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PMID:18144 | Proton translocation coupled to electron flow from endogenous substrates to fumarate in anaerobically grown Escherichia coli K12. | Observed leads to H+/2e- values for proton translocation during the reduction of fumarate by endogenous substrates in anaerobic cells of Escherichia coli K12 varied with fumarate concentration. This variation was probably due mainly to incomplete fumarate utilization. Under optimum conditions a minimum value for leads to H+/2e- of 1.04+/-0.20 was obtained. | Proton translocation coupled to electron flow from endogenous substrates to fumarate in anaerobically grown Escherichia coli K12. Observed leads to H+/2e- values for proton translocation during the reduction of fumarate by endogenous substrates in anaerobic cells of Escherichia coli K12 varied with fumarate concentration. This variation was probably due mainly to incomplete fumarate utilization. Under optimum conditions a minimum value for leads to H+/2e- of 1.04+/-0.20 was obtained. | [
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PMID:18145 | Effects of starvation and development on mitochondrial acetoacetyl-coenzyme A thiolase of rat liver. | The activity of the putative ketogenic beta-oxoacyl-CoA thiolase from mitochondria of rat liver increases with starvation, during neonatal life, and after the injection of glucagon. These changes are associated with alteration in ketonaemia. The changes in activities of this species of thiolase are not associated with significant alterations in the apparent affinity (Km) for the ketogenic substrate, acetyl-CoA. These results support a role for thiolase in the regulation of ketogenesis. | Effects of starvation and development on mitochondrial acetoacetyl-coenzyme A thiolase of rat liver. The activity of the putative ketogenic beta-oxoacyl-CoA thiolase from mitochondria of rat liver increases with starvation, during neonatal life, and after the injection of glucagon. These changes are associated with alteration in ketonaemia. The changes in activities of this species of thiolase are not associated with significant alterations in the apparent affinity (Km) for the ketogenic substrate, acetyl-CoA. These results support a role for thiolase in the regulation of ketogenesis. | [
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PMID:18146 | Guanylate cyclase activity and cyclic nucleotide concentrations during liver regeneration after experimental injury. | Cyclic nucleotide concentrations and guanylate cyclase activity were measured in regenerating rat liver. Previous work has shown that in livers of partially hepatectomized rats the activity of a membrane-bound guanylate cyclase increases considerably during the early replicative phase [Kimura & Murad (1975) Proc. Natl. Acad. Sci. U.S.A.72, 1965-1969; Goridis & Reutter (1975) Nature (London) 257, 698-700]. Over the same time period after partial hepatectomy, increased tissue concentrations of cyclic GMP were found when the rats were killed under pentobarbital anaesthesia, but not when anaesthesia was omitted. The results obtained on hepatectomized livers were compared with the changes in guanylate cyclase activity and cyclic nucleotide concentrations during the response to galactosamine treatment. Here, a peak of guanylate cyclase activity and of cyclic GMP concentrations occurred at 8h, that is before the beginning of the proliferative response. Both parameters were normal at the time of increased DNA synthesis. There does not, therefore, seem to be a consistent correlation between changes in guanylate cyclase activity or concentrations of cyclic GMP and an increase in liver DNA synthesis. A modest rise in cyclic AMP concentrations was found, however, in livers of galactosamine-treated rats, which was coincident with the time of DNA synthesis. | Guanylate cyclase activity and cyclic nucleotide concentrations during liver regeneration after experimental injury. Cyclic nucleotide concentrations and guanylate cyclase activity were measured in regenerating rat liver. Previous work has shown that in livers of partially hepatectomized rats the activity of a membrane-bound guanylate cyclase increases considerably during the early replicative phase [Kimura & Murad (1975) Proc. Natl. Acad. Sci. U.S.A.72, 1965-1969; Goridis & Reutter (1975) Nature (London) 257, 698-700]. Over the same time period after partial hepatectomy, increased tissue concentrations of cyclic GMP were found when the rats were killed under pentobarbital anaesthesia, but not when anaesthesia was omitted. The results obtained on hepatectomized livers were compared with the changes in guanylate cyclase activity and cyclic nucleotide concentrations during the response to galactosamine treatment. Here, a peak of guanylate cyclase activity and of cyclic GMP concentrations occurred at 8h, that is before the beginning of the proliferative response. Both parameters were normal at the time of increased DNA synthesis. There does not, therefore, seem to be a consistent correlation between changes in guanylate cyclase activity or concentrations of cyclic GMP and an increase in liver DNA synthesis. A modest rise in cyclic AMP concentrations was found, however, in livers of galactosamine-treated rats, which was coincident with the time of DNA synthesis. | [
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|
PMID:18147 | Catecholamine-sensitive adenylate cyclase of caudate nucleus and cerebral cortex. Effects of guanine nucleotides. | 1. GTP and GMP-P(NH)P (guanyl-5'-yl imidodiphosphate) were observed to increase the stimulation of neural adenylate cyclase by dopamine (3,4-dihydroxyphenethylamine) and noradrenaline. 2. GMP-P(NH)P had a biphasic effect on the enzyme activity. 3. Preincubation of membranes with GMP-P(NH)P activated the enzyme by a process dependent on time and temperature. Catecholamines increased the speed and the extent of this activation. 4. Membrane fractions contained high- and low-affinity sites for GMP-P(NH)P binding: this binding was due to protein(s) of the membrane preparations. 5. Low-affinity-site binding of GMP-P(NH)P appeared to be related to the stimulatory effect on the adenylate cyclase activity. | Catecholamine-sensitive adenylate cyclase of caudate nucleus and cerebral cortex. Effects of guanine nucleotides. 1. GTP and GMP-P(NH)P (guanyl-5'-yl imidodiphosphate) were observed to increase the stimulation of neural adenylate cyclase by dopamine (3,4-dihydroxyphenethylamine) and noradrenaline. 2. GMP-P(NH)P had a biphasic effect on the enzyme activity. 3. Preincubation of membranes with GMP-P(NH)P activated the enzyme by a process dependent on time and temperature. Catecholamines increased the speed and the extent of this activation. 4. Membrane fractions contained high- and low-affinity sites for GMP-P(NH)P binding: this binding was due to protein(s) of the membrane preparations. 5. Low-affinity-site binding of GMP-P(NH)P appeared to be related to the stimulatory effect on the adenylate cyclase activity. | [
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PMID:18157 | Cardiac action of carazolol and methypranol in comparison with other beta-receptor blockers. | The new beta-blockers 4-(2-hydroxy-3-isopropyl-amino-propoxy)-carbazole (carazolol) and 1-(4-acetoxy-2,3,5-trimethylphenyloxy)-3-isopropylamino-propan-2-ol (methypranol, Disorat) were compared with 14 well-known beta-blocking agents with regard to isoproterenol antagonism (equipotent doses in the rabbit i.v.), acute toxicity (LD50 in mice i.v.) and intrinsic sympathomimetic activity (increase in the heart rate of reserpinized rats i.p.). The following descending order for the equipotent beta-receptor blocking doses was obtained: nifenalol, DCI, pronethalol, practolol, sotalol, alprenolol, bupranolol, toliprolol, propranolol, methypranol, YB 2 pindolol, bunitrolol, oxprenolol, bunolol and carazolol. Carazolol had, in addition, the highest therapeutic index and at beta-receptor blocking doses virtually no intrinsic sympathomimetic activity. | Cardiac action of carazolol and methypranol in comparison with other beta-receptor blockers. The new beta-blockers 4-(2-hydroxy-3-isopropyl-amino-propoxy)-carbazole (carazolol) and 1-(4-acetoxy-2,3,5-trimethylphenyloxy)-3-isopropylamino-propan-2-ol (methypranol, Disorat) were compared with 14 well-known beta-blocking agents with regard to isoproterenol antagonism (equipotent doses in the rabbit i.v.), acute toxicity (LD50 in mice i.v.) and intrinsic sympathomimetic activity (increase in the heart rate of reserpinized rats i.p.). The following descending order for the equipotent beta-receptor blocking doses was obtained: nifenalol, DCI, pronethalol, practolol, sotalol, alprenolol, bupranolol, toliprolol, propranolol, methypranol, YB 2 pindolol, bunitrolol, oxprenolol, bunolol and carazolol. Carazolol had, in addition, the highest therapeutic index and at beta-receptor blocking doses virtually no intrinsic sympathomimetic activity. | [
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PMID:18158 | Bufuralol, a new beta-adrenoceptor blocking agent. Part 1: synthesis and structure-activity studies in a series of benzofuran-2-ethanolamines. | The synthesis and resolution of a new beta-adrenoceptor blocking agent, 1-(7-ethylbenzofuran-2-yl)-2-tert.-butylamino-1-hydroxyethane (bufuralol) are described. Structure-activity studies leading to selection of the title compound are discussed. | Bufuralol, a new beta-adrenoceptor blocking agent. Part 1: synthesis and structure-activity studies in a series of benzofuran-2-ethanolamines. The synthesis and resolution of a new beta-adrenoceptor blocking agent, 1-(7-ethylbenzofuran-2-yl)-2-tert.-butylamino-1-hydroxyethane (bufuralol) are described. Structure-activity studies leading to selection of the title compound are discussed. | [
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PMID:18162 | Studies on the biosynthesis of 16-membered macrolide antibiotics using carbon-13 nuclear magnetic resonance spectroscopy. | The origin of the skeletal carbons in the lactone ring of 16-membered macrolide antiobiotics has been studied. 13C-labeled antibiotics leucomycin and tylosin, have been obtained from the culture broth of Streptomyces kitasatoensis 66-14-3 and Streptomyces fradiae C-373, respectively in the presence of appropriate 13C-labeled precursors, and 13C NMR spectra of the antibiotics thus obtained have been measured. It was shown that the aglycone of leucomycin A3 is derived from five acetates, one propionate, one butyrate, and an unknown precursor corresponding to two carbons. The formyl carbon which is characteristic of the basic 16-membered macrolides orginates from C-4 butyrate. On the other hand, the aglycone of tylosin is formed from two acetates, five propionates and one butyrate. Butyric acid and ethylmalonic acid are metabolized to propionyl-CoA or methylmolonyl-CoA through a pathway involving methylmalonyl-CoA mutase, and subsequently incorporated into the lactone ring of tylosin. | Studies on the biosynthesis of 16-membered macrolide antibiotics using carbon-13 nuclear magnetic resonance spectroscopy. The origin of the skeletal carbons in the lactone ring of 16-membered macrolide antiobiotics has been studied. 13C-labeled antibiotics leucomycin and tylosin, have been obtained from the culture broth of Streptomyces kitasatoensis 66-14-3 and Streptomyces fradiae C-373, respectively in the presence of appropriate 13C-labeled precursors, and 13C NMR spectra of the antibiotics thus obtained have been measured. It was shown that the aglycone of leucomycin A3 is derived from five acetates, one propionate, one butyrate, and an unknown precursor corresponding to two carbons. The formyl carbon which is characteristic of the basic 16-membered macrolides orginates from C-4 butyrate. On the other hand, the aglycone of tylosin is formed from two acetates, five propionates and one butyrate. Butyric acid and ethylmalonic acid are metabolized to propionyl-CoA or methylmolonyl-CoA through a pathway involving methylmalonyl-CoA mutase, and subsequently incorporated into the lactone ring of tylosin. | [
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PMID:18166 | Interaction of the aldolase and the membrane of human erythrocytes. | Up to 80% of cellular aldolase (EC 4.1.2.13) was retained in the membrane fraction isolated following hemolysis of human erythrocytes under appropriate conditions. Binding was reversed by increasing the pH and ionic strength. Millimolar levels of the substrate, fructose 1,6-bisphosphate, selectively eluted aldolase from the membrane, while related metabolites did not. Using the membrane as a high affinity adsorbant, electrophoretically pure aldolase of high specific activity was prepared in high yield. The reassociation of pure aldolase and membranes was characterized. The sole site of human erythrocyte aldolase binding was shown to be the cytoplasmic surface domain of band 3, the predominant membrane-spanning polypeptide. One aldolase molecule was bound per band 3 polypeptide. Upon binding to either whole membranes, solubilized band 3, or proteolytic fragments from the cytoplasmic surface pole of band 3, aldolase underwent a profound loss of catalytic activity, reversed by raising the substrate concentration. | Interaction of the aldolase and the membrane of human erythrocytes. Up to 80% of cellular aldolase (EC 4.1.2.13) was retained in the membrane fraction isolated following hemolysis of human erythrocytes under appropriate conditions. Binding was reversed by increasing the pH and ionic strength. Millimolar levels of the substrate, fructose 1,6-bisphosphate, selectively eluted aldolase from the membrane, while related metabolites did not. Using the membrane as a high affinity adsorbant, electrophoretically pure aldolase of high specific activity was prepared in high yield. The reassociation of pure aldolase and membranes was characterized. The sole site of human erythrocyte aldolase binding was shown to be the cytoplasmic surface domain of band 3, the predominant membrane-spanning polypeptide. One aldolase molecule was bound per band 3 polypeptide. Upon binding to either whole membranes, solubilized band 3, or proteolytic fragments from the cytoplasmic surface pole of band 3, aldolase underwent a profound loss of catalytic activity, reversed by raising the substrate concentration. | [
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PMID:18169 | The effect of calcium on the respiratory responses of mung bean mitochondria. | Purified mung bean hypocotyl mitochondria were examined for their capacity to carry out respiration-dependent accumulation of calcium. The addition of 0.1-1.0 mM calcium to mung bean mitochondria supplemented with succinate gave no stimulation of state 4 respiration even in the presence of inorganic phosphate and the ionophoretic antibiotic A-23187. Even at high calcium concentrations, no transient changes in the respiratory activity occurred and subsequent addition of ADP initiated a further state 3 response. Although the additions of calcium resulted in a rapid H+ ejection, it was insensitive to lanthanum and uncoupling agents. Similarly, additions of calcium failed to initiate any transient changes in the oxidation-reduction states of either pyridine nucleotides or cytochrome b. Direct spectrophotometric recordings of absorbance changes of murexide revealed no respiration-linked calcium transport. It is proposed that although mung bean mitochondria possess a respiration-linked electrochemical potential gradient it would appear that this potential cannot be expressed as calcium transport even at high ion concentrations, probably due to a low calcium membrane permeability. | The effect of calcium on the respiratory responses of mung bean mitochondria. Purified mung bean hypocotyl mitochondria were examined for their capacity to carry out respiration-dependent accumulation of calcium. The addition of 0.1-1.0 mM calcium to mung bean mitochondria supplemented with succinate gave no stimulation of state 4 respiration even in the presence of inorganic phosphate and the ionophoretic antibiotic A-23187. Even at high calcium concentrations, no transient changes in the respiratory activity occurred and subsequent addition of ADP initiated a further state 3 response. Although the additions of calcium resulted in a rapid H+ ejection, it was insensitive to lanthanum and uncoupling agents. Similarly, additions of calcium failed to initiate any transient changes in the oxidation-reduction states of either pyridine nucleotides or cytochrome b. Direct spectrophotometric recordings of absorbance changes of murexide revealed no respiration-linked calcium transport. It is proposed that although mung bean mitochondria possess a respiration-linked electrochemical potential gradient it would appear that this potential cannot be expressed as calcium transport even at high ion concentrations, probably due to a low calcium membrane permeability. | [
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|
PMID:18170 | A simple procedure for isolating adenosine triphosphatase from mitochondria. | A simple method for isolation of adenosine triphosphatase (EC 3.6.1.3) from mitochondria is described. The enzyme is released from mitochondrial Lubrol particles by drastic sonication and purified by gel filtration on Sepharose 6-B. The described procedure is effective in isolating adenosine triphosphatase from rat liver as it is from beef heart mitochondria. The enzyme isolated from beef heart has a specific activity of 120 mumol P/min per mg protein and enzyme isolated from rat liver has a specific activity of 70 mumol P/min per mg protein when measured as a release of inorganic phosphate. | A simple procedure for isolating adenosine triphosphatase from mitochondria. A simple method for isolation of adenosine triphosphatase (EC 3.6.1.3) from mitochondria is described. The enzyme is released from mitochondrial Lubrol particles by drastic sonication and purified by gel filtration on Sepharose 6-B. The described procedure is effective in isolating adenosine triphosphatase from rat liver as it is from beef heart mitochondria. The enzyme isolated from beef heart has a specific activity of 120 mumol P/min per mg protein and enzyme isolated from rat liver has a specific activity of 70 mumol P/min per mg protein when measured as a release of inorganic phosphate. | [
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|
PMID:18171 | ZETA-Potential and surface charge of Thermoplasma acidophila. | The surface charge density and the zeta-potential of Thermoplasma acidophila was estimated from microscopic electrophoresis experiments. The cells moved towards the positive electrode. The mobility remained constant from pH 2 to 5, and increased for pH values higher than 6. The mobility at pH 6 decreased dramatically with increased external Ca2+ concentration. At pH 2 and an ionic strength similar to that of the growth medium, the zeta-potential was about 8 mV, negative relative to the bulk medium; the surface charge density was 1360esu/cm-2 which corresponds to one elementary charge per 3500 A2. | ZETA-Potential and surface charge of Thermoplasma acidophila. The surface charge density and the zeta-potential of Thermoplasma acidophila was estimated from microscopic electrophoresis experiments. The cells moved towards the positive electrode. The mobility remained constant from pH 2 to 5, and increased for pH values higher than 6. The mobility at pH 6 decreased dramatically with increased external Ca2+ concentration. At pH 2 and an ionic strength similar to that of the growth medium, the zeta-potential was about 8 mV, negative relative to the bulk medium; the surface charge density was 1360esu/cm-2 which corresponds to one elementary charge per 3500 A2. | [
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PMID:18172 | H/2H isotope effect in redox reactions of cytochrome c. | The rate of reaction of ferro- and ferricytochrome c (C(II) and C(III) with ferri- and ferrocyanide and of C(III) with 02- and CO2- was determined in H2O and in 2H2O in the temperature range 5-35 degrees C. No isotope effect was evident in any of the reductions of C(III); the apparent energy of activation was identical in H2O and 2H2O. An isotope effect with kH2O/k2H2O = 1.25 to 1.85, depending on pH for instance was observed in the oxidation of C(II), in the slow phase of oxidation which involves conformational changes. An interpretation (supported by evidence from previous work) involving water molecules in the close vicinity of the reaction site on the protein is discussed. | H/2H isotope effect in redox reactions of cytochrome c. The rate of reaction of ferro- and ferricytochrome c (C(II) and C(III) with ferri- and ferrocyanide and of C(III) with 02- and CO2- was determined in H2O and in 2H2O in the temperature range 5-35 degrees C. No isotope effect was evident in any of the reductions of C(III); the apparent energy of activation was identical in H2O and 2H2O. An isotope effect with kH2O/k2H2O = 1.25 to 1.85, depending on pH for instance was observed in the oxidation of C(II), in the slow phase of oxidation which involves conformational changes. An interpretation (supported by evidence from previous work) involving water molecules in the close vicinity of the reaction site on the protein is discussed. | [
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|
PMID:18173 | CO2 reduction by intact chloroplasts under a diminished proton gradient. | 9-Aminoacridine has been used to monitor the intrathylakoid pH of photosynthetically competent intact chloroplasts. Values obtained from 9-aminoacridine accumulation in the chloroplasts must be corrected for light-dependent binding of 9-aminoacridine to the thylakoid membranes. During nitrite reduction by intact chloroplasts, the intrathylakoid proton concentration increased. It decreased somewhat during CO2 reduction. However, low concentrations of uncoupling amines such as NH3 or cyclohexylamine, which rapidly penetrated the chloroplast envelope and decreased the intrathylakoid proton concentration, failed to reduce, and actually stimulated, rates of CO2-dependent oxygen evolution even under rate-limiting light. In contrast, low concentrations of carbonyl cyanide p-trifluoromethoxyphenylhydrazone (FCCP) OR NIGERICIN, WHICH INHIBITED CO2 reduction, even appeared to increase the intrathylakoid proton concentration. As indicated by measurements of the 515 nm signal of the chloroplasts, the light-induced membrane potential was not much affected by low concentrations of the uncoupling amines, but was decreased by FCCP and by high concentrations of the amines. Even in the presence of high concentrations of NH4C1, ATP/ADP ratios of illuminated chloroplasts remained far above the ratios observed in the dark. In contrast, low concentrations of FCCP were sufficient to reduce ATP/ADP ratios to the dark value even under high intensity illumination. The observations are difficult to explain within the framework of the chemiosmotic hypothesis as presently discussed. | CO2 reduction by intact chloroplasts under a diminished proton gradient. 9-Aminoacridine has been used to monitor the intrathylakoid pH of photosynthetically competent intact chloroplasts. Values obtained from 9-aminoacridine accumulation in the chloroplasts must be corrected for light-dependent binding of 9-aminoacridine to the thylakoid membranes. During nitrite reduction by intact chloroplasts, the intrathylakoid proton concentration increased. It decreased somewhat during CO2 reduction. However, low concentrations of uncoupling amines such as NH3 or cyclohexylamine, which rapidly penetrated the chloroplast envelope and decreased the intrathylakoid proton concentration, failed to reduce, and actually stimulated, rates of CO2-dependent oxygen evolution even under rate-limiting light. In contrast, low concentrations of carbonyl cyanide p-trifluoromethoxyphenylhydrazone (FCCP) OR NIGERICIN, WHICH INHIBITED CO2 reduction, even appeared to increase the intrathylakoid proton concentration. As indicated by measurements of the 515 nm signal of the chloroplasts, the light-induced membrane potential was not much affected by low concentrations of the uncoupling amines, but was decreased by FCCP and by high concentrations of the amines. Even in the presence of high concentrations of NH4C1, ATP/ADP ratios of illuminated chloroplasts remained far above the ratios observed in the dark. In contrast, low concentrations of FCCP were sufficient to reduce ATP/ADP ratios to the dark value even under high intensity illumination. The observations are difficult to explain within the framework of the chemiosmotic hypothesis as presently discussed. | [
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PMID:18174 | The effect of chloroplast coupling factor removal on thylakoid membrane ion permeability. | Removal of coupling factor protein (CF1) from spinach thylakoid membranes results in an enhancement of proton permeability but has no effect on chloride or potassium permeability. Anion permeability was measured by the rate of thylakoid packed volume changes. Potassium permeability was monitored by turbidity changes, packed thylakoid volume changes and ion flux studies using 86Rb+ as a tracer. 45Ca2+ was used to measure divalent cation fluxes. CF1-depleted chloroplasts had an unaltered rate of Ca2+ uptake, but the rate of Ca2+ efflux appeared to be increased. Calcium efflux rates could also be increased by the addition of a proton specific uncoupler, FCCP. | The effect of chloroplast coupling factor removal on thylakoid membrane ion permeability. Removal of coupling factor protein (CF1) from spinach thylakoid membranes results in an enhancement of proton permeability but has no effect on chloride or potassium permeability. Anion permeability was measured by the rate of thylakoid packed volume changes. Potassium permeability was monitored by turbidity changes, packed thylakoid volume changes and ion flux studies using 86Rb+ as a tracer. 45Ca2+ was used to measure divalent cation fluxes. CF1-depleted chloroplasts had an unaltered rate of Ca2+ uptake, but the rate of Ca2+ efflux appeared to be increased. Calcium efflux rates could also be increased by the addition of a proton specific uncoupler, FCCP. | [
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|
PMID:18175 | Identification of S2 as the sensitive state to alkaline photoinactivation of photosystem II in chloroplasts. | 1. Chloroplasts have been preilluminated by a sequence of n short saturating flashes immediately before alkalinization to pH 9.3, and brought back 2 min later to pH 7.8. The assay of Photosystem II activity through dichlorophenolindophenol photoreduction, oxygen evolution, fluorescence induction, shows that part of the centers is inactivated and that this part depends on the number of preilluminating flashes (maximum inhibition after one flash) in a way which suggests identification of state S2 as the target for alkaline inactivation. 2. As shown by Reimer and Trebst ((1975) Biochem. Physiol. Pflanz. 168, 225-232) the inactivation necessitates the presence of gramicidin, which shows that the sensitive site is on the internal side of the thylakoid membrane. 3. The electron flow through inactivated Photosystem II is restored by artificial donor addition (diphenylcarbazide or hydroxylamine); this suggests that the water-splitting enzyme itself is blocked. The inactivation is accompanied by a solubilization of bound Mn2+ and by the occurence of EPR Signal II "fast". 4. Glutaraldehyde fixation before the treatment does not prevent the inactivation which thus does not seem to involve a protein structural change. | Identification of S2 as the sensitive state to alkaline photoinactivation of photosystem II in chloroplasts. 1. Chloroplasts have been preilluminated by a sequence of n short saturating flashes immediately before alkalinization to pH 9.3, and brought back 2 min later to pH 7.8. The assay of Photosystem II activity through dichlorophenolindophenol photoreduction, oxygen evolution, fluorescence induction, shows that part of the centers is inactivated and that this part depends on the number of preilluminating flashes (maximum inhibition after one flash) in a way which suggests identification of state S2 as the target for alkaline inactivation. 2. As shown by Reimer and Trebst ((1975) Biochem. Physiol. Pflanz. 168, 225-232) the inactivation necessitates the presence of gramicidin, which shows that the sensitive site is on the internal side of the thylakoid membrane. 3. The electron flow through inactivated Photosystem II is restored by artificial donor addition (diphenylcarbazide or hydroxylamine); this suggests that the water-splitting enzyme itself is blocked. The inactivation is accompanied by a solubilization of bound Mn2+ and by the occurence of EPR Signal II "fast". 4. Glutaraldehyde fixation before the treatment does not prevent the inactivation which thus does not seem to involve a protein structural change. | [
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|
PMID:18177 | A Cl-/HCO-3-ATPase in the gills of Carassius auratus. Its inhibition by thiocyanate. | An ATPase is demonstrated in plasma membrane fractions of goldfish gills. This enzyme is stimulated by Cl- and HCO-3, inhibited by SCN-. Biochemical characterization shows that HCO-3 stimulation (Km = 2.5 mequiv./l) is specifically inhibited in a competitive fashion by SCN- (Ki = 0.25 mequiv./l). This residual Mg2+-dependent activity is weakly affected by SCN-. In the microsomal fraction chloride stimulation of the enzyme occurs in the presence of HCO-3 (Km for chloride = 1 mequiv/l); no stimulation is observed in the absence of HCO-3. Thiocyanate exhibits a mixed type of inhibition (Ki = 0.06 mequiv./l) towards the Cl- stimulation of the enzyme. Bicarbonate-dependent ATPase from the mitochondrial fraction is stimulated by Cl-, but this enzyme has a relatively weak affinity for this substrate (Km = 14 mequiv./l). | A Cl-/HCO-3-ATPase in the gills of Carassius auratus. Its inhibition by thiocyanate. An ATPase is demonstrated in plasma membrane fractions of goldfish gills. This enzyme is stimulated by Cl- and HCO-3, inhibited by SCN-. Biochemical characterization shows that HCO-3 stimulation (Km = 2.5 mequiv./l) is specifically inhibited in a competitive fashion by SCN- (Ki = 0.25 mequiv./l). This residual Mg2+-dependent activity is weakly affected by SCN-. In the microsomal fraction chloride stimulation of the enzyme occurs in the presence of HCO-3 (Km for chloride = 1 mequiv/l); no stimulation is observed in the absence of HCO-3. Thiocyanate exhibits a mixed type of inhibition (Ki = 0.06 mequiv./l) towards the Cl- stimulation of the enzyme. Bicarbonate-dependent ATPase from the mitochondrial fraction is stimulated by Cl-, but this enzyme has a relatively weak affinity for this substrate (Km = 14 mequiv./l). | [
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|
PMID:18179 | Proton-induced uptake of mammalian DNA by dog erythrocyte pink ghosts. | Low pH (below 6) induces the uptake of mammalian DNA in dog erythrocyte pink ghosts. Uptake requires either Ca2+ or Mg2+ and is stimulated by ATP. These agents induce a rapid sphering of the ghosts at 37 degrees C and sphering is required for uptake. Uptake is increased in ghosts which have been incubated 60-90 min before adding the DNA. Uptake is strongly temperature-dependent. Lowering the temperature of a suspension of ghosts taking up DNA at 37-0 degrees C stops uptake. It is concluded that uptake depends on active membrane processes and that it may depend on the capacity of the ghosts to maintain cation exchange. | Proton-induced uptake of mammalian DNA by dog erythrocyte pink ghosts. Low pH (below 6) induces the uptake of mammalian DNA in dog erythrocyte pink ghosts. Uptake requires either Ca2+ or Mg2+ and is stimulated by ATP. These agents induce a rapid sphering of the ghosts at 37 degrees C and sphering is required for uptake. Uptake is increased in ghosts which have been incubated 60-90 min before adding the DNA. Uptake is strongly temperature-dependent. Lowering the temperature of a suspension of ghosts taking up DNA at 37-0 degrees C stops uptake. It is concluded that uptake depends on active membrane processes and that it may depend on the capacity of the ghosts to maintain cation exchange. | [
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PMID:18180 | Regulatory effects of purine nucleotide analogs with liver glutamate dehydrogenase. | A total of 26 different purine nucleotides with specific modifications in the base moiety and/or in the polyphosphate chain as well as various combinations of nucleotides were tested as allosteric effectors of beef liver glutamate dehydrogenase (L-glutamate : NAD(P)+ oxidoreductase (deaminating), EC 1.4.1.3). The capacity of these nucleotide analogs to activate or to inhibit the glutamate dehydrogenase activity is expressed quantitatively and scaled between the extreme effects of ADP and GTP, respectively. The significance of distinct structural elements for the enzyme-effector interaction is discussed. While the inhibitory GTP site is less specific, accepting many natural and most modified nucleoside triphosphates as inhibitors, the activating ADP site shows a much higher specificity for nucleotides as activators. | Regulatory effects of purine nucleotide analogs with liver glutamate dehydrogenase. A total of 26 different purine nucleotides with specific modifications in the base moiety and/or in the polyphosphate chain as well as various combinations of nucleotides were tested as allosteric effectors of beef liver glutamate dehydrogenase (L-glutamate : NAD(P)+ oxidoreductase (deaminating), EC 1.4.1.3). The capacity of these nucleotide analogs to activate or to inhibit the glutamate dehydrogenase activity is expressed quantitatively and scaled between the extreme effects of ADP and GTP, respectively. The significance of distinct structural elements for the enzyme-effector interaction is discussed. While the inhibitory GTP site is less specific, accepting many natural and most modified nucleoside triphosphates as inhibitors, the activating ADP site shows a much higher specificity for nucleotides as activators. | [
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|
PMID:18181 | Reduction of oxidised folates by dihydrofolate reductase from methotrexate-resistant Lactobacillus casei. | The use of alternative substrates by dihydrofolate reductase (5,6,7,8-tetrahydrofolate: NADP+ oxidoreductase, EC 1.5.1.3) was investigated as a possible mechanism for the resistance of Lactobacillus casei to the cytotoxic drug methotrexate. The reduction of folic acid and 10-formylfolic acid by homogeneous enzyme was compared to that of the normal substrate, dihydrofolic acid. The three substrates have different pH optima and Km values. In addition, it was found that the reduction of 10-formylfolic acid was markedly stimulated by the presence of ions. Although the reduction was sensitive to methotrexate in all cases, the ion activation may be of importance in partially inhibited systems. | Reduction of oxidised folates by dihydrofolate reductase from methotrexate-resistant Lactobacillus casei. The use of alternative substrates by dihydrofolate reductase (5,6,7,8-tetrahydrofolate: NADP+ oxidoreductase, EC 1.5.1.3) was investigated as a possible mechanism for the resistance of Lactobacillus casei to the cytotoxic drug methotrexate. The reduction of folic acid and 10-formylfolic acid by homogeneous enzyme was compared to that of the normal substrate, dihydrofolic acid. The three substrates have different pH optima and Km values. In addition, it was found that the reduction of 10-formylfolic acid was markedly stimulated by the presence of ions. Although the reduction was sensitive to methotrexate in all cases, the ion activation may be of importance in partially inhibited systems. | [
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|
PMID:18182 | Purification and properties of the NAD(P)H:nitrate reductase of the yeast Rhodotorula glutinis. | The assimilatory nitrate reductase from the yeast Rhodotorula glutinus has been purified 740-fold, its different catalytic activities have been characterized and some inhibitors studied. The purified enzyme (150 units per mg protein) contains a cytochrome of the b-557 type. An S20,w of 7.9 S was found by the use of sucrose density gradient centrifugation, and a Stokes radius of 7.05 nm was determined by gel filtration. From these values, a molecular weight of 230 000 was estimated for the native enzyme. The purified preparation consisted of two electrophoretically distinguishable proteins, both of which exhibited nitrate reductase activity. The species with the higher electrophoretic mobility which represented the great majority of the total nitrate reductase gave a positive stain for heme and was shown to be composed of subunits with a molecular weight of about 118 000. Thus the molecule contains two subunits of the same size. | Purification and properties of the NAD(P)H:nitrate reductase of the yeast Rhodotorula glutinis. The assimilatory nitrate reductase from the yeast Rhodotorula glutinus has been purified 740-fold, its different catalytic activities have been characterized and some inhibitors studied. The purified enzyme (150 units per mg protein) contains a cytochrome of the b-557 type. An S20,w of 7.9 S was found by the use of sucrose density gradient centrifugation, and a Stokes radius of 7.05 nm was determined by gel filtration. From these values, a molecular weight of 230 000 was estimated for the native enzyme. The purified preparation consisted of two electrophoretically distinguishable proteins, both of which exhibited nitrate reductase activity. The species with the higher electrophoretic mobility which represented the great majority of the total nitrate reductase gave a positive stain for heme and was shown to be composed of subunits with a molecular weight of about 118 000. Thus the molecule contains two subunits of the same size. | [
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PMID:18183 | On the determination of isozyme levels in preparations containing cytoplasmic and mitochondrial aspartate aminotransferase. | A spectrophotometric assay has been developed for the determination of the content of each isozyme of aspartate transaminase (L-aspartate:2-oxoglutarate aminotransferase, EC 2.6.1.1) in physiological fluids or tissue extracts. The methods relies on the ability of adipate, at low pH and ionic strength to inhibit the cytoplasmic isozyme but not the one from mitochondria. Two assays are necessary, one at pH 8.0 which measures the content of both isozymes and another at low pH which measures primarily the amount of mitochondrial isozyme. Results obtained by this simple procedure match those in which each isozyme is inhibited by its antibody. The validity of the results obtained by the new method was tested at different ratios of cytoplasmic:mitochondrial isozyme and with tissue extracts. Since the amounts of each isozyme determined by radial immunodiffusion match those values gathered by following enzymatic activity, it is concluded that the quantity of each isozyme obtained from its respective catalytic activity must represent the total protein content of each isozyme in a given sample. | On the determination of isozyme levels in preparations containing cytoplasmic and mitochondrial aspartate aminotransferase. A spectrophotometric assay has been developed for the determination of the content of each isozyme of aspartate transaminase (L-aspartate:2-oxoglutarate aminotransferase, EC 2.6.1.1) in physiological fluids or tissue extracts. The methods relies on the ability of adipate, at low pH and ionic strength to inhibit the cytoplasmic isozyme but not the one from mitochondria. Two assays are necessary, one at pH 8.0 which measures the content of both isozymes and another at low pH which measures primarily the amount of mitochondrial isozyme. Results obtained by this simple procedure match those in which each isozyme is inhibited by its antibody. The validity of the results obtained by the new method was tested at different ratios of cytoplasmic:mitochondrial isozyme and with tissue extracts. Since the amounts of each isozyme determined by radial immunodiffusion match those values gathered by following enzymatic activity, it is concluded that the quantity of each isozyme obtained from its respective catalytic activity must represent the total protein content of each isozyme in a given sample. | [
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|
PMID:18184 | Protein kinases of rabbit and human erythrocyte membranes. Solubilization and characterization. | Two protein kinases (EC 2.7.1.37) from rabbit and one from human erythrocyte membranes have been solubilized with 0.5 M NaCl. These enzymes have been partially purified by (NH4)2SO4 fractionation and gel filtration. The rabbit membrane enzymes have apparent Mr values of 100 000 and 30 000, as determined in the presence of 0.4 M NaCl. In the absence of salt, these enzymes aggregate into high molecular weight species. The kinase from human erythrocyte membranes has an apparent Mr of 30 000 and appears to have properties similar to those of the 30 000-dalton rabbit kinase. All three enzymes catalyze the phosphorylation of casein and phosvitin in salt-stimulated reactions. None of these enzymes appears to be related to cyclic AMP-dependent protein kinases. | Protein kinases of rabbit and human erythrocyte membranes. Solubilization and characterization. Two protein kinases (EC 2.7.1.37) from rabbit and one from human erythrocyte membranes have been solubilized with 0.5 M NaCl. These enzymes have been partially purified by (NH4)2SO4 fractionation and gel filtration. The rabbit membrane enzymes have apparent Mr values of 100 000 and 30 000, as determined in the presence of 0.4 M NaCl. In the absence of salt, these enzymes aggregate into high molecular weight species. The kinase from human erythrocyte membranes has an apparent Mr of 30 000 and appears to have properties similar to those of the 30 000-dalton rabbit kinase. All three enzymes catalyze the phosphorylation of casein and phosvitin in salt-stimulated reactions. None of these enzymes appears to be related to cyclic AMP-dependent protein kinases. | [
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PMID:18185 | The influence of changes in the phospholipid pattern of intact fibroblasts on the activities of four membrane-bound enzymes. | Human skin fibroblasts, grown to confluency in the presence of 32P for random labelling of the phospholipids, showed upon 24 h incubation in the presence of either 8 mM L-serine or 4 mM ethanolamine an increased content of phosphatidylserine (150% of control cells) or phosphatidylethanolamine (116% of control cells), respectively. Concomitantly the phosphatidylcholine correspondingly decreased. Upon cell harvesting and gentle enzyme preparation the base-treated cells demonstrated a significantly higher unstimulated, fluoride- and thyrotropin-stimulated activity of adenylate cyclase. The activities of total ATPase, ouabain-sensitive ATPase, 5'-nucleotidase and gamma-glutamyltransferase remained unaltered. When subjecting enzyme preparations from fibroblasts to ultrasonication the activity of adenylate cyclase decreased progressively with energy applied, whereas the activities of the other enzymes were unaltered ((K+ + Na+)-ATPase, 5'-nucleotidase) or even increased (Mg2+-ATPase, gamma-glutamyltransferase). The results have a bearing upon the regulatory function of the phospholipid microenvironment of membrane-bound enzymes. | The influence of changes in the phospholipid pattern of intact fibroblasts on the activities of four membrane-bound enzymes. Human skin fibroblasts, grown to confluency in the presence of 32P for random labelling of the phospholipids, showed upon 24 h incubation in the presence of either 8 mM L-serine or 4 mM ethanolamine an increased content of phosphatidylserine (150% of control cells) or phosphatidylethanolamine (116% of control cells), respectively. Concomitantly the phosphatidylcholine correspondingly decreased. Upon cell harvesting and gentle enzyme preparation the base-treated cells demonstrated a significantly higher unstimulated, fluoride- and thyrotropin-stimulated activity of adenylate cyclase. The activities of total ATPase, ouabain-sensitive ATPase, 5'-nucleotidase and gamma-glutamyltransferase remained unaltered. When subjecting enzyme preparations from fibroblasts to ultrasonication the activity of adenylate cyclase decreased progressively with energy applied, whereas the activities of the other enzymes were unaltered ((K+ + Na+)-ATPase, 5'-nucleotidase) or even increased (Mg2+-ATPase, gamma-glutamyltransferase). The results have a bearing upon the regulatory function of the phospholipid microenvironment of membrane-bound enzymes. | [
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|
PMID:18186 | Biochemical characterization of alkaline phosphatase in guinea pig thymus. | 1. Alkaline phosphatase (orthophosphoric-monoester phosphohydrolase (alkaline optimum), EC 3.1.3.1) in guinea pig thymus was extracted optimally in 10 mM Tris - HCl buffer at pH 8.0 containing 5 g/l Triton X-100. 2. alpha-Glycerophosphate, beta-glycerophosphate and phenolphthalein monophosphate were hydrolyzed by thymus extract with a pH optimum at 9.8-10.0, whereas p-nitrophenylphosphate and alpha-naphthylphosphate were hydrolyzed with pH optima at 10.7-10.8 and beta-naphthylphosphate at pH 11.2. P-Nitrophenylphosphate and phenolphthalein monophosphate proved to be the most suitable substrates. 3. Alkaline phosphatase was effectively inhibited by EDTA, Zn2+, histidine and urea therefore resembling the inhibition characteristics of alkaline phosphatase in the placenta and kidney, but not that in the liver and intestine, which differed markedly. 4. DEAE-cellulose chromatography and polyacrylamide disc electrophoresis revealed three enzyme peaks which did not differ in their substrate specificities and modifier characteristics. 5. Polyacrylamide disc electrophoresis of thymus, serum, placenta, kidney, liver, bone and intestine revealed no alkaline phosphatase bands definitely unique to thymus. | Biochemical characterization of alkaline phosphatase in guinea pig thymus. 1. Alkaline phosphatase (orthophosphoric-monoester phosphohydrolase (alkaline optimum), EC 3.1.3.1) in guinea pig thymus was extracted optimally in 10 mM Tris - HCl buffer at pH 8.0 containing 5 g/l Triton X-100. 2. alpha-Glycerophosphate, beta-glycerophosphate and phenolphthalein monophosphate were hydrolyzed by thymus extract with a pH optimum at 9.8-10.0, whereas p-nitrophenylphosphate and alpha-naphthylphosphate were hydrolyzed with pH optima at 10.7-10.8 and beta-naphthylphosphate at pH 11.2. P-Nitrophenylphosphate and phenolphthalein monophosphate proved to be the most suitable substrates. 3. Alkaline phosphatase was effectively inhibited by EDTA, Zn2+, histidine and urea therefore resembling the inhibition characteristics of alkaline phosphatase in the placenta and kidney, but not that in the liver and intestine, which differed markedly. 4. DEAE-cellulose chromatography and polyacrylamide disc electrophoresis revealed three enzyme peaks which did not differ in their substrate specificities and modifier characteristics. 5. Polyacrylamide disc electrophoresis of thymus, serum, placenta, kidney, liver, bone and intestine revealed no alkaline phosphatase bands definitely unique to thymus. | [
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PMID:18191 | Histidine and lysine residues and the activity of phospholipase A2 from the venom of Bitis gabonica. | Chemical modification of phospholipase A2 (phosphatide 2-acyl-hydrolase, EC 3.1.1.4) from the venom of gaboon adder (Bitis gabonica) showed that histidine and lysine residues are essential for enzyme activity. Treatment with p-bromophenacyl bromide or pyridoxal 5'-phosphate resulted in the specific covalent modification of one histidine or a total of one lysine residue per molecule of enzyme, respectively, with a concomitant loss of enzyme activity. Competitive protection against modification and inactivation was afforded by the presence of Ca2+ and/or micellar concentrations of substrate analogue, lysophosphatidylcholine. Neither modification caused any significant conformational change, as judged from circular dichroic properties. Amino acid analyses and the alignment of peptides from cyanogen bromide and proteolytic cleavage of modified enzyme preparations delineated His-45 as the only residue modified by p-bromophenacyl bromide. However, pyridoxal 5'-phosphate was shown to have reacted not with a single lysine but with four different ones (residues 11, 33, 58 and 111) in such a manner that an overall stoichiometry of one modified lysine residue/molecule enzyme resulted. Apparently, the essential function of lysine could be fulfilled by any one out of these four residues. | Histidine and lysine residues and the activity of phospholipase A2 from the venom of Bitis gabonica. Chemical modification of phospholipase A2 (phosphatide 2-acyl-hydrolase, EC 3.1.1.4) from the venom of gaboon adder (Bitis gabonica) showed that histidine and lysine residues are essential for enzyme activity. Treatment with p-bromophenacyl bromide or pyridoxal 5'-phosphate resulted in the specific covalent modification of one histidine or a total of one lysine residue per molecule of enzyme, respectively, with a concomitant loss of enzyme activity. Competitive protection against modification and inactivation was afforded by the presence of Ca2+ and/or micellar concentrations of substrate analogue, lysophosphatidylcholine. Neither modification caused any significant conformational change, as judged from circular dichroic properties. Amino acid analyses and the alignment of peptides from cyanogen bromide and proteolytic cleavage of modified enzyme preparations delineated His-45 as the only residue modified by p-bromophenacyl bromide. However, pyridoxal 5'-phosphate was shown to have reacted not with a single lysine but with four different ones (residues 11, 33, 58 and 111) in such a manner that an overall stoichiometry of one modified lysine residue/molecule enzyme resulted. Apparently, the essential function of lysine could be fulfilled by any one out of these four residues. | [
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PMID:18193 | Intrinsic catalytic activity of procarboxypeptidase A. A kinetic study using fluorine analogues. | Bovine procarboxypeptidase A displays substantial catalytic activity toward halogenated acyl-amino acids, the most active of which is trifluoroacetyl-L-phenylalanine (TFAc-L-Phe). Though this activity is not as great as for the native enzyme, it is quite substantial and far beyond the range of adventitious activation. Both DL-benzylcuccinate and beta-phenylpropionate inhibit zymogen hydrolysis of TFAc-L-Phe, the former with a K1 of 4.1 micrometer and the latter, 900 micrometer (a value much higher than the corresponding enzyme). Apo procarboxypeptidase A will also hydrolyze TFAc-L-Phe, presumably the polarization of the carbonyl carbon being accomplished by the fluorine atoms in the absence of a specific metal ion. That this is not entirely the metal ion function is indicated by the fact that rate enhancements follow the order manganese procarboxypeptidase A approximately zinc procarboxypeptidase greater than apo-procarboxypeptidase. The results indicate considerable similarities for the zymogen-enzyme pair in terms of catalytic groups, pH dependence, specificity and the nature of their transition state binding sites. Some changes in the substrate or inhibitor binding sites are noted. | Intrinsic catalytic activity of procarboxypeptidase A. A kinetic study using fluorine analogues. Bovine procarboxypeptidase A displays substantial catalytic activity toward halogenated acyl-amino acids, the most active of which is trifluoroacetyl-L-phenylalanine (TFAc-L-Phe). Though this activity is not as great as for the native enzyme, it is quite substantial and far beyond the range of adventitious activation. Both DL-benzylcuccinate and beta-phenylpropionate inhibit zymogen hydrolysis of TFAc-L-Phe, the former with a K1 of 4.1 micrometer and the latter, 900 micrometer (a value much higher than the corresponding enzyme). Apo procarboxypeptidase A will also hydrolyze TFAc-L-Phe, presumably the polarization of the carbonyl carbon being accomplished by the fluorine atoms in the absence of a specific metal ion. That this is not entirely the metal ion function is indicated by the fact that rate enhancements follow the order manganese procarboxypeptidase A approximately zinc procarboxypeptidase greater than apo-procarboxypeptidase. The results indicate considerable similarities for the zymogen-enzyme pair in terms of catalytic groups, pH dependence, specificity and the nature of their transition state binding sites. Some changes in the substrate or inhibitor binding sites are noted. | [
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|
PMID:18194 | Studies on (Na+ +K+) activated ATPase. XLI. Effects of N-ethylmaleimide on overall and partial reactions. | 1. Preincubation with N-ethylmaleimide inhibits the overall activity of highly purified (Na+ +K+)-ATPase (ATP phosphohydrolase, EC 3.6.1.3) preparations of rabbit kidney outer medulla. 2. This inhibition is decreased by addition of ATP or 4-nitrophenylphosphate under non-phosphorylating conditions, and also by addition of ADP or adenylylimidodiphosphate. 3. N-ethylmaleimide treatment leads to inhibition of K+-stimulated 4-nitrophenylphosphatase activity, Na+-stimulated ATPase activity, and phosphorylation by ATP as well as by inorganic phosphate. These inhibitions strictly parallel that of the overal (Na+ +K+)-ATPase reaction. 4. N-ethylmaleimide lowers the number of sites which are phosphorylated by inorganic phosphate, without affecting the dissociation constant of the enzyme-phosphate complex. 5. N-ethylmaleimide does not affect the relative stimulation by ATP of the K+-stimulated 4-nitrophenylphosphatase activity. 6. These effects of N-ethylmaleimide can be explained as a complete loss of active enzyme, either by reaction of N-ethylmaleimide inside the active center, or by alterations in the quaternary structure through reactions outside the active center. | Studies on (Na+ +K+) activated ATPase. XLI. Effects of N-ethylmaleimide on overall and partial reactions. 1. Preincubation with N-ethylmaleimide inhibits the overall activity of highly purified (Na+ +K+)-ATPase (ATP phosphohydrolase, EC 3.6.1.3) preparations of rabbit kidney outer medulla. 2. This inhibition is decreased by addition of ATP or 4-nitrophenylphosphate under non-phosphorylating conditions, and also by addition of ADP or adenylylimidodiphosphate. 3. N-ethylmaleimide treatment leads to inhibition of K+-stimulated 4-nitrophenylphosphatase activity, Na+-stimulated ATPase activity, and phosphorylation by ATP as well as by inorganic phosphate. These inhibitions strictly parallel that of the overal (Na+ +K+)-ATPase reaction. 4. N-ethylmaleimide lowers the number of sites which are phosphorylated by inorganic phosphate, without affecting the dissociation constant of the enzyme-phosphate complex. 5. N-ethylmaleimide does not affect the relative stimulation by ATP of the K+-stimulated 4-nitrophenylphosphatase activity. 6. These effects of N-ethylmaleimide can be explained as a complete loss of active enzyme, either by reaction of N-ethylmaleimide inside the active center, or by alterations in the quaternary structure through reactions outside the active center. | [
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|
PMID:18195 | Concerted inhibition of NADP+-specific isocitrate dehydrogenase by oxalacetate and glyoxylate. I. Oxalomalate formation and stability, and nature of the enzyme inhibition. | Oxalacetate and glyoxylate are each weak inhibitors of NADP+-specific isocitrate dehydrogenase (threo-DS-isocitrate:NADP+ oxidoreductase (decarboxylating), EC 1.1.1.42)9 Together, however, they act in a concerted manner and strongly inhibit the enzyme. The rates of formation and dissociation of the enzyme inhibitor complex, and the rate of formation and the stability of the aldol condensation product of oxalacetate and glyoxylate, oxalomalate, were examined. The data obtained do not support the often suggested possibility that oxalomalate, per se, formed non-enzymatically in isocitrate dehydrogenase assay mixtures containing oxalacetate and glyoxylate, is responsible for the observed inhibition of the enzyme. Rather, the data presented in this communication suggest that oxalacetate binds to the enzyme first, and that the subsequent binding of glyoxylate leads to the formation of a catalytically inactive enzyme-inhibitor complex. | Concerted inhibition of NADP+-specific isocitrate dehydrogenase by oxalacetate and glyoxylate. I. Oxalomalate formation and stability, and nature of the enzyme inhibition. Oxalacetate and glyoxylate are each weak inhibitors of NADP+-specific isocitrate dehydrogenase (threo-DS-isocitrate:NADP+ oxidoreductase (decarboxylating), EC 1.1.1.42)9 Together, however, they act in a concerted manner and strongly inhibit the enzyme. The rates of formation and dissociation of the enzyme inhibitor complex, and the rate of formation and the stability of the aldol condensation product of oxalacetate and glyoxylate, oxalomalate, were examined. The data obtained do not support the often suggested possibility that oxalomalate, per se, formed non-enzymatically in isocitrate dehydrogenase assay mixtures containing oxalacetate and glyoxylate, is responsible for the observed inhibition of the enzyme. Rather, the data presented in this communication suggest that oxalacetate binds to the enzyme first, and that the subsequent binding of glyoxylate leads to the formation of a catalytically inactive enzyme-inhibitor complex. | [
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|
PMID:18196 | Two aldehyde dehydrogenases from human liver. Isolation via affinity chromatography and characterization of the isozymes. | Human liver extracts show two major bands with aldehyde dehydrogenase (Aldehyde:NAD+ oxidoreductase, EC 1.2.1.3) activity via starch gel electrophoresis at pH 7.0. Both bands have been purified to apparent homogeneity via classical chromatography combined with affinity chromatography on 5'-AMP-Sepharose 4B. The slower migrating band, enzyme 1, when assayed at pH 9.5 has a low Km for NAD (8 micrometer) and a high Km for acetaldehyde (approx. 0.1 mM). It is very strongly inhibited by disulfiram at pH 7.0 with a Ki of 0.2 micrometer. The faster migrating band, enzyme 2, has a low Km for acetaldehyde, (2--3 micrometer at pH 9.5), a higher Km for NAD (70 micrometer at pH 9.5), and is not inhibited by disulfiram at pH 7.0. The two enzymes are very similar to the F1 and F2 isozymes of horse liver purified by Eckfeldt et al. (Eckfeldt, J., Mope, L., Takio, K. and Yonetani, T. (1976) J. Biol, Chem. 251, 236-240) in molecular weight, subunit composition, amino acid composition and extinction coefficient. Preliminary kinetic characterizations of the enzyme are presented. | Two aldehyde dehydrogenases from human liver. Isolation via affinity chromatography and characterization of the isozymes. Human liver extracts show two major bands with aldehyde dehydrogenase (Aldehyde:NAD+ oxidoreductase, EC 1.2.1.3) activity via starch gel electrophoresis at pH 7.0. Both bands have been purified to apparent homogeneity via classical chromatography combined with affinity chromatography on 5'-AMP-Sepharose 4B. The slower migrating band, enzyme 1, when assayed at pH 9.5 has a low Km for NAD (8 micrometer) and a high Km for acetaldehyde (approx. 0.1 mM). It is very strongly inhibited by disulfiram at pH 7.0 with a Ki of 0.2 micrometer. The faster migrating band, enzyme 2, has a low Km for acetaldehyde, (2--3 micrometer at pH 9.5), a higher Km for NAD (70 micrometer at pH 9.5), and is not inhibited by disulfiram at pH 7.0. The two enzymes are very similar to the F1 and F2 isozymes of horse liver purified by Eckfeldt et al. (Eckfeldt, J., Mope, L., Takio, K. and Yonetani, T. (1976) J. Biol, Chem. 251, 236-240) in molecular weight, subunit composition, amino acid composition and extinction coefficient. Preliminary kinetic characterizations of the enzyme are presented. | [
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|
PMID:18197 | Purification and some properties of gamma-glutamyltransferase from human liver. | The purification of gamma-glutamyltransferase ((gamma-glutamyl)-peptide: amino acid gamma-glutamyltransferase, EC 2.3.2.2) from normal human liver is described. The procedure includes solubilization of enzyme from membranes using deoxycholate and Lubrol W, treatment with acetone and butanol, and affinity chromatography on immobilized concanavalin A. Treatment with papain was used to release the enzyme from aggregates of lipid and protein, prior to further purification. On overall purification of 9400 was achieved and analytical polyacrylamide gel electrophoresis indicated that the final product was homogeneous, and had a molecular weight of 110 000. Two subunits were identified on dodecyl sulfate gel electrophoresis with estimated molecular weights of 47 000 and 22 000. The kinetic properties studied for the purified enzyme were similar to those found for partially purified (not papain-treated) enzyme, and resembled those of serum gamma-glutamyltransferase. The true KM values for the liver enzyme were estimated to 0.81 mM for gamma-glutamyl-p-nitroanilide and to 12.4 mM for glycyl-glycine. | Purification and some properties of gamma-glutamyltransferase from human liver. The purification of gamma-glutamyltransferase ((gamma-glutamyl)-peptide: amino acid gamma-glutamyltransferase, EC 2.3.2.2) from normal human liver is described. The procedure includes solubilization of enzyme from membranes using deoxycholate and Lubrol W, treatment with acetone and butanol, and affinity chromatography on immobilized concanavalin A. Treatment with papain was used to release the enzyme from aggregates of lipid and protein, prior to further purification. On overall purification of 9400 was achieved and analytical polyacrylamide gel electrophoresis indicated that the final product was homogeneous, and had a molecular weight of 110 000. Two subunits were identified on dodecyl sulfate gel electrophoresis with estimated molecular weights of 47 000 and 22 000. The kinetic properties studied for the purified enzyme were similar to those found for partially purified (not papain-treated) enzyme, and resembled those of serum gamma-glutamyltransferase. The true KM values for the liver enzyme were estimated to 0.81 mM for gamma-glutamyl-p-nitroanilide and to 12.4 mM for glycyl-glycine. | [
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|
PMID:18198 | Partial purification and some properties of gamma-glutamyl transpeptidase from human bile. | 1. Gamma-Glutamyl transpepetidase ((5-glutamyl)-peptide: amino acid 5-glutamyltransferase, EC 2.3.2.2) from human bile has been partially purified using protamine sulphate treatment, DEAE-cellulose chromatography and Sephadex G-200 filtration. The procedure resulted in 150-fold increase in specific acitivity with a 37% yield. 2. The partially purified enzyme showed a single zone of enzyme activity by polyacrylamide gel electrophoresis and eluted in the inner volume of Sephadex G-200. 3. The enzyme had a pH optimum of 8.1 and Km of 1.52 mM using gamma-glutamyl p-nitroanilide as substrate. 4. The effects of cations and different gamma-glutamyl acceptors on the activity of the enzyme are reported. 5. As bile gamma-glutamyl transpeptidase appears to be soluble in the absence of detergents, it is suggested that bile may prove to be a useful source for further studies of the kinetic properties and physiological role of human gamma-glutamyl transpeptidase. | Partial purification and some properties of gamma-glutamyl transpeptidase from human bile. 1. Gamma-Glutamyl transpepetidase ((5-glutamyl)-peptide: amino acid 5-glutamyltransferase, EC 2.3.2.2) from human bile has been partially purified using protamine sulphate treatment, DEAE-cellulose chromatography and Sephadex G-200 filtration. The procedure resulted in 150-fold increase in specific acitivity with a 37% yield. 2. The partially purified enzyme showed a single zone of enzyme activity by polyacrylamide gel electrophoresis and eluted in the inner volume of Sephadex G-200. 3. The enzyme had a pH optimum of 8.1 and Km of 1.52 mM using gamma-glutamyl p-nitroanilide as substrate. 4. The effects of cations and different gamma-glutamyl acceptors on the activity of the enzyme are reported. 5. As bile gamma-glutamyl transpeptidase appears to be soluble in the absence of detergents, it is suggested that bile may prove to be a useful source for further studies of the kinetic properties and physiological role of human gamma-glutamyl transpeptidase. | [
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|
PMID:18199 | Reversible modification of amino groups in aspartate aminotransferase. | Amino groups in the pyridoxal phosphate, pyridoxamine phosphate, and apo forms of pig heart cytoplasmic aspartate aminotransferase (L-aspartate: 2-oxoglutarate aminotransferase, EC .2.6.1.1) have been reversibly modified with 2,4-pentanedione. The rate of modification has been measured spectrophotometrically by observing the formation of the enamine produced and this rate has been compared with the rate of loss of catalytic activity for all three forms of the enzyme. Of the 21 amino groups per 46 500 molecular weight, approx. 16 can be modified in the pyridoxal phosphate form with less than a 50% change in the catalytic activity of the enzyme. A slow inactivation occurs which is probably due to reaction of 2,4-pentanedione with the enzyme-bound pyridoxal phosphate. The pyridoxamine phosphate enzyme is completely inactivated by reaction with 2,4-pentanedione. The inactivation of the pyridoxamine phosphate enzyme is not inhibited by substrate analogs. A single lysine residue in the apoenzyme reacts approx. 100 times faster with 2,4-pentanedione than do other amino groups. This lysine is believed to be lysine-258, which forms a Schiff base with pyridoxal phosphate in the holoenzyme. | Reversible modification of amino groups in aspartate aminotransferase. Amino groups in the pyridoxal phosphate, pyridoxamine phosphate, and apo forms of pig heart cytoplasmic aspartate aminotransferase (L-aspartate: 2-oxoglutarate aminotransferase, EC .2.6.1.1) have been reversibly modified with 2,4-pentanedione. The rate of modification has been measured spectrophotometrically by observing the formation of the enamine produced and this rate has been compared with the rate of loss of catalytic activity for all three forms of the enzyme. Of the 21 amino groups per 46 500 molecular weight, approx. 16 can be modified in the pyridoxal phosphate form with less than a 50% change in the catalytic activity of the enzyme. A slow inactivation occurs which is probably due to reaction of 2,4-pentanedione with the enzyme-bound pyridoxal phosphate. The pyridoxamine phosphate enzyme is completely inactivated by reaction with 2,4-pentanedione. The inactivation of the pyridoxamine phosphate enzyme is not inhibited by substrate analogs. A single lysine residue in the apoenzyme reacts approx. 100 times faster with 2,4-pentanedione than do other amino groups. This lysine is believed to be lysine-258, which forms a Schiff base with pyridoxal phosphate in the holoenzyme. | [
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|
PMID:18200 | Purification and properties of a triacylglycerol lipase from Mycobacterium phlei. | In order to study the metabolism of triacylglycerol in mycobacteria, an intracellular particulate triacylglycerol lipase (EC 3.1.1.3) was purified 800-fold from stationary phase cells of Mycobacterium phlei. Extraction of whole cell suspensions with 5% Triton X-100, followed by ion-exchange chromatography of the extract on two successive DEAE-cellulose columns produced a preparation which was nearly homogeneous by the criterion of analytical isoelectric focusing in acrylamide gels (one band, pI. 3.8) and by polyacrylamide gel electrophoresis. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis resolved the preparation into six protein bands. Lipase activity stable to electrophoresis in sodium dodecyl sulfate was extracted from the 40 000 molecular weight region of the gels. ith phosphate or maleate buffer the enzyme exhibits a broad pH optimum around 6.0 with sigmoid saturation kinetics (Hill number 2), and an apparent Km of 8.8 mM for tripalmitoylglycerol. Citrate and other carboxylic acids increase the apparent V up to 3-fold with the Hill number approaching 1.0. In a series of p-nitrophenyl esters tested (C2-C18), p-nitrophenylmyristate was hydrolyzed most rapidly. The saturation curve for p=nitrophenylmyristate was sigmoid and unaffected by citrate. The role of this activity in the metabolism of triacylglycerols by Mycobacteria is discussed. | Purification and properties of a triacylglycerol lipase from Mycobacterium phlei. In order to study the metabolism of triacylglycerol in mycobacteria, an intracellular particulate triacylglycerol lipase (EC 3.1.1.3) was purified 800-fold from stationary phase cells of Mycobacterium phlei. Extraction of whole cell suspensions with 5% Triton X-100, followed by ion-exchange chromatography of the extract on two successive DEAE-cellulose columns produced a preparation which was nearly homogeneous by the criterion of analytical isoelectric focusing in acrylamide gels (one band, pI. 3.8) and by polyacrylamide gel electrophoresis. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis resolved the preparation into six protein bands. Lipase activity stable to electrophoresis in sodium dodecyl sulfate was extracted from the 40 000 molecular weight region of the gels. ith phosphate or maleate buffer the enzyme exhibits a broad pH optimum around 6.0 with sigmoid saturation kinetics (Hill number 2), and an apparent Km of 8.8 mM for tripalmitoylglycerol. Citrate and other carboxylic acids increase the apparent V up to 3-fold with the Hill number approaching 1.0. In a series of p-nitrophenyl esters tested (C2-C18), p-nitrophenylmyristate was hydrolyzed most rapidly. The saturation curve for p=nitrophenylmyristate was sigmoid and unaffected by citrate. The role of this activity in the metabolism of triacylglycerols by Mycobacteria is discussed. | [
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|
PMID:18201 | Partial purification and characterization of a triacyglycerol lipase from rat liver cytosol. | A triacyglycerol lipase (EC 3.1.1.3) was purifiec about 60-fold from rat liver cytosol by delipidation with acetone and ethyl ether, hydroxyapatitie and Sephadex G-100 column chromatographies and isoelectrofocusing electrophoresis. The partially purified enzyme had a molecular weight of approximately 42 000 and an isolectric point of 7.2. The Km for trioleylglycerol was 0.33 mM and the pH optimum was around 8.0. The activity of the enzyme was not dependent on serum lipoproteins, but was stimulated about 2-fold by several proteins such as serum albumin, lipoproteins, gamma-globulin and ovalbumin. The lipase hydrolyzed trioleyglycerol to oleic acid and glycerol. NaCl had no effect on the enzymatic activity. Some physical and kinetic properties of the partially purified lipid-free lipase were different from those of crude non-delipidated lipase and also from those of a neutral triacylglycerol lipase which was recently purified partially from pig liver cytosol (Ledford, J.H. and Alaupovic, P. (1975) Biochim. Biophys. Acta 398, 132-148). | Partial purification and characterization of a triacyglycerol lipase from rat liver cytosol. A triacyglycerol lipase (EC 3.1.1.3) was purifiec about 60-fold from rat liver cytosol by delipidation with acetone and ethyl ether, hydroxyapatitie and Sephadex G-100 column chromatographies and isoelectrofocusing electrophoresis. The partially purified enzyme had a molecular weight of approximately 42 000 and an isolectric point of 7.2. The Km for trioleylglycerol was 0.33 mM and the pH optimum was around 8.0. The activity of the enzyme was not dependent on serum lipoproteins, but was stimulated about 2-fold by several proteins such as serum albumin, lipoproteins, gamma-globulin and ovalbumin. The lipase hydrolyzed trioleyglycerol to oleic acid and glycerol. NaCl had no effect on the enzymatic activity. Some physical and kinetic properties of the partially purified lipid-free lipase were different from those of crude non-delipidated lipase and also from those of a neutral triacylglycerol lipase which was recently purified partially from pig liver cytosol (Ledford, J.H. and Alaupovic, P. (1975) Biochim. Biophys. Acta 398, 132-148). | [
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|
PMID:18202 | Characteristics of a cytochrome P-450-dependent fatty acid omega-2 hydroxylase from bacillus megaterium. | The fatty acid (omega-2) hydroxylase from Bacillus megaterium ATCC 14581 was examined with respect to some general enzymatic properties attributed to an intact complex isolated in a partially purified state. Hydroxylase specific activity was found to increase with increasing protein concentration in a manner consistent with a reversible association of the components in the complex. There was a substantial kinetic lag phase for palmitate hydroxylation which was abolished by a substrate preincubation in the absence of NADPH. The substrate bound and presumably activated the hydroxylase complex without the formation of a substrate-derived intermediated. The oxidation of NADPH and the hydroxylation of palmitate were found to occur in a one to one molar ration, independent of the protein concentration. Finally, a cytochrome P-450 component of the complex was identified on the basis of its CO-binding difference spectrum. It appears, that this cytochrome P-450 component is not identical to P-450 meg of the steroid hydroxylase system of B. megaterium ATCC 13368, since progesterone, an active substrate for the latter, is not hydroxylated by the preparation from B. megaterium ATCC 14581. | Characteristics of a cytochrome P-450-dependent fatty acid omega-2 hydroxylase from bacillus megaterium. The fatty acid (omega-2) hydroxylase from Bacillus megaterium ATCC 14581 was examined with respect to some general enzymatic properties attributed to an intact complex isolated in a partially purified state. Hydroxylase specific activity was found to increase with increasing protein concentration in a manner consistent with a reversible association of the components in the complex. There was a substantial kinetic lag phase for palmitate hydroxylation which was abolished by a substrate preincubation in the absence of NADPH. The substrate bound and presumably activated the hydroxylase complex without the formation of a substrate-derived intermediated. The oxidation of NADPH and the hydroxylation of palmitate were found to occur in a one to one molar ration, independent of the protein concentration. Finally, a cytochrome P-450 component of the complex was identified on the basis of its CO-binding difference spectrum. It appears, that this cytochrome P-450 component is not identical to P-450 meg of the steroid hydroxylase system of B. megaterium ATCC 13368, since progesterone, an active substrate for the latter, is not hydroxylated by the preparation from B. megaterium ATCC 14581. | [
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|
PMID:18203 | Influence of hydrogen bonding on the rotamer distribution of the histidine side chain in peptides: 1H NMR and CD studies. | Both 1H NMR and circular dichroism pH titration studies on histidine, His-Gly, Gly-His and Gly-His-Gly indicate that the side-chain spatial orientation depends strongly on the vicinal charges. The arrangement of the imidazole side-chain (rotamer population) is shown by the histidine beta and beta' and the glycine methylene proton chemical shifts as well as the vicinal 1H-1H coupling constants 3JCalpha-H-beta-H, beta'-H. For His-Gly and Gly-His-Gly a good correlation can be found between the ionization of the glycine COOH group and the increase of rotamer III (g-g) which is also visualized by circular dichroism through an enhancement of the ellipticity at 212 nm. In these two peptides a hydrogen bond between the imidazolium and the carboxylate group is supposed to stabilize rotamer III at pH 4-5. | Influence of hydrogen bonding on the rotamer distribution of the histidine side chain in peptides: 1H NMR and CD studies. Both 1H NMR and circular dichroism pH titration studies on histidine, His-Gly, Gly-His and Gly-His-Gly indicate that the side-chain spatial orientation depends strongly on the vicinal charges. The arrangement of the imidazole side-chain (rotamer population) is shown by the histidine beta and beta' and the glycine methylene proton chemical shifts as well as the vicinal 1H-1H coupling constants 3JCalpha-H-beta-H, beta'-H. For His-Gly and Gly-His-Gly a good correlation can be found between the ionization of the glycine COOH group and the increase of rotamer III (g-g) which is also visualized by circular dichroism through an enhancement of the ellipticity at 212 nm. In these two peptides a hydrogen bond between the imidazolium and the carboxylate group is supposed to stabilize rotamer III at pH 4-5. | [
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|
PMID:18204 | Formation of a complex between yeast L-lactate dehydrogenase (cytochrome b2) and cytochrome c. Ultracentrifugal and gel chromatographic analyses. | Yeast L-lactate dehydrogenase formed a stable complex with cytochrome c in weakly alkaline solution of low ionic strength. The binding ratio of cytochrome c to the enzyme depended on whether free cytochrome c was present: In the presence of a micromolar concentration of cytochrome c the enzyme formed a complex with about two molecules of cytochrome c, whereas the enzyme was in a 1:1 molecular complex after removal of free cytochrome c. This suggests that the binding of one molecule of cytochrome c changes the affinity of the other binding site on the enzyme for cytochrome c. The enzyme consists of four presumably identical subunits, each containing a binding site for cytochrome c. Thus, present data confirm the concept of negative cooperativity between the subunits of the enzyme molecule in their interaction with cytochrome c. | Formation of a complex between yeast L-lactate dehydrogenase (cytochrome b2) and cytochrome c. Ultracentrifugal and gel chromatographic analyses. Yeast L-lactate dehydrogenase formed a stable complex with cytochrome c in weakly alkaline solution of low ionic strength. The binding ratio of cytochrome c to the enzyme depended on whether free cytochrome c was present: In the presence of a micromolar concentration of cytochrome c the enzyme formed a complex with about two molecules of cytochrome c, whereas the enzyme was in a 1:1 molecular complex after removal of free cytochrome c. This suggests that the binding of one molecule of cytochrome c changes the affinity of the other binding site on the enzyme for cytochrome c. The enzyme consists of four presumably identical subunits, each containing a binding site for cytochrome c. Thus, present data confirm the concept of negative cooperativity between the subunits of the enzyme molecule in their interaction with cytochrome c. | [
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|
PMID:18206 | Conformation of hyaluronate in neutral and alkaline solutions. | Increasing the pH of a neutral salt solution of sodium hyaluronate to 12.5 produces a rapid drop in viscosity which is reversible upon restoring the pH to neutrality. Light scattering data showing a decrease in radius of gyration with no change in molecular weight and negative results with chondroitin and other acidic glycosaminoglycans suggest that the conformational change is specific for hyaluronate molecules. | Conformation of hyaluronate in neutral and alkaline solutions. Increasing the pH of a neutral salt solution of sodium hyaluronate to 12.5 produces a rapid drop in viscosity which is reversible upon restoring the pH to neutrality. Light scattering data showing a decrease in radius of gyration with no change in molecular weight and negative results with chondroitin and other acidic glycosaminoglycans suggest that the conformational change is specific for hyaluronate molecules. | [
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|
PMID:18207 | Cyclic AMP-dependent control of the rat hepatic glutathione disulfide-sulfhydryl ratio. | The disulfide-sulfhydryl ratio of rat hepatic tissue has been found to vary diurnally lowest in the early morning and highest in the early evening (Isaacs, J. (1976) Fed. Proc. 35, 1472, and Isaacs, J. and Binkley, F. (1977) Biochim. Biophys. Acta 497, 192-204). Intraperitoneal injections of dibutyryl cyclic AMP induces an increase in hepatic glutathione protein mixed disulfides (GSSProt) combined with a corresponding decrease in reduced glutathione (GSH) and protein sulfhydryl (ProtSH). Also, dibutyryl cyclic AMP caused hepatic catalase activity to decrease and to increase hepatic production of peroxide molecules. A decrease in catalase activity directs more of the increased peroxide into the glutathione peroxidase pathway. This leads to increased amounts of oxidized glutathione (GSSG) which ultimately results in increased levels of GSSProt. Therefore cyclic AMP may mediate its effect on the disulfide-sulfhydryl ratio via control over catalase and peroxide generation. Support for this idea is provided by the close temporal correlation between the diurnal variations in cyclic AMP, hepatic catalase, peroxide generation and GSSProt-GSH levels. | Cyclic AMP-dependent control of the rat hepatic glutathione disulfide-sulfhydryl ratio. The disulfide-sulfhydryl ratio of rat hepatic tissue has been found to vary diurnally lowest in the early morning and highest in the early evening (Isaacs, J. (1976) Fed. Proc. 35, 1472, and Isaacs, J. and Binkley, F. (1977) Biochim. Biophys. Acta 497, 192-204). Intraperitoneal injections of dibutyryl cyclic AMP induces an increase in hepatic glutathione protein mixed disulfides (GSSProt) combined with a corresponding decrease in reduced glutathione (GSH) and protein sulfhydryl (ProtSH). Also, dibutyryl cyclic AMP caused hepatic catalase activity to decrease and to increase hepatic production of peroxide molecules. A decrease in catalase activity directs more of the increased peroxide into the glutathione peroxidase pathway. This leads to increased amounts of oxidized glutathione (GSSG) which ultimately results in increased levels of GSSProt. Therefore cyclic AMP may mediate its effect on the disulfide-sulfhydryl ratio via control over catalase and peroxide generation. Support for this idea is provided by the close temporal correlation between the diurnal variations in cyclic AMP, hepatic catalase, peroxide generation and GSSProt-GSH levels. | [
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|
PMID:18208 | Effects of guanosine on insulin secretion and adenylyl and guanylyl cyclase activities of isolated rat islets of Langerhans. | The effect of guanosine on insulin secretion, adenylyl and guanylyl cyclase activities of isolated rat islets of Langerhans was investigated. Guanosine (1-100 micron) inhibited glucose, tolbutamide, theophylline and prostaglandin E2-stimulated insulin secretion although it failed to affect glucagon stimulated secretion. Prostaglandin E2-stimulated adenylyl cyclase activity of islets was inhibited by guanosine although guanosine had no effect on basal, fluoride, glucagon or GTP-stimulated activity. Guanosine markedly decreased basal guanylyl cyclase activity of islets. These results suggest that guanosine may affect insulin release by inhibiting adenylyl and guanylyl cyclase activities in the beta-cell thereby decreasing the intracellular concentrations of cyclic nucleotides. This effect may be important in modulating the secretory response of the islets to a variety of hormonal agents. | Effects of guanosine on insulin secretion and adenylyl and guanylyl cyclase activities of isolated rat islets of Langerhans. The effect of guanosine on insulin secretion, adenylyl and guanylyl cyclase activities of isolated rat islets of Langerhans was investigated. Guanosine (1-100 micron) inhibited glucose, tolbutamide, theophylline and prostaglandin E2-stimulated insulin secretion although it failed to affect glucagon stimulated secretion. Prostaglandin E2-stimulated adenylyl cyclase activity of islets was inhibited by guanosine although guanosine had no effect on basal, fluoride, glucagon or GTP-stimulated activity. Guanosine markedly decreased basal guanylyl cyclase activity of islets. These results suggest that guanosine may affect insulin release by inhibiting adenylyl and guanylyl cyclase activities in the beta-cell thereby decreasing the intracellular concentrations of cyclic nucleotides. This effect may be important in modulating the secretory response of the islets to a variety of hormonal agents. | [
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|
PMID:18209 | Incorporation of mannose and glucose into prenylphosphate sugars in isolated human platelet membranes. | Isolated platelet membranes synthesize mannosylretinyl phosphate and dolichylmannosyl phosphate from GDP-[14C]mannose, but only dolichylglucosyl-phosphate is synthesized from UDP-[14C]glucose. Addition of exogenous retinylphosphate specifically stimulates the biosynthesis of mannosylretinylphosphate. | Incorporation of mannose and glucose into prenylphosphate sugars in isolated human platelet membranes. Isolated platelet membranes synthesize mannosylretinyl phosphate and dolichylmannosyl phosphate from GDP-[14C]mannose, but only dolichylglucosyl-phosphate is synthesized from UDP-[14C]glucose. Addition of exogenous retinylphosphate specifically stimulates the biosynthesis of mannosylretinylphosphate. | [
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|
PMID:18210 | The reaction of superoxide radical with iron complexes of EDTA studied by pulse radiolysis. | The reactions of Fe3+-EDTA and Fe2+-EDTA with O2- and CO2- were investigated in the pH range 3.8--11.8. Around neutral pH O2- reduces Fe3+-EDTA with a rate constant which is pH dependent kpH 5.8--8.1 = 2 - 10(6)--5 - 10(5) M-1 - s-1. At higher pH values this reaction becomes much slower. The CO2- radical reduces Fe3+-EDTA with kpH 3.8--1- = 5 +/- 1 - 10(7) M-1 - s-1 independent of pH. At pH 9--11.8, Fe2+-EDTA forms a complex with O2- with kFe2+-EDTA + O2 = 2 - 10(6)--4 - 10(6) M-1 - s-1 which is pH dependent. We measured the spectrum of Fe2+-EDTA-O2- and calculated epsilon 290 over max = 6400 +/- 800 M-1 - cm-1 in air-saturated solutions. In O2-saturated solutions another species is formed with a rate constant of 7 +/- 2 s-1. This intermediate absorbs around 300 nm but we were not able to identify it. | The reaction of superoxide radical with iron complexes of EDTA studied by pulse radiolysis. The reactions of Fe3+-EDTA and Fe2+-EDTA with O2- and CO2- were investigated in the pH range 3.8--11.8. Around neutral pH O2- reduces Fe3+-EDTA with a rate constant which is pH dependent kpH 5.8--8.1 = 2 - 10(6)--5 - 10(5) M-1 - s-1. At higher pH values this reaction becomes much slower. The CO2- radical reduces Fe3+-EDTA with kpH 3.8--1- = 5 +/- 1 - 10(7) M-1 - s-1 independent of pH. At pH 9--11.8, Fe2+-EDTA forms a complex with O2- with kFe2+-EDTA + O2 = 2 - 10(6)--4 - 10(6) M-1 - s-1 which is pH dependent. We measured the spectrum of Fe2+-EDTA-O2- and calculated epsilon 290 over max = 6400 +/- 800 M-1 - cm-1 in air-saturated solutions. In O2-saturated solutions another species is formed with a rate constant of 7 +/- 2 s-1. This intermediate absorbs around 300 nm but we were not able to identify it. | [
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|
PMID:18211 | Interconversion of multiple forms of tyrosine aminotransferase in vitro and in vivo in cultured hepatoma cells. | Corticosteroid-induced tyrosine aminotransferase (EC 2.6.1.5) from cultured hepatoma cells was separated by carboxymethyl-Sephadex chromatography into three molecular forms resembling those described previously in the rat liver. Enzyme forms were isolated and used as purified substrates to examine their in vitro interconversion by various subcellular fractions. Isolated form III was converted to forms II and I, and isolated form II was converted to form I by the coarse particulate fraction sedimenting at 1000 X g. This activity was inhibited by the serine enzyme inhibitor phenylmethane sulfonyl fluoride or by raising the pH to 8.7. Conversion of enzyme forms in vitro in the opposite direction (I leads to II leads to III) could not be detected. The distribution of enzyme forms in vivo was examined by the use of experimental conditions that prevent their in vitro interconversion during cell extraction. Tyrosine aminotransferase extracted from cell subjected to various treatments that affect the rates of enzyme synthesis or degradation existed always predominantly as form III. It appears, therefore, that multiple forms of tyrosine aminotransferase are not related to the turnover of this enzyme in vivo. | Interconversion of multiple forms of tyrosine aminotransferase in vitro and in vivo in cultured hepatoma cells. Corticosteroid-induced tyrosine aminotransferase (EC 2.6.1.5) from cultured hepatoma cells was separated by carboxymethyl-Sephadex chromatography into three molecular forms resembling those described previously in the rat liver. Enzyme forms were isolated and used as purified substrates to examine their in vitro interconversion by various subcellular fractions. Isolated form III was converted to forms II and I, and isolated form II was converted to form I by the coarse particulate fraction sedimenting at 1000 X g. This activity was inhibited by the serine enzyme inhibitor phenylmethane sulfonyl fluoride or by raising the pH to 8.7. Conversion of enzyme forms in vitro in the opposite direction (I leads to II leads to III) could not be detected. The distribution of enzyme forms in vivo was examined by the use of experimental conditions that prevent their in vitro interconversion during cell extraction. Tyrosine aminotransferase extracted from cell subjected to various treatments that affect the rates of enzyme synthesis or degradation existed always predominantly as form III. It appears, therefore, that multiple forms of tyrosine aminotransferase are not related to the turnover of this enzyme in vivo. | [
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|
PMID:18212 | Studies of Zn(II) and Co(II) complexes of imidazole and n-methylimidazole with regard to the activity related ionization in carbonic anhydrase. | Mixed aquo-N-methylimidazole complexes of Co(II) have been studied as a function of pH to gain a fuller understanding of the metal-binding site in Co(II)-carbonic anhydrase. The inherent affinity of N-methylimidazole for Co(II) has been calculated along with a species distribution for the stepwise addition of ligand to the metal ion. From these studies, it is apparent that the occurrence of Zn(II) rather than Co(II) in native carbonic anhydrase can be explained by the stronger affinity of Zn(II) for imidazole and the preference of Zn(II) for a tetrahedral geometry as offered by the enzyme. Octahedral Co(II) fails to ionize metal bound water. However, at high pH, Co(II)-N-methylimidazole complexes interact directly with the hydroxide ion, generating species with visible spectra very similar to that of Co(II)-carbonic anhydrase. Tentative structures have been proposed for these species. | Studies of Zn(II) and Co(II) complexes of imidazole and n-methylimidazole with regard to the activity related ionization in carbonic anhydrase. Mixed aquo-N-methylimidazole complexes of Co(II) have been studied as a function of pH to gain a fuller understanding of the metal-binding site in Co(II)-carbonic anhydrase. The inherent affinity of N-methylimidazole for Co(II) has been calculated along with a species distribution for the stepwise addition of ligand to the metal ion. From these studies, it is apparent that the occurrence of Zn(II) rather than Co(II) in native carbonic anhydrase can be explained by the stronger affinity of Zn(II) for imidazole and the preference of Zn(II) for a tetrahedral geometry as offered by the enzyme. Octahedral Co(II) fails to ionize metal bound water. However, at high pH, Co(II)-N-methylimidazole complexes interact directly with the hydroxide ion, generating species with visible spectra very similar to that of Co(II)-carbonic anhydrase. Tentative structures have been proposed for these species. | [
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PMID:18213 | Interactions between alpha-amino acids and cobalt(II) bovine-carbonic anhydrase. | The results of a study on the interaction between cobalt(II) bovine carbonic anhydrase and the alpha-amino acids L(+) and D(-)alanine, glycine and betaine are reported. L(+)alanine and glycine have been found to have larger affinity for the enzyme than D(-)alanine whereas no sizable affinity is shown by betaine. The electronic spectra indicate that these systems are similar to that containing the acetate ion. Utilizing the inhibition properties of L(+)alanine at various pH an analysis of the species involved in the inhibition reaction is presented. | Interactions between alpha-amino acids and cobalt(II) bovine-carbonic anhydrase. The results of a study on the interaction between cobalt(II) bovine carbonic anhydrase and the alpha-amino acids L(+) and D(-)alanine, glycine and betaine are reported. L(+)alanine and glycine have been found to have larger affinity for the enzyme than D(-)alanine whereas no sizable affinity is shown by betaine. The electronic spectra indicate that these systems are similar to that containing the acetate ion. Utilizing the inhibition properties of L(+)alanine at various pH an analysis of the species involved in the inhibition reaction is presented. | [
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|
PMID:18214 | Circularly polarized emission studies on Tb3+ and Eu3+ complexes with potentially terdentate amino acids in aqueous solution. | Circularly polarized emission (CPE) and total emission (TE) spectra are reported for Eu3+ and Tb3+ complexes of L-aspartic acid (L-asp), L-serine (L-ser), L-threonine (L-thr) and L-histidine (L-his) in D2O solution under various pH conditions. Variations in TE and CPE intensities and in CPE splittings and sign patterns as functions of solution pH are correlated with lanthanide ion/ligand binding characteristics and with structural changes in the coordination environment of the metal ion. In the Eu3+/amino acid systems, the emission bands associated with the 5D0 leads to 7F1 and 7F2 Eu3+ transitions are monitored, and in the Tb3+/amino acid systems the 5D4 leads to 7F5 Tb3+ emission is examined. | Circularly polarized emission studies on Tb3+ and Eu3+ complexes with potentially terdentate amino acids in aqueous solution. Circularly polarized emission (CPE) and total emission (TE) spectra are reported for Eu3+ and Tb3+ complexes of L-aspartic acid (L-asp), L-serine (L-ser), L-threonine (L-thr) and L-histidine (L-his) in D2O solution under various pH conditions. Variations in TE and CPE intensities and in CPE splittings and sign patterns as functions of solution pH are correlated with lanthanide ion/ligand binding characteristics and with structural changes in the coordination environment of the metal ion. In the Eu3+/amino acid systems, the emission bands associated with the 5D0 leads to 7F1 and 7F2 Eu3+ transitions are monitored, and in the Tb3+/amino acid systems the 5D4 leads to 7F5 Tb3+ emission is examined. | [
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|
PMID:18215 | Heavy metal-nucleotide interactions. IX. Raman difference spectroscopic studies on the binding of CH3Hg(II) to 1-methylthymine, thymidine-5'-monophosphate, DNA models and native DNA. | Raman spectra have been obtained for dTMP and its complex with CH3Hg (II) in aqueous solution as a function of pH. Difference spectroscopy is employed to increase the sensitivity of the Raman technique. The binding reaction is essentially quantitative from pH 3 to 9, and the value of the equilibrium constant for CH3HgOH2+ + dThd in equilibrium CH3Hg(dThdH--1) + H30+ is estimated from intensity measurements to be 0.6 in reasonable agreement with an earlier value based upon uv spectrophotometric data. Binding is to N(3) with substitution of CH3Hg+ for the proton. A similar reaction occurs with 1-MeThy. Raman spectra for aqueous and crystalline 1-MeThy and for the complex CH3Hg(1-MeThyH--1) are reported. The spectrum of crystalline Hg(1-MeThyH--1)2, for which the crystal structure is known, also was obtained for comparison. Raman difference spectroscopy was used to confirm that CH3Hg (II) binds to N(3) of dTMP and N(1) of GMP at r = 0.2 (MeHg+: phosphate) ratios with mixtures of GMP + CMP + AMP + dTMP. In contrast, native calf thymus DNA does not appear to bind CH3Hg(II) at these sites at r = 0.15, although no significant amount of free CH3HgOH is present. With r = 0.3, extensive binding occurs both to the Thy and Gua bases. Raman difference spectroscopy is a valuable technique for studying the binding of ions and molecules to polynucleotides in moderately dilute aqueous solution. | Heavy metal-nucleotide interactions. IX. Raman difference spectroscopic studies on the binding of CH3Hg(II) to 1-methylthymine, thymidine-5'-monophosphate, DNA models and native DNA. Raman spectra have been obtained for dTMP and its complex with CH3Hg (II) in aqueous solution as a function of pH. Difference spectroscopy is employed to increase the sensitivity of the Raman technique. The binding reaction is essentially quantitative from pH 3 to 9, and the value of the equilibrium constant for CH3HgOH2+ + dThd in equilibrium CH3Hg(dThdH--1) + H30+ is estimated from intensity measurements to be 0.6 in reasonable agreement with an earlier value based upon uv spectrophotometric data. Binding is to N(3) with substitution of CH3Hg+ for the proton. A similar reaction occurs with 1-MeThy. Raman spectra for aqueous and crystalline 1-MeThy and for the complex CH3Hg(1-MeThyH--1) are reported. The spectrum of crystalline Hg(1-MeThyH--1)2, for which the crystal structure is known, also was obtained for comparison. Raman difference spectroscopy was used to confirm that CH3Hg (II) binds to N(3) of dTMP and N(1) of GMP at r = 0.2 (MeHg+: phosphate) ratios with mixtures of GMP + CMP + AMP + dTMP. In contrast, native calf thymus DNA does not appear to bind CH3Hg(II) at these sites at r = 0.15, although no significant amount of free CH3HgOH is present. With r = 0.3, extensive binding occurs both to the Thy and Gua bases. Raman difference spectroscopy is a valuable technique for studying the binding of ions and molecules to polynucleotides in moderately dilute aqueous solution. | [
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|
PMID:18216 | [Phospholipase of rat intestine: mode of action]. | Phospholipase activities of rat intestinal mucosa homogenate have been determined from lysophosphatidylcholines [14C] and phosphatidylcholines [-3H-14C]. In the presence of phosphatidylcholines, at pH 6.5, the homogenate has a phospholipase B activity. At pH 8.5, a phospholipase A2 activity was shown. In the presence of lysophospatidylcholines, at pH 6.5, we notice a lysophospholipase A1 activity. A kinetic study of the reactions allows us to separate the activity B into a phospholipase A2 activity and a lysophospholipase A1 activity. Thus, it appears that the total phospholipase activity of rat intestinal mucosa would results from a phospholipase A2 activity and a lysophospholipase A1 activity. | [Phospholipase of rat intestine: mode of action]. Phospholipase activities of rat intestinal mucosa homogenate have been determined from lysophosphatidylcholines [14C] and phosphatidylcholines [-3H-14C]. In the presence of phosphatidylcholines, at pH 6.5, the homogenate has a phospholipase B activity. At pH 8.5, a phospholipase A2 activity was shown. In the presence of lysophospatidylcholines, at pH 6.5, we notice a lysophospholipase A1 activity. A kinetic study of the reactions allows us to separate the activity B into a phospholipase A2 activity and a lysophospholipase A1 activity. Thus, it appears that the total phospholipase activity of rat intestinal mucosa would results from a phospholipase A2 activity and a lysophospholipase A1 activity. | [
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|
PMID:18219 | Ionic permeability of K, Na, and Cl in crayfish nerve. Regulation by membrane fixed charges and pH. | Teorell's fixed charge theory for membrane ion permeability was utilized to calculate specific ionic permeabilities from measurements of membrane potential, conductance, and specific ionic transference numbers. The results were compared with the passive ionic conductances calculated from the branched equivalent circuit membrane model of Hodgkin Huxley. Ionic permeabilities for potassium, sodium, and chloride of crayfish (Procambarus clarkii) medial giant axons were examined over an external pH range from 3.8 to 11.4. Action potentials were obtained over this pH range. Failures occurred below pH 3.8 during protonation of membrane phospholipid phosphate and carboxyl, and above pH 11.4 from calcium precipitation. In general, chloride permeability increases with membrane protonation, while cation permeability decreases. At pH 7.0, PK = 1.33 X 10(-5), PCl = 1.49 X 10(-6), PNa = 1.92 X 10(-8) cm/s. PK: PCl: PNa = 693:78:1. PCl is zero above pH 10.6 and is opened predominately by protonation of epsilon-amino, and partially by tyrosine and sulfhydryl groups from pH 10.6 to 9. PK is activated in part by ionization of phospholipid phosphate and carboxyl around pH 4, then further by imidazole from pH 5 to 7, and then predominately from pH 7 to 9 by most probably phosphatidic acid. PNa permeability parallels that of potassium from pH 5 to 9.4. Below pH 5 and above pH 9.4, PNa increases while PK decreases. Evidence was obtained that these ions possibly share common passive permeable channels. The data best support the theory of Teorell, that membrane fixed charges regulate permiability and that essentially every membrane ionizable group appears involved in various amounts in ionic permeability control. | Ionic permeability of K, Na, and Cl in crayfish nerve. Regulation by membrane fixed charges and pH. Teorell's fixed charge theory for membrane ion permeability was utilized to calculate specific ionic permeabilities from measurements of membrane potential, conductance, and specific ionic transference numbers. The results were compared with the passive ionic conductances calculated from the branched equivalent circuit membrane model of Hodgkin Huxley. Ionic permeabilities for potassium, sodium, and chloride of crayfish (Procambarus clarkii) medial giant axons were examined over an external pH range from 3.8 to 11.4. Action potentials were obtained over this pH range. Failures occurred below pH 3.8 during protonation of membrane phospholipid phosphate and carboxyl, and above pH 11.4 from calcium precipitation. In general, chloride permeability increases with membrane protonation, while cation permeability decreases. At pH 7.0, PK = 1.33 X 10(-5), PCl = 1.49 X 10(-6), PNa = 1.92 X 10(-8) cm/s. PK: PCl: PNa = 693:78:1. PCl is zero above pH 10.6 and is opened predominately by protonation of epsilon-amino, and partially by tyrosine and sulfhydryl groups from pH 10.6 to 9. PK is activated in part by ionization of phospholipid phosphate and carboxyl around pH 4, then further by imidazole from pH 5 to 7, and then predominately from pH 7 to 9 by most probably phosphatidic acid. PNa permeability parallels that of potassium from pH 5 to 9.4. Below pH 5 and above pH 9.4, PNa increases while PK decreases. Evidence was obtained that these ions possibly share common passive permeable channels. The data best support the theory of Teorell, that membrane fixed charges regulate permiability and that essentially every membrane ionizable group appears involved in various amounts in ionic permeability control. | [
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PMID:18220 | Swelling of skinned muscle fibers of the frog. Experimental observations. | Frog skeletal muscle fibers, mechanically skinned under water-saturated silicone oil, swell upon transfer to aqueous relaxing medium (60 mM KCl; 3 mM MgCl(2); 3 mM ATP; 4 mM EGTA; 20 mM Tris maleate; pH = 7.0; ionic strength 0.15 M). Their cross-sectional areas, estimated with an elliptical approximation, increase 2.32-fold (+/-0.54 SD). Sarcomere spacing is unaffected by this swelling. Addition of 200 mM sucrose to relaxing medium had no effect on fiber dimensions, whereas decreasing pH to 5.0 caused fibers to shrink nearly to their original (oil) size. Decreasing MgCl(2) to 0.3 mM caused fibers to swell 10%, and increasing MgCl(2) to 9 mM led to an 8% shrinkage. Increasing ionic strength to 0.29 M with KCl caused a 26% increase in cross-sectional area; decreasing ionic strength to 0.09 M had no effect. Swelling pressure was estimated with long-chain polymers, which are probably excluded from the myofilament lattice. Shrinkage in dextran T10 (number average mol wt 6,200) was transient, indicating that this polymer may penetrate into the fibers. Shrinkage in dextran T40 (number average mol wt 28,000), polyvinylpyrrolidone (PVP) K30 (number average mol wt 40,000) and dextran T70 (number average mol wt 40,300) was not transient, indicating exclusion. Maximal calcium-activated tension is decreased by 21% in PVP solutions and by 31% in dextran T40 solutions. Fibers were shrunk to their original size with 8 x 10(-2) g/cm(3) PVP K30, a concentration which, from osmometric data, corresponds to an osmotic pressure (II/RT) of 10.5 mM. As discussed in the text, we consider this our best estimate of the swelling pressure. We find that increasing ionic strength to 0.39 M with KCl decreases swelling pressure slightly, whereas decreasing ionic strength to 0.09 M has no effect. We feel these data are consistent with the idea that swelling arises from the negatively charged nature of the myofilaments, from either mutual filamentary repulsion or a Donnan-osmotic mechanism. | Swelling of skinned muscle fibers of the frog. Experimental observations. Frog skeletal muscle fibers, mechanically skinned under water-saturated silicone oil, swell upon transfer to aqueous relaxing medium (60 mM KCl; 3 mM MgCl(2); 3 mM ATP; 4 mM EGTA; 20 mM Tris maleate; pH = 7.0; ionic strength 0.15 M). Their cross-sectional areas, estimated with an elliptical approximation, increase 2.32-fold (+/-0.54 SD). Sarcomere spacing is unaffected by this swelling. Addition of 200 mM sucrose to relaxing medium had no effect on fiber dimensions, whereas decreasing pH to 5.0 caused fibers to shrink nearly to their original (oil) size. Decreasing MgCl(2) to 0.3 mM caused fibers to swell 10%, and increasing MgCl(2) to 9 mM led to an 8% shrinkage. Increasing ionic strength to 0.29 M with KCl caused a 26% increase in cross-sectional area; decreasing ionic strength to 0.09 M had no effect. Swelling pressure was estimated with long-chain polymers, which are probably excluded from the myofilament lattice. Shrinkage in dextran T10 (number average mol wt 6,200) was transient, indicating that this polymer may penetrate into the fibers. Shrinkage in dextran T40 (number average mol wt 28,000), polyvinylpyrrolidone (PVP) K30 (number average mol wt 40,000) and dextran T70 (number average mol wt 40,300) was not transient, indicating exclusion. Maximal calcium-activated tension is decreased by 21% in PVP solutions and by 31% in dextran T40 solutions. Fibers were shrunk to their original size with 8 x 10(-2) g/cm(3) PVP K30, a concentration which, from osmometric data, corresponds to an osmotic pressure (II/RT) of 10.5 mM. As discussed in the text, we consider this our best estimate of the swelling pressure. We find that increasing ionic strength to 0.39 M with KCl decreases swelling pressure slightly, whereas decreasing ionic strength to 0.09 M has no effect. We feel these data are consistent with the idea that swelling arises from the negatively charged nature of the myofilaments, from either mutual filamentary repulsion or a Donnan-osmotic mechanism. | [
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|
PMID:18223 | Tyrosine fluorescence of two tryptophan-free proteins: histones H1 and H5. | The fluorescence intensity of the single tyrosine residue in histone H1 increases from RTYR = 0.3 to RTYR = 1.3 as the protein undergoes a conformational change from the random coil state to a folded form. Enhanced fluorescence in the folded state has not been observed before in ap protein. Histone H5 shows no change in fluorescence intensity on folding. This is interpreted as a result of compensation between enhanced and reduced fluorescence in the three tyrosine residues. | Tyrosine fluorescence of two tryptophan-free proteins: histones H1 and H5. The fluorescence intensity of the single tyrosine residue in histone H1 increases from RTYR = 0.3 to RTYR = 1.3 as the protein undergoes a conformational change from the random coil state to a folded form. Enhanced fluorescence in the folded state has not been observed before in ap protein. Histone H5 shows no change in fluorescence intensity on folding. This is interpreted as a result of compensation between enhanced and reduced fluorescence in the three tyrosine residues. | [
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|
PMID:18226 | Quantitative determination of enantiomeric compounds. I--Simultaneous measurement of the optical isomers of amphetamine in human plasma and saliva using chemical ionization mass spectrometry. | A sensitive and specific method for the quantitative determination of the optical isomers of amphetamine from human plasma and saliva is described. Amphetamine was extracted from basified plasma or saliva with hexane and then derivatized by reaction with N-pentafluorobenzoyl-S-(-)-prolyl-1-imidazolide. The reaction of the amphetamine enantiomers with this chiral reagent yields diasteriomers which are easily resolved by gas liquid chromatography. The resolved diasteriomers upon elution from the gas chromatograph were measured quantitatively by chemical ionization mass spectrometry. Plasma and saliva levels achieved following the oral administration of 10 mg of dl-, d- and l-amphetamine in man are reported. | Quantitative determination of enantiomeric compounds. I--Simultaneous measurement of the optical isomers of amphetamine in human plasma and saliva using chemical ionization mass spectrometry. A sensitive and specific method for the quantitative determination of the optical isomers of amphetamine from human plasma and saliva is described. Amphetamine was extracted from basified plasma or saliva with hexane and then derivatized by reaction with N-pentafluorobenzoyl-S-(-)-prolyl-1-imidazolide. The reaction of the amphetamine enantiomers with this chiral reagent yields diasteriomers which are easily resolved by gas liquid chromatography. The resolved diasteriomers upon elution from the gas chromatograph were measured quantitatively by chemical ionization mass spectrometry. Plasma and saliva levels achieved following the oral administration of 10 mg of dl-, d- and l-amphetamine in man are reported. | [
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|
PMID:18228 | Possible origin of gating current in nerve membrane. | The present information about gating current observed in squid giant axons points towards the distinct possibility of the current arising from the Debye relaxation of the carboxyl groups in the side chains of the globular proteins enclosing the ionic channels. These carboxyl groups form dipole chains stretching across the membrane. A dipole model is constructed to study the relaxation process under the assumption that the relaxation time tau of the dipoles is modified by dipole-dipole interaction. This model explains qualitatively some of the features of the asymmetric gating current, but is not indicative of any specific mechanism leading to the opening of the gates in the ionic channels. We speculate that the conformational change in the protein globules as a result of dipole reorientation would be the key to the mystery. | Possible origin of gating current in nerve membrane. The present information about gating current observed in squid giant axons points towards the distinct possibility of the current arising from the Debye relaxation of the carboxyl groups in the side chains of the globular proteins enclosing the ionic channels. These carboxyl groups form dipole chains stretching across the membrane. A dipole model is constructed to study the relaxation process under the assumption that the relaxation time tau of the dipoles is modified by dipole-dipole interaction. This model explains qualitatively some of the features of the asymmetric gating current, but is not indicative of any specific mechanism leading to the opening of the gates in the ionic channels. We speculate that the conformational change in the protein globules as a result of dipole reorientation would be the key to the mystery. | [
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|
PMID:18229 | Thermodynamics of the binding of flavin adenine dinucleotide to D-amino acid oxidase. | The enthalpy of binding, deltaHb, of flavin adenine dinucleotide to the apoenzyme of D-amino acid oxidase was determined by flow calorimetry at pH 8.5 to be +3.8, -4.1 and -11.0 kcal mol-1 at 10 degrees, 25 degrees and 38 degrees, respectively. These values correspond to a heat capacity change, deltaCp, of -530 cal K-1 mol-1. From the binding constant reported by Dixon and Kleppe (1965a) and the above enthalpies, the standard free energy and standard entropy of binding are evaluated. These thermodynamic data are interpreted in terms of hydrophobic and vibrational contributions (Sturtevant, 1977). The product of the assay reaction (Fonda and Anderson, 1967), benzoylformic acid, is a non-competitive inhibitor of the enzyme with a value for KI of 1.4 X 10(-4)M at 25 degrees. | Thermodynamics of the binding of flavin adenine dinucleotide to D-amino acid oxidase. The enthalpy of binding, deltaHb, of flavin adenine dinucleotide to the apoenzyme of D-amino acid oxidase was determined by flow calorimetry at pH 8.5 to be +3.8, -4.1 and -11.0 kcal mol-1 at 10 degrees, 25 degrees and 38 degrees, respectively. These values correspond to a heat capacity change, deltaCp, of -530 cal K-1 mol-1. From the binding constant reported by Dixon and Kleppe (1965a) and the above enthalpies, the standard free energy and standard entropy of binding are evaluated. These thermodynamic data are interpreted in terms of hydrophobic and vibrational contributions (Sturtevant, 1977). The product of the assay reaction (Fonda and Anderson, 1967), benzoylformic acid, is a non-competitive inhibitor of the enzyme with a value for KI of 1.4 X 10(-4)M at 25 degrees. | [
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|
PMID:18230 | Simultaneous peptide and oligonucleotide formation in mixtures of amino acid, nucleoside triphosphate, imidazole, and magnesium ion. | Simultaneous peptide and oligonucleotide formation was observed in reaction mixtures of amino acid, nucleoside triphosphate, imidazole, and MgCl2. At 70 degrees C in solutions that were evaporated to dryness the formation of peptide for phe and pro was greatest with CTP relative to ATP, GTP, and UTP. Lysine exhibited a preference for GTP and glycine for UTP. At ambient temperature insolution at pH 7.8, CTP was preferred by glycine, but at pH 8.7 UTP was preferred. The glycine nucleotide phosphoramidates were also detected and characterized in reactions at 40 degrees C. The glycine-reaction preference for CTP at pH 7.8 and UTP at 8.7 suggested that the basicity of the nucleoside triphosphate was involved in increasing the peptide yield. CTP near neutrality is the most basic nucleoside triphosphate and the basic anionic form UTP could facilitate peptide formation at pH 8.7. These data, together with information on the complexing of poly(C) by GTP, led to the experimentally approchable hypothesis that GTP, by forming a basic triplex between the cytosine residues adjacent to the peptidyl adenosine and aminoacyl adenosine at the termini of two proto-tRNAs, would promote peptide bond synthesis between the aminoacyl residue and peptidyl residue. | Simultaneous peptide and oligonucleotide formation in mixtures of amino acid, nucleoside triphosphate, imidazole, and magnesium ion. Simultaneous peptide and oligonucleotide formation was observed in reaction mixtures of amino acid, nucleoside triphosphate, imidazole, and MgCl2. At 70 degrees C in solutions that were evaporated to dryness the formation of peptide for phe and pro was greatest with CTP relative to ATP, GTP, and UTP. Lysine exhibited a preference for GTP and glycine for UTP. At ambient temperature insolution at pH 7.8, CTP was preferred by glycine, but at pH 8.7 UTP was preferred. The glycine nucleotide phosphoramidates were also detected and characterized in reactions at 40 degrees C. The glycine-reaction preference for CTP at pH 7.8 and UTP at 8.7 suggested that the basicity of the nucleoside triphosphate was involved in increasing the peptide yield. CTP near neutrality is the most basic nucleoside triphosphate and the basic anionic form UTP could facilitate peptide formation at pH 8.7. These data, together with information on the complexing of poly(C) by GTP, led to the experimentally approchable hypothesis that GTP, by forming a basic triplex between the cytosine residues adjacent to the peptidyl adenosine and aminoacyl adenosine at the termini of two proto-tRNAs, would promote peptide bond synthesis between the aminoacyl residue and peptidyl residue. | [
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|
PMID:18231 | Amperometric assay of coenzyme-dependent oxidoreductase enzymes in a flow-through cell. | We have demonstrated that a simple electrochemical cell can serve as a detector of NADH concentration in a flow system thereby providing an assay technique for NADH dependent enzymes. When this is applied to NADH produced by enzymatic reaction, then a reproducible measure of enzyme activity is obtained. This method of enzyme activity assay is applicable to a number of oxidoreductase enzymes which employ NAD+ or NADP+ as coenzymes to achieve substrate modification. The presence of electroactive species in samples of human serum has proved a serious problem in the electrochemical analysis of serum activity. These species produce a large background anode current at the anode voltage appropriate for NADH oxidation. The presence of this high current limits the usefulness of amplification of the current output to detect small changes in NADH concentration. | Amperometric assay of coenzyme-dependent oxidoreductase enzymes in a flow-through cell. We have demonstrated that a simple electrochemical cell can serve as a detector of NADH concentration in a flow system thereby providing an assay technique for NADH dependent enzymes. When this is applied to NADH produced by enzymatic reaction, then a reproducible measure of enzyme activity is obtained. This method of enzyme activity assay is applicable to a number of oxidoreductase enzymes which employ NAD+ or NADP+ as coenzymes to achieve substrate modification. The presence of electroactive species in samples of human serum has proved a serious problem in the electrochemical analysis of serum activity. These species produce a large background anode current at the anode voltage appropriate for NADH oxidation. The presence of this high current limits the usefulness of amplification of the current output to detect small changes in NADH concentration. | [
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|
PMID:18233 | Growth kinetics and cellulase biosynthesis in the continuous culture of Trichoderma viride. | Continuous culture studies have been carried out growing Trichoderma viride QM 9123 in a 10 liter stirred fermentor on a medium containing commercial glucose as the carbon source. Experiments were carried out at 30 degrees C and at three controlled pH values of 2.5, 3.0, and 4.0 over a range of dilution rates from 0.01 to 0.11 hr-1. Steady-state values of cell, glucose, and cellulase concentration oxygen tension, and outlet gas oxygen partial pressure were recorded. Values of maximum specific growth rate, endogenous metabolism coefficient, Michaelis-Menten coefficient, yield and maintenance coefficient for glucose were derived and correlated the effect of the hydrogen ion concentration. Specific oxygen uptake rates were correlated with specific growth rates and absorption coefficients were shown to be a function of dilution rate independent of pH. Some data on cellulase biosynthesis were examined and correlated in terms of a maturation time model. | Growth kinetics and cellulase biosynthesis in the continuous culture of Trichoderma viride. Continuous culture studies have been carried out growing Trichoderma viride QM 9123 in a 10 liter stirred fermentor on a medium containing commercial glucose as the carbon source. Experiments were carried out at 30 degrees C and at three controlled pH values of 2.5, 3.0, and 4.0 over a range of dilution rates from 0.01 to 0.11 hr-1. Steady-state values of cell, glucose, and cellulase concentration oxygen tension, and outlet gas oxygen partial pressure were recorded. Values of maximum specific growth rate, endogenous metabolism coefficient, Michaelis-Menten coefficient, yield and maintenance coefficient for glucose were derived and correlated the effect of the hydrogen ion concentration. Specific oxygen uptake rates were correlated with specific growth rates and absorption coefficients were shown to be a function of dilution rate independent of pH. Some data on cellulase biosynthesis were examined and correlated in terms of a maturation time model. | [
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|
PMID:18234 | [Tyrosine hydroxylase activation upon electric stimulation of isolated hypothalamic nerve endings in rats]. | The effect of electrical stimulation on the membrane-bound tyrosine hydroxylasectivity of the rat hypothalamus synaptosomes was studied. The electrical stimulation caused an elevation of O2 consumption and the elevation of glycolysis indicating synaptosome excitation. The membrane-bound tyrosine hydroxylase activity increased under these conditions. The KM value for tyrosine decreased from 0.091 to 0.026 mM. Noradrenaline inhibition of the enzymatic activity diminished. It is assumed that the effect of depolarization on the catecholamine synthesis velocity in the nerve endings involves tyrosine hydroxylase modification. | [Tyrosine hydroxylase activation upon electric stimulation of isolated hypothalamic nerve endings in rats]. The effect of electrical stimulation on the membrane-bound tyrosine hydroxylasectivity of the rat hypothalamus synaptosomes was studied. The electrical stimulation caused an elevation of O2 consumption and the elevation of glycolysis indicating synaptosome excitation. The membrane-bound tyrosine hydroxylase activity increased under these conditions. The KM value for tyrosine decreased from 0.091 to 0.026 mM. Noradrenaline inhibition of the enzymatic activity diminished. It is assumed that the effect of depolarization on the catecholamine synthesis velocity in the nerve endings involves tyrosine hydroxylase modification. | [
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|
PMID:18235 | [Regeneration of mammalial plantar skin]. | Two sole tubers of rat's hind leg were excised together with the surrounding skin and one of the hind tubers of hind and fore legs in hedgehogs were excised without the surrounding skin. During healing the skin wounds in rats and hedgehogs new skin proved to form with the papillary layer typical of the sole skin. In hedgehogs the new skin covered the regenerated sole tuber; in rats the sole tubers failed to regenerate. | [Regeneration of mammalial plantar skin]. Two sole tubers of rat's hind leg were excised together with the surrounding skin and one of the hind tubers of hind and fore legs in hedgehogs were excised without the surrounding skin. During healing the skin wounds in rats and hedgehogs new skin proved to form with the papillary layer typical of the sole skin. In hedgehogs the new skin covered the regenerated sole tuber; in rats the sole tubers failed to regenerate. | [
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|
PMID:18236 | [Ammonia formation in the brain during dying and in the recovery period following resuscitation]. | Dynamics of some nitrogen metabolism indices in the brain of dogs during dying and post-resuscitation period was studied in experiments on dogs. Glutamine proved to serve as the main source of ammonium hydrate in the brain during dying and clinical death. In the reconstruction period after revival of the organism glutamine was converted into ammonium eliminator, and the main sources of ammoniogenesis were labile amide protein groups. | [Ammonia formation in the brain during dying and in the recovery period following resuscitation]. Dynamics of some nitrogen metabolism indices in the brain of dogs during dying and post-resuscitation period was studied in experiments on dogs. Glutamine proved to serve as the main source of ammonium hydrate in the brain during dying and clinical death. In the reconstruction period after revival of the organism glutamine was converted into ammonium eliminator, and the main sources of ammoniogenesis were labile amide protein groups. | [
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|
PMID:18237 | [Demethylation of methindione]. | Methindion demethylation was shown to occur in rats. This process proceeds with the participation of NADPH-dependent transport system of microsomal electrons. In experiments in vivo methindion demethylation coursed at a high rate and was accompanied by a partial loss of its anticonvulsive effects. | [Demethylation of methindione]. Methindion demethylation was shown to occur in rats. This process proceeds with the participation of NADPH-dependent transport system of microsomal electrons. In experiments in vivo methindion demethylation coursed at a high rate and was accompanied by a partial loss of its anticonvulsive effects. | [
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|
PMID:18238 | [Inactivation of stem cells by allogenic lymphocytes: competition between T1- and T2-subpopulations]. | Transplantation of the bone marrow cells with allogeneic T-lymphocytes to the irradiated hosts was accompanied by inactivation of the stem elements of the graft. The lymph node cells of T-mice (those deprived of B cells) were more active than the spleen cells of these mice. The stem cells inactivation was weakly expressed or absent in case of a combined acti-n of T-cells from the lymph nodes and the spleen. | [Inactivation of stem cells by allogenic lymphocytes: competition between T1- and T2-subpopulations]. Transplantation of the bone marrow cells with allogeneic T-lymphocytes to the irradiated hosts was accompanied by inactivation of the stem elements of the graft. The lymph node cells of T-mice (those deprived of B cells) were more active than the spleen cells of these mice. The stem cells inactivation was weakly expressed or absent in case of a combined acti-n of T-cells from the lymph nodes and the spleen. | [
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|
PMID:18239 | Demonstration of hemopoietic stem cells in the peripheral blood of baboons by cross circulation. | Baboons were given 1200 R total body irradiation from two opposing 60Co sources. Three animals were given supportive therapy only and died, as expected, within 8 days of irradiation with profound marrow hypoplasia. Five baboons were cross-circulated with unirradiated partners and died within 14 days with evidence suggestive of graft-versus-host disease. Their marrows were repopulated with hemopoietic precursor cells, and three of the five had rises in peripheral white blood cell counts to more than 1500/cu mm before death. These results are compatible with the presence of hemopoietic stem cells in the peripheral blood of a nonhuman primate, the baboon. | Demonstration of hemopoietic stem cells in the peripheral blood of baboons by cross circulation. Baboons were given 1200 R total body irradiation from two opposing 60Co sources. Three animals were given supportive therapy only and died, as expected, within 8 days of irradiation with profound marrow hypoplasia. Five baboons were cross-circulated with unirradiated partners and died within 14 days with evidence suggestive of graft-versus-host disease. Their marrows were repopulated with hemopoietic precursor cells, and three of the five had rises in peripheral white blood cell counts to more than 1500/cu mm before death. These results are compatible with the presence of hemopoietic stem cells in the peripheral blood of a nonhuman primate, the baboon. | [
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|
PMID:18243 | Alterations in brain 5-hydroxytryptamine metabolism during the 'withdrawal' phase after chronic treatment with diazepam and bromazepam. | 1 Daily administration of diazepam or bromazepam (10 mg/kg) for 22 days significantly increased the activity of mid-brain tryptophan hydroxylase by 36% and 39%, respectively. The concentration of tryptophan was also enhanced in the mid-brain region of rats subjected to benzodiazepine treatment.2 Chronic therapy with either of the two anti-anxiety agents enhanced the endogenous levels of 5-hydroxytryptamine and 5-hydroxyindoleacetic acid in cerebral cortex, hypothalamus, pons-medulla, mid-brain and striatum.3 Whereas diazepam treatment decreased (13%) the activity of monoamine oxidase in mid-brain, bromazepam failed to exert any effect, suggesting that the observed elevation in 5-hydroxy-indoleacetic acid levels is not associated with enhanced deamination of 5-hydroxytryptamine.4 Discontinuation of treatment for 48 h significantly decreased the activity of mid-brain tryptophan hydroxylase to levels that were significantly lower than those seen for benzodiazepine-treated and normal rats. The concentrations of mid-brain tryptophan and 5-hydroxytryptamine were also reduced in various brain regions examined.5 Withdrawal from diazepam or bromazepam therapy further augmented the levels of brain 5-hydroxyindoleacetic acid.6 The results demonstrate that the depressant effects on behaviour of these agents are accompanied by increased metabolism of 5-hydroxytryptamine in the brain. Withdrawal from these minor tranquillizers, on the other hand, reduces the synthesis of this indoleamine. | Alterations in brain 5-hydroxytryptamine metabolism during the 'withdrawal' phase after chronic treatment with diazepam and bromazepam. 1 Daily administration of diazepam or bromazepam (10 mg/kg) for 22 days significantly increased the activity of mid-brain tryptophan hydroxylase by 36% and 39%, respectively. The concentration of tryptophan was also enhanced in the mid-brain region of rats subjected to benzodiazepine treatment.2 Chronic therapy with either of the two anti-anxiety agents enhanced the endogenous levels of 5-hydroxytryptamine and 5-hydroxyindoleacetic acid in cerebral cortex, hypothalamus, pons-medulla, mid-brain and striatum.3 Whereas diazepam treatment decreased (13%) the activity of monoamine oxidase in mid-brain, bromazepam failed to exert any effect, suggesting that the observed elevation in 5-hydroxy-indoleacetic acid levels is not associated with enhanced deamination of 5-hydroxytryptamine.4 Discontinuation of treatment for 48 h significantly decreased the activity of mid-brain tryptophan hydroxylase to levels that were significantly lower than those seen for benzodiazepine-treated and normal rats. The concentrations of mid-brain tryptophan and 5-hydroxytryptamine were also reduced in various brain regions examined.5 Withdrawal from diazepam or bromazepam therapy further augmented the levels of brain 5-hydroxyindoleacetic acid.6 The results demonstrate that the depressant effects on behaviour of these agents are accompanied by increased metabolism of 5-hydroxytryptamine in the brain. Withdrawal from these minor tranquillizers, on the other hand, reduces the synthesis of this indoleamine. | [
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|
PMID:18244 | Responses of the cardiovascular system of the rat to alpha-and beta-adrenoceptor agonists. | 1 The effects of intravenously infused phenylephrine and isoprenaline upon the cardiovascular system of the rat anaesthetized with pentobarbitone, have been investigated.2 Phenylephrine produces a dose-dependent rise in mean arterial blood pressure (MABP) that is due mainly to an increase in total peripheral vascular resistance (TPR), though at all doses tested cardiac output was invariably raised.3 The increase in cardiac output was due in each instance to an increase in stroke volume, heart rate being unchanged. This increase in cardiac output is probably brought about by effects of phenylephrine on the capacitance vessels rather than by an effect on the heart.4 Evidence is presented to show that the effects of phenylephrine are mediated largely by alpha-adrenoceptors, but that beta-adrenoceptors which affect TPR are also stimulated by the amine.5 Isoprenaline produces a dose-dependent fall in MABP that is due entirely to a fall in TPR since the cardiac output increases.6 Unlike phenylephrine, the increase in cardiac output obtained with isoprenaline was achieved by an increase in heart rate while stroke volume remained close to control values. It is contended that the augmented venous return required for the elevated cardiac output results in this case mainly from the isoprenaline-induced fall in TPR which enhances transfer of blood from arteries to the veins.7 Evidence is presented to show that the effects of isoprenaline are mediated mainly by beta-adrenoceptors.8 Under the present experimental conditions the adrenoceptor-mediated cardiovascular changes are little modified reflexly by the arterial baroreceptors. | Responses of the cardiovascular system of the rat to alpha-and beta-adrenoceptor agonists. 1 The effects of intravenously infused phenylephrine and isoprenaline upon the cardiovascular system of the rat anaesthetized with pentobarbitone, have been investigated.2 Phenylephrine produces a dose-dependent rise in mean arterial blood pressure (MABP) that is due mainly to an increase in total peripheral vascular resistance (TPR), though at all doses tested cardiac output was invariably raised.3 The increase in cardiac output was due in each instance to an increase in stroke volume, heart rate being unchanged. This increase in cardiac output is probably brought about by effects of phenylephrine on the capacitance vessels rather than by an effect on the heart.4 Evidence is presented to show that the effects of phenylephrine are mediated largely by alpha-adrenoceptors, but that beta-adrenoceptors which affect TPR are also stimulated by the amine.5 Isoprenaline produces a dose-dependent fall in MABP that is due entirely to a fall in TPR since the cardiac output increases.6 Unlike phenylephrine, the increase in cardiac output obtained with isoprenaline was achieved by an increase in heart rate while stroke volume remained close to control values. It is contended that the augmented venous return required for the elevated cardiac output results in this case mainly from the isoprenaline-induced fall in TPR which enhances transfer of blood from arteries to the veins.7 Evidence is presented to show that the effects of isoprenaline are mediated mainly by beta-adrenoceptors.8 Under the present experimental conditions the adrenoceptor-mediated cardiovascular changes are little modified reflexly by the arterial baroreceptors. | [
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|
PMID:18245 | Responses of the cardiovascular system of the rat to noradrenaline infusions and their modification by adrenoceptor blocking agents. | 1 The effects of noradrenaline upon the cardiovascular system of the rat, anaesthetized with pentobarbitone, have been investigated.2 Noradrenaline produces a dose-dependent increase in mean arterial blood pressure (MABP) which is due entirely to an increase in cardiac output; total peripheral vascular resistance (TPR) remains unchanged.3 Following beta-adrenoceptor blockade the pressor response to infused noradrenaline is enhanced and is now due mainly to an increase in TPR; the increment in cardiac output is reduced.4 After alpha-adrenoceptor blockade the pressor response is greatly reduced; the residual increase in MABP is due solely to an increase in cardiac output.5 After ganglion blockade resting cardiac output and TPR both fall, resulting in a reduction in MABP. The pressor response to noradrenaline is enhanced and is now due to increases in both TPR and in cardiac output.6 The cardiovascular response of the anaesthetized rat to noradrenaline can be explained in terms of classical alpha- and beta-adrenoceptor stimulation by the amine; the unusual form of the response may be due to an effective predominance of beta-adrenoceptor-mediated effects in this species.7 It is suggested that the failure of exogenous noradrenaline to produce a rise in TPR results from a balance between the alpha-adrenoceptor-mediated increase and beta-adrenoceptor-mediated decrease in this variable. However, this proposed balance is lost if resting vasoconstrictor tone is reduced by ganglion blockade. | Responses of the cardiovascular system of the rat to noradrenaline infusions and their modification by adrenoceptor blocking agents. 1 The effects of noradrenaline upon the cardiovascular system of the rat, anaesthetized with pentobarbitone, have been investigated.2 Noradrenaline produces a dose-dependent increase in mean arterial blood pressure (MABP) which is due entirely to an increase in cardiac output; total peripheral vascular resistance (TPR) remains unchanged.3 Following beta-adrenoceptor blockade the pressor response to infused noradrenaline is enhanced and is now due mainly to an increase in TPR; the increment in cardiac output is reduced.4 After alpha-adrenoceptor blockade the pressor response is greatly reduced; the residual increase in MABP is due solely to an increase in cardiac output.5 After ganglion blockade resting cardiac output and TPR both fall, resulting in a reduction in MABP. The pressor response to noradrenaline is enhanced and is now due to increases in both TPR and in cardiac output.6 The cardiovascular response of the anaesthetized rat to noradrenaline can be explained in terms of classical alpha- and beta-adrenoceptor stimulation by the amine; the unusual form of the response may be due to an effective predominance of beta-adrenoceptor-mediated effects in this species.7 It is suggested that the failure of exogenous noradrenaline to produce a rise in TPR results from a balance between the alpha-adrenoceptor-mediated increase and beta-adrenoceptor-mediated decrease in this variable. However, this proposed balance is lost if resting vasoconstrictor tone is reduced by ganglion blockade. | [
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|
PMID:18246 | Development of nicotinic responses in the rat adrenal medulla and long-term effects of neonatal nicotine administration. | 1. The development of nicotinic responses in the rat adrenal medulla was examined at various ages from 1 to 50 days of age by testing the ability of nicotine (10 mg/kg, s.c.) to deplete catecholamines and induce tyrosine hydroxylase. 2. Catecholamines were depleted 25% 3 h after injection of nicotine at all ages tested, but the degree of tyrosine hydroxylase induction 24 h after nicotine increased with age. 3. These data indicate that functional nicotinic receptors are present in the neonatal adrenal medulla before the development of functional splanchnic innervation, but that the development of the ability to induce tyrosine hydroxylase is not coupled directly to the development of secretory mechanisms. 4. The long-term effects of a single dose of nicotine (10 mg/kg, s.c.) administered to one day old rats were also examined. 5. After the short-term catecholamine depletion caused by nicotine, there were persistent elevations of catecholamines and tyrosine hydroxylase until 23 days of age; however, dopamine beta-hydroxylase remained elevated into young adulthood. 6. These data indicate that neonatal nicotine administration can produce long-term changes in adrenal catecholamine biosynthetic enzymes. | Development of nicotinic responses in the rat adrenal medulla and long-term effects of neonatal nicotine administration. 1. The development of nicotinic responses in the rat adrenal medulla was examined at various ages from 1 to 50 days of age by testing the ability of nicotine (10 mg/kg, s.c.) to deplete catecholamines and induce tyrosine hydroxylase. 2. Catecholamines were depleted 25% 3 h after injection of nicotine at all ages tested, but the degree of tyrosine hydroxylase induction 24 h after nicotine increased with age. 3. These data indicate that functional nicotinic receptors are present in the neonatal adrenal medulla before the development of functional splanchnic innervation, but that the development of the ability to induce tyrosine hydroxylase is not coupled directly to the development of secretory mechanisms. 4. The long-term effects of a single dose of nicotine (10 mg/kg, s.c.) administered to one day old rats were also examined. 5. After the short-term catecholamine depletion caused by nicotine, there were persistent elevations of catecholamines and tyrosine hydroxylase until 23 days of age; however, dopamine beta-hydroxylase remained elevated into young adulthood. 6. These data indicate that neonatal nicotine administration can produce long-term changes in adrenal catecholamine biosynthetic enzymes. | [
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|
PMID:18247 | Central mechanism of vasopressin-induced changes in antidiuretic hormone release. | 1. Intracerebroventricularly (i.c.v.) administered vasopressin (0.001-1.0 u) in dogs anaesthetized with chloralose produced adose-dependent increase in urine flow with a concomitant decrease in the levels of antidiuretic hormone (ADH) in jugular vein blood. 2. Higher doses of vasopressin (1.5-2.0 u, i.c.v) on the other hand had an antidiuretic effect and produced an increase in blood ADH level. 3. Pretreatment (i.c.v.) with a beta-adrenoceptor antagonist completely blocked the diuretic response of low doses of vasopressin (i.c.v.) but did not influence the antidiuretic response obtained with high doses. 4. Repeated administration of vasopressin (1.0 u, i.c.v.) induced tachyphylaxis; central catecholamine depletion with tetrabenazine significantly inhibited the vasopressin-induced diuretic response. 5. It is concluded that intracerebroventricular vasopressin-induced changes in ADH secretion are mediated through the release of catecholamines in the central nervous system. | Central mechanism of vasopressin-induced changes in antidiuretic hormone release. 1. Intracerebroventricularly (i.c.v.) administered vasopressin (0.001-1.0 u) in dogs anaesthetized with chloralose produced adose-dependent increase in urine flow with a concomitant decrease in the levels of antidiuretic hormone (ADH) in jugular vein blood. 2. Higher doses of vasopressin (1.5-2.0 u, i.c.v) on the other hand had an antidiuretic effect and produced an increase in blood ADH level. 3. Pretreatment (i.c.v.) with a beta-adrenoceptor antagonist completely blocked the diuretic response of low doses of vasopressin (i.c.v.) but did not influence the antidiuretic response obtained with high doses. 4. Repeated administration of vasopressin (1.0 u, i.c.v.) induced tachyphylaxis; central catecholamine depletion with tetrabenazine significantly inhibited the vasopressin-induced diuretic response. 5. It is concluded that intracerebroventricular vasopressin-induced changes in ADH secretion are mediated through the release of catecholamines in the central nervous system. | [
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PMID:18248 | Selectivity of blocking agents for pre-and postsynaptic alpha-adrenoceptors. | 1. Low frequency (0.1 Hz) electrical stimulation of the rat isolated vas deferens produced regular contractions that were inhibited by low concentrations of clonidine. 2. The inhibition of the vas deferens produced by clonidine was presynaptic in origin and involved alpha-adrenoceptors. 3. Presynaptic alpha-adrenoceptor antagonist activity was assessed by studying the effects of increasing concentrations of the antagonists on cumulative clonidine dose-response curves on the stimulated vas deferens. 4. Postsynaptic alpha-adrenoceptor antagonist activity was assessed by comparison of control cumulative noradrenaline dose-response curves with those in the presence of increasing concentrations of antagonists in the rat anococcygeus muscle. 5. The results indicate that yohimbine and phentolamine are more potent in blocking presynaptic than postsynaptic alpha-adrenoceptors. Phenoxybenzamine and prazosin block postsynaptic alpha-adrenoceptors preferentially. 6. The findings support the view that presynaptic and postsynaptic alpha-adrenoceptors differ in their sensitivity to alpha-adrenoceptor antagonists. | Selectivity of blocking agents for pre-and postsynaptic alpha-adrenoceptors. 1. Low frequency (0.1 Hz) electrical stimulation of the rat isolated vas deferens produced regular contractions that were inhibited by low concentrations of clonidine. 2. The inhibition of the vas deferens produced by clonidine was presynaptic in origin and involved alpha-adrenoceptors. 3. Presynaptic alpha-adrenoceptor antagonist activity was assessed by studying the effects of increasing concentrations of the antagonists on cumulative clonidine dose-response curves on the stimulated vas deferens. 4. Postsynaptic alpha-adrenoceptor antagonist activity was assessed by comparison of control cumulative noradrenaline dose-response curves with those in the presence of increasing concentrations of antagonists in the rat anococcygeus muscle. 5. The results indicate that yohimbine and phentolamine are more potent in blocking presynaptic than postsynaptic alpha-adrenoceptors. Phenoxybenzamine and prazosin block postsynaptic alpha-adrenoceptors preferentially. 6. The findings support the view that presynaptic and postsynaptic alpha-adrenoceptors differ in their sensitivity to alpha-adrenoceptor antagonists. | [
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|
PMID:18249 | The use of functional antagonism to determine whether beta-adrenoceptor agonists must have a lower efficacy than isoprenaline to be trachea-atria selective in vitro in guinea-pigs. | 1 The relative efficacies of three trachea-atria selective beta-adrenoceptor agonists, fenoterol, Me 506 and Me 454, compared to isoprenaline, were determined on both trachea and atria of guinea-pigs. 2 On tracheal preparations the beta-adrenoceptor agonists were used as functional antagonists of carbachol and a comparison of the maximum shifts in the carbachol concentration-response line produced by each of the beta-adrenoceptor agonists provided a comparison of their efficacies. 3 On atrial preparations carbachol was used as a functional antagonist of the beta-adrenoceptor agonists and comparison of the maximum responses to the beta-adrenoceptor agonists in the presence of carbachol provided a comparison of their efficacies. 4 On trachea and atria the order of efficacy of the compounds was Me454 greater than Me506 greater than or equal to isoprenaline=fenoterol. 5. The results indicated that high efficacy in a non-catechol beta-adrenoceptor agonist is possible provided there is a favourable N-substituent group. 6 Since Me 454, Me 506 and fenoterol, which are trachea-atria selective, have effficacies equal to or greater than that of isoprenaline, which is non-selective, it is concluded that low efficacy in a compound is not essential for it to show trachea-atria selectivity in vitro in guinea-pigs. | The use of functional antagonism to determine whether beta-adrenoceptor agonists must have a lower efficacy than isoprenaline to be trachea-atria selective in vitro in guinea-pigs. 1 The relative efficacies of three trachea-atria selective beta-adrenoceptor agonists, fenoterol, Me 506 and Me 454, compared to isoprenaline, were determined on both trachea and atria of guinea-pigs. 2 On tracheal preparations the beta-adrenoceptor agonists were used as functional antagonists of carbachol and a comparison of the maximum shifts in the carbachol concentration-response line produced by each of the beta-adrenoceptor agonists provided a comparison of their efficacies. 3 On atrial preparations carbachol was used as a functional antagonist of the beta-adrenoceptor agonists and comparison of the maximum responses to the beta-adrenoceptor agonists in the presence of carbachol provided a comparison of their efficacies. 4 On trachea and atria the order of efficacy of the compounds was Me454 greater than Me506 greater than or equal to isoprenaline=fenoterol. 5. The results indicated that high efficacy in a non-catechol beta-adrenoceptor agonist is possible provided there is a favourable N-substituent group. 6 Since Me 454, Me 506 and fenoterol, which are trachea-atria selective, have effficacies equal to or greater than that of isoprenaline, which is non-selective, it is concluded that low efficacy in a compound is not essential for it to show trachea-atria selectivity in vitro in guinea-pigs. | [
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PMID:18257 | Subcellular distribution of glutamyltransferase activities in embryonic cerebral hemispheres. | Glutamyltransferase (GT) activities were examined in cell groups from embryonic cerebral hemispheres. During normal development, GT activities were highest in a mixed population of small neurons and non-neuronal cells (small cell group). In culture, in response to hydrocortisone, activities exceeded normal levels only in this small cell group. In view of these findings, the small cell population was used to study the subcellular distribution of the enzyme. At the subcellular level, GT activities in the small cell group were distributed differentially but increased generally during normal development. In vitro, hydrocortisone promoted a precocious increase in GT activity, under experimental conditions regarded as optimum, only in the subcellular fraction characterized by synaptic endings. | Subcellular distribution of glutamyltransferase activities in embryonic cerebral hemispheres. Glutamyltransferase (GT) activities were examined in cell groups from embryonic cerebral hemispheres. During normal development, GT activities were highest in a mixed population of small neurons and non-neuronal cells (small cell group). In culture, in response to hydrocortisone, activities exceeded normal levels only in this small cell group. In view of these findings, the small cell population was used to study the subcellular distribution of the enzyme. At the subcellular level, GT activities in the small cell group were distributed differentially but increased generally during normal development. In vitro, hydrocortisone promoted a precocious increase in GT activity, under experimental conditions regarded as optimum, only in the subcellular fraction characterized by synaptic endings. | [
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PMID:18259 | Mnoaminergic reinnervation of the transected spinal cord by homologous fetal brain grafts. | It was shown that immature noradrenaline (NA) containing cells from locus coeruleus and 5-hydroxytryptamine (5-HT) containing cells from the raphé nuclei could survive homologous transplantation to adult spinal cords that were adrenergically denervated by a transverse lesion. Fully viable transplants were found at all postoperative time studied (0.5-4 months) and both NA and 5-HT cell bodies were found to produce a network of nerve terminals in the gray matter and axons in the white matter that reached cranially and caudally at least 10 mm from the cell bodies. The nerve fibers had a normal varicose appearance. It was concluded that NA and 5-HT axons can grow in adult lesioned white matter. | Mnoaminergic reinnervation of the transected spinal cord by homologous fetal brain grafts. It was shown that immature noradrenaline (NA) containing cells from locus coeruleus and 5-hydroxytryptamine (5-HT) containing cells from the raphé nuclei could survive homologous transplantation to adult spinal cords that were adrenergically denervated by a transverse lesion. Fully viable transplants were found at all postoperative time studied (0.5-4 months) and both NA and 5-HT cell bodies were found to produce a network of nerve terminals in the gray matter and axons in the white matter that reached cranially and caudally at least 10 mm from the cell bodies. The nerve fibers had a normal varicose appearance. It was concluded that NA and 5-HT axons can grow in adult lesioned white matter. | [
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|
PMID:18265 | Determination of the preferred tautomeric form histamine by 13C nmr spectroscopy. | The pH-dependent 13C chemical shifts for histamine indicate an approximate 4: 1 preference for the N-H tautomer of the imidazole ring, similar to that previously deduced for L-histidine. It is concluded that the 13C chemical shift method is a complimentary technique to the method of determining tautomer preference from pK values. Factors determining the tautomer preference in histamine and L-histidine are discussed. | Determination of the preferred tautomeric form histamine by 13C nmr spectroscopy. The pH-dependent 13C chemical shifts for histamine indicate an approximate 4: 1 preference for the N-H tautomer of the imidazole ring, similar to that previously deduced for L-histidine. It is concluded that the 13C chemical shift method is a complimentary technique to the method of determining tautomer preference from pK values. Factors determining the tautomer preference in histamine and L-histidine are discussed. | [
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|
PMID:18266 | Effect of metabolites on epsilon-N-hydroxylysine formation in cell-free extracts of Aerobacter aerogenes 62-1. | The conversion of L-lysine to its corresponding epsilon-N-hydroxy derivative has been achieved for the first time by cell-free extracts of Aerobacter aerogenes 62-1. Partial fractionation by differential centrifugation (at 12 000 X g) revealed that both supernatant and pellet are essential for maximum enzymatic activity. The omega-N-hydroxylase (EC 1.14.99) was found to function optimally at pH 7-7.5 and exhibited an apparent Km of about 75 muM for L-lysine. L(+)-Lactate or DL-lactate and pyruvate greatly stimulate the omega-N-hydroxylase activity. The system is strongly inhibited by arsenite and sulfite. | Effect of metabolites on epsilon-N-hydroxylysine formation in cell-free extracts of Aerobacter aerogenes 62-1. The conversion of L-lysine to its corresponding epsilon-N-hydroxy derivative has been achieved for the first time by cell-free extracts of Aerobacter aerogenes 62-1. Partial fractionation by differential centrifugation (at 12 000 X g) revealed that both supernatant and pellet are essential for maximum enzymatic activity. The omega-N-hydroxylase (EC 1.14.99) was found to function optimally at pH 7-7.5 and exhibited an apparent Km of about 75 muM for L-lysine. L(+)-Lactate or DL-lactate and pyruvate greatly stimulate the omega-N-hydroxylase activity. The system is strongly inhibited by arsenite and sulfite. | [
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|
PMID:18267 | Studies related to antitumor antibiotics. Part IX. Reactions of carzinophillin with DNA assayed by ethidium fluorescence. | The reactions of the antitumor antibiotic carzinophillin (CZ) with native DNAs and synthetic polynucleotides have been examined by an ethidium fluorescence assay. CZ rapidly produces covalent linkage of the complementary strands of a variety of DNAs without activation. This process is accompanied by extensive alkylation, as detected by reduced fluorescence due to destruction of potential intercalation sites for ethidium. These processes which occur without loss of purine or pyrimidine bases show a preference for bonding to guanine groups (but not at the N-7 position). Examination of the reversibility of the cross-links suggests they involve one 'permanent' link to guanine and a second weaker linkage, possibly to a cytosine residue. Both cross-linking and alkylation show strong pH dependence and are favored at lower pH, suggesting that reactive sites on the antibiotic are basic. The addition of intercalating agents to DNA before treatment with CZ inhibits the cross-linking. | Studies related to antitumor antibiotics. Part IX. Reactions of carzinophillin with DNA assayed by ethidium fluorescence. The reactions of the antitumor antibiotic carzinophillin (CZ) with native DNAs and synthetic polynucleotides have been examined by an ethidium fluorescence assay. CZ rapidly produces covalent linkage of the complementary strands of a variety of DNAs without activation. This process is accompanied by extensive alkylation, as detected by reduced fluorescence due to destruction of potential intercalation sites for ethidium. These processes which occur without loss of purine or pyrimidine bases show a preference for bonding to guanine groups (but not at the N-7 position). Examination of the reversibility of the cross-links suggests they involve one 'permanent' link to guanine and a second weaker linkage, possibly to a cytosine residue. Both cross-linking and alkylation show strong pH dependence and are favored at lower pH, suggesting that reactive sites on the antibiotic are basic. The addition of intercalating agents to DNA before treatment with CZ inhibits the cross-linking. | [
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|
PMID:18268 | Characteristics of potassium ion transport in pea cotyledon mitochondria isolated by a zonal technique. | Methodology was developed for measurement of K+ transport in pea cotyledon mitochondria isolated by zonal centrifugation. The valinomycin-mediated transport process required respiratory energy from Krebs cycle intermediates and was completely reversible in the absence of oxygen. The rate and extent of uptake were dependent on the presence of proton-conducting anions (with acetate plus phosphate being most effective), well-coupled mitochondria, and on the K+ concentration. | Characteristics of potassium ion transport in pea cotyledon mitochondria isolated by a zonal technique. Methodology was developed for measurement of K+ transport in pea cotyledon mitochondria isolated by zonal centrifugation. The valinomycin-mediated transport process required respiratory energy from Krebs cycle intermediates and was completely reversible in the absence of oxygen. The rate and extent of uptake were dependent on the presence of proton-conducting anions (with acetate plus phosphate being most effective), well-coupled mitochondria, and on the K+ concentration. | [
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|
PMID:18270 | Lithium suppresses elevated behavioural activity and brain catecholamines in developing hyperthyroid rats. | Neonatal hyperthyroidism in rats induced by daily administration of L-triiodothyronine for 30 days since birth resulted in a significant rise in mobility and the metabolism of brain norepinephrine and dopamine. Whereas administration of lithium carbonate (60 mg/kg ip) to normal rats for 6 days produced no effect on spontaneous locomotor activity and increased the synthesis and possibly release of this monoamine in several brain regions, this antimanic drug antagonized the L-triiodothyronine-stimulated increases in mobility as well as norepinephrine and dopamine metabolism of hypothalamus, midbrain, striatum, and cerebral cortex. Furthermore, lithium treatment restored the activity of catechol-O-methyl transferase (EC 2.1.1.6) in young hyperthyroid rats to virtually normal limits. Our data suggest that antiphasic or damping effects of lithium upon mood swings is controlled, at least in part, by catecholaminergic systems in the brain. The interrelationship between brain catecholamines and thyroid hormones seems to be important to our understanding of the action of lithium in affective illness. | Lithium suppresses elevated behavioural activity and brain catecholamines in developing hyperthyroid rats. Neonatal hyperthyroidism in rats induced by daily administration of L-triiodothyronine for 30 days since birth resulted in a significant rise in mobility and the metabolism of brain norepinephrine and dopamine. Whereas administration of lithium carbonate (60 mg/kg ip) to normal rats for 6 days produced no effect on spontaneous locomotor activity and increased the synthesis and possibly release of this monoamine in several brain regions, this antimanic drug antagonized the L-triiodothyronine-stimulated increases in mobility as well as norepinephrine and dopamine metabolism of hypothalamus, midbrain, striatum, and cerebral cortex. Furthermore, lithium treatment restored the activity of catechol-O-methyl transferase (EC 2.1.1.6) in young hyperthyroid rats to virtually normal limits. Our data suggest that antiphasic or damping effects of lithium upon mood swings is controlled, at least in part, by catecholaminergic systems in the brain. The interrelationship between brain catecholamines and thyroid hormones seems to be important to our understanding of the action of lithium in affective illness. | [
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|
PMID:18274 | The tricarboxylic and acid pathway in Desulfovibrio. | Strains of two species of Desulfovibrio were examined for enzymes of the tricarboxylic acid cycle and related pathways. Pyruvate carboxylase (EC6.4.1.1) is present, and alpha-ketoglutarate is formed via the tricarboxylic acids. Glutamate, but not succinyl-CoA, arises from alpha-ketoglutarate. A pathway exists from pyruvate by malic enzyme (EC 1.1.1.39) activity to malate, then fumarate and succinate, again with no evidence of succinyl-CoA formation. The enzymes concerned with metabolism of these dicarboxylic acids show greater activity in the strains that can grow by fumarate dismutation. Glutamate (or glutamine), alpha-ketoglutarate, and yeast extract repress the enzymes that metabolize the tricarboxylic acids. There appears to be no glyoxylate cycle in Desulfovibrio vulgaris or D. desulfuricans. | The tricarboxylic and acid pathway in Desulfovibrio. Strains of two species of Desulfovibrio were examined for enzymes of the tricarboxylic acid cycle and related pathways. Pyruvate carboxylase (EC6.4.1.1) is present, and alpha-ketoglutarate is formed via the tricarboxylic acids. Glutamate, but not succinyl-CoA, arises from alpha-ketoglutarate. A pathway exists from pyruvate by malic enzyme (EC 1.1.1.39) activity to malate, then fumarate and succinate, again with no evidence of succinyl-CoA formation. The enzymes concerned with metabolism of these dicarboxylic acids show greater activity in the strains that can grow by fumarate dismutation. Glutamate (or glutamine), alpha-ketoglutarate, and yeast extract repress the enzymes that metabolize the tricarboxylic acids. There appears to be no glyoxylate cycle in Desulfovibrio vulgaris or D. desulfuricans. | [
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|
PMID:18277 | A case of homosexuality treated by in vivo desensitization and assertive training. | Sexual deviation is not a unitary condition, amenable to a single treatment approach. Deviant sexual arousal has been overemphasized while inadequate attention has been given to associated behavioural problems such as deficient heterosexual arousal, deficient heterosexual skills and gender role deviation. A client with homosexual arousal and requesting aversion therapy was treated successfully and rapidly using in vivo desensitization and assertive training. The treatment is described and the importance of the behavioural analysis in directing the course of therapy is stressed. | A case of homosexuality treated by in vivo desensitization and assertive training. Sexual deviation is not a unitary condition, amenable to a single treatment approach. Deviant sexual arousal has been overemphasized while inadequate attention has been given to associated behavioural problems such as deficient heterosexual arousal, deficient heterosexual skills and gender role deviation. A client with homosexual arousal and requesting aversion therapy was treated successfully and rapidly using in vivo desensitization and assertive training. The treatment is described and the importance of the behavioural analysis in directing the course of therapy is stressed. | [
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|
PMID:18278 | Metabolic response to total parenteral nutrition in cancer patients. | In order to evaluate the metabolic response of nutritionally deprived cancer patients to parenteral nutrition, metabolic parameters including glucose turnover, oxidation, and Cori cycle activity were measured in eight patients before and during short-term (5 to 10 days) i.v. nutrition, with solutions containing amino acids and hypertonic glucose. Before parenteral nutrition, five patients had essentially normal glucose turnover, oxidation, and Cori cycle activity, whereas three patients had moderately increased glucose turnover and markedly increased Cori cycle activity. In response to parenteral nutrition, plasma glucose, insulin, and venous lactate concentration increased and free fatty acid decreased. The percentage of respiratory CO2 from glucose oxidation and the rate of oxidation increased. CO2 production increased, whereas O2 consumption was essentially unchanged. Respiratory quotient rose to greater than 1.0. Endogenous glucose production and high basal Cori cycle activity were decreased. Total parenteral nutrition was judged clinically beneficial in five patients, whereas one patient was unchanged. Deleterious responses, including moderate lactic acidemia, occurred in two of three patients with elevated basal Cori cycle activity. | Metabolic response to total parenteral nutrition in cancer patients. In order to evaluate the metabolic response of nutritionally deprived cancer patients to parenteral nutrition, metabolic parameters including glucose turnover, oxidation, and Cori cycle activity were measured in eight patients before and during short-term (5 to 10 days) i.v. nutrition, with solutions containing amino acids and hypertonic glucose. Before parenteral nutrition, five patients had essentially normal glucose turnover, oxidation, and Cori cycle activity, whereas three patients had moderately increased glucose turnover and markedly increased Cori cycle activity. In response to parenteral nutrition, plasma glucose, insulin, and venous lactate concentration increased and free fatty acid decreased. The percentage of respiratory CO2 from glucose oxidation and the rate of oxidation increased. CO2 production increased, whereas O2 consumption was essentially unchanged. Respiratory quotient rose to greater than 1.0. Endogenous glucose production and high basal Cori cycle activity were decreased. Total parenteral nutrition was judged clinically beneficial in five patients, whereas one patient was unchanged. Deleterious responses, including moderate lactic acidemia, occurred in two of three patients with elevated basal Cori cycle activity. | [
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|
PMID:18280 | A radioimmunoassay for 1-beta-D-arabinofuranosyluracil with reference to cross-reactivity of 1-beta-D-arabinofuranosylcytosine with an antibody. | Antibodies directed against 1-beta-D-arabinofuranosyluracil have been produced in rabbits by immunization with a conjugate of 1-(5-O-succinyl-beta-D-arabinofuranosyl)uracil with human serum albumin. Two of four antibodies so obtained showed high specificity for 1-beta-D-arabinofuranosyluracil and allowed the development of a sensitive and reliable radioimmunoassay for this substrate. On the other hand, one antibody had a high affinity for 1-beta-D-arabinofuranosylcytosine. The binding of 1-beta-D-arabinofuranosylcytosine to this antibody was practically constant between pH 5.2 and 9.0, whereas 1-beta-D-arabinofuranosyluracil binding was affected drastically by pH. The pH-binding profile for 1-beta-D-arabinofuranosylcytosine and 1-beta-D-arabinofuranosyluracil was reminiscent of the specificity of ara-C-specific antibodies, which we previously obtained after immunization of rabbits with 1-(5-O-succinyl-beta-D-arabinofuranosyl)cytosine as a hapten. | A radioimmunoassay for 1-beta-D-arabinofuranosyluracil with reference to cross-reactivity of 1-beta-D-arabinofuranosylcytosine with an antibody. Antibodies directed against 1-beta-D-arabinofuranosyluracil have been produced in rabbits by immunization with a conjugate of 1-(5-O-succinyl-beta-D-arabinofuranosyl)uracil with human serum albumin. Two of four antibodies so obtained showed high specificity for 1-beta-D-arabinofuranosyluracil and allowed the development of a sensitive and reliable radioimmunoassay for this substrate. On the other hand, one antibody had a high affinity for 1-beta-D-arabinofuranosylcytosine. The binding of 1-beta-D-arabinofuranosylcytosine to this antibody was practically constant between pH 5.2 and 9.0, whereas 1-beta-D-arabinofuranosyluracil binding was affected drastically by pH. The pH-binding profile for 1-beta-D-arabinofuranosylcytosine and 1-beta-D-arabinofuranosyluracil was reminiscent of the specificity of ara-C-specific antibodies, which we previously obtained after immunization of rabbits with 1-(5-O-succinyl-beta-D-arabinofuranosyl)cytosine as a hapten. | [
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|
PMID:18281 | Formation of methylhydrazine from acetaldehyde N-methyl-N-formylhydrazone, a component of Gyromitra esculenta. | Gyromitrin, acetaldehyde N-methyl-N-formylhydrazone, is a toxin present in edible wild mushroom Gyromitra esculenta. At 37 degrees under different acidic conditions (pH 1 to 3), mimicking the milieu of human stomach, gyromitrin is converted to methylhydrazine, a known tumor inducer in mice and hamsters, through an intermediate, N-methyl-N-formylhydrazine. In addition, methylhydrazine is formed in the mouse stomach after p.o. administration of gyromitrin. These findings imply that consumption of G. esculenta could present a carcinogenic, as well as an acutely toxic, health hazard. | Formation of methylhydrazine from acetaldehyde N-methyl-N-formylhydrazone, a component of Gyromitra esculenta. Gyromitrin, acetaldehyde N-methyl-N-formylhydrazone, is a toxin present in edible wild mushroom Gyromitra esculenta. At 37 degrees under different acidic conditions (pH 1 to 3), mimicking the milieu of human stomach, gyromitrin is converted to methylhydrazine, a known tumor inducer in mice and hamsters, through an intermediate, N-methyl-N-formylhydrazine. In addition, methylhydrazine is formed in the mouse stomach after p.o. administration of gyromitrin. These findings imply that consumption of G. esculenta could present a carcinogenic, as well as an acutely toxic, health hazard. | [
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|
PMID:18282 | Weekly methotrexate-calcium leucovorin rescue: effect of alkalinization on nephrotoxicity; pharmacokinetics in the CNS; and use in CNS non-Hodgkin's lymphoma. | Urinary alkalinization with oral sodium bicarbonate has decreased the incidence of acute nephrotoxicity and subsequent myelotoxicity in 18 adults receiving high-dose methotrexate with calcium leucovorin rescue (MTX-LCV) weekly in doses of 1-7.5 g/m2. Close monitoring of 24-hour serum creatinine and MTX levels can predict patients at risk for serious toxicity. By a prompt (24-36 hours) increase in the LCV dose rate, hematologic and biochemical evidence of myelosuppression has been prevented. Kinetic parameters in serum and lumbar cerebrospinal fluid (CSF) were studied in two patients following iv injection of 3 and 7.5 g/m2 respectively. Lumbar CSF MTX concentrations greater than 1 muM are achieved. The half-life of MTX in the CSF (11.95 hours) is twice as long as the serum half-life. In the presence of carcinomatous meningitis, further delay in the clearance of MTX from the CSF was seen. With weekly MTX-LCV, there have been four objective responses in six patients with non-Hodgkin's lymphoma in CNS relapse, including complete regression in two. It is suggested that therapeutic concentrations can be achieved in the central nervous system following MTX-LCV. | Weekly methotrexate-calcium leucovorin rescue: effect of alkalinization on nephrotoxicity; pharmacokinetics in the CNS; and use in CNS non-Hodgkin's lymphoma. Urinary alkalinization with oral sodium bicarbonate has decreased the incidence of acute nephrotoxicity and subsequent myelotoxicity in 18 adults receiving high-dose methotrexate with calcium leucovorin rescue (MTX-LCV) weekly in doses of 1-7.5 g/m2. Close monitoring of 24-hour serum creatinine and MTX levels can predict patients at risk for serious toxicity. By a prompt (24-36 hours) increase in the LCV dose rate, hematologic and biochemical evidence of myelosuppression has been prevented. Kinetic parameters in serum and lumbar cerebrospinal fluid (CSF) were studied in two patients following iv injection of 3 and 7.5 g/m2 respectively. Lumbar CSF MTX concentrations greater than 1 muM are achieved. The half-life of MTX in the CSF (11.95 hours) is twice as long as the serum half-life. In the presence of carcinomatous meningitis, further delay in the clearance of MTX from the CSF was seen. With weekly MTX-LCV, there have been four objective responses in six patients with non-Hodgkin's lymphoma in CNS relapse, including complete regression in two. It is suggested that therapeutic concentrations can be achieved in the central nervous system following MTX-LCV. | [
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|
PMID:18283 | Binding of alkyl 1-thio-beta-D-galactopyranosides to beta-D-galactosidase from E. coli. | The binding of a series of alkyl 1-thio-beta-D-galactopyranosides to beta-D-galactosidase from E. coli has been investigated. The inhibition constants were compared to the partition coefficients for the transfer of these substrate-analogues from water to 1-octanol. The relationships between the observed binding-constants and the partition coefficients indicate that part of the aglycon group binds to a hydrophobic area that is limited in relation to the length of hydrocarbon chain that can be accomodated. Outside this area, the hydrocarbon chain is only partially desolvated. The main driving-force for binding of the aglycon group is the increase in entropy resulting from the return of water molecules from the more-organized layer around the solute molecule to the bulk-water phase. | Binding of alkyl 1-thio-beta-D-galactopyranosides to beta-D-galactosidase from E. coli. The binding of a series of alkyl 1-thio-beta-D-galactopyranosides to beta-D-galactosidase from E. coli has been investigated. The inhibition constants were compared to the partition coefficients for the transfer of these substrate-analogues from water to 1-octanol. The relationships between the observed binding-constants and the partition coefficients indicate that part of the aglycon group binds to a hydrophobic area that is limited in relation to the length of hydrocarbon chain that can be accomodated. Outside this area, the hydrocarbon chain is only partially desolvated. The main driving-force for binding of the aglycon group is the increase in entropy resulting from the return of water molecules from the more-organized layer around the solute molecule to the bulk-water phase. | [
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|
PMID:18287 | Hypersensitivity reactions in the small intestine. III. The effects of allograft rejection and of graft-versus-host disease on epithelial cell kinetics. | Allograft rejection of fetal intestine and graft-versus-host (GvH) disease have been used to study the effects of cell-mediated immune reactions on epithelial cell kinetics in mouse small intestine. In heterotopically transplanted isografts the cell production rate per crypt was similar to that in normally sited small intestine of the same age. However there was a six-fold increase in the rate of cell production per crypt during allograft rejection and a three-fold increase during GvH disease. Furthermore animals with GvH disease developed villous atrophy and had fewer crypts per villus that littermate controls. At the age of 19 days cell production per villus per hour was 97-5 in animals with GvH disease compared with 54-6 in controls. These results indicate that the pathological entity of 'partial villous atrophy' evolves in two distinct phases. Phase 1, a state of increased cell turnover with crypt hyperplasia but villi of normal length precedes the development of Phase 2, true villous atrophy. | Hypersensitivity reactions in the small intestine. III. The effects of allograft rejection and of graft-versus-host disease on epithelial cell kinetics. Allograft rejection of fetal intestine and graft-versus-host (GvH) disease have been used to study the effects of cell-mediated immune reactions on epithelial cell kinetics in mouse small intestine. In heterotopically transplanted isografts the cell production rate per crypt was similar to that in normally sited small intestine of the same age. However there was a six-fold increase in the rate of cell production per crypt during allograft rejection and a three-fold increase during GvH disease. Furthermore animals with GvH disease developed villous atrophy and had fewer crypts per villus that littermate controls. At the age of 19 days cell production per villus per hour was 97-5 in animals with GvH disease compared with 54-6 in controls. These results indicate that the pathological entity of 'partial villous atrophy' evolves in two distinct phases. Phase 1, a state of increased cell turnover with crypt hyperplasia but villi of normal length precedes the development of Phase 2, true villous atrophy. | [
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|
PMID:18288 | The development of membrane specializations in the receptor-bipolar-horizontal cell synapse of the chick embryo retina. A freeze-fracture study. | Retinae of chick embryos and chicks one to six weeks after hatching were examined in ultrathin sections and in freeze-etch specimens. The development of the synaptic contacts between receptor cells and bipolar cells starts at the end of the second week of incubation with the enclosure of the dendritic prolongations, invaginating receptor terminals accompanied by the appearance of electron dense material at the synaptic contact sites. Subsequently receptor terminals become filled with synaptic vesicles which surround the synaptic lamellae that appear on the 16th day of incubation. The application of the freeze-fracture technique demonstrates that the differentiation of the synaptic membranes continues into the first week post hatching. E-fracture faces of the presynaptic membranes are characterized by crater-like structures, called synaptopores. Their number is rather small during incubation and increases after hatching. In the P-fracture faces of the dendrites, which are enclosed by the receptor terminals, small particle aggregations appear on the 16th day of incubation. These small particle clusters increase by the apposition of further particles which become arranged in lines and bring out a lattice-like aspect. This arrangement of particles in the inner part of the cell membrane is the morphological expression of the maturation process. The significance of these aggregations as a postsynaptic receptor for neurotransmitters in excitatory cells is discussed. | The development of membrane specializations in the receptor-bipolar-horizontal cell synapse of the chick embryo retina. A freeze-fracture study. Retinae of chick embryos and chicks one to six weeks after hatching were examined in ultrathin sections and in freeze-etch specimens. The development of the synaptic contacts between receptor cells and bipolar cells starts at the end of the second week of incubation with the enclosure of the dendritic prolongations, invaginating receptor terminals accompanied by the appearance of electron dense material at the synaptic contact sites. Subsequently receptor terminals become filled with synaptic vesicles which surround the synaptic lamellae that appear on the 16th day of incubation. The application of the freeze-fracture technique demonstrates that the differentiation of the synaptic membranes continues into the first week post hatching. E-fracture faces of the presynaptic membranes are characterized by crater-like structures, called synaptopores. Their number is rather small during incubation and increases after hatching. In the P-fracture faces of the dendrites, which are enclosed by the receptor terminals, small particle aggregations appear on the 16th day of incubation. These small particle clusters increase by the apposition of further particles which become arranged in lines and bring out a lattice-like aspect. This arrangement of particles in the inner part of the cell membrane is the morphological expression of the maturation process. The significance of these aggregations as a postsynaptic receptor for neurotransmitters in excitatory cells is discussed. | [
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|
PMID:18289 | Fine structure of the adhesive pads of Gonionemus vertens. | The adhesive pads of Gonionemus vertens, located near the distal end of each tentacle, consist of a layer of columnar glandulomuscular cells surrounded by a collar of microfilament containing epithelial cells. The glandulomuscular cells contain dense secretory rods, microtubules, rough endoplasmic reticulum, Golgi elements and myonemes. Axons located between the basal portions of the glandulomuscular cells form synapses with the glandulomuscular cells. The roles of these various cell organelles in adhesion and detachment process are discussed. | Fine structure of the adhesive pads of Gonionemus vertens. The adhesive pads of Gonionemus vertens, located near the distal end of each tentacle, consist of a layer of columnar glandulomuscular cells surrounded by a collar of microfilament containing epithelial cells. The glandulomuscular cells contain dense secretory rods, microtubules, rough endoplasmic reticulum, Golgi elements and myonemes. Axons located between the basal portions of the glandulomuscular cells form synapses with the glandulomuscular cells. The roles of these various cell organelles in adhesion and detachment process are discussed. | [
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|
PMID:18291 | Adduct formation between the carcinogen N-acetoxy-2-acetylaminofluorene and synthetic polydeoxyribonucleotides. | The chemical carcinogen N-acetoxy-2-acetylaminofluorene (NA-AAF) was reacted with poly(dG-dC) - poly(dG-dC); poly dG - poly dC; poly(dA-dT) - poly (dA-dT); and poly dA - poly dT under a variety of conditions. Poly (dG-homo GC polymer and 10--20 more reactive the A + T polymers. Lowering the ionic strength increased the extent of reaction, while pH change (8.9 vs. 5.5) had only a small effect. If ionic strength was adjusted so that the two guanine-containing polymers showed equal thermal stability (as judged by Tm) then the alternating copolymer was 7 times as reactive as the homopolymer. In aggreement with previous investigators, the major product was found to be 8-(N-2-fluorenylacetamido) deoxyguanosine. | Adduct formation between the carcinogen N-acetoxy-2-acetylaminofluorene and synthetic polydeoxyribonucleotides. The chemical carcinogen N-acetoxy-2-acetylaminofluorene (NA-AAF) was reacted with poly(dG-dC) - poly(dG-dC); poly dG - poly dC; poly(dA-dT) - poly (dA-dT); and poly dA - poly dT under a variety of conditions. Poly (dG-homo GC polymer and 10--20 more reactive the A + T polymers. Lowering the ionic strength increased the extent of reaction, while pH change (8.9 vs. 5.5) had only a small effect. If ionic strength was adjusted so that the two guanine-containing polymers showed equal thermal stability (as judged by Tm) then the alternating copolymer was 7 times as reactive as the homopolymer. In aggreement with previous investigators, the major product was found to be 8-(N-2-fluorenylacetamido) deoxyguanosine. | [
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|
PMID:18292 | Effect of gastrin on the cell kinetics of rat gastric mucosa. | The effects of gastrin on the cell kinetics of the gastric mucosa were studied in the rats. The labelling index by tritiated thymidine of the cell in the mucous neck zone began to rise 14 hours after a single dose of tetragastrin at 100 or 1,000 microgram/kg or synthetic human gastrin at 1,000 microgram/kg and reached the peak at 18 hours. With tetragastrin 100 microgram/kg administered subcutaneously together with a depot for 35 days, observations were made on the change in the turnover rate of the gastric epithelium by means of labelling index. The turnover rate was delayed in the surface epithelium and accelerated in the cells at the lower part of the foveolae in the gastrin-administered group. The cell suspension prepared from the rat gastric mucosa by trypsin digestion was cultivated with 5 per cent of CO2 in air for 48 hours. The group which was added with 10 microgram/ml of tetragastrin showed fluctuations in the labelling index almost similar to the groups administered 100 and 1,000 microgram/kg in vivo. It might be possible to support the hypothesis that gastrin not only has a trophic effect on the mucous neck zone but it also might be concerned with the turnover of the mature stage of gastric mucosa. | Effect of gastrin on the cell kinetics of rat gastric mucosa. The effects of gastrin on the cell kinetics of the gastric mucosa were studied in the rats. The labelling index by tritiated thymidine of the cell in the mucous neck zone began to rise 14 hours after a single dose of tetragastrin at 100 or 1,000 microgram/kg or synthetic human gastrin at 1,000 microgram/kg and reached the peak at 18 hours. With tetragastrin 100 microgram/kg administered subcutaneously together with a depot for 35 days, observations were made on the change in the turnover rate of the gastric epithelium by means of labelling index. The turnover rate was delayed in the surface epithelium and accelerated in the cells at the lower part of the foveolae in the gastrin-administered group. The cell suspension prepared from the rat gastric mucosa by trypsin digestion was cultivated with 5 per cent of CO2 in air for 48 hours. The group which was added with 10 microgram/ml of tetragastrin showed fluctuations in the labelling index almost similar to the groups administered 100 and 1,000 microgram/kg in vivo. It might be possible to support the hypothesis that gastrin not only has a trophic effect on the mucous neck zone but it also might be concerned with the turnover of the mature stage of gastric mucosa. | [
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|
PMID:18293 | [Growth and sporulation of Entomophthora virulenta Hall and Dunn in discontinuous liquid culture]. | Fermented cultures of Entomophthora virulenta showed an exponential phase with a specific growth rate of 0,14 h-1. The deceleration phase was 4 times longer than the exponential phase. Sexual sporulation occurred at the end of the deceleration phase. A technique of medium replacement demonstrated that any lack of nutritive balance induced the sporulation. | [Growth and sporulation of Entomophthora virulenta Hall and Dunn in discontinuous liquid culture]. Fermented cultures of Entomophthora virulenta showed an exponential phase with a specific growth rate of 0,14 h-1. The deceleration phase was 4 times longer than the exponential phase. Sexual sporulation occurred at the end of the deceleration phase. A technique of medium replacement demonstrated that any lack of nutritive balance induced the sporulation. | [
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|
PMID:18294 | [Interaction of thymic cells and hemopoietic stem cells. Enhancing effect on irradiated thymus repopulation]. | In irradiated mice engrafted with hemopoietic cells, the thymus is repopulated more rapidly by bone marrow-derived than by spleen-derived cells. Admixing thymic cells with the restorative suspension stimulates the thymic repopulation by spleen-derived cells whereas it has no effect on the repopulation by bone marrow-derived cells. | [Interaction of thymic cells and hemopoietic stem cells. Enhancing effect on irradiated thymus repopulation]. In irradiated mice engrafted with hemopoietic cells, the thymus is repopulated more rapidly by bone marrow-derived than by spleen-derived cells. Admixing thymic cells with the restorative suspension stimulates the thymic repopulation by spleen-derived cells whereas it has no effect on the repopulation by bone marrow-derived cells. | [
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|
PMID:18295 | Clinical importance of lipase determination by the turbidimetric procedure as compared with determination by a chromatrographic procedure. | The turbidimetric determination of serum lipase activity was compared with the chromatographic determination in three groups of patients, including patients affected by hepatic diseases, patients affected by pancreatic diseases and a control group. The two methods were also compared in the determination of lipase activity of human leucocytes in vitro. The results show that there is a good statistical correlation of lipase turbidimetrically determined at pH 9.15 and amylase in serum of normal individuals and in serum of patients with pancreatic diseases. There is no correlation between amylase and chromatographically determined lipase. The other types of lipase activity determined, i.e. turbidimetrically assayed at pH 5.5 and chromatographically assayed both at pH 5.5 and at pH 9.15, might be related to a different non-pancreatic enzymatic activity which is likely to lack diagnostic value. This suggests that methods of lipase determination based, for instance, on fatty acid liberation are of limited value in clinical studies on lipase. | Clinical importance of lipase determination by the turbidimetric procedure as compared with determination by a chromatrographic procedure. The turbidimetric determination of serum lipase activity was compared with the chromatographic determination in three groups of patients, including patients affected by hepatic diseases, patients affected by pancreatic diseases and a control group. The two methods were also compared in the determination of lipase activity of human leucocytes in vitro. The results show that there is a good statistical correlation of lipase turbidimetrically determined at pH 9.15 and amylase in serum of normal individuals and in serum of patients with pancreatic diseases. There is no correlation between amylase and chromatographically determined lipase. The other types of lipase activity determined, i.e. turbidimetrically assayed at pH 5.5 and chromatographically assayed both at pH 5.5 and at pH 9.15, might be related to a different non-pancreatic enzymatic activity which is likely to lack diagnostic value. This suggests that methods of lipase determination based, for instance, on fatty acid liberation are of limited value in clinical studies on lipase. | [
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|
PMID:18296 | [Amino acid-p-nitroanilide-splitting activities in human serum (author's transl)]. | Proteolytic, arylamidase-like activities of human serum are determined by using a sensitive micromethod, based upon the Bratton-Marshall-reaction, and amino acid-p-nitroanilides as substrates. Besides the alanine-aminopeptidase and the oxytocinase, the dipeptide-aminopeptidase II, a neutral peptidase, and 6 other peptidases, not yet identified by us, are differentiated with the aid of 19 substrates, by adding 8 effectors, and by incubating the enzyme tests within the pH range 6.0 to 8.4. | [Amino acid-p-nitroanilide-splitting activities in human serum (author's transl)]. Proteolytic, arylamidase-like activities of human serum are determined by using a sensitive micromethod, based upon the Bratton-Marshall-reaction, and amino acid-p-nitroanilides as substrates. Besides the alanine-aminopeptidase and the oxytocinase, the dipeptide-aminopeptidase II, a neutral peptidase, and 6 other peptidases, not yet identified by us, are differentiated with the aid of 19 substrates, by adding 8 effectors, and by incubating the enzyme tests within the pH range 6.0 to 8.4. | [
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|
PMID:18297 | A new variant of glucosephosphate isomerase deficiency: GPI-Kortrijk. | A new case of glucosephosphate isomerase deficiency in a Belgian family is described. The activity of the enzyme was decreased to about 25-30% of the normal value. Characterization of the defect enzyme showed a decreased thermostability. Heating of the enzyme at 45 degrees C showed a loss of activity of 50% after 90 min. The pH-optimum and the KM-value for fructose 6-phosphate were normal. The electrophoretic pattern showed a faster migration. The variant described here differs from all known variants. Therefore we propose to give to this new variant the name GPI-Kortrijk. | A new variant of glucosephosphate isomerase deficiency: GPI-Kortrijk. A new case of glucosephosphate isomerase deficiency in a Belgian family is described. The activity of the enzyme was decreased to about 25-30% of the normal value. Characterization of the defect enzyme showed a decreased thermostability. Heating of the enzyme at 45 degrees C showed a loss of activity of 50% after 90 min. The pH-optimum and the KM-value for fructose 6-phosphate were normal. The electrophoretic pattern showed a faster migration. The variant described here differs from all known variants. Therefore we propose to give to this new variant the name GPI-Kortrijk. | [
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|
PMID:18298 | Purification and properties of urinary alkaline ribonucleases from patients with nephrotic syndrome. | Four urinary alkaline ribonucleases (RNase, EC 3.1.4.22) were purified from patients with nephrotic syndrome using phosphocellulose, DEAE-cellulose and Sephadex G-75 chromatographiy. These enzymes were designated as RNases 1--4, respectively, in order of elution on phosphocellulose chromatography. The respective purification of each fraction was 41-, 23-, 34- and 27-fold with a total recovery of 25%. The pH optima of these RNases were around 8.5 with Tris/HCl buffer and the reaction was activated by mono- and divalent cations, such as Na+, K+, Mg2+ and Ca2+, but inhibited by Fe2+, Cu2+ and Zn2+. EDTA had little effect on the velocity of reaction. The molecular weights of RNases 1--4 were estimated by gel filtration as 45 000, 32 000, 20 000, and 13 000, respectively. Each enzyme hydrolyzed pyrimidine nucleotides preferentially with higher affinity for poly(C) than poly (U) as determined with synthetic polymers and was free from other nucleolytic enzymes. The patients with renal disorders excreted one to four RNases in urine and the number of enzymes increased as the concentration of urinary protein increased. On the other hand, normal subjects excreted a single fraction essentially identical to RNase 1. | Purification and properties of urinary alkaline ribonucleases from patients with nephrotic syndrome. Four urinary alkaline ribonucleases (RNase, EC 3.1.4.22) were purified from patients with nephrotic syndrome using phosphocellulose, DEAE-cellulose and Sephadex G-75 chromatographiy. These enzymes were designated as RNases 1--4, respectively, in order of elution on phosphocellulose chromatography. The respective purification of each fraction was 41-, 23-, 34- and 27-fold with a total recovery of 25%. The pH optima of these RNases were around 8.5 with Tris/HCl buffer and the reaction was activated by mono- and divalent cations, such as Na+, K+, Mg2+ and Ca2+, but inhibited by Fe2+, Cu2+ and Zn2+. EDTA had little effect on the velocity of reaction. The molecular weights of RNases 1--4 were estimated by gel filtration as 45 000, 32 000, 20 000, and 13 000, respectively. Each enzyme hydrolyzed pyrimidine nucleotides preferentially with higher affinity for poly(C) than poly (U) as determined with synthetic polymers and was free from other nucleolytic enzymes. The patients with renal disorders excreted one to four RNases in urine and the number of enzymes increased as the concentration of urinary protein increased. On the other hand, normal subjects excreted a single fraction essentially identical to RNase 1. | [
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|
PMID:18299 | Properties of the thyroxine (T4) monodeiodinating system in rat liver homogenate. | The monodeiodination of T4 in rat liver homogenate was studied. The two possible products of this reaction show very different properties. The metabolically very active T3 is rather stable in this system whereas the biological inactive reverse T3 (rT3) disappears very rapidly. This explains the low apparent rT3 production in the incubation mixture even under optimal conditions and the peculiar pH profile. The T4 to T3 converting reaction can be increased by the addition of mercaptoethanol to the medium; no further activation is possible by several cofactors tested. The apparent KM of the reaction is 1.6 x 10(-6) M. Reverse T3 does inhibit the reaction non competitive; Ki = 2 x 10 (10-8) M. Alpha-methyl-para-tyrosine, a specific inhibitor of tyrosine hydroxylase, has no significant effect on the reaction. | Properties of the thyroxine (T4) monodeiodinating system in rat liver homogenate. The monodeiodination of T4 in rat liver homogenate was studied. The two possible products of this reaction show very different properties. The metabolically very active T3 is rather stable in this system whereas the biological inactive reverse T3 (rT3) disappears very rapidly. This explains the low apparent rT3 production in the incubation mixture even under optimal conditions and the peculiar pH profile. The T4 to T3 converting reaction can be increased by the addition of mercaptoethanol to the medium; no further activation is possible by several cofactors tested. The apparent KM of the reaction is 1.6 x 10(-6) M. Reverse T3 does inhibit the reaction non competitive; Ki = 2 x 10 (10-8) M. Alpha-methyl-para-tyrosine, a specific inhibitor of tyrosine hydroxylase, has no significant effect on the reaction. | [
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|
PMID:18300 | Conversion of T4 to T3 and rT3 and their cytoplasmic binding: pH dependency. | The fate of T4 in target organs is conversion to T3 which is mainly responsible for the nuclear action of thyroid hormones. To further investigate this converting step the increase of T3 and its analogue rT3 in rat liver microsomes was measured by specific radioimmunoassays after adding T4 to the incubation medium. Maximal increase of T3 occurred at pH 6.0 and of rT3 at pH 9.5 indicating that two different enzymic systems may be involved in the deiodination of the tyrosyl or the phenolic ring of T4. An increase in the binding capacity of cytosol proteins for T4, T3 and rT3 with rising pH demonstrates that there is also a pH dependency of the cytoplasmic binding of these iodothyronines. These reaction conditions should not only be considered in in vitro experiments, but may also be of importance in modifying the availability of T3 for its nuclear receptors. | Conversion of T4 to T3 and rT3 and their cytoplasmic binding: pH dependency. The fate of T4 in target organs is conversion to T3 which is mainly responsible for the nuclear action of thyroid hormones. To further investigate this converting step the increase of T3 and its analogue rT3 in rat liver microsomes was measured by specific radioimmunoassays after adding T4 to the incubation medium. Maximal increase of T3 occurred at pH 6.0 and of rT3 at pH 9.5 indicating that two different enzymic systems may be involved in the deiodination of the tyrosyl or the phenolic ring of T4. An increase in the binding capacity of cytosol proteins for T4, T3 and rT3 with rising pH demonstrates that there is also a pH dependency of the cytoplasmic binding of these iodothyronines. These reaction conditions should not only be considered in in vitro experiments, but may also be of importance in modifying the availability of T3 for its nuclear receptors. | [
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|
PMID:18301 | PZ-peptidase activity in human uterine cervix in pregnancy at term. | PZ-peptidase (EC 3.4.--) was detected in human uterine cervix distributed in the soluble fraction after 100 000 x g centrifugation. Optimum pH for PZ-peptidase was observed to be pH 7.2--7.4, except for two of the preparations examined. PZ-peptidase activity was found to significantly increase in pregnancy at term as compared with that in a control group. | PZ-peptidase activity in human uterine cervix in pregnancy at term. PZ-peptidase (EC 3.4.--) was detected in human uterine cervix distributed in the soluble fraction after 100 000 x g centrifugation. Optimum pH for PZ-peptidase was observed to be pH 7.2--7.4, except for two of the preparations examined. PZ-peptidase activity was found to significantly increase in pregnancy at term as compared with that in a control group. | [
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|
PMID:18303 | Diagnosis of Pompe's disease in cultured skin fibroblasts and primary amniotic fluid cells using 4-methylumbelliferyl-alpha-D-glucopyranoside as substrate. | The possible interference of neutral alpha-D-glucosidase in the diagnosis of Pompe's disease using 4-methylumbelliferyl-alpha-D-glucopyranoside as substrate for the assay of acid alpha-D-glucosidase was investigated. The pH profile of alpha-D-glucosidase in control skin fibroblasts and amniotic fluid cells showed two peaks of activity. The shape of the pH profile depended upon whether or not the extract was added to the buffer before the substrate. If extract was added to the buffer before the substrate, a greater separation was obtained between the two peaks of activity. The neutral alpha-D-glucosidase activity could be totally removed by preliminary precipitation at pH 5.0. Following acid region whilst Pompe's cells had no activity enabling a clear distinction to be made between carriers and the disease state. | Diagnosis of Pompe's disease in cultured skin fibroblasts and primary amniotic fluid cells using 4-methylumbelliferyl-alpha-D-glucopyranoside as substrate. The possible interference of neutral alpha-D-glucosidase in the diagnosis of Pompe's disease using 4-methylumbelliferyl-alpha-D-glucopyranoside as substrate for the assay of acid alpha-D-glucosidase was investigated. The pH profile of alpha-D-glucosidase in control skin fibroblasts and amniotic fluid cells showed two peaks of activity. The shape of the pH profile depended upon whether or not the extract was added to the buffer before the substrate. If extract was added to the buffer before the substrate, a greater separation was obtained between the two peaks of activity. The neutral alpha-D-glucosidase activity could be totally removed by preliminary precipitation at pH 5.0. Following acid region whilst Pompe's cells had no activity enabling a clear distinction to be made between carriers and the disease state. | [
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|
PMID:18304 | A new method for peptidase activity measurement in serum and tissues, using L-Leu-L-Leu as substrate. | Peptidase-free L-amino-acid oxidase was purified from venom of Agkistrodon caliginosus and was used for the determination of serum peptidase (EC 3.4.1.-) activity with L-Leu-L-Leu as substrate. The peptidase activity in human serum rose remarkably in liver diseases, and had a significant correlation with serum transaminase activity. The peptidase activity in serum of rats treated with CCl4 was higher than that of normal rats. After Cellogel electrophoresis the zymogram of peptidase from human liver using di- or tripeptide as substrate appeared with three active bands; however, peptidase in serum of a patient with acute hepatitis showed only one active band. | A new method for peptidase activity measurement in serum and tissues, using L-Leu-L-Leu as substrate. Peptidase-free L-amino-acid oxidase was purified from venom of Agkistrodon caliginosus and was used for the determination of serum peptidase (EC 3.4.1.-) activity with L-Leu-L-Leu as substrate. The peptidase activity in human serum rose remarkably in liver diseases, and had a significant correlation with serum transaminase activity. The peptidase activity in serum of rats treated with CCl4 was higher than that of normal rats. After Cellogel electrophoresis the zymogram of peptidase from human liver using di- or tripeptide as substrate appeared with three active bands; however, peptidase in serum of a patient with acute hepatitis showed only one active band. | [
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|
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