Total serum cholesterol, triglycerides, and phospholipids did not correlate with changes in the serum estradiol levels. | Total serum cholesterol, triglycerides and phospholipids during the normal menstrual cycle. Ten healthy women (mean age, 29 years) with regular menstrual cycles of 26 to 29 days were tested for levels of total serum cholesterol, triglycerides, phospholipids, and estradiol three times during one menstrual cycle-during menstruation, at ovulation, and in the luteal phase. All studies were performed simultaneously. Lipid variations during the menstrual cycle were minimal. Total serum cholesterol, triglycerides, and phospholipids did not correlate with changes in the serum estradiol levels. | [
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PMID:25801 | Toxoplasma antibodies and spontaneous abortion. | One hundred and fifty-two women with spontaneous abortion were investigated by hemagglutination (HA) and immunofluorescence antibody (IFA) tests for toxoplasmosis. In 48 cases, quantitive immunoglobulin (Ig) studies and mouse inoculation with gestational material were performed. Positive toxoplasma antibody titers were observed in 62 cases (40.8%) using HA and in 52 cases (38.2%) using IFA. This prevalence was significantly higher than that observed in 80 normal women who served as controls. Toxoplasma gondii was isolated in two cases. No correlation was found between antibody titers and IgG, IgM or IgA levels. We conclude that toxoplasmosis should be considered as the cause of abortion when a patient's antibody titer exceeds 1:256. | Toxoplasma antibodies and spontaneous abortion. One hundred and fifty-two women with spontaneous abortion were investigated by hemagglutination (HA) and immunofluorescence antibody (IFA) tests for toxoplasmosis. In 48 cases, quantitive immunoglobulin (Ig) studies and mouse inoculation with gestational material were performed. Positive toxoplasma antibody titers were observed in 62 cases (40.8%) using HA and in 52 cases (38.2%) using IFA. This prevalence was significantly higher than that observed in 80 normal women who served as controls. Toxoplasma gondii was isolated in two cases. No correlation was found between antibody titers and IgG, IgM or IgA levels. We conclude that toxoplasmosis should be considered as the cause of abortion when a patient's antibody titer exceeds 1:256. | [
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PMID:25802 | Training: an integral adjunct to the introduction of newer methods of fertility regulation. | The provision of new technologies of fertility control that are known to be safer, simpler, and more effective may at first result in higher complication rates, particularly if training in the new techniques is inadequate. This was illustrated by analysis of data on several fertility control methods collected by the International Fertility Research Program. Various studies showed significantly higher complication rates earlier in the series than later, including one study in which complication rates fell dramatically after clinical training was provided. Another study showed the highest complication rate among the physicians performing the fewer number of cases. Finally, one analysis documented greater variability in several clinical criteria among the participating physicians than between the two pieces of equipment being compared. These data document that it is essential to train physicians and other staff members in the proper use of new equipment and techniques if the potential improvements offered by new technologies in fertility regulation are to be realized. | Training: an integral adjunct to the introduction of newer methods of fertility regulation. The provision of new technologies of fertility control that are known to be safer, simpler, and more effective may at first result in higher complication rates, particularly if training in the new techniques is inadequate. This was illustrated by analysis of data on several fertility control methods collected by the International Fertility Research Program. Various studies showed significantly higher complication rates earlier in the series than later, including one study in which complication rates fell dramatically after clinical training was provided. Another study showed the highest complication rate among the physicians performing the fewer number of cases. Finally, one analysis documented greater variability in several clinical criteria among the participating physicians than between the two pieces of equipment being compared. These data document that it is essential to train physicians and other staff members in the proper use of new equipment and techniques if the potential improvements offered by new technologies in fertility regulation are to be realized. | [
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PMID:25803 | Laparoscopy for the confirmation and prognostic evaluation of pelvic inflammatory disease. | A presumptive diagnosis of pelvic inflammatory disease (PID) is usually made in our gynecologic clinics when obscure, acute lower abdominal pain is accompained by fever and abnormal vaginal discharge, urinary and rectal discomfort, marked tenderness of the pelvic organs to palpation, or pelvic masses. In the present study, during a 2-year period, 223 women underwent laparoscopy to confirm this diagnosis. PID was confirmed in 103 (46.2%) of the cases; other serious conditions were diagnosed in 69 (30.9%) of the cases; and no evidence of disease was found in 51 (22.9%) of the cases. The authors conclude that laparoscopy is a valuable tool in the diagnosis of PID. | Laparoscopy for the confirmation and prognostic evaluation of pelvic inflammatory disease. A presumptive diagnosis of pelvic inflammatory disease (PID) is usually made in our gynecologic clinics when obscure, acute lower abdominal pain is accompained by fever and abnormal vaginal discharge, urinary and rectal discomfort, marked tenderness of the pelvic organs to palpation, or pelvic masses. In the present study, during a 2-year period, 223 women underwent laparoscopy to confirm this diagnosis. PID was confirmed in 103 (46.2%) of the cases; other serious conditions were diagnosed in 69 (30.9%) of the cases; and no evidence of disease was found in 51 (22.9%) of the cases. The authors conclude that laparoscopy is a valuable tool in the diagnosis of PID. | [
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PMID:25804 | Difficult obstetric vesicovaginal fistula: a report on 12 cases. | In each of the 12 cases presented, the fistula was the result of obstructed labor. Common features to each case were: (a) a large retropubic defect involving the anterior vaginal wall, bladder and urethra, (b) total or partial urethral rupture, and (c) marked vaginal wall scarring with vaginal stenosis. Primary repair was performed by the vaginal route, and two patients were cured by the first operation. Six patients required two or more vaginal procedures for successful closure. Following repeated failure of vaginal closure, two patients had a successful transvesical closure and two require ureterosigmoidostomy. | Difficult obstetric vesicovaginal fistula: a report on 12 cases. In each of the 12 cases presented, the fistula was the result of obstructed labor. Common features to each case were: (a) a large retropubic defect involving the anterior vaginal wall, bladder and urethra, (b) total or partial urethral rupture, and (c) marked vaginal wall scarring with vaginal stenosis. Primary repair was performed by the vaginal route, and two patients were cured by the first operation. Six patients required two or more vaginal procedures for successful closure. Following repeated failure of vaginal closure, two patients had a successful transvesical closure and two require ureterosigmoidostomy. | [
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PMID:25805 | The successful treatment of a case of primary sterility resulting from Fredrickson's Type V hyperlipemia and panhypopituitarism. | Successful treatment of primary sterility in a woman having the rare association of panhypopituitarism with Fredrickson's Type V hyperlipemia is described. Replacement therapy with l-thyroxine, prednisone and a low fat diet cleared the patient's blood of the excessive chylomicrons and very low density lipoproteins. Ovulation was induced with human gonadotrophins, and triplets (two normal girls and a boy) were born. | The successful treatment of a case of primary sterility resulting from Fredrickson's Type V hyperlipemia and panhypopituitarism. Successful treatment of primary sterility in a woman having the rare association of panhypopituitarism with Fredrickson's Type V hyperlipemia is described. Replacement therapy with l-thyroxine, prednisone and a low fat diet cleared the patient's blood of the excessive chylomicrons and very low density lipoproteins. Ovulation was induced with human gonadotrophins, and triplets (two normal girls and a boy) were born. | [
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PMID:25806 | Progesterone metabolism in cultured amniotic fluid cells. | Amniotic fluid cells obtained by amnicentesis at 16-20 weeks' gestation were grown in culture until a confluent monolayer of cell had been formed. Radiolabeled pregnenolone, progesterone and 20 alpha-dihydroprogesterone were added to the cell cultures; steroid metabolites which formed after 24 and 48 hours of incubation were identified. Incubation of the cell cultures with pregnenolone-3H resulted in the formation of progesterone, 17alpha-progesterone and 20 alpha-dihydroprogesterone. A significant amount of progesterone was identified after incubating the cell cultures with 20 alpha-dihydroprogesterone. The results indicate that 3 beta-ol-dehydrogenase, 17 alpha-hydroxylase and 20 alpha-hydroxysteroid dehydrogenase enzymes are present in cultured amniotic fluid cells obtained at 16-20 weeks' gestation. | Progesterone metabolism in cultured amniotic fluid cells. Amniotic fluid cells obtained by amnicentesis at 16-20 weeks' gestation were grown in culture until a confluent monolayer of cell had been formed. Radiolabeled pregnenolone, progesterone and 20 alpha-dihydroprogesterone were added to the cell cultures; steroid metabolites which formed after 24 and 48 hours of incubation were identified. Incubation of the cell cultures with pregnenolone-3H resulted in the formation of progesterone, 17alpha-progesterone and 20 alpha-dihydroprogesterone. A significant amount of progesterone was identified after incubating the cell cultures with 20 alpha-dihydroprogesterone. The results indicate that 3 beta-ol-dehydrogenase, 17 alpha-hydroxylase and 20 alpha-hydroxysteroid dehydrogenase enzymes are present in cultured amniotic fluid cells obtained at 16-20 weeks' gestation. | [
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PMID:25807 | Clostridial sepsis after abortion with PGF2alpha and intracervical laminaria tents--a case report. | A case of clostridial endomyometritis and sepsis necessitating total abdominal hysterectomy which occurred 12 hours following abortion induced with intraamniotic administration of prostaglandin F2 alpha and laminaria tent insertion is discussed. Cultures from cervical, blood, and surgical specimens all yielded Clostridium perfringens. Intrauterine contamination with this microorganism most likely followed the insertion of laminaria tents through the cervical os, which was colonized with C. perfringens. Since C. perfringens may be present in the microflora of the lower female genital tract, great care must be taken to cleanse this area prior to intracervical laminaria tent insertion. | Clostridial sepsis after abortion with PGF2alpha and intracervical laminaria tents--a case report. A case of clostridial endomyometritis and sepsis necessitating total abdominal hysterectomy which occurred 12 hours following abortion induced with intraamniotic administration of prostaglandin F2 alpha and laminaria tent insertion is discussed. Cultures from cervical, blood, and surgical specimens all yielded Clostridium perfringens. Intrauterine contamination with this microorganism most likely followed the insertion of laminaria tents through the cervical os, which was colonized with C. perfringens. Since C. perfringens may be present in the microflora of the lower female genital tract, great care must be taken to cleanse this area prior to intracervical laminaria tent insertion. | [
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PMID:25808 | Experience with minilaparotomy in the Philippines. | This paper presents the socio-demographic characteristics, medical histories, and clinical data on 651 women sterilized by interval minilaparotomy procedures in Manila, Philippines. About two thirds of the procedures were performed with local anesthesia; the Pomeroy technique was used for tubal ligation. In 2.8% of the patients, salpingectomy or fimbriectomy was performed on one side because of surgical difficulties and complications. Surgical difficulties were encountered in 19.8% of the procedures; adhesions (4.3%) and bowel interference (4.0%) were the most frequent causes of surgical difficulty. Complications occurred during surgery in 1.7% of the procedures. Early postoperative complications were noted in 9.1% of the cases. None of the patients required readmission to the hospital. While 612 women were followed up at 6 months, 299 were followed up at 12 months. One women (0.2%) became pregnant after sterilization; at repeat minilaparotomy, ligation of the left round ligament rather than the tube was observed. Pelvic surgery, other than pregnancy-related surgery, during the year following sterilization was reported for one patient who underwent exploratory laparotomy with appendectomy and oophorocystectomy. Menstrual pattern changes were minimal. The results of this study suggest that tubal ligation via minilaparotomy is practical, safe, and effective. | Experience with minilaparotomy in the Philippines. This paper presents the socio-demographic characteristics, medical histories, and clinical data on 651 women sterilized by interval minilaparotomy procedures in Manila, Philippines. About two thirds of the procedures were performed with local anesthesia; the Pomeroy technique was used for tubal ligation. In 2.8% of the patients, salpingectomy or fimbriectomy was performed on one side because of surgical difficulties and complications. Surgical difficulties were encountered in 19.8% of the procedures; adhesions (4.3%) and bowel interference (4.0%) were the most frequent causes of surgical difficulty. Complications occurred during surgery in 1.7% of the procedures. Early postoperative complications were noted in 9.1% of the cases. None of the patients required readmission to the hospital. While 612 women were followed up at 6 months, 299 were followed up at 12 months. One women (0.2%) became pregnant after sterilization; at repeat minilaparotomy, ligation of the left round ligament rather than the tube was observed. Pelvic surgery, other than pregnancy-related surgery, during the year following sterilization was reported for one patient who underwent exploratory laparotomy with appendectomy and oophorocystectomy. Menstrual pattern changes were minimal. The results of this study suggest that tubal ligation via minilaparotomy is practical, safe, and effective. | [
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PMID:25810 | The potential reduction of medical complications from induced abortion. | Reducing medical complications resulting from induced abortion by identifying the safest and most appropriate procedures(s) for each gestational age is the purpose of this study. Data on all women who had induced abortions at all hospitals in the State of Hawaii where such procedures were performed between March 11, 1970, when the new abortion law went into effect, and June 30, 1974 were analyzed. Study findings show that if the abortion procedure with the least risk of complications at each length of gestation were selected a reduction in the complication rate of nearly 30% could result. | The potential reduction of medical complications from induced abortion. Reducing medical complications resulting from induced abortion by identifying the safest and most appropriate procedures(s) for each gestational age is the purpose of this study. Data on all women who had induced abortions at all hospitals in the State of Hawaii where such procedures were performed between March 11, 1970, when the new abortion law went into effect, and June 30, 1974 were analyzed. Study findings show that if the abortion procedure with the least risk of complications at each length of gestation were selected a reduction in the complication rate of nearly 30% could result. | [
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PMID:25811 | Some demographic aspects of pregnancy histories of sterilized women in the Mission Hospitals of Karnataka. | This study deals with the pregnancy histories of 534 women whow were sterilized in the Mission Hospitals in Karnataka State (India) during 1974 and 1975. Fertility differentials prevailing in various sociocultural groups are indicated. The study highlights the prevalence of adolescent sterility and also emphasizes the need for spacing pregnancies to avoid fetal wastage. The differentials in the sex ratio at each birth order are described. the need for further investigation in this field of demography is emphasized. | Some demographic aspects of pregnancy histories of sterilized women in the Mission Hospitals of Karnataka. This study deals with the pregnancy histories of 534 women whow were sterilized in the Mission Hospitals in Karnataka State (India) during 1974 and 1975. Fertility differentials prevailing in various sociocultural groups are indicated. The study highlights the prevalence of adolescent sterility and also emphasizes the need for spacing pregnancies to avoid fetal wastage. The differentials in the sex ratio at each birth order are described. the need for further investigation in this field of demography is emphasized. | [
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] |
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