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PMID:16868 | Regulation of enzyme synthesis by the glutamine synthetase of Salmonella typhimurium: a factor in addition to glutamine synthetase is required for activation of enzyme formation. | In Klebsiella aerogenes but not in Salmonella typhimurium glutamine synthetase can function during nitrogen-limited growth to increase the rate of synthesis of histidase from the hut genes of S. typhimurium 15-59 (hutS. 15-59). Formation of proline oxidase is also not increased in nitrogen-limited cultures of S. typhimurium. However, in hybrid strains of Escherichia coli or K. aerogenes, the glutamine synthetase of S. typhimurium activates synthesis of histidase from the hutS. 15-59 genes. Apparently, glutamine synthetase is necessary but not sufficient for activation of transcription of the hut genes; another factor must also be present. This factor is active in both K. aerogenes and E. coli but is missing or altered in S. typhimurium. | Regulation of enzyme synthesis by the glutamine synthetase of Salmonella typhimurium: a factor in addition to glutamine synthetase is required for activation of enzyme formation. In Klebsiella aerogenes but not in Salmonella typhimurium glutamine synthetase can function during nitrogen-limited growth to increase the rate of synthesis of histidase from the hut genes of S. typhimurium 15-59 (hutS. 15-59). Formation of proline oxidase is also not increased in nitrogen-limited cultures of S. typhimurium. However, in hybrid strains of Escherichia coli or K. aerogenes, the glutamine synthetase of S. typhimurium activates synthesis of histidase from the hutS. 15-59 genes. Apparently, glutamine synthetase is necessary but not sufficient for activation of transcription of the hut genes; another factor must also be present. This factor is active in both K. aerogenes and E. coli but is missing or altered in S. typhimurium. | [
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PMID:16870 | Alkaline serine proteinases D and E of Streptomyces griseus K-1. | Two DFP-sensitive alkaline proteinases with strong esterase activity toward Ac-(Ala)3-OMe, designated as alkaline serine proteinases D and E, were purified pronase, a protease mixture from St. griseus K-1. Each was shown to be homogeneous by acrylamide disc gel electrophoresis. The molecular weights of these enzymes were estimated to be about 27,000 be gel filtration. Studies on their actions on acyl-tl-amino acid methyl or ethyl esters indicated that proteinases D and E both exhibited a broad substrate specificity and hydrolyzed the ester bonds of esters containing Trp, Tyr, Phe, Leu, and Ala. The esterase activities of both enzymes toward Ac-(Ala)3-OMe were the highest among proteinases so far isolated from various sources. Proteinases D and E also lacked cystine residues in their molecules, being entirely different from alkaline serine proteinases A, B, and C in pronase. Some differences were , however, observed between them as regards pH stability, behavior on CM-cellulose, mobility on polyacrylamide electrophoresis, and amidase activity toward Suc-(Ala)3-pNA. | Alkaline serine proteinases D and E of Streptomyces griseus K-1. Two DFP-sensitive alkaline proteinases with strong esterase activity toward Ac-(Ala)3-OMe, designated as alkaline serine proteinases D and E, were purified pronase, a protease mixture from St. griseus K-1. Each was shown to be homogeneous by acrylamide disc gel electrophoresis. The molecular weights of these enzymes were estimated to be about 27,000 be gel filtration. Studies on their actions on acyl-tl-amino acid methyl or ethyl esters indicated that proteinases D and E both exhibited a broad substrate specificity and hydrolyzed the ester bonds of esters containing Trp, Tyr, Phe, Leu, and Ala. The esterase activities of both enzymes toward Ac-(Ala)3-OMe were the highest among proteinases so far isolated from various sources. Proteinases D and E also lacked cystine residues in their molecules, being entirely different from alkaline serine proteinases A, B, and C in pronase. Some differences were , however, observed between them as regards pH stability, behavior on CM-cellulose, mobility on polyacrylamide electrophoresis, and amidase activity toward Suc-(Ala)3-pNA. | [
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|
PMID:16871 | Amino acid sequence of a cyanogen bromide fragment containing the two tryptophanyl residues of lobster arginine kinase (Homarus vulgaris). | Lobster arginine kinase [EC 2.7.3.3] contains 2 tryptophanyl residues and 9 methionyl residues. The whole carboxymethylated protein was first subjected to CNBr cleavage and the resulting fragments were isolated by gel filtration and other experimental approaches. One fragment, CB5, which contains 60 residues including the two tryptophanyl residues and two of the five cysteinyl residues of the protein, was characterized and the results are reported inthis paper. The overall strategy for the establishment of the complete sequence of this fragment was based on the use of three types of peptides: (a) whole cyanogen bromide peptide CB5 which was partially characterized by automatic Edman degradation using a sequencer: 42 steps were performed out of 60 residues, (b) tryptic peptides of CB5, (c) peptides formed by cleavage of S-carboxymethylated arginine kinase (whole protein) at the two tryptophanyl residues with BNPS-skatole. The complete amino acid sequence of the CNBr polypeptide (CB5) which contains the two tryptophanyl residues of the whole protein was established. | Amino acid sequence of a cyanogen bromide fragment containing the two tryptophanyl residues of lobster arginine kinase (Homarus vulgaris). Lobster arginine kinase [EC 2.7.3.3] contains 2 tryptophanyl residues and 9 methionyl residues. The whole carboxymethylated protein was first subjected to CNBr cleavage and the resulting fragments were isolated by gel filtration and other experimental approaches. One fragment, CB5, which contains 60 residues including the two tryptophanyl residues and two of the five cysteinyl residues of the protein, was characterized and the results are reported inthis paper. The overall strategy for the establishment of the complete sequence of this fragment was based on the use of three types of peptides: (a) whole cyanogen bromide peptide CB5 which was partially characterized by automatic Edman degradation using a sequencer: 42 steps were performed out of 60 residues, (b) tryptic peptides of CB5, (c) peptides formed by cleavage of S-carboxymethylated arginine kinase (whole protein) at the two tryptophanyl residues with BNPS-skatole. The complete amino acid sequence of the CNBr polypeptide (CB5) which contains the two tryptophanyl residues of the whole protein was established. | [
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|
PMID:16872 | Purification and characterization of arylamidase from monkey brain. | Arylamidase [EC3.4.11.2] was isolated from monkey brain extract and purified about 2100-fold in approximately 11% yield by a six-step procedure comprising extraction from monkey brain homogenate, ammonium sulfate fractionation, first hydroxylapatite chromatography, DEAE-cellulose chromatography, Sephadex G-200 gell filtration and second hydroxylapatite chromatography. The enzyme showed a single band on polyacrylamide disc electrophoresis and consisted of a single polypeptide chain, as judged by disc electrophoresis in the presence of sodium dodecyl sulfate. The enzyme was strongly inhibited by PCMB, TPCK, and puromycin. Puromycin competitively inhibited the enzyme and the Ii value was about 5 x 10(-7)M. Treatment with EDTA resulted in a loss of enzyme activity. The enzyme activity was restored by addition of Zn2+, Co2+, Mn2+. Among various amino acid beta-naphthylamides, L-alanine beta-naphthylamide was most rapidly hydrolyzed and N-carbobenzoxyl-L-leucine beta-naphthylamide was not hydrolyzed by this enzyme preparation. The molecular weight of the enzyme was 92,000 as determined by gel filtration on Sephadex G-200. | Purification and characterization of arylamidase from monkey brain. Arylamidase [EC3.4.11.2] was isolated from monkey brain extract and purified about 2100-fold in approximately 11% yield by a six-step procedure comprising extraction from monkey brain homogenate, ammonium sulfate fractionation, first hydroxylapatite chromatography, DEAE-cellulose chromatography, Sephadex G-200 gell filtration and second hydroxylapatite chromatography. The enzyme showed a single band on polyacrylamide disc electrophoresis and consisted of a single polypeptide chain, as judged by disc electrophoresis in the presence of sodium dodecyl sulfate. The enzyme was strongly inhibited by PCMB, TPCK, and puromycin. Puromycin competitively inhibited the enzyme and the Ii value was about 5 x 10(-7)M. Treatment with EDTA resulted in a loss of enzyme activity. The enzyme activity was restored by addition of Zn2+, Co2+, Mn2+. Among various amino acid beta-naphthylamides, L-alanine beta-naphthylamide was most rapidly hydrolyzed and N-carbobenzoxyl-L-leucine beta-naphthylamide was not hydrolyzed by this enzyme preparation. The molecular weight of the enzyme was 92,000 as determined by gel filtration on Sephadex G-200. | [
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|
PMID:16873 | Anhydrotrypsin: new features in ligand interactions revealed by affinity chromatography and thionine replacement. | Anhydrotrypsin was isolated in high purity from the product of base elimination from phenylmethanesulfonyl-trypsin, by a single operation of affinity chromatography. The adsorbent used for the chromatography was an agarose derivative coupled with peptides containing C-terminal arginine residues. As the affinity of the adsorbent for anhydrotrypsin was high compared with that for trypsin, purification of the enzyme derivative was easily achieved without the prior inactivation of trypsin which had been regenerated during the elimination reaction. Comparative studies of the ligand interaction specificities with anhydrotrypsin and trypsin confirmed the stronger interaction of the former protein with product-type ligands such as Bz-Arg-OH. No marked differences were observed between them in affinities toward substrate-type ligands such as Bz-Arg-NH2. The higher affinity of anhydrotrypsin was found to be limited to product-type ligands of L-configuration, i.e., the protein displayed an ability to discriminate the L-ligand from its optical isomer. THE PKa value for the ionization form of anhydrotrypsin responsible for the interaction with Bz-Arg-OH was estimated to be 7.60+/-0907 | Anhydrotrypsin: new features in ligand interactions revealed by affinity chromatography and thionine replacement. Anhydrotrypsin was isolated in high purity from the product of base elimination from phenylmethanesulfonyl-trypsin, by a single operation of affinity chromatography. The adsorbent used for the chromatography was an agarose derivative coupled with peptides containing C-terminal arginine residues. As the affinity of the adsorbent for anhydrotrypsin was high compared with that for trypsin, purification of the enzyme derivative was easily achieved without the prior inactivation of trypsin which had been regenerated during the elimination reaction. Comparative studies of the ligand interaction specificities with anhydrotrypsin and trypsin confirmed the stronger interaction of the former protein with product-type ligands such as Bz-Arg-OH. No marked differences were observed between them in affinities toward substrate-type ligands such as Bz-Arg-NH2. The higher affinity of anhydrotrypsin was found to be limited to product-type ligands of L-configuration, i.e., the protein displayed an ability to discriminate the L-ligand from its optical isomer. THE PKa value for the ionization form of anhydrotrypsin responsible for the interaction with Bz-Arg-OH was estimated to be 7.60+/-0907 | [
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|
PMID:16874 | Glutathione reductase in the sea urchin egg. III. Activation of the complex form by proteinases. | The G-200 flow-through fraction of the extract of sea urchin eggs contained a complex form of glutathione reductase (GR) [EC 1.6.4.2]. The complex was unstable and gradually dissociated with ain increase in GR activity. The activation was facilitated by high concentrations of EDTA, KCI or (NH4)2SO4. The rate of activation by salts was apparently dependent on the ionic strength. The complex form was also activated rather quickly by treatment with proteinases such as trypsin [EC 3.4.21.4], alpha-chymotrypsin [EC 3.4.21.1] or subtilisin [EC 3.4.21.14]. Trypsin caused the complex to release the free form of GR. Even after trypsin treatment, little change was observed in the dependence of the GR activity on GSSG or NADPH concentration. The GR activity of the complex form was not inhibited at all by 0.2 mM N-ethylmaleimide (NEM) in the presence of GSSG, but was reduced to 3% in the presence of NADPH. When excess NEM was sequestered with GSH, the NEM-treated complex form was strikingly activated by trypsin, while no activation was detected with the free form of enzyme pretreated with NEM. These results suggest that the active site of GR in the complex form is largely masked by a polypeptide moiety of theinhbitiory component. | Glutathione reductase in the sea urchin egg. III. Activation of the complex form by proteinases. The G-200 flow-through fraction of the extract of sea urchin eggs contained a complex form of glutathione reductase (GR) [EC 1.6.4.2]. The complex was unstable and gradually dissociated with ain increase in GR activity. The activation was facilitated by high concentrations of EDTA, KCI or (NH4)2SO4. The rate of activation by salts was apparently dependent on the ionic strength. The complex form was also activated rather quickly by treatment with proteinases such as trypsin [EC 3.4.21.4], alpha-chymotrypsin [EC 3.4.21.1] or subtilisin [EC 3.4.21.14]. Trypsin caused the complex to release the free form of GR. Even after trypsin treatment, little change was observed in the dependence of the GR activity on GSSG or NADPH concentration. The GR activity of the complex form was not inhibited at all by 0.2 mM N-ethylmaleimide (NEM) in the presence of GSSG, but was reduced to 3% in the presence of NADPH. When excess NEM was sequestered with GSH, the NEM-treated complex form was strikingly activated by trypsin, while no activation was detected with the free form of enzyme pretreated with NEM. These results suggest that the active site of GR in the complex form is largely masked by a polypeptide moiety of theinhbitiory component. | [
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|
PMID:16875 | A new enzyme, NADPH-dihydropteridine reductase in bovine liver. | An enzyme designated as NADPH-dihydropteridine reductase was found in the extract of bovine liver and partially purified. In contrast to NADH-dpendent dihydropteridine reductase [EC 1.6.99.7], the enzyme catalyzes the reduction of quinonid-dihydropterin to tetrahydropterin in the presence of NADPH. The two enzymes were separated by column chromatography on DEAE-sephadex. Tyrosine formation in the phenylalanine hydroxylation system was also stimulated by NADPH-dihydropteridine reductase. The existence of these two dihydropteridine reductases suggests that the tetrahydro from ofpteridine cofactor may be regenerated in two different ways in vivo. | A new enzyme, NADPH-dihydropteridine reductase in bovine liver. An enzyme designated as NADPH-dihydropteridine reductase was found in the extract of bovine liver and partially purified. In contrast to NADH-dpendent dihydropteridine reductase [EC 1.6.99.7], the enzyme catalyzes the reduction of quinonid-dihydropterin to tetrahydropterin in the presence of NADPH. The two enzymes were separated by column chromatography on DEAE-sephadex. Tyrosine formation in the phenylalanine hydroxylation system was also stimulated by NADPH-dihydropteridine reductase. The existence of these two dihydropteridine reductases suggests that the tetrahydro from ofpteridine cofactor may be regenerated in two different ways in vivo. | [
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|
PMID:16876 | Glycolysis of red cells suspended in solutions of impermeable solutes. Intracellular pH and glycolysis. | The glycolytic rate human red cells suspended in a sucrose medium of low or physiological pH was higher than that of the cells suspended in Ringer's medium of the same. pH. The medium pHP-glycolytic rate curve of red cells suspended in soucrose media shifted to the acidic side by about one unit compared with that of cells suspended in Ringer's medium. Similarly, the pattern of glycolytic intermediates in red cells suspended in a sucrose medium resembled that in cells suspended in Ringer's solution of about one unit higher pH. These phenomena could be ascribed to the change of intracellular pH, which was measured by the 5,5'-dimethyl-oxazolidine-2,4-dione method. A similar stimulation of glycolysis was observed when sodium citrate was added to red cells suspended in Ringer's solution at constant pH. These observations indicate that membrane-impermeable non-electrolytes or anions stimulate glycolysis of red cells by elevation ofthe intracellular pH. Red cell glycolysis is influenced mainly by the intracellular pH rather than by the pH of the suspending medium. | Glycolysis of red cells suspended in solutions of impermeable solutes. Intracellular pH and glycolysis. The glycolytic rate human red cells suspended in a sucrose medium of low or physiological pH was higher than that of the cells suspended in Ringer's medium of the same. pH. The medium pHP-glycolytic rate curve of red cells suspended in soucrose media shifted to the acidic side by about one unit compared with that of cells suspended in Ringer's medium. Similarly, the pattern of glycolytic intermediates in red cells suspended in a sucrose medium resembled that in cells suspended in Ringer's solution of about one unit higher pH. These phenomena could be ascribed to the change of intracellular pH, which was measured by the 5,5'-dimethyl-oxazolidine-2,4-dione method. A similar stimulation of glycolysis was observed when sodium citrate was added to red cells suspended in Ringer's solution at constant pH. These observations indicate that membrane-impermeable non-electrolytes or anions stimulate glycolysis of red cells by elevation ofthe intracellular pH. Red cell glycolysis is influenced mainly by the intracellular pH rather than by the pH of the suspending medium. | [
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|
PMID:16877 | Actin-induced local conformational change in the myosin molecule. I. Effect of metal ions and nucleotides on the conformational change around a specific thiol group (S2) of heavy meromyosin. | As previously reported when a specific thiol group, S2, of myosin reacts with N-ethylmaleimide (NEM), its Ca2+-ATPase activity is decreased. Therefore, the reactivity of S2 can be estimated by measuring the decrement of the enzymatic activity. Using the change in the reactivity as a structural probe, we investigated whether F-actin affects the conformation around the region containing S2 under physiological conditions (at neutral pH and low ionic strength). 1. Experiments were carried out with heavy meromyosin (HMM), S1 of which had heen blocked with NEM, to observe the reactivity of S2 alone. In the experiments done in the presence of F-actin, the Ca2+-ATPase activity was measured using the heavy meromyosin fraction after actin had been removed by centrifugation and gel filtration. 2. ATP and other nucleotides activated the reactivity of S2 in the presence of Mg2+. On the other hand, F-actin markedly activated the reactivity of S2 which had been increased by ATP, but not by the other nucleotides. 3. The above cooperative action of F-actin with ATP was not observed in the presence of Ca2+ instead of Mg2+, or above 0.2 M KCl. These results suggest that the S2 region of the myosin molecule is a key region in the molecular interaction of the actin myosin-ATP system under physiological conditions. | Actin-induced local conformational change in the myosin molecule. I. Effect of metal ions and nucleotides on the conformational change around a specific thiol group (S2) of heavy meromyosin. As previously reported when a specific thiol group, S2, of myosin reacts with N-ethylmaleimide (NEM), its Ca2+-ATPase activity is decreased. Therefore, the reactivity of S2 can be estimated by measuring the decrement of the enzymatic activity. Using the change in the reactivity as a structural probe, we investigated whether F-actin affects the conformation around the region containing S2 under physiological conditions (at neutral pH and low ionic strength). 1. Experiments were carried out with heavy meromyosin (HMM), S1 of which had heen blocked with NEM, to observe the reactivity of S2 alone. In the experiments done in the presence of F-actin, the Ca2+-ATPase activity was measured using the heavy meromyosin fraction after actin had been removed by centrifugation and gel filtration. 2. ATP and other nucleotides activated the reactivity of S2 in the presence of Mg2+. On the other hand, F-actin markedly activated the reactivity of S2 which had been increased by ATP, but not by the other nucleotides. 3. The above cooperative action of F-actin with ATP was not observed in the presence of Ca2+ instead of Mg2+, or above 0.2 M KCl. These results suggest that the S2 region of the myosin molecule is a key region in the molecular interaction of the actin myosin-ATP system under physiological conditions. | [
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|
PMID:16878 | Ciliary dynein from sea urchin embryos. | Axonemal dynein ATPase [EC 3.6.1.3] was extracted from cilia of sea urchin embryos for a study of its enzymatic properties. Sedimentation analysis on a sucrose density gradient revealed that ATPase activity was associated with the 12S particles. The partially purified 12S enzyme was characterized mainly with regard to the optimum pH, divalent cation and ionic strength requirments and substrate specificity. Comparative investigation of the data obtained indicates that the properties of the present dyneine ATPase resemble those of other dynein(-like) ATPase hitherto reported. In addition, the possible relationship among dyneins within a single species, in particular between the ciliary dynein and cytoplasmic dynein-like ATPase, is discussed. | Ciliary dynein from sea urchin embryos. Axonemal dynein ATPase [EC 3.6.1.3] was extracted from cilia of sea urchin embryos for a study of its enzymatic properties. Sedimentation analysis on a sucrose density gradient revealed that ATPase activity was associated with the 12S particles. The partially purified 12S enzyme was characterized mainly with regard to the optimum pH, divalent cation and ionic strength requirments and substrate specificity. Comparative investigation of the data obtained indicates that the properties of the present dyneine ATPase resemble those of other dynein(-like) ATPase hitherto reported. In addition, the possible relationship among dyneins within a single species, in particular between the ciliary dynein and cytoplasmic dynein-like ATPase, is discussed. | [
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|
PMID:16879 | Amino acid sequences around 1, 2-epoxy-3-(p-nitrophenoxy)propane-reactive residues in rhizopus chinensis acid protease: homology with pepsin and rennin. | Two different peptides containing an aspartyl residue reactive with 1, 2-epoxy-3-(p-nitrophenoxy)propane (EPNP) in the acid protease from Rhizopus chinensis were isolated from a peptic digest of the EPNP-modified enzyme. One of the peptides was sequenced as Asp-Thr-Gly-Ser-Asp. The amino acid sequence had very high homology with those around the EPNP-reactive aspartyl residues in rennin (chymosin) [EC 3.4.23.4] and pepsin [EC 3.4.23.1]. The other peptide contained no methionine residue and gave the sequence: Asp-Thr-Gly-Thr-Thr-Leu. The N-terminal aspartyl residue of each peptide was deduced to be the EPNP-reactive site. | Amino acid sequences around 1, 2-epoxy-3-(p-nitrophenoxy)propane-reactive residues in rhizopus chinensis acid protease: homology with pepsin and rennin. Two different peptides containing an aspartyl residue reactive with 1, 2-epoxy-3-(p-nitrophenoxy)propane (EPNP) in the acid protease from Rhizopus chinensis were isolated from a peptic digest of the EPNP-modified enzyme. One of the peptides was sequenced as Asp-Thr-Gly-Ser-Asp. The amino acid sequence had very high homology with those around the EPNP-reactive aspartyl residues in rennin (chymosin) [EC 3.4.23.4] and pepsin [EC 3.4.23.1]. The other peptide contained no methionine residue and gave the sequence: Asp-Thr-Gly-Thr-Thr-Leu. The N-terminal aspartyl residue of each peptide was deduced to be the EPNP-reactive site. | [
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PMID:16880 | Phosphoenolypyruvate synthetase of Escherichia coli: molecular weight, subunit composition, and identification of phosphohistidine in phosphoenzyme intermediate. | Phosphoenolypyruvate synthetase of Escherichia coli has been shown to be a dimer of molecular weight 150,000. The constituent subunits appear to be identical. The enzyme tends to dissociate to monomers at low protein concentration, but the tendency is much diminished in the phosphoenzyme form, suggesting that enzyme phosphorylation is accompanied by a structural rearrangement in the subunit contact domain. The enzyme appears to show half of the sites reactivity with respect to its phosphorylation by ATP. Several lines of evidence, including identification of 3-phosphohistidine in alkaline digests of the phosphoenzyme, indicate that a histidyl residue is the site of phosphorylation. | Phosphoenolypyruvate synthetase of Escherichia coli: molecular weight, subunit composition, and identification of phosphohistidine in phosphoenzyme intermediate. Phosphoenolypyruvate synthetase of Escherichia coli has been shown to be a dimer of molecular weight 150,000. The constituent subunits appear to be identical. The enzyme tends to dissociate to monomers at low protein concentration, but the tendency is much diminished in the phosphoenzyme form, suggesting that enzyme phosphorylation is accompanied by a structural rearrangement in the subunit contact domain. The enzyme appears to show half of the sites reactivity with respect to its phosphorylation by ATP. Several lines of evidence, including identification of 3-phosphohistidine in alkaline digests of the phosphoenzyme, indicate that a histidyl residue is the site of phosphorylation. | [
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|
PMID:16881 | Source of residual Bohr effect in hemoglobin oxidation. | The hemoglobin oxidation Bohr effect is larger than the ligation Bohr effect, even when the former is corrected for any ionization of the water molecule bound to the ferric iron of methemoglobin. This residual oxidation Bohr effect is here shown to be solely caused by the influence of the positively charged ferriheme, and is abolished when the oxidized heme binds an anion. This result frees the formal equivalence of hemoglobin ligation and oxidation from the last apparent experimental discrepancy. | Source of residual Bohr effect in hemoglobin oxidation. The hemoglobin oxidation Bohr effect is larger than the ligation Bohr effect, even when the former is corrected for any ionization of the water molecule bound to the ferric iron of methemoglobin. This residual oxidation Bohr effect is here shown to be solely caused by the influence of the positively charged ferriheme, and is abolished when the oxidized heme binds an anion. This result frees the formal equivalence of hemoglobin ligation and oxidation from the last apparent experimental discrepancy. | [
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|
PMID:16883 | Magnetic resonance studies of concanavalin A: assignment of histidine resonances in 220 MHz proton spectrum of complexes with Co2+ and Zn2+. | The low field regions of the 220 MHz proton magnetic resonance spectra of concanavalin A (Con A) complexes with metal ions show well resolved resonances from the C2 protons of histidine side chains. Shifts of these resonances are observed when Zn2+ ions at the transition metal ion binding site, S1, are replaced by CO2 ions. The magnitude of these shifts can be used to determine the orientation of axis of anisotropy of the Co2+ ligand field since the distances from the C2 protons of the histidines to S1 can be computed from the crystal structure coordinates. Assignment of the separate peaks in the spectrum of the Con A-Co2+-Ca2+ complex and of the Con A-Zn2+-Ca2+ complex, to particular histidines in the amino acid sequence of Con A then follows. The refined crystal coordinates of both Reeke et al. (Reeke, G. N., Jr., Becker, J. W., and Edelman, G. M. (1975) J. Biol. Chem, 250, 1525-1547) and of Hardman and Ainsworth (private communication) have been used. These two sets of coordinates both yield orientations for the axis of anisotropy which are approximately in the direction of the His 24 nitrogen ligand. | Magnetic resonance studies of concanavalin A: assignment of histidine resonances in 220 MHz proton spectrum of complexes with Co2+ and Zn2+. The low field regions of the 220 MHz proton magnetic resonance spectra of concanavalin A (Con A) complexes with metal ions show well resolved resonances from the C2 protons of histidine side chains. Shifts of these resonances are observed when Zn2+ ions at the transition metal ion binding site, S1, are replaced by CO2 ions. The magnitude of these shifts can be used to determine the orientation of axis of anisotropy of the Co2+ ligand field since the distances from the C2 protons of the histidines to S1 can be computed from the crystal structure coordinates. Assignment of the separate peaks in the spectrum of the Con A-Co2+-Ca2+ complex and of the Con A-Zn2+-Ca2+ complex, to particular histidines in the amino acid sequence of Con A then follows. The refined crystal coordinates of both Reeke et al. (Reeke, G. N., Jr., Becker, J. W., and Edelman, G. M. (1975) J. Biol. Chem, 250, 1525-1547) and of Hardman and Ainsworth (private communication) have been used. These two sets of coordinates both yield orientations for the axis of anisotropy which are approximately in the direction of the His 24 nitrogen ligand. | [
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PMID:16885 | Bovine adrenal tyrosine hydroxylase: purification and properties. | Bovine adrenal tyrosine hydroxylase has been obtained in a form that is 85 to 90% pure. Sodium dodecyl sulfate-gel electrophoresis and density gradient centrifugation studies have established that the subunit molecular weight of the chymotrypsin-solubilized enzyme is 34,000. The presence of iron in the purified enzyme (0.50 to 0.75 mol of iron/mol of enzyme) has been established. Crude particulate tyrosine hydroxylase can be activated by the phospholipid, phosphatidyl-L-serine, or by exposure to enzymatic phosphorylating conditions. Both forms of activation lower the Km of the enzyme for its 2-amino-4-hydroxypteridine cofactor. By contrast, tyrosine hydroxylase that has been solubilized by chymotrypsin cannot be activated by either of these methods. | Bovine adrenal tyrosine hydroxylase: purification and properties. Bovine adrenal tyrosine hydroxylase has been obtained in a form that is 85 to 90% pure. Sodium dodecyl sulfate-gel electrophoresis and density gradient centrifugation studies have established that the subunit molecular weight of the chymotrypsin-solubilized enzyme is 34,000. The presence of iron in the purified enzyme (0.50 to 0.75 mol of iron/mol of enzyme) has been established. Crude particulate tyrosine hydroxylase can be activated by the phospholipid, phosphatidyl-L-serine, or by exposure to enzymatic phosphorylating conditions. Both forms of activation lower the Km of the enzyme for its 2-amino-4-hydroxypteridine cofactor. By contrast, tyrosine hydroxylase that has been solubilized by chymotrypsin cannot be activated by either of these methods. | [
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PMID:16888 | Isolation of glutamic acid methyl ester from an Escherichia coli membrane protein involved in chemotaxis. | We have isolated glutamic acid 5-methyl ester from an Escherichia coli protein that is involved in chemotaxis. The bacteria were first incubated with [methyl-3H]methionine under conditions which are known to result in methylation of the protein. The protein, isolated by gel electrophoresis, was then digested by successive treatment with three proteolytic enzymes. One of the products was [methyl-3H]glutamic acid 5-methyl ester, identified by comparison with an authentic sample in the following studies: (a) chromatography on an automatic amino acid analyzer, (b) chromatography on paper in two solvent systems, (c) chromatography on paper of the N-acetyl derivatives, and (d) stability of the ester bond to various pH conditions. No aspartic acid 4-methyl ester was found in the enzymatic digest. Treatment of the methylated protein with alkali released the radioactivity as [3H]methanol, which was identified by gas chromatography and by preparation of the 3,5-dinitrobenzoate. | Isolation of glutamic acid methyl ester from an Escherichia coli membrane protein involved in chemotaxis. We have isolated glutamic acid 5-methyl ester from an Escherichia coli protein that is involved in chemotaxis. The bacteria were first incubated with [methyl-3H]methionine under conditions which are known to result in methylation of the protein. The protein, isolated by gel electrophoresis, was then digested by successive treatment with three proteolytic enzymes. One of the products was [methyl-3H]glutamic acid 5-methyl ester, identified by comparison with an authentic sample in the following studies: (a) chromatography on an automatic amino acid analyzer, (b) chromatography on paper in two solvent systems, (c) chromatography on paper of the N-acetyl derivatives, and (d) stability of the ester bond to various pH conditions. No aspartic acid 4-methyl ester was found in the enzymatic digest. Treatment of the methylated protein with alkali released the radioactivity as [3H]methanol, which was identified by gas chromatography and by preparation of the 3,5-dinitrobenzoate. | [
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PMID:16889 | Induction of 3-hydroxy-3-methylglutaryl coenzyme A reductase in HeLa cells by glucocorticoids. | The activity of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase, EC 1.1.1.34) has been demonstrated both in homogenates and microsomes of the S3G strain of HeLa cells. It was increased 8- to 10-fold by the removal of serum from the growth medium. The presence of steroids, specifically of the glucocorticoid series, in the serum-less growth medium elicited an additional 100 to 345% increase over the serum-less control, whereas the addition of N6,O2'-dibutyryl adenosine 3':5'-monophosphate to the medium or dexamethasone to the assay mixture was without any stimulatory effect. Both inductions were blocked by cycloheximide and actinomycin D, suggesting a protein synthesis-dependent elevation of enzyme activity. Glucocorticoids were effective in the induction at concentrations ranging from 10(-6) to 10(-8) M and there was a demonstrated parallel between the magnitude of enzyme induction and glucocorticoid potency. The HMG-CoA reductase activities from steroid-induced and control cultures had identical assay characteristics (pH optima and apparent Km values for both NADPH and HMG-CoA). This induction of the rate-controlling enzyme of cholesterogenesis occurred despite the observation that glucocorticoids specifically depress the rate of acetate or water, but not mevalonate, incorporation into cholesterol. | Induction of 3-hydroxy-3-methylglutaryl coenzyme A reductase in HeLa cells by glucocorticoids. The activity of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase, EC 1.1.1.34) has been demonstrated both in homogenates and microsomes of the S3G strain of HeLa cells. It was increased 8- to 10-fold by the removal of serum from the growth medium. The presence of steroids, specifically of the glucocorticoid series, in the serum-less growth medium elicited an additional 100 to 345% increase over the serum-less control, whereas the addition of N6,O2'-dibutyryl adenosine 3':5'-monophosphate to the medium or dexamethasone to the assay mixture was without any stimulatory effect. Both inductions were blocked by cycloheximide and actinomycin D, suggesting a protein synthesis-dependent elevation of enzyme activity. Glucocorticoids were effective in the induction at concentrations ranging from 10(-6) to 10(-8) M and there was a demonstrated parallel between the magnitude of enzyme induction and glucocorticoid potency. The HMG-CoA reductase activities from steroid-induced and control cultures had identical assay characteristics (pH optima and apparent Km values for both NADPH and HMG-CoA). This induction of the rate-controlling enzyme of cholesterogenesis occurred despite the observation that glucocorticoids specifically depress the rate of acetate or water, but not mevalonate, incorporation into cholesterol. | [
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|
PMID:16891 | Purification and properties of a plant endonuclease specific for apurinic sites. | An endonuclease which hydrolyzes depurinated DNA has been isolated from Phaseolus multiflorus enbryos; it has a molecular weight around 40,000. The enzyme is specific for apurinic sites; it has no action on normal DNA strands or on alkylated sites, and is without exonulcease activity. The rate of phosphoester bond hydrolysis near apurinic sites is far greater in native than in denatured DNA. The endonuclease is not inactivated by 10 mM EDTA, but is activity is however stimulated by Mg2+ or Mn2+. Its optimum pH is 7.5 to 8.0, and its optimum temperature 40degrees although, at this temperature, it is rapidly denatured; even low NaCl concentrations inhibit the enzyme activity. The endonuclease for apurinic sites of P. multiflorus is a non-histone protein of chromatin; the properties (like thermosensitivity of susceptibility to ionic strength) of the enzyme in situ, working on chromatin DNA, might be different from those described for the isolated endonuclease in homogenous aqueous solution. | Purification and properties of a plant endonuclease specific for apurinic sites. An endonuclease which hydrolyzes depurinated DNA has been isolated from Phaseolus multiflorus enbryos; it has a molecular weight around 40,000. The enzyme is specific for apurinic sites; it has no action on normal DNA strands or on alkylated sites, and is without exonulcease activity. The rate of phosphoester bond hydrolysis near apurinic sites is far greater in native than in denatured DNA. The endonuclease is not inactivated by 10 mM EDTA, but is activity is however stimulated by Mg2+ or Mn2+. Its optimum pH is 7.5 to 8.0, and its optimum temperature 40degrees although, at this temperature, it is rapidly denatured; even low NaCl concentrations inhibit the enzyme activity. The endonuclease for apurinic sites of P. multiflorus is a non-histone protein of chromatin; the properties (like thermosensitivity of susceptibility to ionic strength) of the enzyme in situ, working on chromatin DNA, might be different from those described for the isolated endonuclease in homogenous aqueous solution. | [
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|
PMID:16892 | Estrogen-binding protein from rat preputial gland: purification and characterization. | Cytosol from the rat preputial gland has been shown to contain a protein which binds both estrone and estradiol. The protein, after a 26-fold purification from the cytosol of female Sprague-Dawley rats, migrated as one band during electrophoresis in sodium dodecyl sulfate on acrylamide gel. The electrophoretic mobility indicated a molecular weight of 15,000. The association constant for estrone as determined by equilibrium dialysis was 1.2 X 10(7) M-1, while that for 17beta-estradiol was 3.3 X 10(6) M-1. Progesterone, cortisol, testosterone, or diethylstilbestrol did not bind to the purified protein, whereas 17alpha-estradiol or estriol bound only slightly. In the presence of retinoic acid, but not retinol, the binding of estrone was reduced. Optimum binding for estrone was at pH 6.5 to 8.5. | Estrogen-binding protein from rat preputial gland: purification and characterization. Cytosol from the rat preputial gland has been shown to contain a protein which binds both estrone and estradiol. The protein, after a 26-fold purification from the cytosol of female Sprague-Dawley rats, migrated as one band during electrophoresis in sodium dodecyl sulfate on acrylamide gel. The electrophoretic mobility indicated a molecular weight of 15,000. The association constant for estrone as determined by equilibrium dialysis was 1.2 X 10(7) M-1, while that for 17beta-estradiol was 3.3 X 10(6) M-1. Progesterone, cortisol, testosterone, or diethylstilbestrol did not bind to the purified protein, whereas 17alpha-estradiol or estriol bound only slightly. In the presence of retinoic acid, but not retinol, the binding of estrone was reduced. Optimum binding for estrone was at pH 6.5 to 8.5. | [
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PMID:16894 | Properties of chitin synthetase in isolated chitosomes from yeast cells of Mucor rouxii. | Chitin synthetase was isolated and purified 120-fold from the supernatant fraction (54,500 X g) of broken yeast cells of Mucor rouxii. The purified preparations consisted mainly of chitin synthetase particles (chitosomes) with an average size larger than 7 X 10(6) daltons (by gel filtration) and an average sedimentation coefficient of 105 S. The samples also contained other enzyme complexes (fatty acid synthetase, pyruvate dehydrogenase, and, depending on method, ribosomes). Nearly all of the chitosomal chitin synthetase occurred in a zymogenic form that required proteolytic activation. In most properties, the chitosomal enzyme was similar to crude enzyme (54,000 X g sediment): kinetics, activation by proteases, response to metals, stimulation by N-acetylglucosamine, and inhibition by polyoxin or UDP. One mamor difference was the much greater stability of the chitosomal chitin synthetase zymogen against spontaneous activation and destruction. Product (chitin microfibril) and enzyme (chitin synthetase) remained associated in a complex that was readily separated by centrifugation. | Properties of chitin synthetase in isolated chitosomes from yeast cells of Mucor rouxii. Chitin synthetase was isolated and purified 120-fold from the supernatant fraction (54,500 X g) of broken yeast cells of Mucor rouxii. The purified preparations consisted mainly of chitin synthetase particles (chitosomes) with an average size larger than 7 X 10(6) daltons (by gel filtration) and an average sedimentation coefficient of 105 S. The samples also contained other enzyme complexes (fatty acid synthetase, pyruvate dehydrogenase, and, depending on method, ribosomes). Nearly all of the chitosomal chitin synthetase occurred in a zymogenic form that required proteolytic activation. In most properties, the chitosomal enzyme was similar to crude enzyme (54,000 X g sediment): kinetics, activation by proteases, response to metals, stimulation by N-acetylglucosamine, and inhibition by polyoxin or UDP. One mamor difference was the much greater stability of the chitosomal chitin synthetase zymogen against spontaneous activation and destruction. Product (chitin microfibril) and enzyme (chitin synthetase) remained associated in a complex that was readily separated by centrifugation. | [
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PMID:16896 | DNA polymerase of mitochondria is a gamma-polymerase. | Mitochondria isolated from rat liver cells or mycoplasma-free HeLa cells contain a single DNA polymerase activity which is closely related to, or identical to, the DNA polymerase gamma activity found in the homologous cell. In rat liver cells, about 16% of the total cytoplasmic gamma-polymerase activity is found associated with mitochondria and in HeLa cells about 20% of the total cellular gamma-polymerase is mitochondria associated. Since mitochondria possess no unique DNA polymerase activity, the number of DNA polymerases now known in mammalian cells is reduced, from the previously proposed four enzymes, to three--DNA polymerases alpha, beta, and gamma. | DNA polymerase of mitochondria is a gamma-polymerase. Mitochondria isolated from rat liver cells or mycoplasma-free HeLa cells contain a single DNA polymerase activity which is closely related to, or identical to, the DNA polymerase gamma activity found in the homologous cell. In rat liver cells, about 16% of the total cytoplasmic gamma-polymerase activity is found associated with mitochondria and in HeLa cells about 20% of the total cellular gamma-polymerase is mitochondria associated. Since mitochondria possess no unique DNA polymerase activity, the number of DNA polymerases now known in mammalian cells is reduced, from the previously proposed four enzymes, to three--DNA polymerases alpha, beta, and gamma. | [
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PMID:16897 | Characterization of plasma membrane adenosine triphosphatase of Neurospora crassa. | It has been proposed (Slayman, C.L., Long W.S., and Lu, C.Y.-H. (1973) J. Membr. Biol. 14, 305--338) that in Neurospora crassa, a plasma membrane ATPase functions to pump H+ ions out of the cell, thereby generating an electrochemical gradient that can drive transport processes. Using the concanavalin A method of Scarborough (Scarborough G.A. (1975)J. Biol. Chem. 250, 1106--1111), we have prepared plasma membranes of Neurospora and have deomonstrated that they do contain a distinct ATPase activity with the following properties. It has a pH optimum of 6.0, is highly specific for ATP (hydrolyzing other nucleoside triphosphates less than 6% as rapidly), requires Mg2+ at concentrations approximately equimolar to the concentration of ATP, is weakly stimulated by certain monovalent cations (K+ and NH4+) and anions (SCN- and acetate), is inhibited by N,N'-dicyclohexylcarbodiimide, but is not affected by oligomycin or ouabain. The plasma membrane fraction also contains residual mitochondrial contamination, which can be determined quantitatively by assaying oligomycin-sensitive ATP-ase activity, at pH 8.25, and succinic dehydrogenase activity. | Characterization of plasma membrane adenosine triphosphatase of Neurospora crassa. It has been proposed (Slayman, C.L., Long W.S., and Lu, C.Y.-H. (1973) J. Membr. Biol. 14, 305--338) that in Neurospora crassa, a plasma membrane ATPase functions to pump H+ ions out of the cell, thereby generating an electrochemical gradient that can drive transport processes. Using the concanavalin A method of Scarborough (Scarborough G.A. (1975)J. Biol. Chem. 250, 1106--1111), we have prepared plasma membranes of Neurospora and have deomonstrated that they do contain a distinct ATPase activity with the following properties. It has a pH optimum of 6.0, is highly specific for ATP (hydrolyzing other nucleoside triphosphates less than 6% as rapidly), requires Mg2+ at concentrations approximately equimolar to the concentration of ATP, is weakly stimulated by certain monovalent cations (K+ and NH4+) and anions (SCN- and acetate), is inhibited by N,N'-dicyclohexylcarbodiimide, but is not affected by oligomycin or ouabain. The plasma membrane fraction also contains residual mitochondrial contamination, which can be determined quantitatively by assaying oligomycin-sensitive ATP-ase activity, at pH 8.25, and succinic dehydrogenase activity. | [
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PMID:16898 | Identification of folate binding macromolecule in rabbit choroid plexus. | A macromolecular binder of folic acid and folic acid derivatives has been identified in the particulate fraction of homogenates of rabbit choroid plexus. Within the choroid plexus, there are 2.3 nmol of folate-binding activity (binder) per g of tissue. The molecular weight of the folate binder complex, separated from the particulate fraction after solubilization with Triton X-100, was 340,000 to 400,000 by Sephadex gel filtration. The partially purified binder, when freed of endogenous folates, bound equivalent amounts of both [3H]folic acid and [methyl-14C]methyltetrahydrofolic acid per mg of protein. Folic acid, homofolic acid, 5-methyltetrahydrofolic acid, and to a lesser degree, methotrexate, inhibited the binding of both [3H]folic acid and [14C]methyltetrahydrofolic acid. Binding activity, which decreased below pH = 7.0, was unaffected by pretreatment with ribonuclease but was eliminated completely by papain and a protease (Streptomyces griseus). Although dihydrofolate reductase was present in choroid plexus, the binder was distinct from dihydrofolate reductase as judged by gel filtration and methotrexate sensitivity. This high affinity binder of folates may be responsible, in part, for the rapid, saturable uptake of folic acid and methyltetrahydrofolic acid by rabbit choroid plexus in vitro. | Identification of folate binding macromolecule in rabbit choroid plexus. A macromolecular binder of folic acid and folic acid derivatives has been identified in the particulate fraction of homogenates of rabbit choroid plexus. Within the choroid plexus, there are 2.3 nmol of folate-binding activity (binder) per g of tissue. The molecular weight of the folate binder complex, separated from the particulate fraction after solubilization with Triton X-100, was 340,000 to 400,000 by Sephadex gel filtration. The partially purified binder, when freed of endogenous folates, bound equivalent amounts of both [3H]folic acid and [methyl-14C]methyltetrahydrofolic acid per mg of protein. Folic acid, homofolic acid, 5-methyltetrahydrofolic acid, and to a lesser degree, methotrexate, inhibited the binding of both [3H]folic acid and [14C]methyltetrahydrofolic acid. Binding activity, which decreased below pH = 7.0, was unaffected by pretreatment with ribonuclease but was eliminated completely by papain and a protease (Streptomyces griseus). Although dihydrofolate reductase was present in choroid plexus, the binder was distinct from dihydrofolate reductase as judged by gel filtration and methotrexate sensitivity. This high affinity binder of folates may be responsible, in part, for the rapid, saturable uptake of folic acid and methyltetrahydrofolic acid by rabbit choroid plexus in vitro. | [
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|
PMID:16900 | Repressible alkaline phosphatase from Thermus aquaticus: associated phosphodiesterase activity. | A repressible alkaline phosphatase has been isolated from the extreme bacterial thermophile. Thermus aquaticus, and has been purified to homogeneity as judged by disc acrylamide electrophoresis and sodium dodecyl sulfate electrophoresis. Upon investigation, the purified enzyme was shown to hydrolyze certain phosphodiesters in addition to a wide variety of phosphomonoesters. The diesters included bis-p-nitro-phenyl phosphate and thymidine 3'-monophospho-p-nitro-phenyl ester. The temperature optimum for the diesterase activity was 80--85 degrees at pH 7.2. Orthophosphate competitively inhibited both activities. Nucleotides such as AMP, ADP, and ATP also inhibited both esterase activities as did alpha-D-glucose 1-phosphate and alpha-sodium glycerol phosphate. The isoelectric point of the enzyme was determined to be 8.4. | Repressible alkaline phosphatase from Thermus aquaticus: associated phosphodiesterase activity. A repressible alkaline phosphatase has been isolated from the extreme bacterial thermophile. Thermus aquaticus, and has been purified to homogeneity as judged by disc acrylamide electrophoresis and sodium dodecyl sulfate electrophoresis. Upon investigation, the purified enzyme was shown to hydrolyze certain phosphodiesters in addition to a wide variety of phosphomonoesters. The diesters included bis-p-nitro-phenyl phosphate and thymidine 3'-monophospho-p-nitro-phenyl ester. The temperature optimum for the diesterase activity was 80--85 degrees at pH 7.2. Orthophosphate competitively inhibited both activities. Nucleotides such as AMP, ADP, and ATP also inhibited both esterase activities as did alpha-D-glucose 1-phosphate and alpha-sodium glycerol phosphate. The isoelectric point of the enzyme was determined to be 8.4. | [
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|
PMID:16904 | Specificity of 2-keto-3-deoxygluconate-6-P aldolase for open chain form of 2-keto-3-deoxygluconate-6-P. | 2-Keto-3-deoxygluconate-6-P exists as an euqilibrium of three forms at 25 degrees measurable by 13C NMR: alpha-furanose anomer (41%), beta-furanose anomer (50%), and open chain keto (9%). The three forms are interconverted rapidly (greater than 0.5 s-1) so that the unidirectional rates of furanose ring opening and closing can be quantitated by an NMR line broadening method. The 2-keto-3-deoxygluconate aldolase is specific for only one of these forms, the open chain keto form. The rates for ring opening calculated from the rapid kinetic enzyme system compare closely with those obtained with the NMR method. | Specificity of 2-keto-3-deoxygluconate-6-P aldolase for open chain form of 2-keto-3-deoxygluconate-6-P. 2-Keto-3-deoxygluconate-6-P exists as an euqilibrium of three forms at 25 degrees measurable by 13C NMR: alpha-furanose anomer (41%), beta-furanose anomer (50%), and open chain keto (9%). The three forms are interconverted rapidly (greater than 0.5 s-1) so that the unidirectional rates of furanose ring opening and closing can be quantitated by an NMR line broadening method. The 2-keto-3-deoxygluconate aldolase is specific for only one of these forms, the open chain keto form. The rates for ring opening calculated from the rapid kinetic enzyme system compare closely with those obtained with the NMR method. | [
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|
PMID:16907 | Effect of covalent attachment of polyethylene glycol on immunogenicity and circulating life of bovine liver catalase. | Methoxypolyethylene glycols of 1900 daltons (PEG-1900) or 5000 daltons (PEG-5000) were covalently attached to bovine liver catalase using 2,4,6-trichloro-s-triazine as the coupling agent. Rabbits were immunized by the intravenous and intramuscular routes with catalase modified by covalent attachment of PEG-1900 to 43% of the amino groups (PEG-1900-catalase). The intravenous antiserum did not yield detectable antibodies against PEG-1900-catalase or native catalase, as determined by Ouchterlony and complement fixation methods, whereas the intramuscular antiserum contained antibodies to both PEG-1900-catalase and catalase. PEG-1900 did not react with either antiserum. Catalase was prepared in which PEG-5000 was attached to 40% of the amino groups (PEG-5000-catalase). This catalase preparation did not react with either antiserum. PEG-1900-catalase retained 93% of its enzymatic activity; PEG-5000-catalase retained 95%. PEG-5000-catalase resisted digestion by trypsin, chymotrypsin, and a protease from Streptomyces griseus. PEG-1900-catalase and PEG-5000-catalase exhibited enhanced circulating lives in the blood of acatalasemic mice during repetitive intravenous injections. No evidence was seen of an immune response to injections of the modified enzymes. Mice injected repetitively with PEG-5000-catalase remained immune competent for unmodieied catalase, and no evidence of tissue or organ damage was seen. | Effect of covalent attachment of polyethylene glycol on immunogenicity and circulating life of bovine liver catalase. Methoxypolyethylene glycols of 1900 daltons (PEG-1900) or 5000 daltons (PEG-5000) were covalently attached to bovine liver catalase using 2,4,6-trichloro-s-triazine as the coupling agent. Rabbits were immunized by the intravenous and intramuscular routes with catalase modified by covalent attachment of PEG-1900 to 43% of the amino groups (PEG-1900-catalase). The intravenous antiserum did not yield detectable antibodies against PEG-1900-catalase or native catalase, as determined by Ouchterlony and complement fixation methods, whereas the intramuscular antiserum contained antibodies to both PEG-1900-catalase and catalase. PEG-1900 did not react with either antiserum. Catalase was prepared in which PEG-5000 was attached to 40% of the amino groups (PEG-5000-catalase). This catalase preparation did not react with either antiserum. PEG-1900-catalase retained 93% of its enzymatic activity; PEG-5000-catalase retained 95%. PEG-5000-catalase resisted digestion by trypsin, chymotrypsin, and a protease from Streptomyces griseus. PEG-1900-catalase and PEG-5000-catalase exhibited enhanced circulating lives in the blood of acatalasemic mice during repetitive intravenous injections. No evidence was seen of an immune response to injections of the modified enzymes. Mice injected repetitively with PEG-5000-catalase remained immune competent for unmodieied catalase, and no evidence of tissue or organ damage was seen. | [
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|
PMID:16908 | Human thrombins. Production, evaluation, and properties of alpha-thrombin. | Human alpha-thrombin, the thromboplastin activation product of prothrombin with high clotting and esterase activity, was produced from Cohn Fraction III paste. The procedure started with 0.4 to 3.2 kg of frozen paste and was completed in 2 or 3 days. Some 23 g of thrombin were recorded for 65 quantitated preparations made from 11 lots of Fraction III paste. These preparations were obtained at protein concentrations of 3.9 +/- 1.3 mg/ml with a yield of 340 +/- 110 mg/kg of paste, which represented 48 +/- 14% of the clotting potential extracted as prothrombin. They had specific clotting activities of 2.8 +/- 0.4 U.S. (NIH) units/microng of protein and titrated to 88 +/- 8% active with p-nitrophenyl-p'-guanidinobenzoate (NPGB). Those (N - 29) examined by labeling with [14C]diisopropyl phosphorofluoridate (iPr2P-F) and electrophoresing in sodium dodecyl sulfate (SDS)-polyacrylamide gels were found to contain only (N = 4) or predominantly alpha-thrombin (97 +/- 3%) and corresponding amounts of ists degradation product, beta-thrombin (2.6 +/- 3.1%). No plasmin(ogen), prothrombin complex factors (II, VII, IX, IXalpha, X, Xalpha), or prothrombin fragments were detected in representative preparations. As produced in 0.75 M NaCl, pH approximately 6, thrombin was stable for approximately 1 week at 4 degrees and for greater than 1 year at less than or equal to 50 degrees; freeze-dried thrombin stored at 4 degrees for greater than 1 year displayed stable clotting activity and no vial to vial variation, permitting its use for reference purposes. Human thrombin generated by Taipan snake venom activation was compared with that produced by rapid thromboplastin activation: after treatment with [14C]iPr2P-F, greater than 95% of the label in both thrombins migrated at the same rate during electrophoresis in SDS; identical pairs of NH2-terminal residues were released in three consecutive Edman degradation cycles. | Human thrombins. Production, evaluation, and properties of alpha-thrombin. Human alpha-thrombin, the thromboplastin activation product of prothrombin with high clotting and esterase activity, was produced from Cohn Fraction III paste. The procedure started with 0.4 to 3.2 kg of frozen paste and was completed in 2 or 3 days. Some 23 g of thrombin were recorded for 65 quantitated preparations made from 11 lots of Fraction III paste. These preparations were obtained at protein concentrations of 3.9 +/- 1.3 mg/ml with a yield of 340 +/- 110 mg/kg of paste, which represented 48 +/- 14% of the clotting potential extracted as prothrombin. They had specific clotting activities of 2.8 +/- 0.4 U.S. (NIH) units/microng of protein and titrated to 88 +/- 8% active with p-nitrophenyl-p'-guanidinobenzoate (NPGB). Those (N - 29) examined by labeling with [14C]diisopropyl phosphorofluoridate (iPr2P-F) and electrophoresing in sodium dodecyl sulfate (SDS)-polyacrylamide gels were found to contain only (N = 4) or predominantly alpha-thrombin (97 +/- 3%) and corresponding amounts of ists degradation product, beta-thrombin (2.6 +/- 3.1%). No plasmin(ogen), prothrombin complex factors (II, VII, IX, IXalpha, X, Xalpha), or prothrombin fragments were detected in representative preparations. As produced in 0.75 M NaCl, pH approximately 6, thrombin was stable for approximately 1 week at 4 degrees and for greater than 1 year at less than or equal to 50 degrees; freeze-dried thrombin stored at 4 degrees for greater than 1 year displayed stable clotting activity and no vial to vial variation, permitting its use for reference purposes. Human thrombin generated by Taipan snake venom activation was compared with that produced by rapid thromboplastin activation: after treatment with [14C]iPr2P-F, greater than 95% of the label in both thrombins migrated at the same rate during electrophoresis in SDS; identical pairs of NH2-terminal residues were released in three consecutive Edman degradation cycles. | [
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|
PMID:16910 | Interaction of apoA-II from human high density lipoprotein with lysolecithin. | The effects of lysolecithin and hexadecyltrimethylammonium bromide on the structure and stability of apoA-II from human high density lipoprotein have been evalued by circular dichroism and fluorescence measurements. There is a profound enhancement in the stability of apoA-II to guanidinium hydrochloride denaturation when it forms a phospholipid complex with lysolecithin micelles. This complex is not only resistant to guanidinium hydrochloride denaturation, but it can be formed in a 6 M solution of this denaturant. The behavior of apoA-II in the native human high density protein is much closer to that of the lysolecithin apoA-II complex than to that of the free apoA-II. | Interaction of apoA-II from human high density lipoprotein with lysolecithin. The effects of lysolecithin and hexadecyltrimethylammonium bromide on the structure and stability of apoA-II from human high density lipoprotein have been evalued by circular dichroism and fluorescence measurements. There is a profound enhancement in the stability of apoA-II to guanidinium hydrochloride denaturation when it forms a phospholipid complex with lysolecithin micelles. This complex is not only resistant to guanidinium hydrochloride denaturation, but it can be formed in a 6 M solution of this denaturant. The behavior of apoA-II in the native human high density protein is much closer to that of the lysolecithin apoA-II complex than to that of the free apoA-II. | [
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|
PMID:16912 | Liver microsomal epoxide hydrase. | 1. The substrate specificity of membrane-bound and purified epoxide hydrase from rat liver microsomes has been studied. Both enzyme preparations catalyzed the hydration of a variety of alkene oxidase as well as arene oxides of several polycyclic aromatic hydrocarbons. 2. Unlike the membrane-bound enzyme, the rate of hydration for most of the substrates catalyzed by the purified epoxide hydrase was constant for only 1 or 2 min. The addition of dilauroyl phosphatidylcholine or heated microsomes to the incubation mixture extended the linearity of the reaction. 3. When rat liver microsomes were used as the source of the enzyme, the apparent Km values for many of the substrates were dependent on the amount of microsomes used. When purified epoxide hydrase was used as the enzyme source and benzo(a)pyrene 11,12-oxide as substrate, the apparent Km for benzo(a)pyrene 11,12-oxide was independent of enzyme concentration but dependent on added lipid concentration. Thus, in the absence of added dilauroyl phosphatidylcholine or in the presence of this lipid at a concentration below its critical micelle concentration, the observed Km for benzo(a)pyrene 11,12-oxide remained constant. However, when the lipid concentration was greater than the critical micelle concentration, the apparent Km value increased linearly with lipid concentration. These results are consistent with a model based on the partition of lipid-soluble substrate between the lipid micelle and the aqueous medium. | Liver microsomal epoxide hydrase. 1. The substrate specificity of membrane-bound and purified epoxide hydrase from rat liver microsomes has been studied. Both enzyme preparations catalyzed the hydration of a variety of alkene oxidase as well as arene oxides of several polycyclic aromatic hydrocarbons. 2. Unlike the membrane-bound enzyme, the rate of hydration for most of the substrates catalyzed by the purified epoxide hydrase was constant for only 1 or 2 min. The addition of dilauroyl phosphatidylcholine or heated microsomes to the incubation mixture extended the linearity of the reaction. 3. When rat liver microsomes were used as the source of the enzyme, the apparent Km values for many of the substrates were dependent on the amount of microsomes used. When purified epoxide hydrase was used as the enzyme source and benzo(a)pyrene 11,12-oxide as substrate, the apparent Km for benzo(a)pyrene 11,12-oxide was independent of enzyme concentration but dependent on added lipid concentration. Thus, in the absence of added dilauroyl phosphatidylcholine or in the presence of this lipid at a concentration below its critical micelle concentration, the observed Km for benzo(a)pyrene 11,12-oxide remained constant. However, when the lipid concentration was greater than the critical micelle concentration, the apparent Km value increased linearly with lipid concentration. These results are consistent with a model based on the partition of lipid-soluble substrate between the lipid micelle and the aqueous medium. | [
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|
PMID:16913 | Acidic dissociation constants of folic acid, dihydrofolic acid, and methotrexate. | The acidic dissociation constants in the range HO--1.5 to pH 7 of folic acid, dihydrofolic acid, methopterin (N(10)methylfolic acid), and methotrexate have been measured by potentiometric and spectrophotometric titrations. Assignment of these dissociations was made by comparison to model compounds, by proton magnetic resonance measurements, and by examination of associated ultraviolet absorbance changes. For folic acid, the dissociation constants are as follows: N(1), pK' 2.35; N(10), pK' 0.20; N(5), pK' greater than -1.5. For dihydrofolic acid: N(5), pK' 3.84; N(1), pK' 1.38; N(10), pK' 0.28. For methotrexate: N(1), pK' 5.71; gamma-carboxyl, pK' 4.70; alpha-carboxyl, pK' 3.36; N(10), pK' 0.50; N(5), boxyl, pK' 4.70; alpha-carboxyl, pK' 3.36; N(10), pK' 0.50; N(5) pK' greater than -1.5. For methopterin: acidic ionization of amide, pK' 7.68; gamma-carboxyl, pK' 4.62; N(1), pK' 2.40; N(10), pK; 0.36; N(5), pK' greater than -1.5. The pK' values were determined directly for the four compounds at 25 degrees near 0.1 ionic strength, or in 0.1 to 4 M HCl for pK ln 0.1 M NaCl. | Acidic dissociation constants of folic acid, dihydrofolic acid, and methotrexate. The acidic dissociation constants in the range HO--1.5 to pH 7 of folic acid, dihydrofolic acid, methopterin (N(10)methylfolic acid), and methotrexate have been measured by potentiometric and spectrophotometric titrations. Assignment of these dissociations was made by comparison to model compounds, by proton magnetic resonance measurements, and by examination of associated ultraviolet absorbance changes. For folic acid, the dissociation constants are as follows: N(1), pK' 2.35; N(10), pK' 0.20; N(5), pK' greater than -1.5. For dihydrofolic acid: N(5), pK' 3.84; N(1), pK' 1.38; N(10), pK' 0.28. For methotrexate: N(1), pK' 5.71; gamma-carboxyl, pK' 4.70; alpha-carboxyl, pK' 3.36; N(10), pK' 0.50; N(5), boxyl, pK' 4.70; alpha-carboxyl, pK' 3.36; N(10), pK' 0.50; N(5) pK' greater than -1.5. For methopterin: acidic ionization of amide, pK' 7.68; gamma-carboxyl, pK' 4.62; N(1), pK' 2.40; N(10), pK; 0.36; N(5), pK' greater than -1.5. The pK' values were determined directly for the four compounds at 25 degrees near 0.1 ionic strength, or in 0.1 to 4 M HCl for pK ln 0.1 M NaCl. | [
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|
PMID:16914 | Protein modification enzymes associated with the protein-synthesizing complex from rabbit reticulocytes. Protein kinase, phosphoprotein phosphatase, and acetyltransferase. | A number of protein modification activities are present in the protein-synthesizing complex isolated from rabbit reticulocytes. These enzymes are solubilized by sedimentation of the ribosomes through buffered sucrose containing 0.5 M KCl, and have been partially purified from the high salt wash fraction by chromatography on DEAE-cellulose and phosphocellulose. The ribosomal-associated enzymatic activities include cyclic AMP-regulated and cyclic nucloetide-independent protein kinase, phosphoprotein phosphatase, and acetyltransferase activities. These enzymatic activities have been shown to modify specific ribosomal and ribosomal-associated proteins. The cycli c AMP-regulated protein kinase phosphorylate the 40 S ribosomal subunit from rabbit reticulocytes. One of the cyclic nucleotide-independent protein kinase catalyzes the phosphorylation of two different factors involved in the initiation of hemoglobin synthesis. A single phosphoprotein phosphatase activity is shown to remove phosphate from 40 S ribosomal subunits. The major acetyltransferase activity associated with ribosomes acetylates a 60 S ribosomal protein. | Protein modification enzymes associated with the protein-synthesizing complex from rabbit reticulocytes. Protein kinase, phosphoprotein phosphatase, and acetyltransferase. A number of protein modification activities are present in the protein-synthesizing complex isolated from rabbit reticulocytes. These enzymes are solubilized by sedimentation of the ribosomes through buffered sucrose containing 0.5 M KCl, and have been partially purified from the high salt wash fraction by chromatography on DEAE-cellulose and phosphocellulose. The ribosomal-associated enzymatic activities include cyclic AMP-regulated and cyclic nucloetide-independent protein kinase, phosphoprotein phosphatase, and acetyltransferase activities. These enzymatic activities have been shown to modify specific ribosomal and ribosomal-associated proteins. The cycli c AMP-regulated protein kinase phosphorylate the 40 S ribosomal subunit from rabbit reticulocytes. One of the cyclic nucleotide-independent protein kinase catalyzes the phosphorylation of two different factors involved in the initiation of hemoglobin synthesis. A single phosphoprotein phosphatase activity is shown to remove phosphate from 40 S ribosomal subunits. The major acetyltransferase activity associated with ribosomes acetylates a 60 S ribosomal protein. | [
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|
PMID:16917 | Purification and properties of a membrane-associated, folate-binding protein from Lactobacillus casei. | A folate-binding protein has been solubilized from Lactobacillus casei by treatment of membrane preparations with Triton X-100 in the presence of [3H]folate. The protein-folate complex was purified 100-fold and recovered in a 22% yield by adsorption and elution from microgranular silica (Quso G-32), followed by passage through Sephadex G-150. When subjected to sodium dodecyl sulfate/polyacrylamide gel electrophoresis, the purified preparations showed only a single, protein-staining band whose molecular weight was 25,000. Bound folate (34 nmol/mg of protein) corresponded to 0.85 mol/mol of protein. Analyses of the protein revealed relatively few charged or polar amino acids, an unusually high content of hydrophobic residues and methionine, and the absence of cysteine. The purified protein-folate complex was contained within a Triton micelle (molecular weight, 220,000; about 340 mol of detergent per mol of protein). Bound folate was retained when the micelle was exposed at 4 degrees to solutions whose pH values ranged between 3 and 12; at 23 degrees, however, stability was decreased, especially above pH 8. Folate could be released by treatment of the micelle with ethanol or with chaotropic agents such as guanidinium chloride, perchlorate, or thiocyanate. | Purification and properties of a membrane-associated, folate-binding protein from Lactobacillus casei. A folate-binding protein has been solubilized from Lactobacillus casei by treatment of membrane preparations with Triton X-100 in the presence of [3H]folate. The protein-folate complex was purified 100-fold and recovered in a 22% yield by adsorption and elution from microgranular silica (Quso G-32), followed by passage through Sephadex G-150. When subjected to sodium dodecyl sulfate/polyacrylamide gel electrophoresis, the purified preparations showed only a single, protein-staining band whose molecular weight was 25,000. Bound folate (34 nmol/mg of protein) corresponded to 0.85 mol/mol of protein. Analyses of the protein revealed relatively few charged or polar amino acids, an unusually high content of hydrophobic residues and methionine, and the absence of cysteine. The purified protein-folate complex was contained within a Triton micelle (molecular weight, 220,000; about 340 mol of detergent per mol of protein). Bound folate was retained when the micelle was exposed at 4 degrees to solutions whose pH values ranged between 3 and 12; at 23 degrees, however, stability was decreased, especially above pH 8. Folate could be released by treatment of the micelle with ethanol or with chaotropic agents such as guanidinium chloride, perchlorate, or thiocyanate. | [
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|
PMID:16919 | Purification and properties of NADPH-dependent aldehyde reductase from human liver. | An aldehyde reductase (EC 1.1.1.2) from human liver has been purified to homogeneity. The enzyme is NADPH-dependent, prefers aromatic to aliphatic aldehydes as substrates, and is inhibited by barbiturates and hydantoins. The following physicochemical parameters were determined: molecular weight, 36,200; sedimentation coefficient, 2.9 S; Stokes radius, 2.65 nm; isoelectric point, pH 5.3; extinction coefficient at 280 nm, 54,300 M-1 cm-1. Results from polyacrylamide gel electrophoresis with and without sodium dodecyl sulfate, gel filtration, and ultracentrifugation suggest a monomeric structure. On molecule of NADPH binds to the enzyme causing a red shift of the coenzyme absorption maximum from 340 to 352 nm. The amino acid composition has been determined and a partial specific volume of 0.74 was computed from these data. An alpha-helicity of 7 and 18% was estimated from the ellipticities at 208 and 222 nm, respectively. Combination of the most reactive thiol group with p-mercuribenzoate does not cause loss of catalytic activity. Inactivation occurs when more than one thiol group is modified. The presence of NADPH or NADP+ prevents loss of activity by thiol modification. The comparison of structural features of aldehyde reductase with other monomeric and oligomeric dehydrogenases suggest similarities of aldehyde reductase with octopine dehydrogenase. | Purification and properties of NADPH-dependent aldehyde reductase from human liver. An aldehyde reductase (EC 1.1.1.2) from human liver has been purified to homogeneity. The enzyme is NADPH-dependent, prefers aromatic to aliphatic aldehydes as substrates, and is inhibited by barbiturates and hydantoins. The following physicochemical parameters were determined: molecular weight, 36,200; sedimentation coefficient, 2.9 S; Stokes radius, 2.65 nm; isoelectric point, pH 5.3; extinction coefficient at 280 nm, 54,300 M-1 cm-1. Results from polyacrylamide gel electrophoresis with and without sodium dodecyl sulfate, gel filtration, and ultracentrifugation suggest a monomeric structure. On molecule of NADPH binds to the enzyme causing a red shift of the coenzyme absorption maximum from 340 to 352 nm. The amino acid composition has been determined and a partial specific volume of 0.74 was computed from these data. An alpha-helicity of 7 and 18% was estimated from the ellipticities at 208 and 222 nm, respectively. Combination of the most reactive thiol group with p-mercuribenzoate does not cause loss of catalytic activity. Inactivation occurs when more than one thiol group is modified. The presence of NADPH or NADP+ prevents loss of activity by thiol modification. The comparison of structural features of aldehyde reductase with other monomeric and oligomeric dehydrogenases suggest similarities of aldehyde reductase with octopine dehydrogenase. | [
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|
PMID:16920 | Species-specific aggregation factor in sponges. Sialyltransferase associated with aggregation factor. | The sialyltransferase (= glycoprotein-sialic acid transferase) was studied in the sponge Geodia cydonium, a mesozoan organism. The experiments were performed both in intact cellular and in isolated enzyme systems. It is shown, that desialylated cells show a lower aggregation potency than the controls. During aggregation enzymic sialylation of desialylated sponge cells occurs in the presence of an aggregation factor, which is associated with a high molecular weight particle. The sialylation process is temperature-dependent and can be inhibited by N-ethylmaleimide. Sialylation occurs predominantly at a distinct cell surface component, the aggregation receptor. The sialyltransferase was isolated and purified by the following steps: Sepharose 4B, CM-cellulose, Nonidet treatment, and Sephadex G-100. By this procedure the enzyme was purified 680-fold with a 31% yield. The sialyltransferase is originally associated with the high molecular weight particle also carrying the aggregation factor. In the last step the aggregation factor was separated from the sialyltransferase. The enzyme catalyzes the transfer of sialic acid from CMP-sialic acid to the desialylated aggregation receptor. The molecular weight of the sialyltransferase has been determined to be 52,000. Kinetic studies revealed no lag phase and a dependence on enzyme concentration. The purified transferase has a pH optimum of 7.75 and requires 200 mM NaCl for activity. No requirement for Mg2+ or Ca2+ could be observed. The reaction is inhibited by 10 micronM N-ethylmaleimide. | Species-specific aggregation factor in sponges. Sialyltransferase associated with aggregation factor. The sialyltransferase (= glycoprotein-sialic acid transferase) was studied in the sponge Geodia cydonium, a mesozoan organism. The experiments were performed both in intact cellular and in isolated enzyme systems. It is shown, that desialylated cells show a lower aggregation potency than the controls. During aggregation enzymic sialylation of desialylated sponge cells occurs in the presence of an aggregation factor, which is associated with a high molecular weight particle. The sialylation process is temperature-dependent and can be inhibited by N-ethylmaleimide. Sialylation occurs predominantly at a distinct cell surface component, the aggregation receptor. The sialyltransferase was isolated and purified by the following steps: Sepharose 4B, CM-cellulose, Nonidet treatment, and Sephadex G-100. By this procedure the enzyme was purified 680-fold with a 31% yield. The sialyltransferase is originally associated with the high molecular weight particle also carrying the aggregation factor. In the last step the aggregation factor was separated from the sialyltransferase. The enzyme catalyzes the transfer of sialic acid from CMP-sialic acid to the desialylated aggregation receptor. The molecular weight of the sialyltransferase has been determined to be 52,000. Kinetic studies revealed no lag phase and a dependence on enzyme concentration. The purified transferase has a pH optimum of 7.75 and requires 200 mM NaCl for activity. No requirement for Mg2+ or Ca2+ could be observed. The reaction is inhibited by 10 micronM N-ethylmaleimide. | [
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|
PMID:16921 | Compartmentalization of adenosine 3':5'-monophosphate and adenosine 3':5'-monophosphate-dependent protein kinase in heart tissue. | In rabbit heart homogenates about 50% of the cAMP-dependent protein kinase activity was associated with the low speed particulate fraction. In homogenates of rat or beef heart this fraction represented approximately 30% of the activity. The percentage of the enzyme in the particulate fraction was not appreciably affected either by preparing more dilute homogenates or by aging homogenates for up to 2 h before centrifugation. The particulate enzyme was not solubilized at physiological ionic strength or by the presence of exogenous proteins during homogenization. However, the holoenzyme or regulatory subunit could be solubilized either by Triton X-100, high pH, or trypsin treatment. In hearts of all species studied, the particulate-bound protein kinase was mainly or entirely the type II isozyme, suggesting isozyme compartmentalization. In rabbit hearts perfused in the absence of hormones and homogenized in the presence of 0.25 M NaCl, at least 50% of the cAMP in homogenates was associated with the particulate fraction. Omitting NaCl reduced the amount of particulate-bound cAMP. Most of the particulate-bound cAMP was probably associated with the regulatory subunit in this fraction since approximately 70% of the bound nucleotide was solubilized by addition of homogeneous catalytic subunit to the particulate fraction. The amount of cAMP in the particulate fraction (0.16 nmol/g of tissue) was approximately one-half the amount of the regulatory subunit monomer (0.31 nmol/g of tissue) in this fraction. The calculated amount of catalytic subunit in the particulate fraction was 0.18 nmol/g of tissue. Either epinephrine alone or epinephrine plus 1-methyl-3-isobutylxanthine increased the cAMP content of the particulate and supernatant fractions. The cAMP level was increased more in the supernatant fraction, possibly because the cAMP level became saturating for the regulatory subunit in the particulate fraction. The increase in cAMP was associated with translocation of a large percentage of the catalytic subunit activity from the particulate to the supernatant fraction. The distribution of the regulatory subunit of the enzyme was not significantly affected by this treatment. The catalytic subunit translocation could be mimicked by addition of cAMP to homogenates before centrifugation. The data suggest that the regulatory subunit of the protein kinase, at least that of isozyme II, is bound to particulate material, and theactive catalytic subunit is released by formation of the regulatory subunit-cAMP complex when the tissue cAMP concentration is elevated. A model for compartmentalized hormonal control is presented. | Compartmentalization of adenosine 3':5'-monophosphate and adenosine 3':5'-monophosphate-dependent protein kinase in heart tissue. In rabbit heart homogenates about 50% of the cAMP-dependent protein kinase activity was associated with the low speed particulate fraction. In homogenates of rat or beef heart this fraction represented approximately 30% of the activity. The percentage of the enzyme in the particulate fraction was not appreciably affected either by preparing more dilute homogenates or by aging homogenates for up to 2 h before centrifugation. The particulate enzyme was not solubilized at physiological ionic strength or by the presence of exogenous proteins during homogenization. However, the holoenzyme or regulatory subunit could be solubilized either by Triton X-100, high pH, or trypsin treatment. In hearts of all species studied, the particulate-bound protein kinase was mainly or entirely the type II isozyme, suggesting isozyme compartmentalization. In rabbit hearts perfused in the absence of hormones and homogenized in the presence of 0.25 M NaCl, at least 50% of the cAMP in homogenates was associated with the particulate fraction. Omitting NaCl reduced the amount of particulate-bound cAMP. Most of the particulate-bound cAMP was probably associated with the regulatory subunit in this fraction since approximately 70% of the bound nucleotide was solubilized by addition of homogeneous catalytic subunit to the particulate fraction. The amount of cAMP in the particulate fraction (0.16 nmol/g of tissue) was approximately one-half the amount of the regulatory subunit monomer (0.31 nmol/g of tissue) in this fraction. The calculated amount of catalytic subunit in the particulate fraction was 0.18 nmol/g of tissue. Either epinephrine alone or epinephrine plus 1-methyl-3-isobutylxanthine increased the cAMP content of the particulate and supernatant fractions. The cAMP level was increased more in the supernatant fraction, possibly because the cAMP level became saturating for the regulatory subunit in the particulate fraction. The increase in cAMP was associated with translocation of a large percentage of the catalytic subunit activity from the particulate to the supernatant fraction. The distribution of the regulatory subunit of the enzyme was not significantly affected by this treatment. The catalytic subunit translocation could be mimicked by addition of cAMP to homogenates before centrifugation. The data suggest that the regulatory subunit of the protein kinase, at least that of isozyme II, is bound to particulate material, and theactive catalytic subunit is released by formation of the regulatory subunit-cAMP complex when the tissue cAMP concentration is elevated. A model for compartmentalized hormonal control is presented. | [
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|
PMID:16922 | Interaction of glucocorticoid hormones and cyclic nucleotides in induction of tyrosine aminotransferase in cultured hepatoma cells. | Reproducible induction of the enzyme tyrosine aminotransferase by dibutyryl cAMP (Bt2cAMP) in a line of HTC hepatoma cells in suspension culture requires that the cells be preinduced with dexamethasone, a synthetic glucocorticoid which itself induces tyrosine aminotransferase. Concentrations of dexamethasone that do not induce tyrosine aminotransferase fail to support Bt2cAMP induction, removal of the steroid from the medium leads to a loss of the Bt2cAMP effect, and an HTC cell line whose aminotransferase is not steroid-inducible does not respond to the cyclic nucleotide. We show that the further induction of tyrosine aminotransferase by Bt2cAMP in dexamethasone-treated cells is due to an increased rate of enzyme synthesis. The cyclic nucleotide has no effect on aminotransferase synthesis in cells grown in the absence of steroid. Several lines of evidence suggest that dexamethasone acts at a step beyond the activation of protein kinase by cAMP: (a) basal levels of cAMP are not altered by growth of HTC cells in dexamethasone; (b) accumulation of cAMP from the medium is not enhanced; (c) the glucocorticoid does not induce cAMP-dependent protein kinase in HTC cells; and (d) there is no augmentation of cAMP binding to the regulatory protein, nor is there any change in cAMP activation of protein kinase caused by growth in dexamethasone. These results help define a system that should be useful in studying the interaction of cyclic nucleotides and steroid hormones. | Interaction of glucocorticoid hormones and cyclic nucleotides in induction of tyrosine aminotransferase in cultured hepatoma cells. Reproducible induction of the enzyme tyrosine aminotransferase by dibutyryl cAMP (Bt2cAMP) in a line of HTC hepatoma cells in suspension culture requires that the cells be preinduced with dexamethasone, a synthetic glucocorticoid which itself induces tyrosine aminotransferase. Concentrations of dexamethasone that do not induce tyrosine aminotransferase fail to support Bt2cAMP induction, removal of the steroid from the medium leads to a loss of the Bt2cAMP effect, and an HTC cell line whose aminotransferase is not steroid-inducible does not respond to the cyclic nucleotide. We show that the further induction of tyrosine aminotransferase by Bt2cAMP in dexamethasone-treated cells is due to an increased rate of enzyme synthesis. The cyclic nucleotide has no effect on aminotransferase synthesis in cells grown in the absence of steroid. Several lines of evidence suggest that dexamethasone acts at a step beyond the activation of protein kinase by cAMP: (a) basal levels of cAMP are not altered by growth of HTC cells in dexamethasone; (b) accumulation of cAMP from the medium is not enhanced; (c) the glucocorticoid does not induce cAMP-dependent protein kinase in HTC cells; and (d) there is no augmentation of cAMP binding to the regulatory protein, nor is there any change in cAMP activation of protein kinase caused by growth in dexamethasone. These results help define a system that should be useful in studying the interaction of cyclic nucleotides and steroid hormones. | [
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|
PMID:16924 | Effect of hydrostatic pressure on ligand binding to hemoglobin. | Increase in hydrostatic pressure to 1000 atm increased the affinity of human and menhaden (Brevoortia tyrannus) hemoglobins for oxygen. With necessary assumptions about the form of the equilibrium curve, and after correction for changes in pH and volume due to pressure, the increase in affinity is about 2-fold for both hemoglobins. At pH 6.5, Hill's n for menhaden hemoglobin is near 1, and it is believed to remain in the T state, whereas human hemoglobin undergoes a T to R transition. This suggests that the R-T equilibrium is not disturbed by pressure. In direct experiments the binding of a fluorescent effector (8 hydroxy-1,3,6-pyrene (trisulfonic acid) to deoxyhemoglobin was not changed by pressure. The binding of n-butylisocyanide to hemoglobin and to myoglobin is also greater at high pressures, similarly suggesting that the R-T transition is not involved in the pressure effect. | Effect of hydrostatic pressure on ligand binding to hemoglobin. Increase in hydrostatic pressure to 1000 atm increased the affinity of human and menhaden (Brevoortia tyrannus) hemoglobins for oxygen. With necessary assumptions about the form of the equilibrium curve, and after correction for changes in pH and volume due to pressure, the increase in affinity is about 2-fold for both hemoglobins. At pH 6.5, Hill's n for menhaden hemoglobin is near 1, and it is believed to remain in the T state, whereas human hemoglobin undergoes a T to R transition. This suggests that the R-T equilibrium is not disturbed by pressure. In direct experiments the binding of a fluorescent effector (8 hydroxy-1,3,6-pyrene (trisulfonic acid) to deoxyhemoglobin was not changed by pressure. The binding of n-butylisocyanide to hemoglobin and to myoglobin is also greater at high pressures, similarly suggesting that the R-T transition is not involved in the pressure effect. | [
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|
PMID:16925 | Charges of nicotinamide adenine nucleotides and adenylate energy charge as regulatory parameters of the metabolism in Escherichia coli. | Methods for measurements of catabolic reduction charge (defined as NADH/(NADH+NAD+)) and anabolic reduction charge (defined as NADPH/(NADPH + NADP+)) are described using [14C]nicotinamide labeling of Escherichia coli cultures. Together with these parameters the adenylate energy charge (ATP + 1/2ADP)/(ATP + ADP + AMP) was measured using labeling with [2-3H]adenine. These three charges were found under different exponential growth conditions to have values independent of the growth conditions: catabolic reduction charge, 0.05; anabolic reduction charge, 0.45; and adenylate energy charge, 0.9. The charges were examined during interruption of growth primarily affecting catabolism, respiration, or anabolism, leading to changes of the charges. The changes of charges are evaluated as a possible regulation of the metabolic rates utilizing or producing the nucleotides by their respective charges. | Charges of nicotinamide adenine nucleotides and adenylate energy charge as regulatory parameters of the metabolism in Escherichia coli. Methods for measurements of catabolic reduction charge (defined as NADH/(NADH+NAD+)) and anabolic reduction charge (defined as NADPH/(NADPH + NADP+)) are described using [14C]nicotinamide labeling of Escherichia coli cultures. Together with these parameters the adenylate energy charge (ATP + 1/2ADP)/(ATP + ADP + AMP) was measured using labeling with [2-3H]adenine. These three charges were found under different exponential growth conditions to have values independent of the growth conditions: catabolic reduction charge, 0.05; anabolic reduction charge, 0.45; and adenylate energy charge, 0.9. The charges were examined during interruption of growth primarily affecting catabolism, respiration, or anabolism, leading to changes of the charges. The changes of charges are evaluated as a possible regulation of the metabolic rates utilizing or producing the nucleotides by their respective charges. | [
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|
PMID:16933 | Phosphoprotein phosphatase activity associated with the cytoplasmic membrane of Salmonella typhimurium and Escherichia coli. | Membrane-associated phosphoprotein phosphatase activity was demonstrated in extracts of Salmonella typhimurium and Escherichia coli. The active protein could be extracted from the membrane as a large water-soluble complex (Mr greater than 150,000). Maximal activity was observed at pH 6 to 7 in the presence of a divalent cation. The enzyme appears to be distinct from previously described phosphatases. | Phosphoprotein phosphatase activity associated with the cytoplasmic membrane of Salmonella typhimurium and Escherichia coli. Membrane-associated phosphoprotein phosphatase activity was demonstrated in extracts of Salmonella typhimurium and Escherichia coli. The active protein could be extracted from the membrane as a large water-soluble complex (Mr greater than 150,000). Maximal activity was observed at pH 6 to 7 in the presence of a divalent cation. The enzyme appears to be distinct from previously described phosphatases. | [
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|
PMID:16935 | In vitro activation of the in vivo colony-forming units of the mouse yolk sac. | Experiments were performed to investigate the presence of colony-forming units (CFU) in the mouse embryonic yolk sac during the developmental period in which the yolk sac is the sole hemopoietic organ. Injection of yolk sac cell suspensions from normal embryos into syngeneic, lethally irradiated adult recipients evoked a very low number of spleen colonies. However, prior cultivation of yolk sacs in vitro caused a dramatic increase in the spleen colony-forming capacity--as high as 84-fold--following 48 hours in culture. The yolk sac origin of the spleen colonies was confirmed by: (a) Chromosomal marker analysis; (b) dose-response analysis; (c) demonstrating that the above colonies were not of endogenous origin induced by the mere injection of grafted cells. We conclude that the yolk sac contains many precursors of colony-forming cells which though undetectable by immediate grafting apparently become activated in culture by an as yet unknown induction process. | In vitro activation of the in vivo colony-forming units of the mouse yolk sac. Experiments were performed to investigate the presence of colony-forming units (CFU) in the mouse embryonic yolk sac during the developmental period in which the yolk sac is the sole hemopoietic organ. Injection of yolk sac cell suspensions from normal embryos into syngeneic, lethally irradiated adult recipients evoked a very low number of spleen colonies. However, prior cultivation of yolk sacs in vitro caused a dramatic increase in the spleen colony-forming capacity--as high as 84-fold--following 48 hours in culture. The yolk sac origin of the spleen colonies was confirmed by: (a) Chromosomal marker analysis; (b) dose-response analysis; (c) demonstrating that the above colonies were not of endogenous origin induced by the mere injection of grafted cells. We conclude that the yolk sac contains many precursors of colony-forming cells which though undetectable by immediate grafting apparently become activated in culture by an as yet unknown induction process. | [
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|
PMID:16936 | The diverse effects of 5'-bromodeoxyuridine on enzyme activities in cultured H35 hepatoma cells. | Reuber (H35) hepatoma cells were grown in medium containing 10(-5)M bromodeoxyuridine (BrdU), which was incorporated into their DNA. Cell growth rate was unaffected by BrdU for the first two generations, after which it was reduced by about 50%. The effect of BrdU incorporation on the activities of several enzymes with rapid turnover rates was examined to test the hypothesis that the synthesis of such enzymes will be preferentially inhibited by BrdU. Tyrosine amino-transferase (TAT) activity decreased by 70% within two generations whereas thymidine kinase activity remained at control values. PEP carboxykinase activity was unchanged during the first generation in BrdU-containing medium but, during the second, its activity increased by at least 30%. Ornithine decarboxylase levels decreased by about 50% only after two generations in the presence of BrdU. There appeared to be no simple relationship between turnover rates and the effect of BrdU on enzyme activity. Incorporation of BrdU was found to inhibit the induction of both TAT and PEP carboxykinase by dexamethasone and to enhance the inhibition of cell growth by this steroid. These results are discussed with respect to possible mechanisms of gene expression and development in both normal and neoplastic cells. | The diverse effects of 5'-bromodeoxyuridine on enzyme activities in cultured H35 hepatoma cells. Reuber (H35) hepatoma cells were grown in medium containing 10(-5)M bromodeoxyuridine (BrdU), which was incorporated into their DNA. Cell growth rate was unaffected by BrdU for the first two generations, after which it was reduced by about 50%. The effect of BrdU incorporation on the activities of several enzymes with rapid turnover rates was examined to test the hypothesis that the synthesis of such enzymes will be preferentially inhibited by BrdU. Tyrosine amino-transferase (TAT) activity decreased by 70% within two generations whereas thymidine kinase activity remained at control values. PEP carboxykinase activity was unchanged during the first generation in BrdU-containing medium but, during the second, its activity increased by at least 30%. Ornithine decarboxylase levels decreased by about 50% only after two generations in the presence of BrdU. There appeared to be no simple relationship between turnover rates and the effect of BrdU on enzyme activity. Incorporation of BrdU was found to inhibit the induction of both TAT and PEP carboxykinase by dexamethasone and to enhance the inhibition of cell growth by this steroid. These results are discussed with respect to possible mechanisms of gene expression and development in both normal and neoplastic cells. | [
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|
PMID:16937 | The relation of cycling of intracellular pH to mitosis in the acellular slime mould Physarum polycephalum. | The relation between intracellular pH and the mitotic cycle of Physarum polycephalum was studied by two-independent techniques. Both techniques revealed a long term cycling of intracellular pH which has the same period as the mitotic cycle, Qualitative detection of the changes in intracellular pH was made by measuring the changes in fluorescence of 4-methylesculetin which had been absorbed by the plasmodium. Quantitative measurements of intracellular pH were made throughout the mitotic cycle with antimony micro pH electrodes. The cycle of intracellular pH is sinusoidal in appearance. The maximum intracellular pH (pH 6.6) occurred at, or very near to, mitosis, and was approximately 0.6 pH units higher than the minimum pH, which occurred near the middle of the mitotic cycle. | The relation of cycling of intracellular pH to mitosis in the acellular slime mould Physarum polycephalum. The relation between intracellular pH and the mitotic cycle of Physarum polycephalum was studied by two-independent techniques. Both techniques revealed a long term cycling of intracellular pH which has the same period as the mitotic cycle, Qualitative detection of the changes in intracellular pH was made by measuring the changes in fluorescence of 4-methylesculetin which had been absorbed by the plasmodium. Quantitative measurements of intracellular pH were made throughout the mitotic cycle with antimony micro pH electrodes. The cycle of intracellular pH is sinusoidal in appearance. The maximum intracellular pH (pH 6.6) occurred at, or very near to, mitosis, and was approximately 0.6 pH units higher than the minimum pH, which occurred near the middle of the mitotic cycle. | [
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|
PMID:16938 | Evaluation of the Hall electrolytic conductivity detector for the analysis of narcotic alkaloid and phenothiazine drugs extracted from urine. | The electrolytic conductivity detector can be used for the rapid and selective determination of narcotic alkaloid and phenothiazine drugs in the presence of urine coextractants. The high selectivity of the detector enables drug concentrations as low as 0.1 mg/dl to be analyzed without extensive sample cleanup or derivatization. | Evaluation of the Hall electrolytic conductivity detector for the analysis of narcotic alkaloid and phenothiazine drugs extracted from urine. The electrolytic conductivity detector can be used for the rapid and selective determination of narcotic alkaloid and phenothiazine drugs in the presence of urine coextractants. The high selectivity of the detector enables drug concentrations as low as 0.1 mg/dl to be analyzed without extensive sample cleanup or derivatization. | [
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|
PMID:16939 | Studies on the pathogenesis of an immune defect in multiple myeloma. | The reduced capacity of patients with multiple myeloma to respond to antigen challenge is well recognized. Response to antigen involves antigen recognition, cell proliferation, and synthesis and secretion of antibody. This study examines this sequence of events in peripheral blood lymphocytes from untreated and treated patients with myeloma, from individuals with benign monoclonal gammopathy, and from normal healthy donors. Antigen-binding capacity was assessed by testing the ability of lymphocytes to bind radio-labeled pneumococcal polysaccharide, tetanus toxoid, or diptheria toxin. The in vitro proliferative response to these antigens as well as to pokeweed mitogen and streptokinase-streptodornase was evaluated. The secretion of immunoglobulin in response to pneumococcal polysaccharide, tetanus toxoid, and pokeweed mitogen by 2-4 x 10(6) lymphocytes in 7-day cultures was determined. The effects of coculture of myeloma peripheral blood lymphocytes and normal peripheral blood lymphocytes on immunoglobulin production and mixed leukocyte reactions were explored. All myeloma patients had normal numbers (3-8/5,000 cells) of antigen-binding cells. However, most showed a diminished antigen-induced blast transformation as measured by uptake of [(125)I]5-iodo-2'-deoxyuridine in culture. Immunoglobulin production in response to specific antigen in myeloma lymphocytes was 30-80% less than in normal lymphocytes. Immunoglobulin synthesis and mixed leukocyte responses by normal peripheral blood lymphocytes could be suppressed by myeloma lymphocytes. Multiple suppressor populations were present. Thus, the immune defect in myeloma is beyond the antigen recognition step and involves both the proliferation of antigen-sensitive cells and immunoglobulin production. Further suppressive effects are imposed on normal cells, implying defects in immunoregulation in this disease. | Studies on the pathogenesis of an immune defect in multiple myeloma. The reduced capacity of patients with multiple myeloma to respond to antigen challenge is well recognized. Response to antigen involves antigen recognition, cell proliferation, and synthesis and secretion of antibody. This study examines this sequence of events in peripheral blood lymphocytes from untreated and treated patients with myeloma, from individuals with benign monoclonal gammopathy, and from normal healthy donors. Antigen-binding capacity was assessed by testing the ability of lymphocytes to bind radio-labeled pneumococcal polysaccharide, tetanus toxoid, or diptheria toxin. The in vitro proliferative response to these antigens as well as to pokeweed mitogen and streptokinase-streptodornase was evaluated. The secretion of immunoglobulin in response to pneumococcal polysaccharide, tetanus toxoid, and pokeweed mitogen by 2-4 x 10(6) lymphocytes in 7-day cultures was determined. The effects of coculture of myeloma peripheral blood lymphocytes and normal peripheral blood lymphocytes on immunoglobulin production and mixed leukocyte reactions were explored. All myeloma patients had normal numbers (3-8/5,000 cells) of antigen-binding cells. However, most showed a diminished antigen-induced blast transformation as measured by uptake of [(125)I]5-iodo-2'-deoxyuridine in culture. Immunoglobulin production in response to specific antigen in myeloma lymphocytes was 30-80% less than in normal lymphocytes. Immunoglobulin synthesis and mixed leukocyte responses by normal peripheral blood lymphocytes could be suppressed by myeloma lymphocytes. Multiple suppressor populations were present. Thus, the immune defect in myeloma is beyond the antigen recognition step and involves both the proliferation of antigen-sensitive cells and immunoglobulin production. Further suppressive effects are imposed on normal cells, implying defects in immunoregulation in this disease. | [
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|
PMID:16940 | Aminoglycoside antibiotics and renal function: changes in urinary gamma-glutamyltransferase excretion. | The urinary excretion of the renal proximal tubular enzyme, gamma-glutamyltransferase (gamma-GT), has been studied in 41 patients receiving tobramycin, gentamicin or streptomycin for a variety of infections. All patients receiving tobramycin or gentamicin have shown increased excretion of gamma-GT in the urine. Only 46% of those receiving streptomycin have shown an increase in gamma-GT excretion and this is of a lesser degree. A change in creatinine clearance which could only be explained by antibiotic administration was detected in three patients (2 on gentamicin, 1 on streptomycin). The degree of elevation of urinary gamma-GT activity was greater when the initial creatinine clearance was lower, and it is therefore suggested that those patients with pre-existing renal dysfunction should be monitored particularly carefully for signs of nephrotoxicity from these antibiotics. Urinary gamma-GT is a useful enzyme in the investigation of renal drug effects. | Aminoglycoside antibiotics and renal function: changes in urinary gamma-glutamyltransferase excretion. The urinary excretion of the renal proximal tubular enzyme, gamma-glutamyltransferase (gamma-GT), has been studied in 41 patients receiving tobramycin, gentamicin or streptomycin for a variety of infections. All patients receiving tobramycin or gentamicin have shown increased excretion of gamma-GT in the urine. Only 46% of those receiving streptomycin have shown an increase in gamma-GT excretion and this is of a lesser degree. A change in creatinine clearance which could only be explained by antibiotic administration was detected in three patients (2 on gentamicin, 1 on streptomycin). The degree of elevation of urinary gamma-GT activity was greater when the initial creatinine clearance was lower, and it is therefore suggested that those patients with pre-existing renal dysfunction should be monitored particularly carefully for signs of nephrotoxicity from these antibiotics. Urinary gamma-GT is a useful enzyme in the investigation of renal drug effects. | [
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|
PMID:16943 | Effect of beta adrenergic agonist, prostaglandins, and cortisol on lymphocyte levels of cyclic adenosine monophosphate and glycogen: abnormal lymphocytic metabolism in asthma. | Decreased beta adrenergic regulation of cyclic adenosine monophosphate (cAMP) in lymphocytes has been described in asthma. We investigated adrenergic stimulation of glycogenolysis and responses to prostaglandin E1 (PGE1). Lymphocytes from 24 normal and 24 mild asthmatic subjects who had no drugs for at least 2 weeks were separated on Ficoll-hypaque and incubated in medium 199 with Hepes buffer. Beta adrenergic stimulation of cAMP and glycogenolysis was reduced in the asthmatics (p less than 0.05). PGE produced less of a rise in cAMP in asthmatics than in normals, but the difference was not significant (p greater than 0.05) and glycogenolysis was normal. Cortisol added in vitro potentiates the effect of isoproterenol and PGE1--but in the presence of cortisol the response of the asthmatic cells to isoproterenol is still lower than that of normal cells. This observation would support that "beta adrenergic blockade" is the major defect of asthmatic cells. The conclusion is further supported by the observation that the degree of the blockade is associated with a pathologic condition. | Effect of beta adrenergic agonist, prostaglandins, and cortisol on lymphocyte levels of cyclic adenosine monophosphate and glycogen: abnormal lymphocytic metabolism in asthma. Decreased beta adrenergic regulation of cyclic adenosine monophosphate (cAMP) in lymphocytes has been described in asthma. We investigated adrenergic stimulation of glycogenolysis and responses to prostaglandin E1 (PGE1). Lymphocytes from 24 normal and 24 mild asthmatic subjects who had no drugs for at least 2 weeks were separated on Ficoll-hypaque and incubated in medium 199 with Hepes buffer. Beta adrenergic stimulation of cAMP and glycogenolysis was reduced in the asthmatics (p less than 0.05). PGE produced less of a rise in cAMP in asthmatics than in normals, but the difference was not significant (p greater than 0.05) and glycogenolysis was normal. Cortisol added in vitro potentiates the effect of isoproterenol and PGE1--but in the presence of cortisol the response of the asthmatic cells to isoproterenol is still lower than that of normal cells. This observation would support that "beta adrenergic blockade" is the major defect of asthmatic cells. The conclusion is further supported by the observation that the degree of the blockade is associated with a pathologic condition. | [
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|
PMID:16944 | Further studies on the mechanism of human histamine-induced asthma: the effect of an aerosolized H1 receptor antagonist (diphenhydramine). | This study was designed to better define the mechanism of histamine-induced bronchoconstriction in humans by pharmacologic manipulation of the postulated bronchial histamine receptor sites. Histamine challenges were performed on a heterogeneous group of adult asthmatic subjects. The cumulative units of histamine required for induction of a sustained 20% or greater decrease in FEV1 from baseline were determined. The effect of pretreatment with an aerosolized H1 receptor antagonist, diphenhydramine hydrochloride, was then studied. Analysis of the data showed that the administration of an H1 receptor antagonist prior to histamine challenge significantly blocked the bronchial response to histamine (p less than 0.005). This effect was considered to be due to specific competitive antagonism at the H1 receptor site and suggests the presence of H1 receptors in human bronchial mucosa. | Further studies on the mechanism of human histamine-induced asthma: the effect of an aerosolized H1 receptor antagonist (diphenhydramine). This study was designed to better define the mechanism of histamine-induced bronchoconstriction in humans by pharmacologic manipulation of the postulated bronchial histamine receptor sites. Histamine challenges were performed on a heterogeneous group of adult asthmatic subjects. The cumulative units of histamine required for induction of a sustained 20% or greater decrease in FEV1 from baseline were determined. The effect of pretreatment with an aerosolized H1 receptor antagonist, diphenhydramine hydrochloride, was then studied. Analysis of the data showed that the administration of an H1 receptor antagonist prior to histamine challenge significantly blocked the bronchial response to histamine (p less than 0.005). This effect was considered to be due to specific competitive antagonism at the H1 receptor site and suggests the presence of H1 receptors in human bronchial mucosa. | [
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|
PMID:16945 | [Acid-base equilibrium during acute fetal hypoxia. Experimental study]. | The authors studied the effects of acute hypoxia of short duration in eight pregnant ewes that had been anaesthetised. They showed that during the experiment the E.E.G. as well as the pH and pCO and the maternal lactate levels were not changed and that therefore changes that can be found in the fetus are due solely to its own hypoxia and not due to transmission from the mother. In the fetus the trace flattens in about 30 minutes on an average. After this interval a moderate drop in pH occurs at the same time as an increase in lactacidemia and the relationship between lactate and pyruvate. The heart rate is changed in a variable manner: it accelerates if the basal rate is less than 180 beats a minute and slows if it is above 180. Blood pressure rises. Changes in the cardio-vascular system always precede those in the electroencephalograms. | [Acid-base equilibrium during acute fetal hypoxia. Experimental study]. The authors studied the effects of acute hypoxia of short duration in eight pregnant ewes that had been anaesthetised. They showed that during the experiment the E.E.G. as well as the pH and pCO and the maternal lactate levels were not changed and that therefore changes that can be found in the fetus are due solely to its own hypoxia and not due to transmission from the mother. In the fetus the trace flattens in about 30 minutes on an average. After this interval a moderate drop in pH occurs at the same time as an increase in lactacidemia and the relationship between lactate and pyruvate. The heart rate is changed in a variable manner: it accelerates if the basal rate is less than 180 beats a minute and slows if it is above 180. Blood pressure rises. Changes in the cardio-vascular system always precede those in the electroencephalograms. | [
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|
PMID:16972 | Enhancement of murine cytomegalovirus infection during graft-vs.-host reaction. | A mouse model was used for elucidation of the role of a graft-vs-host reaction in promoting cytomegalovirus infection. F1 (DBA/2 X C3H/He) hybrid mice were infected with murine cytomegalovirus. Five weeks later, a graft-vs.-host reaction was produced in the chronically infected animals by the administration of multiple doses of DBA/2 parental splenocytes. Cytomegalovirus was recovered more often from the organs of mice undergoing graft-vs.-host reaction than from those of control animals (P less than 0.001). These results indicate that the graft-vs.-host reaction alone can enhance murine cytomegalovirus infection in a chronically infected host and may help explain the high incidence of cytomegalovirus infection after bone marrow allograft transplantation in man. | Enhancement of murine cytomegalovirus infection during graft-vs.-host reaction. A mouse model was used for elucidation of the role of a graft-vs-host reaction in promoting cytomegalovirus infection. F1 (DBA/2 X C3H/He) hybrid mice were infected with murine cytomegalovirus. Five weeks later, a graft-vs.-host reaction was produced in the chronically infected animals by the administration of multiple doses of DBA/2 parental splenocytes. Cytomegalovirus was recovered more often from the organs of mice undergoing graft-vs.-host reaction than from those of control animals (P less than 0.001). These results indicate that the graft-vs.-host reaction alone can enhance murine cytomegalovirus infection in a chronically infected host and may help explain the high incidence of cytomegalovirus infection after bone marrow allograft transplantation in man. | [
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|
PMID:16976 | Protein binding to monosodium urate monohydrate, calcium pyrophosphate dihydrate, and silicon dioxide crystals. I. Physical characteristics. | The protein adsorptive properties of monosodium urate monohydrate (MSU), silica (Si), and calcium pyrophosphate dihydrate crystals were studied by qualitative and quantitative techniques. Immunoglobulin G (IgG) was adsorbed preferentially by MSU crystals from normal human serum and demonstrated high-affinity binding isotherms when compared with several isolated proteins in solution. The physical characteristics of this reaction suggest principally an ionic mechanism, since adsorption was enhanced by decreasing pH or ionic strength. Weaker physical forces also were suggested by studies showing enhanced adsorption at lower temperatures. The following order of affinity for Si or MSU crystals was found when equal concentrations of proteins were compared: Cohn fraction II greater than lysozyme greater than beta lactoglobulin greater than bovine serum albumin greater than ovalbumin. IgG adsorption to the crystals studied may explain certain features of their biological activity. It is suggested that this phenomenon blocks the membranolytic properties of crystals and stimulates their phagocytosis through interaction with Fc receptors on the surface of the phagocytic cells. | Protein binding to monosodium urate monohydrate, calcium pyrophosphate dihydrate, and silicon dioxide crystals. I. Physical characteristics. The protein adsorptive properties of monosodium urate monohydrate (MSU), silica (Si), and calcium pyrophosphate dihydrate crystals were studied by qualitative and quantitative techniques. Immunoglobulin G (IgG) was adsorbed preferentially by MSU crystals from normal human serum and demonstrated high-affinity binding isotherms when compared with several isolated proteins in solution. The physical characteristics of this reaction suggest principally an ionic mechanism, since adsorption was enhanced by decreasing pH or ionic strength. Weaker physical forces also were suggested by studies showing enhanced adsorption at lower temperatures. The following order of affinity for Si or MSU crystals was found when equal concentrations of proteins were compared: Cohn fraction II greater than lysozyme greater than beta lactoglobulin greater than bovine serum albumin greater than ovalbumin. IgG adsorption to the crystals studied may explain certain features of their biological activity. It is suggested that this phenomenon blocks the membranolytic properties of crystals and stimulates their phagocytosis through interaction with Fc receptors on the surface of the phagocytic cells. | [
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|
PMID:16977 | Effect of CO2 concentration on phosphatidylcholine and phosphatidylglycerol metabolism in surfactant and residual lung fractions. | An investigation of the effect of change of total CO(2) concentration from 7 to 43 mM at pH 7.35 in the medium perfusing isolated rat lungs on [U-(14)C]glucose incorporation into lung phospholipids has been carried out. The incorporation of [U-(14)C]glucose into phosphatidylcholine and phosphatidylglycerol of the surfactant fraction and of the remaining lung tissue (residual fraction) was observed. Increased CO(2) concentration increased [U-(14)C]glucose incorporation into phosphatidylcholine of the surfactant fraction and residual fraction by 43 and 50%, respectively, during a 2 hr perfusion. Likewise, incorporation of [U-(14)C]glucose into phosphatidylglycerol was increased 22 and 34% into the surfactant and residual fractions, respectively. The percentage of [U-(14)C]glucose incorporated into the fatty acid moieties of phosphatidylcholine of both fractions increased as a result of increased CO(2) concentration. The increase in the incorporation of [U-(14)C]glucose into the fatty acid moieties of phosphatidylcholine was confirmed by an average increase of 56 and 77% in the specific activity of palmitic acid isolated from phosphatidylcholine of the surfactant and residual fraction, respectively, as a result of increased CO(2) concentration. The results suggest that alteration in extracellular CO(2) concentration affects the de novo synthesis from glucose of phosphatidylcholine and phosphatidylglycerol of the surfactant-lipoprotein fraction of lung. | Effect of CO2 concentration on phosphatidylcholine and phosphatidylglycerol metabolism in surfactant and residual lung fractions. An investigation of the effect of change of total CO(2) concentration from 7 to 43 mM at pH 7.35 in the medium perfusing isolated rat lungs on [U-(14)C]glucose incorporation into lung phospholipids has been carried out. The incorporation of [U-(14)C]glucose into phosphatidylcholine and phosphatidylglycerol of the surfactant fraction and of the remaining lung tissue (residual fraction) was observed. Increased CO(2) concentration increased [U-(14)C]glucose incorporation into phosphatidylcholine of the surfactant fraction and residual fraction by 43 and 50%, respectively, during a 2 hr perfusion. Likewise, incorporation of [U-(14)C]glucose into phosphatidylglycerol was increased 22 and 34% into the surfactant and residual fractions, respectively. The percentage of [U-(14)C]glucose incorporated into the fatty acid moieties of phosphatidylcholine of both fractions increased as a result of increased CO(2) concentration. The increase in the incorporation of [U-(14)C]glucose into the fatty acid moieties of phosphatidylcholine was confirmed by an average increase of 56 and 77% in the specific activity of palmitic acid isolated from phosphatidylcholine of the surfactant and residual fraction, respectively, as a result of increased CO(2) concentration. The results suggest that alteration in extracellular CO(2) concentration affects the de novo synthesis from glucose of phosphatidylcholine and phosphatidylglycerol of the surfactant-lipoprotein fraction of lung. | [
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PMID:16978 | The significance of lipoprotein lipase in rat skeletal muscles. | Lipoprotein lipase was assayed in extracts of acetone-ether powders of rat skeletal muscles. Enzyme activity in soleus had typical characteristics of lipoprotein lipase in other tissues: inhibition by molar NaCl and protamine sulfate and activation by the human apolipoprotein, R-glutamic acid. Activity in muscles with predominantly red fibers (soleus, diaphragm, lateral head of gastrocnemius and anterior band of semitendinosus) was higher than in those with predominantly white fibers (body of gastrocnemius and posterior band of semitendinosus). No effect of a 24 hour fast upon enzyme activity was observed in ten skeletal muscles, but activity decreased substantially in four adipose tissue depots and increased slightly in heart muscle with fasting. Four minutes after intravenous injection of labeled lymph chylomicrons, skeletal muscles with predominantly red fibers incorporated several times more chylomicron triglyceride fatty acids than thos with predominantly white fibers. Estimated lipoprotein lipase activity in total skeletal muscle was about two-thirds that in total adipose tissue of rats fed ad libitum. After a 24 hour fast, total activity in skeletal muscle was about twice that in adipose tissue. These data suggest that a substantial fraction of lipoprotein lipase is in skeletal muscle of rats and that this tissue, especially its red fibers, is an important site of removal of triglycerides from the blood. | The significance of lipoprotein lipase in rat skeletal muscles. Lipoprotein lipase was assayed in extracts of acetone-ether powders of rat skeletal muscles. Enzyme activity in soleus had typical characteristics of lipoprotein lipase in other tissues: inhibition by molar NaCl and protamine sulfate and activation by the human apolipoprotein, R-glutamic acid. Activity in muscles with predominantly red fibers (soleus, diaphragm, lateral head of gastrocnemius and anterior band of semitendinosus) was higher than in those with predominantly white fibers (body of gastrocnemius and posterior band of semitendinosus). No effect of a 24 hour fast upon enzyme activity was observed in ten skeletal muscles, but activity decreased substantially in four adipose tissue depots and increased slightly in heart muscle with fasting. Four minutes after intravenous injection of labeled lymph chylomicrons, skeletal muscles with predominantly red fibers incorporated several times more chylomicron triglyceride fatty acids than thos with predominantly white fibers. Estimated lipoprotein lipase activity in total skeletal muscle was about two-thirds that in total adipose tissue of rats fed ad libitum. After a 24 hour fast, total activity in skeletal muscle was about twice that in adipose tissue. These data suggest that a substantial fraction of lipoprotein lipase is in skeletal muscle of rats and that this tissue, especially its red fibers, is an important site of removal of triglycerides from the blood. | [
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|
PMID:16979 | Endocrine regulation of sex-dependent hydroxysteroid dehydrogenase activities in rat kidney: NADP-dependent microsomal 3alpha- and 20beta-hydroxysteroid dehydrogenase. | The NADP-dependent microsomal kidney enzymes, 3alpha- and 20beta-hydroxysteroid dehydrogenase (HSDH), which exhibit considerable sex differences in their activities (male:female activity ratios, 16:1 and 30:1 respectively), were investigated after interference with the pituitary-gonad and pituitary-adrenal systems. Prepubertal gonadectomy as well as hypophysectomy of mature male rats led to a decline in HSDH activity to almost that found in the normal female rat, whereas activities in female rats were unaffected. Testosterone induced typical male 3alpha-HSDH activity in both gonadectomized and hypophysectomized rats of either sex. Administration of 5alpha-dihydrotestosterone (5alpha-DHT) or 5alpha-androstane-3alpha, 17beta-diol to hypophysectomized male rats was equally effective in restoring full 3alpha- and 20beta-HSDH activities whereas 5alpha-androstane-3beta, 17beta-diol was less effective and dehydroepiandrosterone was ineffective. Simultaneous administration of cyproterone acetate did not block the inductive action of 5alpha-DHT. Administration of chorionic gonadotrophin, pregnant mare serum gonadotrophin or a combination of luteinizing hormone and follicle-stimulating hormone to hypophysectomized male rats all led to parallel increases in the weight of the seminal vesicles and in both renal enzyme activities; administration of growth hormone, prolactin or thyroid-stimulating hormone was ineffective. Adrenalectomy of gonadectomized, but not of hypophysectomized male rats, caused a further drop in activity to the normal female level. Adrenalectomy of otherwise intact rats did not affect either enzyme activity. The hypophysis was involved in the regulation of the two NADP-dependent renal HSDH activities through its gonadotrophic function in male rats; adrenal secretions were of little physiological significance. | Endocrine regulation of sex-dependent hydroxysteroid dehydrogenase activities in rat kidney: NADP-dependent microsomal 3alpha- and 20beta-hydroxysteroid dehydrogenase. The NADP-dependent microsomal kidney enzymes, 3alpha- and 20beta-hydroxysteroid dehydrogenase (HSDH), which exhibit considerable sex differences in their activities (male:female activity ratios, 16:1 and 30:1 respectively), were investigated after interference with the pituitary-gonad and pituitary-adrenal systems. Prepubertal gonadectomy as well as hypophysectomy of mature male rats led to a decline in HSDH activity to almost that found in the normal female rat, whereas activities in female rats were unaffected. Testosterone induced typical male 3alpha-HSDH activity in both gonadectomized and hypophysectomized rats of either sex. Administration of 5alpha-dihydrotestosterone (5alpha-DHT) or 5alpha-androstane-3alpha, 17beta-diol to hypophysectomized male rats was equally effective in restoring full 3alpha- and 20beta-HSDH activities whereas 5alpha-androstane-3beta, 17beta-diol was less effective and dehydroepiandrosterone was ineffective. Simultaneous administration of cyproterone acetate did not block the inductive action of 5alpha-DHT. Administration of chorionic gonadotrophin, pregnant mare serum gonadotrophin or a combination of luteinizing hormone and follicle-stimulating hormone to hypophysectomized male rats all led to parallel increases in the weight of the seminal vesicles and in both renal enzyme activities; administration of growth hormone, prolactin or thyroid-stimulating hormone was ineffective. Adrenalectomy of gonadectomized, but not of hypophysectomized male rats, caused a further drop in activity to the normal female level. Adrenalectomy of otherwise intact rats did not affect either enzyme activity. The hypophysis was involved in the regulation of the two NADP-dependent renal HSDH activities through its gonadotrophic function in male rats; adrenal secretions were of little physiological significance. | [
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|
PMID:16980 | [A comparision of different methods and reagents for the determination of gamma-glutamyl transferase in serum (author's transl)]. | Four commercially available kinetic photometric tests for the determination of gamma-glutamyl transferase were compared. Test A is based on the substrate L-gamma-glutamyl-4-nitroanilide; test B uses this same substrate dissolved in hydrochloric acid. C1 and C2 are tests from different suppliers; both use the substrate L-gamma-glutamyl-3-carboxy-4-nitroanilide, and all other constituents are the same as quoted by the suppliers. Parallel determinations were performed on 1017 native sera and 12 control sera. Compared with values from test A, two of the three other tests showed statistically significant differences in the diagnostically important range 10 to 50 U/l. Significant differences were also observed between the results from the apparently identical tests, C1, and C2. The values obtained for control sera showed a dependence on the test procedure and/or composition. | [A comparision of different methods and reagents for the determination of gamma-glutamyl transferase in serum (author's transl)]. Four commercially available kinetic photometric tests for the determination of gamma-glutamyl transferase were compared. Test A is based on the substrate L-gamma-glutamyl-4-nitroanilide; test B uses this same substrate dissolved in hydrochloric acid. C1 and C2 are tests from different suppliers; both use the substrate L-gamma-glutamyl-3-carboxy-4-nitroanilide, and all other constituents are the same as quoted by the suppliers. Parallel determinations were performed on 1017 native sera and 12 control sera. Compared with values from test A, two of the three other tests showed statistically significant differences in the diagnostically important range 10 to 50 U/l. Significant differences were also observed between the results from the apparently identical tests, C1, and C2. The values obtained for control sera showed a dependence on the test procedure and/or composition. | [
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|
PMID:16982 | Exchange diffusion of dopamine induced in planar lipid bilayer membranes by the ionophore X537A. | The ionophore X537A causes a large increase in the [(14)C]dopamine (a catecholamine) permeability of planar bilayer membranes. Dopamine transport increases linearly with the ionophore concentration. At relatively high concentrations in the presence of dopamine, the ionophore omdices a conductance which is nearly ideally selective for the dopamine cation. However, the total dopamine flux as determined in tracer experiments is not affected by an electric field and is over 10(5) times larger than predicted from the estimated dopamine conductance. Increasing the dopamine concentration on the side containing radioactive dopamine (the cis side) saturates the dopamine transport. This saturation is relieved by trans addition of nonradioactive dopamine, tyramine, H(+), or K(+). With unequal concentrations of dopamine cis and trans (49 and 12.5 mM), the unidirectional dopamine fluxes are equal. Increasing H(+) cis and trans decreases dopamine transport. It is concluded that at physiological pH, the X537A-induced transport of dopamine occurs via an electrically silent exchange diffusion of dopamine cation with another cation (e.g., dopamine(+), H(+), or K(+)). X537A induces a Ca(++)-independent release of catecholamines from sympathetic nerves by interfering with intracellular storage within storage vesicles (R.W. Holz. 1975. Biochim. Biophys. Acta. 375:138-152). It is suggested that X537A causes an exchange of intravesicular catecholamine with a cytoplasmic cation (perhaps K(+) or H(+)) across the storage vesicle membrane. | Exchange diffusion of dopamine induced in planar lipid bilayer membranes by the ionophore X537A. The ionophore X537A causes a large increase in the [(14)C]dopamine (a catecholamine) permeability of planar bilayer membranes. Dopamine transport increases linearly with the ionophore concentration. At relatively high concentrations in the presence of dopamine, the ionophore omdices a conductance which is nearly ideally selective for the dopamine cation. However, the total dopamine flux as determined in tracer experiments is not affected by an electric field and is over 10(5) times larger than predicted from the estimated dopamine conductance. Increasing the dopamine concentration on the side containing radioactive dopamine (the cis side) saturates the dopamine transport. This saturation is relieved by trans addition of nonradioactive dopamine, tyramine, H(+), or K(+). With unequal concentrations of dopamine cis and trans (49 and 12.5 mM), the unidirectional dopamine fluxes are equal. Increasing H(+) cis and trans decreases dopamine transport. It is concluded that at physiological pH, the X537A-induced transport of dopamine occurs via an electrically silent exchange diffusion of dopamine cation with another cation (e.g., dopamine(+), H(+), or K(+)). X537A induces a Ca(++)-independent release of catecholamines from sympathetic nerves by interfering with intracellular storage within storage vesicles (R.W. Holz. 1975. Biochim. Biophys. Acta. 375:138-152). It is suggested that X537A causes an exchange of intravesicular catecholamine with a cytoplasmic cation (perhaps K(+) or H(+)) across the storage vesicle membrane. | [
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|
PMID:16983 | The rumen flagellate Piromonas communis: its life-history and invasion of plant material in the rumen. | The rumen flagellat Piromonas communis is the zoospore of a phycomycete fungus inhabiting the rumen. Zoosporogenesis was stimulated by a dietary component (the inducer), and inhibited by compounds affecting membrane structure and function, but not by inhibitors of protein synthesis. The zoospores showed taxis towards the tissues surrounding the inflorescence of Lolium perenne L. in the rumen, invading principally the stomata and damaged tissues. The zoospores germinated on this substratum and the rhizoids of the developing vegetative stage penetrated the tissue, taking up C14 from labelled plant material, which was incorporated into the fungal cells. The conditions for maximum flagellate production (39 degrees C, pH 6-0 to 7-0, high concentration of CO2, absence of O2) resembled those found in the rumen. The organism was cultured in an undefined medium in vitro in the absence of other flagellates. | The rumen flagellate Piromonas communis: its life-history and invasion of plant material in the rumen. The rumen flagellat Piromonas communis is the zoospore of a phycomycete fungus inhabiting the rumen. Zoosporogenesis was stimulated by a dietary component (the inducer), and inhibited by compounds affecting membrane structure and function, but not by inhibitors of protein synthesis. The zoospores showed taxis towards the tissues surrounding the inflorescence of Lolium perenne L. in the rumen, invading principally the stomata and damaged tissues. The zoospores germinated on this substratum and the rhizoids of the developing vegetative stage penetrated the tissue, taking up C14 from labelled plant material, which was incorporated into the fungal cells. The conditions for maximum flagellate production (39 degrees C, pH 6-0 to 7-0, high concentration of CO2, absence of O2) resembled those found in the rumen. The organism was cultured in an undefined medium in vitro in the absence of other flagellates. | [
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|
PMID:16991 | The effects of beta adrenergic blockade on spinal cord autoregulation in the monkey. | Blood flow in the spinal cord was measured in a group of monkeys over a wide range of artificially varied blood pressures after the administration of propranolol, a beta adrenergic blocker. Spinal cord blood flow was found to be constant and in the normal range between a mean system arterial blood pressure of 50 to 150 mm Hg. From 150 to 180 mm Hg spinal cord blood flow decreased. There was no breakthrough of autoregulation, previously seen in the untreated animal. It is suggested, therefore, that the previously observed breakthrough of autoregulation is a beta adrenergic-mediated phenomenon. | The effects of beta adrenergic blockade on spinal cord autoregulation in the monkey. Blood flow in the spinal cord was measured in a group of monkeys over a wide range of artificially varied blood pressures after the administration of propranolol, a beta adrenergic blocker. Spinal cord blood flow was found to be constant and in the normal range between a mean system arterial blood pressure of 50 to 150 mm Hg. From 150 to 180 mm Hg spinal cord blood flow decreased. There was no breakthrough of autoregulation, previously seen in the untreated animal. It is suggested, therefore, that the previously observed breakthrough of autoregulation is a beta adrenergic-mediated phenomenon. | [
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|
PMID:16993 | In vivo effects of glucagon on fatty acid synthesis in fasted and refed rats. | Since altered nutritional states evoke compensatory changes in systemic levels of several hormones, the present study was conducted to determine in vivo effects of glucagon and insulin on hepatic and adipose tissue lipogenesis in fed, fasted (3-days) and refed (3-days) rats. Compared to the fed controls, glucagon reduced hepatic fatty acid synthesis and acetyl CoA carboxylase activity by 62% and 65% in fed rats, and by 51% and 48%, respectively, in refed rats. In contrast, glucagon had no effect on fatty acid synthesis or acetyl CoA carboxylase activity in adipose tissue of any of the three experimental groups. Exogenous insulin antagonized the glucagon effects and restored hepatic fatty acid synthesis and enzyme activity in fed or refed rats. No glucagon or insulin effects were observed in fasting rats. In addition, glucagon reduced in vivo incorporation of acetate into hepatic cholesterol by about 33% and into fatty acids of the liver, and heart and the kidney by 33%, 77% and 30%, respectively. The hormone had no effect on fatty acid synthesis in the muscle. | In vivo effects of glucagon on fatty acid synthesis in fasted and refed rats. Since altered nutritional states evoke compensatory changes in systemic levels of several hormones, the present study was conducted to determine in vivo effects of glucagon and insulin on hepatic and adipose tissue lipogenesis in fed, fasted (3-days) and refed (3-days) rats. Compared to the fed controls, glucagon reduced hepatic fatty acid synthesis and acetyl CoA carboxylase activity by 62% and 65% in fed rats, and by 51% and 48%, respectively, in refed rats. In contrast, glucagon had no effect on fatty acid synthesis or acetyl CoA carboxylase activity in adipose tissue of any of the three experimental groups. Exogenous insulin antagonized the glucagon effects and restored hepatic fatty acid synthesis and enzyme activity in fed or refed rats. No glucagon or insulin effects were observed in fasting rats. In addition, glucagon reduced in vivo incorporation of acetate into hepatic cholesterol by about 33% and into fatty acids of the liver, and heart and the kidney by 33%, 77% and 30%, respectively. The hormone had no effect on fatty acid synthesis in the muscle. | [
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|
PMID:16995 | Effects of putative neurotransmitters on the motor activity of Spirometra mansonoides. | 5-Hydroxytryptamine (5-HT), epinephrine, and dopamine strongly stimulated the motor activity of larval Spirometra mansonoides. By contrast, a cholinomimetic agent, arecoline, paralyzed the worms. There was some pharmacological specificity among the agonists but not with various antagonists. Acetylcholinesterase activity was present in both larval and adult Spirometra. | Effects of putative neurotransmitters on the motor activity of Spirometra mansonoides. 5-Hydroxytryptamine (5-HT), epinephrine, and dopamine strongly stimulated the motor activity of larval Spirometra mansonoides. By contrast, a cholinomimetic agent, arecoline, paralyzed the worms. There was some pharmacological specificity among the agonists but not with various antagonists. Acetylcholinesterase activity was present in both larval and adult Spirometra. | [
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|
PMID:16997 | Actions of iontophoretic phenytoin and medazepam on hippocampal neurons. | In rats anesthetized with methoxyflurane, phenytoin (DPH) and medazepam (MDZ) were administered iontophoretically to pyramidal and granule cells discharging spontaneously or being driven by acetylcholine or glutamic acid. The objectives were to determine if: 1) these anticonvulsant agents exert direct effects on the rates of discharge of hippocampal neurons; 2) similarities exist between responses elicited by DPH and MDZ; and 3) pyramidal and granule cells differ in their responsiveness to the drugs. The firing rates of 38% of spontaneously active neurons were reduced by iontophoretic DPH. The incidence of depression by DPH depended upon the pretest discharge rates of the cells. Only 5% of cells with spontaneous rates less than 12/sec were depressed by DPH, but 80% with rates faster than 12/sec were inhibited. MDZ depressed 79% of spontaneously firing neurons regardless of pretest discharge rate. A majority of neurons whose firing rates were facilitated by either acetylcholine or glutamate were depressed by DPH or MDZ ejected iontophoretically. Pyramidal and granule cells responded similarly to putative transmitters, but differentially to the drugs. MDZ depressed a much greater proportion of spontaneously active granule cells then DPH. Phenytoin and MDZ differed with regard to the incidence of depression of spontaneous discharges, inhibition of slow firing cells, the proportion of granule cells depressed, and the duration of effect. These differences may be due to potency and pharmacokinetic factors or dissimilar mechanisms of action when the compounds are applied directly to single neurons. | Actions of iontophoretic phenytoin and medazepam on hippocampal neurons. In rats anesthetized with methoxyflurane, phenytoin (DPH) and medazepam (MDZ) were administered iontophoretically to pyramidal and granule cells discharging spontaneously or being driven by acetylcholine or glutamic acid. The objectives were to determine if: 1) these anticonvulsant agents exert direct effects on the rates of discharge of hippocampal neurons; 2) similarities exist between responses elicited by DPH and MDZ; and 3) pyramidal and granule cells differ in their responsiveness to the drugs. The firing rates of 38% of spontaneously active neurons were reduced by iontophoretic DPH. The incidence of depression by DPH depended upon the pretest discharge rates of the cells. Only 5% of cells with spontaneous rates less than 12/sec were depressed by DPH, but 80% with rates faster than 12/sec were inhibited. MDZ depressed 79% of spontaneously firing neurons regardless of pretest discharge rate. A majority of neurons whose firing rates were facilitated by either acetylcholine or glutamate were depressed by DPH or MDZ ejected iontophoretically. Pyramidal and granule cells responded similarly to putative transmitters, but differentially to the drugs. MDZ depressed a much greater proportion of spontaneously active granule cells then DPH. Phenytoin and MDZ differed with regard to the incidence of depression of spontaneous discharges, inhibition of slow firing cells, the proportion of granule cells depressed, and the duration of effect. These differences may be due to potency and pharmacokinetic factors or dissimilar mechanisms of action when the compounds are applied directly to single neurons. | [
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|
PMID:16998 | Unusual alpha adrenergic receptor potency of methyldopa metabolites on melanocyte function. | Catecholamines possessing alpha adrenergic receptor agonist properties induce lightening or reverse melanocyte stimulating hormone darkening of frog skin in vitro. The capacity to activate this alpha receptor by the methyldopa metabolites methyldopamine and methylnorepinephrine was compared with the capacity of the naturally occurring dopa metabolites, dopamine and norepinephrine. Melanocyte stimulating hormone-induced darkening or dispersion of the granules was reversed by each of these metabolites. Methylnorepinephrine was 10 times as potent as norepinephrine, and methyldopamine was 30- to 100-fold more potent than the naturally occurring dopamine. These inhibitory effects on melanocyte stimulating hormone could be blocked or partially impaired using the alpha adrenergic blocker, phentolamine. They were not affected by pretreatment of frogs with the monoamine oxidase inhibitor pheniprazine (Catron) nor by the application of pheniprazine, angiotensin or serotonin in vitro. This neuroendocrine model has alpha adrenergic receptor relationships analogous to those described in the central nervous system for methyldopa metabolites. | Unusual alpha adrenergic receptor potency of methyldopa metabolites on melanocyte function. Catecholamines possessing alpha adrenergic receptor agonist properties induce lightening or reverse melanocyte stimulating hormone darkening of frog skin in vitro. The capacity to activate this alpha receptor by the methyldopa metabolites methyldopamine and methylnorepinephrine was compared with the capacity of the naturally occurring dopa metabolites, dopamine and norepinephrine. Melanocyte stimulating hormone-induced darkening or dispersion of the granules was reversed by each of these metabolites. Methylnorepinephrine was 10 times as potent as norepinephrine, and methyldopamine was 30- to 100-fold more potent than the naturally occurring dopamine. These inhibitory effects on melanocyte stimulating hormone could be blocked or partially impaired using the alpha adrenergic blocker, phentolamine. They were not affected by pretreatment of frogs with the monoamine oxidase inhibitor pheniprazine (Catron) nor by the application of pheniprazine, angiotensin or serotonin in vitro. This neuroendocrine model has alpha adrenergic receptor relationships analogous to those described in the central nervous system for methyldopa metabolites. | [
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|
PMID:17000 | Alpha blocking action of the antihypertensive agent, prazosin. | The vasodilatory and alpha adrenergic blocking properties of prazosin were studied in anesthetized rats and compared with the direct-acting vasodilator, diazoside. The hypotensive activity of diazoxide was unimpaired after ganglion blockade with pentolinium or alpha adrenoreceptor blockade with phentolamine; diazoxide also significantly attenuated angiotensin II pressor responses. In contrast, the hypotensive action of prazosin was completely abolished, over a 10(4)-fold dose range, after ganglion or alpha adrenoreceptor blockade, and this agent failed, even in maximal hypotensive doses, to attenuate angiotensin II pressor responses. In addition, prazosin was shown to possess potent alpha adrenoreceptor blocking properties, significantly attenuating norepinephrine pressor responses and causing reversal of epinephrine pressor responses. These studies in the rat indicate that the hypotensive action of prazosin is not due to a direct relaxant effect upon vascular smooth muscle, but is attributable to alpha adrenoreceptor blockade. | Alpha blocking action of the antihypertensive agent, prazosin. The vasodilatory and alpha adrenergic blocking properties of prazosin were studied in anesthetized rats and compared with the direct-acting vasodilator, diazoside. The hypotensive activity of diazoxide was unimpaired after ganglion blockade with pentolinium or alpha adrenoreceptor blockade with phentolamine; diazoxide also significantly attenuated angiotensin II pressor responses. In contrast, the hypotensive action of prazosin was completely abolished, over a 10(4)-fold dose range, after ganglion or alpha adrenoreceptor blockade, and this agent failed, even in maximal hypotensive doses, to attenuate angiotensin II pressor responses. In addition, prazosin was shown to possess potent alpha adrenoreceptor blocking properties, significantly attenuating norepinephrine pressor responses and causing reversal of epinephrine pressor responses. These studies in the rat indicate that the hypotensive action of prazosin is not due to a direct relaxant effect upon vascular smooth muscle, but is attributable to alpha adrenoreceptor blockade. | [
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|
PMID:17001 | Measurement of prostaglandin E2 in an inflammatory exudate: effects of nonsteroidal anti-inflammatory agents. | A method was developed for extracting and measuring nanogram quantities of prostaglandin E2 (PGE2) from carrageenan-induced abscess in the rat. PGE2 concentration, quantitated by radioimmunoassay, was 42.5 and 92.9 ng/g of abscess in two studies. Anti-inflammatory activity, based on reduction in abscess weight, was observed with indomethacin, phenylbutazone, SC-19220 and A-22981; however, only indomethacin (10 mg/kg i.p.) significantly reduced PGE2 levels in the abscess tissue. Dose-related anti-inflammatory activity of indomethacin (1-10 mg/kg i.p.) was directly correlated with reductions of PGE2 content in the abscess. These data support the theory that the anti-inflammatory activity of indomethacin in the carrageenan abscess model involves inhibition of prostaglandin formation. Dose-related suppression of abscess formation by SC-19220 (7.5-30 mg/kg i.p.) was not related to changes in PGE2 levels at the inflammatory site, which suggests that the anti-inflammatory mechanism of SC-19220 is not mediated via inhibition of prostaglandin synthesis. | Measurement of prostaglandin E2 in an inflammatory exudate: effects of nonsteroidal anti-inflammatory agents. A method was developed for extracting and measuring nanogram quantities of prostaglandin E2 (PGE2) from carrageenan-induced abscess in the rat. PGE2 concentration, quantitated by radioimmunoassay, was 42.5 and 92.9 ng/g of abscess in two studies. Anti-inflammatory activity, based on reduction in abscess weight, was observed with indomethacin, phenylbutazone, SC-19220 and A-22981; however, only indomethacin (10 mg/kg i.p.) significantly reduced PGE2 levels in the abscess tissue. Dose-related anti-inflammatory activity of indomethacin (1-10 mg/kg i.p.) was directly correlated with reductions of PGE2 content in the abscess. These data support the theory that the anti-inflammatory activity of indomethacin in the carrageenan abscess model involves inhibition of prostaglandin formation. Dose-related suppression of abscess formation by SC-19220 (7.5-30 mg/kg i.p.) was not related to changes in PGE2 levels at the inflammatory site, which suggests that the anti-inflammatory mechanism of SC-19220 is not mediated via inhibition of prostaglandin synthesis. | [
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|
PMID:17002 | The concentration of ionized magnesium in barnacle muscle fibres. | 1. The total Mg in isolated fibres of Balanus aquila was 10-5 m-mole/kg wet wt. 2. The intracellular free Mg was measured by a null point method using Eriochrome Blue as an indicator of free Mg, and internal dialysis with solutions of varying ionized Mg concentrations. The results indicated a free Mg of 6 mM or 4-2 m-mole/kg wet wt. in the intracellular water immediately surrounding the dialysis capillary. 3. The ATP concentration was estimated to be 4-9 m-mole/kg wet wt. 4. A tentative partitioning of Mg among various intracellular constitutents based on present data combined with published work by others is (m-mole/kg wet wt): free, 4-2; MgATP, 4-2; myofibrillar bound, 1; residual (presumably bound to arginine phosphate and phosphate) ca. 1. | The concentration of ionized magnesium in barnacle muscle fibres. 1. The total Mg in isolated fibres of Balanus aquila was 10-5 m-mole/kg wet wt. 2. The intracellular free Mg was measured by a null point method using Eriochrome Blue as an indicator of free Mg, and internal dialysis with solutions of varying ionized Mg concentrations. The results indicated a free Mg of 6 mM or 4-2 m-mole/kg wet wt. in the intracellular water immediately surrounding the dialysis capillary. 3. The ATP concentration was estimated to be 4-9 m-mole/kg wet wt. 4. A tentative partitioning of Mg among various intracellular constitutents based on present data combined with published work by others is (m-mole/kg wet wt): free, 4-2; MgATP, 4-2; myofibrillar bound, 1; residual (presumably bound to arginine phosphate and phosphate) ca. 1. | [
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|
PMID:17003 | Separative pathways for urea and water, and for chloride in chicken erythrocytes. | 1. Urea and water permeabilities of chicken erythrocytes are considerably lower than those of mammalian red cells. 2. The permeabilities to urea, thiourea and to N-methylurea (about 10(-6) cm/sec at 25 degrees C) were independent of concentration within a very broad range, and we found no evidence of interaction between transport of analogue molecules. The activation energies were between 17 and 19 kcal/mole, and urea transport was not inhibited by phloretin, which inhibits urea transport in mammalian red cells. 3. The water permeability of chicken red cells (as measured by the diffusion of tritiated water) was 1-35 X 10(-3) cm/sec at 25 degrees C. The activation energy was 10 kcal/mole, and the water permeability was not affected by phloretin or parachloromercuribenzoate. 4. It is concluded that the urea and water permeabilities of the chicken erythrocyte membrane are similar to those of a non-porous bimolecular phospholipid membrane. 5. Like the red cells of other animal species the chicken red cell membrane contains an anion transport system, mediating a rapid exchange of chloride across the cell membranes. The pH dependence, temperature dependence, and sensitivity to inhibitors were similar to the properties of the anion transport system found in mammalian red cells. Our study shows, therefore, that the transport system offers a highly specific pathway to the exchange of anions, without presenting an inspecific leak to the permeation of water and urea. | Separative pathways for urea and water, and for chloride in chicken erythrocytes. 1. Urea and water permeabilities of chicken erythrocytes are considerably lower than those of mammalian red cells. 2. The permeabilities to urea, thiourea and to N-methylurea (about 10(-6) cm/sec at 25 degrees C) were independent of concentration within a very broad range, and we found no evidence of interaction between transport of analogue molecules. The activation energies were between 17 and 19 kcal/mole, and urea transport was not inhibited by phloretin, which inhibits urea transport in mammalian red cells. 3. The water permeability of chicken red cells (as measured by the diffusion of tritiated water) was 1-35 X 10(-3) cm/sec at 25 degrees C. The activation energy was 10 kcal/mole, and the water permeability was not affected by phloretin or parachloromercuribenzoate. 4. It is concluded that the urea and water permeabilities of the chicken erythrocyte membrane are similar to those of a non-porous bimolecular phospholipid membrane. 5. Like the red cells of other animal species the chicken red cell membrane contains an anion transport system, mediating a rapid exchange of chloride across the cell membranes. The pH dependence, temperature dependence, and sensitivity to inhibitors were similar to the properties of the anion transport system found in mammalian red cells. Our study shows, therefore, that the transport system offers a highly specific pathway to the exchange of anions, without presenting an inspecific leak to the permeation of water and urea. | [
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|
PMID:17004 | Cell size, macromolecular composition, and O2 consumption during agitated cultivation of Naegleria gruberi. | Cell size, macromolecular composition, carbohydrate utilization patterns, and O2 concentrations were measured throughout the growth stages of Naegleria gruberi in agitated culture in a complex medium. Biphasic logarithmic growth occurred during the intial 83 hr of growth and the mean generation time was 7.0 hr and 19 hr during initial and secondary log growth stages, respectively. The maximum yield was 5 X 10(6) amebae/ml. The pH rose rapidly (1 pH unit) during the secondary log growth phase (52-83 hr) and continued into the stationary growth phase (83-120 hr). Dry weight, total protein, carbohydrate, and RNA per ameba increased just before the secondary log growth phase. RNA increase 31% to 35% per ameba at the end of each phase of log growth. DNA increased approximately 2-fold throughout the different growth phases. Average cell size increased 90% during biphasic log growth then decreased during stationary phase. O2 tension decreased from 100% to 18% of saturation during the biphasic growth phase, then increased during stationary growth to near 100% saturation. Glucose and total carbohydrate assays showed little utilization of those substrates throughout the growth stages. Naegleria gruberi presumably has a predominantly aerobic metabolism, also its metabolism may change during the different growth phases. | Cell size, macromolecular composition, and O2 consumption during agitated cultivation of Naegleria gruberi. Cell size, macromolecular composition, carbohydrate utilization patterns, and O2 concentrations were measured throughout the growth stages of Naegleria gruberi in agitated culture in a complex medium. Biphasic logarithmic growth occurred during the intial 83 hr of growth and the mean generation time was 7.0 hr and 19 hr during initial and secondary log growth stages, respectively. The maximum yield was 5 X 10(6) amebae/ml. The pH rose rapidly (1 pH unit) during the secondary log growth phase (52-83 hr) and continued into the stationary growth phase (83-120 hr). Dry weight, total protein, carbohydrate, and RNA per ameba increased just before the secondary log growth phase. RNA increase 31% to 35% per ameba at the end of each phase of log growth. DNA increased approximately 2-fold throughout the different growth phases. Average cell size increased 90% during biphasic log growth then decreased during stationary phase. O2 tension decreased from 100% to 18% of saturation during the biphasic growth phase, then increased during stationary growth to near 100% saturation. Glucose and total carbohydrate assays showed little utilization of those substrates throughout the growth stages. Naegleria gruberi presumably has a predominantly aerobic metabolism, also its metabolism may change during the different growth phases. | [
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|
PMID:17006 | Use of 1-anilino-8-naphthalene-sulfonate as a probe of gastric vesicle transport. | The interaction of 1-anilino-8-naphthalene-sulfonate (ANS) with vesicles derived from hog fundic mucosa was studied in the presence of valinomycin and with the addition of ATP. Evidence was found for two classes of sites, those rapidly accessible to ANS with a KD of 7.5 micronM and those slowly accessible, but rapidly accessed in the presence of valinomycin with a KD of 2.5 micronM. ATP transiently increases the quantum yield of the latter ANS binding sites only in the presence of valinomycin, but does not alter the number of KD of those sites. The time course of this increase correlates with H+ uptake and Rb+ extrusion by those vesicles and H+ carries such as tetrachlorsalicylanilide or nigericin abolish the ATP response. With ATP addition in the presence of SC14N and valinomycin there is transient uptake of SCN-. It is concluded that ANS is acting as a probe of a structural change dependent on a potential and H+ gradient. | Use of 1-anilino-8-naphthalene-sulfonate as a probe of gastric vesicle transport. The interaction of 1-anilino-8-naphthalene-sulfonate (ANS) with vesicles derived from hog fundic mucosa was studied in the presence of valinomycin and with the addition of ATP. Evidence was found for two classes of sites, those rapidly accessible to ANS with a KD of 7.5 micronM and those slowly accessible, but rapidly accessed in the presence of valinomycin with a KD of 2.5 micronM. ATP transiently increases the quantum yield of the latter ANS binding sites only in the presence of valinomycin, but does not alter the number of KD of those sites. The time course of this increase correlates with H+ uptake and Rb+ extrusion by those vesicles and H+ carries such as tetrachlorsalicylanilide or nigericin abolish the ATP response. With ATP addition in the presence of SC14N and valinomycin there is transient uptake of SCN-. It is concluded that ANS is acting as a probe of a structural change dependent on a potential and H+ gradient. | [
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|
PMID:17007 | Cation transport by gastric H+:K+ ATPase. | A vesicular microsomal fraction isolated from hog fundic mucosa demonstrates the capacity to take up equal amounts of RB+ and Cl-. The amount of the Rb+ uptake is sensitive to the extravesicular osmolarity, and rate of uptake is sensitive to temperature. 86Rb+ efflux is dependent upon the cation composition of the diluting solution. ATP, but not beta-gamma methylene ATP, induces a reversible efflux of 86Rb+ from loaded vesicles, and this is dependent upon a functional K+-ATPase. The ATP induced efflux is not affected by CCCP (carbonyl cyanide m-chlorophenylhydrazone) or TCS (tetrachlorosalicylanilide) nor by lipid soluble ions or valinomycin. Nigericin inhibits the efflux by 40%. Uptake of the lipid soluble ion 14C-SCN- has been demonstrated and is enhanced by ATP only in the presence of valinomycin. The results are consistent with a neutral or isopotential exchange of H+ for Rb+ mediated by K+-ATPase. | Cation transport by gastric H+:K+ ATPase. A vesicular microsomal fraction isolated from hog fundic mucosa demonstrates the capacity to take up equal amounts of RB+ and Cl-. The amount of the Rb+ uptake is sensitive to the extravesicular osmolarity, and rate of uptake is sensitive to temperature. 86Rb+ efflux is dependent upon the cation composition of the diluting solution. ATP, but not beta-gamma methylene ATP, induces a reversible efflux of 86Rb+ from loaded vesicles, and this is dependent upon a functional K+-ATPase. The ATP induced efflux is not affected by CCCP (carbonyl cyanide m-chlorophenylhydrazone) or TCS (tetrachlorosalicylanilide) nor by lipid soluble ions or valinomycin. Nigericin inhibits the efflux by 40%. Uptake of the lipid soluble ion 14C-SCN- has been demonstrated and is enhanced by ATP only in the presence of valinomycin. The results are consistent with a neutral or isopotential exchange of H+ for Rb+ mediated by K+-ATPase. | [
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|
PMID:17008 | Characterization of bile acid binding to rat intestinal brush border membranes. | Studies were performed to characterize the binding1 of bile acids to intestinal brush border membranes. Total 14C-taurodeoxycholate binding was: 1) similar for brush borders prepared from jejunum and ileum, 2) linear with respect to monomer concentration, 3) uninhibited by a structural analog, and 4) not depressed by boiling or trypsin. A linear relationship existed between binding and the number of hydrogen bonds formed by a bile acid and the slope of the line corresponded to delta deltaF of 300 cal/mol. The binding of bile acids to the 105,000 x g supernatant fraction of sonicated brush borders was similar to the binding of phospholipid liposomes using gel chromatography. These data suggest that: 1) the kinetics and characteristics of binding of bile acid to ileal brush borders do not reflect the kinetics and characteristics of active ileal transport previously obtained in whole tissue preparations, but instead reflect the kinetics and characteristics of passive jejunal transport; 2) a determinant of binding is hydrogen bonding with water; 3) isolated intact brush borders are relatively polar membranes; and 4) binding to solubilized brush borders may represent partitioning between the aqueous phase and membrane lipid. | Characterization of bile acid binding to rat intestinal brush border membranes. Studies were performed to characterize the binding1 of bile acids to intestinal brush border membranes. Total 14C-taurodeoxycholate binding was: 1) similar for brush borders prepared from jejunum and ileum, 2) linear with respect to monomer concentration, 3) uninhibited by a structural analog, and 4) not depressed by boiling or trypsin. A linear relationship existed between binding and the number of hydrogen bonds formed by a bile acid and the slope of the line corresponded to delta deltaF of 300 cal/mol. The binding of bile acids to the 105,000 x g supernatant fraction of sonicated brush borders was similar to the binding of phospholipid liposomes using gel chromatography. These data suggest that: 1) the kinetics and characteristics of binding of bile acid to ileal brush borders do not reflect the kinetics and characteristics of active ileal transport previously obtained in whole tissue preparations, but instead reflect the kinetics and characteristics of passive jejunal transport; 2) a determinant of binding is hydrogen bonding with water; 3) isolated intact brush borders are relatively polar membranes; and 4) binding to solubilized brush borders may represent partitioning between the aqueous phase and membrane lipid. | [
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|
PMID:17009 | Purple membrane vesicles: morphology and proton translocation. | Purple membrane vesicles prepared by different techniques differ widely in their morphology and ability to establish a proton gradient in the light. The procedures used to prepare active vesicles do not completely dissociate the purple membrane and thus preserve a preferential orientation of the protein, while most of the lipid is exchanged for added lipid. Responses to illumination are largely determined by the size of the vesicles and the degree to which bacteriorhodopsin is preferentially oriented. Any attempt to compare the interaction of different lipids with bacteriorhodopsin by measuring the pH response must take these factors into account. With an improved technique we have obtained vesicles of rather uniform size and bacteriorhodopsin orientation, which accumulate protons with an initial rate of 160 ng H+ sec-1 mg-1 protein at light intensities of 10(6) erg cm-2 sec-1. The kinetics of the process are complex and at present insufficiently understood. | Purple membrane vesicles: morphology and proton translocation. Purple membrane vesicles prepared by different techniques differ widely in their morphology and ability to establish a proton gradient in the light. The procedures used to prepare active vesicles do not completely dissociate the purple membrane and thus preserve a preferential orientation of the protein, while most of the lipid is exchanged for added lipid. Responses to illumination are largely determined by the size of the vesicles and the degree to which bacteriorhodopsin is preferentially oriented. Any attempt to compare the interaction of different lipids with bacteriorhodopsin by measuring the pH response must take these factors into account. With an improved technique we have obtained vesicles of rather uniform size and bacteriorhodopsin orientation, which accumulate protons with an initial rate of 160 ng H+ sec-1 mg-1 protein at light intensities of 10(6) erg cm-2 sec-1. The kinetics of the process are complex and at present insufficiently understood. | [
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|
PMID:17014 | Effect of pH on hyperthermic cell survival. | Chinese hamster ovary cells incubated with various concentrations of CO2, to obtain extracellular pH values in the range of 6.40-7.85, were heated at 45.5C for 5, 10, or 20 minutes. Thermal sensitivity increased sharply from pH 7.35 to 6.65 (i.e., survival decreased from 1 X 10(-2) to 3 X 10(-5) for 20 minutes of heating), but remained constant from pH 7.35 to 7.85. The enhanced thermal sensitivity at pH values below pth 7.35 suggested that tumors should be preferentially destroyed by heat relative to normal tissue, since reports indicated that tumors were more acidic than the surrounding normal tissue. | Effect of pH on hyperthermic cell survival. Chinese hamster ovary cells incubated with various concentrations of CO2, to obtain extracellular pH values in the range of 6.40-7.85, were heated at 45.5C for 5, 10, or 20 minutes. Thermal sensitivity increased sharply from pH 7.35 to 6.65 (i.e., survival decreased from 1 X 10(-2) to 3 X 10(-5) for 20 minutes of heating), but remained constant from pH 7.35 to 7.85. The enhanced thermal sensitivity at pH values below pth 7.35 suggested that tumors should be preferentially destroyed by heat relative to normal tissue, since reports indicated that tumors were more acidic than the surrounding normal tissue. | [
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|
PMID:17015 | Aryl and heterocyclic diazo compounds as potential environmental electrophiles. | 4-Aminoimidazole-5-carboxamide, a component of human urine derived from the de novo purine biosynthetic pathway, was evidenced to undergo in vivo diazotization in rats following its sequential administration with NaNO2. The diazotization product, 4-diazoimidazole-5-carboxamide, undergoes intramolecular cyclization to yield 2-azahypoxanthine, the urinary presence of which was confirmed mass spectrometrically. 4-Diazoimidazole-5-carboxamide demonstrated dose-related mutagenicity in Salmonella typhimurium TA 100 and represents a potent electrophilic reactant similar to the proposed ultimate carcinogenic forms of arylalkylnitrosamines and arylnitrosamides. It is suggested that aryl and heterocyclic diazo compounds, as a class, warrant further study as environmental electrophiles representing potential biological hazard. | Aryl and heterocyclic diazo compounds as potential environmental electrophiles. 4-Aminoimidazole-5-carboxamide, a component of human urine derived from the de novo purine biosynthetic pathway, was evidenced to undergo in vivo diazotization in rats following its sequential administration with NaNO2. The diazotization product, 4-diazoimidazole-5-carboxamide, undergoes intramolecular cyclization to yield 2-azahypoxanthine, the urinary presence of which was confirmed mass spectrometrically. 4-Diazoimidazole-5-carboxamide demonstrated dose-related mutagenicity in Salmonella typhimurium TA 100 and represents a potent electrophilic reactant similar to the proposed ultimate carcinogenic forms of arylalkylnitrosamines and arylnitrosamides. It is suggested that aryl and heterocyclic diazo compounds, as a class, warrant further study as environmental electrophiles representing potential biological hazard. | [
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|
PMID:17017 | Mosquito transmission of wild turkey malaria, Plasmodium hermani. | Culex nigripalpus experimentally transmitted Plasmodium hermani, a plasmodium of wild turkeys (Meleagris gallopavo) in Florida. The mosquitoes were infected by feeding upon blood induced parasitemias in domestic turkey poults. The resulting sporozoites, transmitted by either mosquito bites or injection, produced malaria infections in domestic poults. | Mosquito transmission of wild turkey malaria, Plasmodium hermani. Culex nigripalpus experimentally transmitted Plasmodium hermani, a plasmodium of wild turkeys (Meleagris gallopavo) in Florida. The mosquitoes were infected by feeding upon blood induced parasitemias in domestic turkey poults. The resulting sporozoites, transmitted by either mosquito bites or injection, produced malaria infections in domestic poults. | [
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|
PMID:17018 | Nosocomial bacteremia. Potential for prevention of procedure-related cases. | During a six-month period, 187 inpatients had bacteremia associated with community-acquired infection and 91 patients had bacteremia from a nosocomial infection. The most frequently identified sites of infection in both types of bacteremia were the respiratory and urinary tracts. Escherichia coli and Diplococcus pneumoniae were the organisms most frequently isolated from cultures of patients with community-acquired bacteremia, and E coli, Staphylococcus aureus, and Klebsiella were most frequently isolated from patients with nosocomial bacteremia. Bacteremic nosocomial infections were related to urinary catheters, respiratory and intravenous therapy, or hyperalimentation in 32 of the 91 cases. Even assuming the unproved hypotheses that rigid adherence to current guidelines would prevent all of these procedure-related cases, 59 cases of bacteremia would still have occurred. This emphasizes the need for further research into prevention of nosocomial infection. | Nosocomial bacteremia. Potential for prevention of procedure-related cases. During a six-month period, 187 inpatients had bacteremia associated with community-acquired infection and 91 patients had bacteremia from a nosocomial infection. The most frequently identified sites of infection in both types of bacteremia were the respiratory and urinary tracts. Escherichia coli and Diplococcus pneumoniae were the organisms most frequently isolated from cultures of patients with community-acquired bacteremia, and E coli, Staphylococcus aureus, and Klebsiella were most frequently isolated from patients with nosocomial bacteremia. Bacteremic nosocomial infections were related to urinary catheters, respiratory and intravenous therapy, or hyperalimentation in 32 of the 91 cases. Even assuming the unproved hypotheses that rigid adherence to current guidelines would prevent all of these procedure-related cases, 59 cases of bacteremia would still have occurred. This emphasizes the need for further research into prevention of nosocomial infection. | [
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|
PMID:17020 | Costs and outcomes for different primary care providers. | This study examined the relationship between levels of medical training and direct costs for 1,700 episodes of acute illness treated in ambulatory-care clinics. Faculty, family practice residents, and physician assistants were included as the providers. Total cost and four component costs were examined. An outcome was defined as good if the patient returned to his usual level of functioning after an acute illness episode. Average total cost per episode was not related to type of provider, but there were significant (P less than .05) differences among providers in laboratory and medication costs. Faculty and physician assistants produced higher costs, especially for patients who experienced bad outcomes. Both costs and percentage of good outcomes achieved were similar in first-, second-, and third-year residents. | Costs and outcomes for different primary care providers. This study examined the relationship between levels of medical training and direct costs for 1,700 episodes of acute illness treated in ambulatory-care clinics. Faculty, family practice residents, and physician assistants were included as the providers. Total cost and four component costs were examined. An outcome was defined as good if the patient returned to his usual level of functioning after an acute illness episode. Average total cost per episode was not related to type of provider, but there were significant (P less than .05) differences among providers in laboratory and medication costs. Faculty and physician assistants produced higher costs, especially for patients who experienced bad outcomes. Both costs and percentage of good outcomes achieved were similar in first-, second-, and third-year residents. | [
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|
PMID:17021 | [In vitro examination on antibacterial activity of ciclacillin (ACPC) against clinically isolated strains (author's transl)]. | (1) The antibacterial acivity of ciclacillin (ACPC) with inoculum size of 10(6) cells/ml was four times less potent than that of ampicillin (ABPC) and 4 approximately 8 times less potent than that of AMPC, but was 4 approximately 8 times more potent than that of CEX against Streptococcus pyogenes. For Streptococcus pneumoniae, ACPC was 2 approximately 4 times less active than ABPC and AMPC, but 16 approximately 32 times more active than CEX. Staphylococcus aureus was 4 approximately 8 times less susceptible to ACPC than to ABPC and AMPC, but 1 approximately 2 times more susceptible than to CEX. Against E. coli, ACPC was as active as CEX, 2 approximately 4 times less active than ABPC, and 4 approximately 8 times less active than AMPC. (2) It was suposed that ACPC was more resistant to penicillinase and more antibacterial with inoculum size of 10(6) cells/ml cells/ml than with 10(6) cells/ml. ACPC was 4 approximately 8 times less active than ABPC, and AMPC against Staphylococcus aureus with 10(8) cells/ml, while with 10(6) cells/ml, it was 2 times less active than ABPC and AMPC. (3) ACPC-resistant strains (greater than or equal to 3.13 microng/ml) of Streptococcus pyogenes and Streptococcus pneumoniae were not found. (4) A difference was noted in MIC of three semi-synthetic penicillins, ACPC, ABPC and AMPC, against Staphylococcus aureus, and E. coli between the sources from which their strains were isolated. (5) There were many strains resistant to erythromycin (EM) and josamycin (JM) (greater than 60%, respectively to both antibiotics) in Stretpococcus pyogenes and pus-isolated Staphylococcus aureus. No strains of Streptococcus pyogenes, were found resistant to EM and JM. | [In vitro examination on antibacterial activity of ciclacillin (ACPC) against clinically isolated strains (author's transl)]. (1) The antibacterial acivity of ciclacillin (ACPC) with inoculum size of 10(6) cells/ml was four times less potent than that of ampicillin (ABPC) and 4 approximately 8 times less potent than that of AMPC, but was 4 approximately 8 times more potent than that of CEX against Streptococcus pyogenes. For Streptococcus pneumoniae, ACPC was 2 approximately 4 times less active than ABPC and AMPC, but 16 approximately 32 times more active than CEX. Staphylococcus aureus was 4 approximately 8 times less susceptible to ACPC than to ABPC and AMPC, but 1 approximately 2 times more susceptible than to CEX. Against E. coli, ACPC was as active as CEX, 2 approximately 4 times less active than ABPC, and 4 approximately 8 times less active than AMPC. (2) It was suposed that ACPC was more resistant to penicillinase and more antibacterial with inoculum size of 10(6) cells/ml cells/ml than with 10(6) cells/ml. ACPC was 4 approximately 8 times less active than ABPC, and AMPC against Staphylococcus aureus with 10(8) cells/ml, while with 10(6) cells/ml, it was 2 times less active than ABPC and AMPC. (3) ACPC-resistant strains (greater than or equal to 3.13 microng/ml) of Streptococcus pyogenes and Streptococcus pneumoniae were not found. (4) A difference was noted in MIC of three semi-synthetic penicillins, ACPC, ABPC and AMPC, against Staphylococcus aureus, and E. coli between the sources from which their strains were isolated. (5) There were many strains resistant to erythromycin (EM) and josamycin (JM) (greater than 60%, respectively to both antibiotics) in Stretpococcus pyogenes and pus-isolated Staphylococcus aureus. No strains of Streptococcus pyogenes, were found resistant to EM and JM. | [
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|
PMID:17025 | Effects of metiamide and propranolol on gastric secretion in anesthetized dogs. | The effects of metiamide, a histamine H2-receptor antagonist, and propranolol, a beta-adrenergic blocking agent, on gastric secretion were studied in anesthetized dogs. Metiamide, 1.45 mg/kg i.v., markedly inhibited the gastric secretion induced by a continuous i.v. infusion of tetragastrin (8 microng/kg-hr), histamine dihydrochloride (160 microng/kg-hr), or methacholine bromide (100 microng/kg-hr). Propranolol 0.5 or 1.0 mg/kg i.v. produced a significant potentiation of tetragastrin-induced gastric secretion but no influence of the secretion induced by methacholine. Propranolol at 5 or 10 mg/kg i.v. produced a slight reduction of the tetragastrin-induced secretion and a significant reduction of methacholine-induced secretion. Histamine-induced gastric secretion was not affected by propranolol at either 1 and 10 mg/kg i.v. These findings lend support to the hypothesis that interactions among histamine, gastrin and acetylcholine receptors do occur though the degree would not be the same in all directions. | Effects of metiamide and propranolol on gastric secretion in anesthetized dogs. The effects of metiamide, a histamine H2-receptor antagonist, and propranolol, a beta-adrenergic blocking agent, on gastric secretion were studied in anesthetized dogs. Metiamide, 1.45 mg/kg i.v., markedly inhibited the gastric secretion induced by a continuous i.v. infusion of tetragastrin (8 microng/kg-hr), histamine dihydrochloride (160 microng/kg-hr), or methacholine bromide (100 microng/kg-hr). Propranolol 0.5 or 1.0 mg/kg i.v. produced a significant potentiation of tetragastrin-induced gastric secretion but no influence of the secretion induced by methacholine. Propranolol at 5 or 10 mg/kg i.v. produced a slight reduction of the tetragastrin-induced secretion and a significant reduction of methacholine-induced secretion. Histamine-induced gastric secretion was not affected by propranolol at either 1 and 10 mg/kg i.v. These findings lend support to the hypothesis that interactions among histamine, gastrin and acetylcholine receptors do occur though the degree would not be the same in all directions. | [
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|
PMID:17026 | Descending release of acetylcholine from the locally distended guinea pig ileum. | The effects of local distension of the intestinal wall on the release of acetylcholine (ACh) from the adjacent non-distended part were studied with the segment os isolated guinea pig ileum. Local distension of the intestinal wall induced the increased release of ACh in the distended part and in its anal side but not in its oral side. Such aboral release of ACh by local distension was abolished by tetrodotoxin or atropine in the concentrations which did not block the release in the distended part. When hexamethonium was applied exclusively to the distending part, significant increase of ACh release was observed in both the regions oral to and anal to the distended part. It is suggested that distension stimuli applied to the myenteric plexus are transmitted aborally along the network of the Auerbach's plexus to the anal direction. The release of ACh from the intestine by nicotine or DMPP differed from the occurring during local distension in that the release was localized to the part of the intestine to which the drug was applied. | Descending release of acetylcholine from the locally distended guinea pig ileum. The effects of local distension of the intestinal wall on the release of acetylcholine (ACh) from the adjacent non-distended part were studied with the segment os isolated guinea pig ileum. Local distension of the intestinal wall induced the increased release of ACh in the distended part and in its anal side but not in its oral side. Such aboral release of ACh by local distension was abolished by tetrodotoxin or atropine in the concentrations which did not block the release in the distended part. When hexamethonium was applied exclusively to the distending part, significant increase of ACh release was observed in both the regions oral to and anal to the distended part. It is suggested that distension stimuli applied to the myenteric plexus are transmitted aborally along the network of the Auerbach's plexus to the anal direction. The release of ACh from the intestine by nicotine or DMPP differed from the occurring during local distension in that the release was localized to the part of the intestine to which the drug was applied. | [
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|
PMID:17028 | Purification of histamine receptor. (IV) Specificity of binding of various drugs to the histamine receptor-rich fraction and to solubilized binding sites. | Studies were made on tritiated histamine binding to the receptor-rich membrane fraction and solubilized sites and its displacement by various drugs. H1-Agonists and antagonists displaced histamine most effectively. A H2-agonist and atropine were less effective and propranolol, phentolamine and imidazole acetic acid had little effect. The solubilized binding sites showed the same specificity of binding as the membrane fraction. Membrane fragments had two binding constants, whereas solubilized sites had only one. Solubilized sites bound similar amounts of histamine and dibenamine: the latter was applied to intact tissue under conditions which would presumably cause specific binding to histamine receptors. These binding characteristics show that the method used was adequate for purification of histamine receptors from smooth muscle of cat small intestine. | Purification of histamine receptor. (IV) Specificity of binding of various drugs to the histamine receptor-rich fraction and to solubilized binding sites. Studies were made on tritiated histamine binding to the receptor-rich membrane fraction and solubilized sites and its displacement by various drugs. H1-Agonists and antagonists displaced histamine most effectively. A H2-agonist and atropine were less effective and propranolol, phentolamine and imidazole acetic acid had little effect. The solubilized binding sites showed the same specificity of binding as the membrane fraction. Membrane fragments had two binding constants, whereas solubilized sites had only one. Solubilized sites bound similar amounts of histamine and dibenamine: the latter was applied to intact tissue under conditions which would presumably cause specific binding to histamine receptors. These binding characteristics show that the method used was adequate for purification of histamine receptors from smooth muscle of cat small intestine. | [
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|
PMID:17031 | [Acquired colour-vision-deficiencies caused by side-effects of pharmacotherapy (author's transl)]. | Acquired colour-vision deficiencies are an early indicator for drug-induced retinopathy as well as drug-induced retrobulbar neuritis. Koellner's rule, which says, that damage of the retina induces a tritan-defect, and damage of the optic nerve induce a red-green-defect is also valid for defects secondary to drug-toxicity. Pseudoisochromatic plates, anomaloscope and other tests (Panel D-15-test) have to be selected correspondingly to use them as screening-methods. | [Acquired colour-vision-deficiencies caused by side-effects of pharmacotherapy (author's transl)]. Acquired colour-vision deficiencies are an early indicator for drug-induced retinopathy as well as drug-induced retrobulbar neuritis. Koellner's rule, which says, that damage of the retina induces a tritan-defect, and damage of the optic nerve induce a red-green-defect is also valid for defects secondary to drug-toxicity. Pseudoisochromatic plates, anomaloscope and other tests (Panel D-15-test) have to be selected correspondingly to use them as screening-methods. | [
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|
PMID:17032 | beta-Adrenergic receptors in rat kidney: direct localization by a fluorescent beta-blocker. | A new fluorescent beta-adrenergic blocker, 9-amino-acridin propranolol (9-AAP), was administered intravenously to albino rats. Fluorescent aggregates of 9-AAP binding sites were concentrated in the vascular poles of the glomeruli in association with the preglomerular afferent arterioles. 9-AAP fluorescence was reduced following pretreatment with (+/-)- and (-)-propranolol and was less affected in rats pretreated by the (+)-racemic isomer. 9-AAP binding sites were also observed on the lining epithelium of the renal collecting system. Our data suggest that 9-AAP may label beta-adrenergic receptors in rat kidney. | beta-Adrenergic receptors in rat kidney: direct localization by a fluorescent beta-blocker. A new fluorescent beta-adrenergic blocker, 9-amino-acridin propranolol (9-AAP), was administered intravenously to albino rats. Fluorescent aggregates of 9-AAP binding sites were concentrated in the vascular poles of the glomeruli in association with the preglomerular afferent arterioles. 9-AAP fluorescence was reduced following pretreatment with (+/-)- and (-)-propranolol and was less affected in rats pretreated by the (+)-racemic isomer. 9-AAP binding sites were also observed on the lining epithelium of the renal collecting system. Our data suggest that 9-AAP may label beta-adrenergic receptors in rat kidney. | [
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|
PMID:17033 | Ultrastructural localization of calcium in normal and abnormal skeletal muscle. | Calcium was demonstrated ultrastructurally as a fine black reaction product with unbuffered 2% saturated potassium pyroantimonate, pH 9.4. In comparison with normal muscle, there was increased precipitate in degenerating skeletal muscle fibers and some degenerating-regenerating fibers occurring in pathologic human muscle, regardless of disease entity, and in experimentally injured rat muscle. The pathologically increased calcium was mainly within the sarcoplasmic reticulum and mitochondria. Both structures could be completely blackened. Nuclear calcium was also increased, the precipitates being localized as circular profiles within the nucleoli and heterochromatin as well as being associated with the nuclear envelope. Myofibrillar calcium was only modestly increased. When normal rat muscle was preincubated in 136 mM calcium-enhanced Hanks' medium, calcium accumulated in the muscle fibers--it was especially heavy in the mitochondria and sarcoplasmic reticulum and appeared identical with the pathologic human and rat muscle fibers. Preincubation of normal rat muscle in 0.1 M acetate buffer (pH 4.65) before calcium loading augmented myofibrillar staining, mainly in the H-zone of the A-bands excluding the M-zone and in broad irregular N1, N2, and "N3" lines of the I-bands. EMMA-4 electron probe microanalysis and EGTA (ethylene glycolbis (beta-aminoethyl ether)N,N'-tetraacetic acid) chelation prior to staining confirmed that the precipitate in the several loci was calcium antimonate. It is proposed that in skeletal muscle fibers injured by various pathologic processes, a breach of the plasmalemma barrier to calcium occurs as a very early abnormality. Extracellular calcium would then pour into the aqueous sarcoplasm of the muscle fiber, from which it would be withdrawn by and accumulated with the still active organelles normally having a great avidity for uptake of this ion, especially the mitochondria and sarcoplasmic reticulum. The resultant organellar calcification would impair function and damage the structure of proteins and phospholipids. | Ultrastructural localization of calcium in normal and abnormal skeletal muscle. Calcium was demonstrated ultrastructurally as a fine black reaction product with unbuffered 2% saturated potassium pyroantimonate, pH 9.4. In comparison with normal muscle, there was increased precipitate in degenerating skeletal muscle fibers and some degenerating-regenerating fibers occurring in pathologic human muscle, regardless of disease entity, and in experimentally injured rat muscle. The pathologically increased calcium was mainly within the sarcoplasmic reticulum and mitochondria. Both structures could be completely blackened. Nuclear calcium was also increased, the precipitates being localized as circular profiles within the nucleoli and heterochromatin as well as being associated with the nuclear envelope. Myofibrillar calcium was only modestly increased. When normal rat muscle was preincubated in 136 mM calcium-enhanced Hanks' medium, calcium accumulated in the muscle fibers--it was especially heavy in the mitochondria and sarcoplasmic reticulum and appeared identical with the pathologic human and rat muscle fibers. Preincubation of normal rat muscle in 0.1 M acetate buffer (pH 4.65) before calcium loading augmented myofibrillar staining, mainly in the H-zone of the A-bands excluding the M-zone and in broad irregular N1, N2, and "N3" lines of the I-bands. EMMA-4 electron probe microanalysis and EGTA (ethylene glycolbis (beta-aminoethyl ether)N,N'-tetraacetic acid) chelation prior to staining confirmed that the precipitate in the several loci was calcium antimonate. It is proposed that in skeletal muscle fibers injured by various pathologic processes, a breach of the plasmalemma barrier to calcium occurs as a very early abnormality. Extracellular calcium would then pour into the aqueous sarcoplasm of the muscle fiber, from which it would be withdrawn by and accumulated with the still active organelles normally having a great avidity for uptake of this ion, especially the mitochondria and sarcoplasmic reticulum. The resultant organellar calcification would impair function and damage the structure of proteins and phospholipids. | [
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|
PMID:17038 | [Prolongated amnesia after "rohypnol" i.v. before local anesthesia and responsiveness during operation (author's transl)]. | An up-to-eight-hour lasting anterograde amnesia is achieved by "Rohypnol" i.v. causing no excitation before local anesthesia is given (prolongation by analgetics, anesthetics, neuroleptics). The cardiovascular functions remain stable with spontaneous breathing and preservation of the swallow and coughing reflexes. During the operation the patient is responsive and cooperative. The patient answers all questions, moves his body into any wanted position and when ordered he performs Valsalva's manoeuver without any remembrane. If not spoken to and having no pain he falls asleep right away. Postoperative vomiting is reduced. The patient feels relaxed after waking up. No complications have been noticed during more than 500 operations. The later questioning of all patients showed only 4 patients (with unsufficient preoperative sedation) who could remember part of the terminal phase of the operation. | [Prolongated amnesia after "rohypnol" i.v. before local anesthesia and responsiveness during operation (author's transl)]. An up-to-eight-hour lasting anterograde amnesia is achieved by "Rohypnol" i.v. causing no excitation before local anesthesia is given (prolongation by analgetics, anesthetics, neuroleptics). The cardiovascular functions remain stable with spontaneous breathing and preservation of the swallow and coughing reflexes. During the operation the patient is responsive and cooperative. The patient answers all questions, moves his body into any wanted position and when ordered he performs Valsalva's manoeuver without any remembrane. If not spoken to and having no pain he falls asleep right away. Postoperative vomiting is reduced. The patient feels relaxed after waking up. No complications have been noticed during more than 500 operations. The later questioning of all patients showed only 4 patients (with unsufficient preoperative sedation) who could remember part of the terminal phase of the operation. | [
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|
PMID:17048 | Effect of chlorhexidine on plaque development in an artificial mouth. | The effect of chlorhexidine on the development of plaque, resulting from the inoculation with saliva of a tooth mounted in an artificial mouth, has been studied. The agent delayed the formation of plaque and also inhibited changes in pH and Eh, whether sucrose was present or not. Applied as a rinse at intervals of 12 h it prevented formation of plaque and pH and Eh remained constant. Moreover, chlorhexidine inhibited pH and Eh changes in established plaque. A single application of a gel containing chlorhexidine also greatly inhibited plaque development. | Effect of chlorhexidine on plaque development in an artificial mouth. The effect of chlorhexidine on the development of plaque, resulting from the inoculation with saliva of a tooth mounted in an artificial mouth, has been studied. The agent delayed the formation of plaque and also inhibited changes in pH and Eh, whether sucrose was present or not. Applied as a rinse at intervals of 12 h it prevented formation of plaque and pH and Eh remained constant. Moreover, chlorhexidine inhibited pH and Eh changes in established plaque. A single application of a gel containing chlorhexidine also greatly inhibited plaque development. | [
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|
PMID:17049 | A microcalorimetric study of the growth of Klebsiella aerogenes in simple salts/glucose media. | Heat output-time records or 'thermograms' produced during the aerobic growth of Klebsiella aerogenes in simple salts/glucose media with growth limiting glucose concentrations of 2.0, 1.0 and 0.5 g dm-3 were obtained using a flow-microcalorimeter fitted with an aerobic cell. These traces are interpreted in terms of the recorded oxygen tension, pH, glucose concentration and bacterial population of the culture. Heat output is greatest during the phase of exponential growth, indicating that here the organisms are most energetically inefficient. During the stationary phase aerobic processes, which give rise to a low oxygen tension, produce a smaller heat output until secondary metabolic processes are complete. | A microcalorimetric study of the growth of Klebsiella aerogenes in simple salts/glucose media. Heat output-time records or 'thermograms' produced during the aerobic growth of Klebsiella aerogenes in simple salts/glucose media with growth limiting glucose concentrations of 2.0, 1.0 and 0.5 g dm-3 were obtained using a flow-microcalorimeter fitted with an aerobic cell. These traces are interpreted in terms of the recorded oxygen tension, pH, glucose concentration and bacterial population of the culture. Heat output is greatest during the phase of exponential growth, indicating that here the organisms are most energetically inefficient. During the stationary phase aerobic processes, which give rise to a low oxygen tension, produce a smaller heat output until secondary metabolic processes are complete. | [
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|
PMID:17065 | Studies of yeast alcohol dehydrogenase with 3-aminopyridine monucleotide. | 3-Aminopyridine mononucleotide, a nicotinamide mononucleotide analog, was prepared by enzymatic cleavage of 3-aminopyridine adenine dinucleotide by a snake venom phosphodiesterase and isolated by means of ion exchange chromatography. The spectrophotometric and fluorometric properties of this analog were studied. Several anions were shown to quench the fluorescence intensity of this analog. pH was shown to have a pronounced effect on the fluorescence intensity. 3-Aminopyridine mononucleotide was shown to be a coenzyme-competitive inhibitor of yeast alcohol dehydrogenase. The 3-aminopyridine mononucleotide was diazotized with the use of nitrous acid. A time dependent irreversible inactivation of yeast alcohol dehydrogenase resulted from incubation with the diazotized 3-aminopyridine mononucleotide at pH 7.0. Incubation of the enzyme with NAD prior to the addition of the diazotized 3-aminopyridine mononucleotid protected the enzyme against inactivation. | Studies of yeast alcohol dehydrogenase with 3-aminopyridine monucleotide. 3-Aminopyridine mononucleotide, a nicotinamide mononucleotide analog, was prepared by enzymatic cleavage of 3-aminopyridine adenine dinucleotide by a snake venom phosphodiesterase and isolated by means of ion exchange chromatography. The spectrophotometric and fluorometric properties of this analog were studied. Several anions were shown to quench the fluorescence intensity of this analog. pH was shown to have a pronounced effect on the fluorescence intensity. 3-Aminopyridine mononucleotide was shown to be a coenzyme-competitive inhibitor of yeast alcohol dehydrogenase. The 3-aminopyridine mononucleotide was diazotized with the use of nitrous acid. A time dependent irreversible inactivation of yeast alcohol dehydrogenase resulted from incubation with the diazotized 3-aminopyridine mononucleotide at pH 7.0. Incubation of the enzyme with NAD prior to the addition of the diazotized 3-aminopyridine mononucleotid protected the enzyme against inactivation. | [
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|
PMID:17066 | [Vaccination complications after oral poliomyelitis vaccination (author's transl)]. | A vaccination complication is only to be recognized if, taking into consideration the incubation time, the clinical picture coincides with that of spontaneous poliomyelitis. Apart from exceptional cases, virological studies are only of importance for the assessment if they are carried out in the acute or subacute stages. Only six out of more than 150 cases could be accepted as vaccination complications. | [Vaccination complications after oral poliomyelitis vaccination (author's transl)]. A vaccination complication is only to be recognized if, taking into consideration the incubation time, the clinical picture coincides with that of spontaneous poliomyelitis. Apart from exceptional cases, virological studies are only of importance for the assessment if they are carried out in the acute or subacute stages. Only six out of more than 150 cases could be accepted as vaccination complications. | [
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|
PMID:17067 | Chronic urticaria as a manifestation of necrotizing venulitis. | In a group of patients with a syndrome consisting of recurrent episodes of urticaria, arthralgia, abdominal pain, and (rarely) glomerulonephritis, examination of skin biopsy specimens showed necrotizing venulitis. An elevated erythrocyte sedimentation rate was the most common laboratory abnormality. Analyses of serum immunoglobulins revealed random abnormalities of immunoglobulin levels, and assessment of the complement system showed two groups of patients--some with hypocomplementemia and others with a normal complement system. In those with hypocomplementemia, there were low levels of C1q, C4 and, occasionally, C3, compatible with activation of the classic complement pathway. Although the cause of this syndrome is unknown, the complement profiles suggest that more than one mechanism of vascular damage may be operative. | Chronic urticaria as a manifestation of necrotizing venulitis. In a group of patients with a syndrome consisting of recurrent episodes of urticaria, arthralgia, abdominal pain, and (rarely) glomerulonephritis, examination of skin biopsy specimens showed necrotizing venulitis. An elevated erythrocyte sedimentation rate was the most common laboratory abnormality. Analyses of serum immunoglobulins revealed random abnormalities of immunoglobulin levels, and assessment of the complement system showed two groups of patients--some with hypocomplementemia and others with a normal complement system. In those with hypocomplementemia, there were low levels of C1q, C4 and, occasionally, C3, compatible with activation of the classic complement pathway. Although the cause of this syndrome is unknown, the complement profiles suggest that more than one mechanism of vascular damage may be operative. | [
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|
PMID:17069 | Isolation of Histoplasma capsulatum from soil in the Aguas Buenos Caves, Aguas Buenos, Puerto Rico. I. An ecological approach. | Only one out of 19 soil sampling sites chosen for isolation of H. capsulatum studies yielded positive results. The stations were located in Cueva Oscura, which is part of the Aguas Buenas Caves system. The habitat characteristics of these station are believed to be responsible for the presence of the fungus. | Isolation of Histoplasma capsulatum from soil in the Aguas Buenos Caves, Aguas Buenos, Puerto Rico. I. An ecological approach. Only one out of 19 soil sampling sites chosen for isolation of H. capsulatum studies yielded positive results. The stations were located in Cueva Oscura, which is part of the Aguas Buenas Caves system. The habitat characteristics of these station are believed to be responsible for the presence of the fungus. | [
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PMID:17072 | X-ray study of the lithium complex of NAD. | The Li+-NAD+ complex exists as a 'dimer' of two molecules arranged head-to-tail with Li+ coordinated tetrahedrally to adenine N(7) and three pyrophosphate oxygens. Adenine is stacked intermolecularly on nicotinamide. The conformation of NAD+ is 'extended' and similar to that found in holoenzyme complexes. This is in contrast to the 'folded' structure proposed from spectroscopic studies. | X-ray study of the lithium complex of NAD. The Li+-NAD+ complex exists as a 'dimer' of two molecules arranged head-to-tail with Li+ coordinated tetrahedrally to adenine N(7) and three pyrophosphate oxygens. Adenine is stacked intermolecularly on nicotinamide. The conformation of NAD+ is 'extended' and similar to that found in holoenzyme complexes. This is in contrast to the 'folded' structure proposed from spectroscopic studies. | [
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|
PMID:17084 | Effect of pyridoxine on the growth of Morris hepatoma No. 7288Ctc and enzyme activity. | The effect(s) of lack of dietary pyridoxine (PX) on the growth of Morris hepatoma no. 7288Ctc was studied. Buffalo strain female rats were fed a diet lacking PX. Pair-fed controls were fed the same diet with PX added. Animals were inoculated with no. 7288Ctc hepatoma cells at 21 days and were sacrificed 16 days later. Host livers and tumors were removed, weights recorded and the activity of tyrosine aminotransferase (TAT; L-tyrosine: 2-oxoglutarate aminotransferase, EC 2.6.1.5) was determined in both host liver and hepatoma. The average weight of 30 hepatomas grown in pair-fed control rats was 11.61 +/- 1.5 g while the average weight of the same number of hepatomas grown in animals fed the PX free diet was 4.73 +/- 0.7 g (P less than 0.001). Further TAT specific activity levels were 39% and 32% higher in host livers and tumors from deficient animals, respectively. The results show that availability of dietary pyridoxine stimulates the growth of this hepatoma and, in addition, exercises a type of control over the expression of TAT activity. | Effect of pyridoxine on the growth of Morris hepatoma No. 7288Ctc and enzyme activity. The effect(s) of lack of dietary pyridoxine (PX) on the growth of Morris hepatoma no. 7288Ctc was studied. Buffalo strain female rats were fed a diet lacking PX. Pair-fed controls were fed the same diet with PX added. Animals were inoculated with no. 7288Ctc hepatoma cells at 21 days and were sacrificed 16 days later. Host livers and tumors were removed, weights recorded and the activity of tyrosine aminotransferase (TAT; L-tyrosine: 2-oxoglutarate aminotransferase, EC 2.6.1.5) was determined in both host liver and hepatoma. The average weight of 30 hepatomas grown in pair-fed control rats was 11.61 +/- 1.5 g while the average weight of the same number of hepatomas grown in animals fed the PX free diet was 4.73 +/- 0.7 g (P less than 0.001). Further TAT specific activity levels were 39% and 32% higher in host livers and tumors from deficient animals, respectively. The results show that availability of dietary pyridoxine stimulates the growth of this hepatoma and, in addition, exercises a type of control over the expression of TAT activity. | [
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PMID:17085 | Expression of hormonally induced tyrosine transaminase in normal, host liver and three Morris hepatomas. | Cytoplasmic tyrosine transaminase (L-tyrosine: 2-oxoglutarate aminotransferase, EC 2.6.1.5) was partially purified from normal, host liver and three Morris hepatomas and subsequently resolved by electrophoresis on polyacrylamide gels. Enzyme activity was detected histochemically in situ on the gels. Seven enzymatically active forms were detected in normal liver. The presence of growing hepatomas altered significantly the expression of this enzyme. Only one, two and four activity peaks were detected in the host liver of animals with highly (most liver-like), well and poorly (least liver-like) differentiated hepatomas, respectively. Similarly, only one, four and six peaks were detected, respectively, in highly, well and poor differentiated hepatomas. | Expression of hormonally induced tyrosine transaminase in normal, host liver and three Morris hepatomas. Cytoplasmic tyrosine transaminase (L-tyrosine: 2-oxoglutarate aminotransferase, EC 2.6.1.5) was partially purified from normal, host liver and three Morris hepatomas and subsequently resolved by electrophoresis on polyacrylamide gels. Enzyme activity was detected histochemically in situ on the gels. Seven enzymatically active forms were detected in normal liver. The presence of growing hepatomas altered significantly the expression of this enzyme. Only one, two and four activity peaks were detected in the host liver of animals with highly (most liver-like), well and poorly (least liver-like) differentiated hepatomas, respectively. Similarly, only one, four and six peaks were detected, respectively, in highly, well and poor differentiated hepatomas. | [
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PMID:17086 | [Allogenic inhibition of the stem hematopoietic cells in the bone marrow of adult mice and in the embryonal liver]. | The maternal effect was shown to influence the degree of allogenic inhibition of stem hemopoietic cells of the embryonic liver and adult bone marrow in CBA and C57Bl/6 mice. The display of allogenic inhibition of stem cells of the embryonic liver and adult bone marrow proved to be similar in C57Bl/6 mice and dissimilar in CBA. | [Allogenic inhibition of the stem hematopoietic cells in the bone marrow of adult mice and in the embryonal liver]. The maternal effect was shown to influence the degree of allogenic inhibition of stem hemopoietic cells of the embryonic liver and adult bone marrow in CBA and C57Bl/6 mice. The display of allogenic inhibition of stem cells of the embryonic liver and adult bone marrow proved to be similar in C57Bl/6 mice and dissimilar in CBA. | [
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|
PMID:17087 | [Effect of syngenic lymphocytes on allogenic inhibition of hematopoietic stem cells of embryonic liver]. | The transplantation of liver from the embryos and newborn C57BL-6 mice to the lethally irradiated hybrids (CBA X C57BL/6) F1resulted in 90% allogenic inhibition of the colony-forming activity of the donor elements. The degree of allogenic inhibition of liver cells of 19 days old embryos and newborn mice may be changed with the help of syngenic lymphocytes of adult mice or delayed transplantation of cells 72 hrs following the irradiation of recipients but these procedures proved to be ineffective with the liver cells of 13 and 16 days old embryos. A suggestion is put forward to the effect that the allogenic inhibition is based on the active reaction of recipient hybrids (CBAXXC57BL/6) F1 to the stem hemopoietic cells of C57BL/6 mice. | [Effect of syngenic lymphocytes on allogenic inhibition of hematopoietic stem cells of embryonic liver]. The transplantation of liver from the embryos and newborn C57BL-6 mice to the lethally irradiated hybrids (CBA X C57BL/6) F1resulted in 90% allogenic inhibition of the colony-forming activity of the donor elements. The degree of allogenic inhibition of liver cells of 19 days old embryos and newborn mice may be changed with the help of syngenic lymphocytes of adult mice or delayed transplantation of cells 72 hrs following the irradiation of recipients but these procedures proved to be ineffective with the liver cells of 13 and 16 days old embryos. A suggestion is put forward to the effect that the allogenic inhibition is based on the active reaction of recipient hybrids (CBAXXC57BL/6) F1 to the stem hemopoietic cells of C57BL/6 mice. | [
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|
PMID:17088 | [NAD+/NADH ratio in the mitochondria of the oocytes and ova of groundling, Misgurnus fossilis (L.)]. | The ratio NAD+/NAD-H was detemined in mitochondria of the loach oocytes and eggs on the basis of concentrations of the glutamate dehydrogenase reaction intermediates. This ratio increases 6 times upon the oocyte maturation. The importance of this ratio in the metabolism of oocyte and embryo is discussed. | [NAD+/NADH ratio in the mitochondria of the oocytes and ova of groundling, Misgurnus fossilis (L.)]. The ratio NAD+/NAD-H was detemined in mitochondria of the loach oocytes and eggs on the basis of concentrations of the glutamate dehydrogenase reaction intermediates. This ratio increases 6 times upon the oocyte maturation. The importance of this ratio in the metabolism of oocyte and embryo is discussed. | [
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PMID:17090 | A comprehensive treatment approach to chronic low back pain. | A comprehensive treatment program for chronic disability related to back disease has been presented. This program has used not only more traditional methods of medical care for the structural disabilities of chronic mechanical back disorders, but has used principles of active patient participation in the improvement process. The patients are educated in the manifestations of pain behavior in the phase II treatment program emphasis on pain sources is downgraded to allow positive reinforcement for healthy behavior to develop. By use of an organized team approach, a significant number of patients can be processed; and an overall reduction in use of alternative medical resources has occurred. | A comprehensive treatment approach to chronic low back pain. A comprehensive treatment program for chronic disability related to back disease has been presented. This program has used not only more traditional methods of medical care for the structural disabilities of chronic mechanical back disorders, but has used principles of active patient participation in the improvement process. The patients are educated in the manifestations of pain behavior in the phase II treatment program emphasis on pain sources is downgraded to allow positive reinforcement for healthy behavior to develop. By use of an organized team approach, a significant number of patients can be processed; and an overall reduction in use of alternative medical resources has occurred. | [
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|
PMID:17092 | Effect of valine on propionate metabolism in control and hyperglycinemic fibroblasts and in rat liver. | Measurement of methylmalonyl-CoA mutase and propionyl-CoA carboxylase activities in lysates from fibroblasts derived from control, nonketotic hyperglycinemia, propionic acidemia, and both vitamin B12-responsive and -nonresponsive variants of methylmalonic acidemia showed only one abnormality: a 59% decrease in carboxylase activity in the nonketotic hyperglycinemic lysates (P less than 0.01). When fibroblasts from all cell types were grown on valine-supplemented (24 mM) media, mutase activity was generally inhibited. As for carboxylase activity, control lines were inhibited 35% as compared to controls without valine and propionic acidemia activity was undetectable. On the other hand, carboxylase activity in both methylmalonic acidemia variants was increased 40% and nonketotic hyperglycinemia carboxylase activity was increased 80% (P less than 0.01) when grown on valine-supplemented media. Isoleucine could not substitute for valine in producing increased carboxylase activity in these mutants. Glycine cleavage activity in fresh rat liver homogenates (11.1 micronmol/gm protein/90 min) did not vary significantly when 24 mM valine was added to the reaction (9.9 micronmol/mg protein/90 min). Therefore, the hyperglycinemia observed in both ketotic and nonketotic forms is probably not caused by a direct effect of valine on the glycine cleavage reaction. These data suggest that the presence of increased amounts of propionic acid in serum or urine does not necessarily rule out the possibility of nonketotic hyperglycinemia due to the decreased activity of the carboxylase enzyme. | Effect of valine on propionate metabolism in control and hyperglycinemic fibroblasts and in rat liver. Measurement of methylmalonyl-CoA mutase and propionyl-CoA carboxylase activities in lysates from fibroblasts derived from control, nonketotic hyperglycinemia, propionic acidemia, and both vitamin B12-responsive and -nonresponsive variants of methylmalonic acidemia showed only one abnormality: a 59% decrease in carboxylase activity in the nonketotic hyperglycinemic lysates (P less than 0.01). When fibroblasts from all cell types were grown on valine-supplemented (24 mM) media, mutase activity was generally inhibited. As for carboxylase activity, control lines were inhibited 35% as compared to controls without valine and propionic acidemia activity was undetectable. On the other hand, carboxylase activity in both methylmalonic acidemia variants was increased 40% and nonketotic hyperglycinemia carboxylase activity was increased 80% (P less than 0.01) when grown on valine-supplemented media. Isoleucine could not substitute for valine in producing increased carboxylase activity in these mutants. Glycine cleavage activity in fresh rat liver homogenates (11.1 micronmol/gm protein/90 min) did not vary significantly when 24 mM valine was added to the reaction (9.9 micronmol/mg protein/90 min). Therefore, the hyperglycinemia observed in both ketotic and nonketotic forms is probably not caused by a direct effect of valine on the glycine cleavage reaction. These data suggest that the presence of increased amounts of propionic acid in serum or urine does not necessarily rule out the possibility of nonketotic hyperglycinemia due to the decreased activity of the carboxylase enzyme. | [
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|
PMID:17093 | Otitis media in children less than 12 weeks of age. | Cases of otitis media in infants under 12 weeks of age were reviewed to delineate the frequency, clinical features, and etiologic agents involved. Tympanocentesis was performed in 42 infants, 0 to 5 weeks of age, and in 17, from 6 to 11 weeks of age. The most common symptoms were irritability/lethargy (69%), fever (52%), cough (36%), vomiting (21%), diarrhea (20%), tachypnea (20%), and anorexia (18%). Associated illnesses were present in 33 (54%) of the patients, the most common being pneumonia (9), bronchiolitis (7), meningitis (6), conjunctivitis (4), and omphalitis (4). No peripartum infections or severe perinatal problems were found. Common respiratory pathogens were the predominant etiologic organisms, but coliform organisms were identified in 18% of the infants under 6 weeks of age. Cultures were sterile or grew organisms of questionable pathogenicity ("nonpathogens") in 39% of specimens. Since the signs and symptoms of otitis media in children less than 12 weeks of age are nonspecific and frequently associated with other major illnesses, the physician caring for these infants needs to be more aware of this disease and the therapeutic problems it presents. | Otitis media in children less than 12 weeks of age. Cases of otitis media in infants under 12 weeks of age were reviewed to delineate the frequency, clinical features, and etiologic agents involved. Tympanocentesis was performed in 42 infants, 0 to 5 weeks of age, and in 17, from 6 to 11 weeks of age. The most common symptoms were irritability/lethargy (69%), fever (52%), cough (36%), vomiting (21%), diarrhea (20%), tachypnea (20%), and anorexia (18%). Associated illnesses were present in 33 (54%) of the patients, the most common being pneumonia (9), bronchiolitis (7), meningitis (6), conjunctivitis (4), and omphalitis (4). No peripartum infections or severe perinatal problems were found. Common respiratory pathogens were the predominant etiologic organisms, but coliform organisms were identified in 18% of the infants under 6 weeks of age. Cultures were sterile or grew organisms of questionable pathogenicity ("nonpathogens") in 39% of specimens. Since the signs and symptoms of otitis media in children less than 12 weeks of age are nonspecific and frequently associated with other major illnesses, the physician caring for these infants needs to be more aware of this disease and the therapeutic problems it presents. | [
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|
PMID:17095 | [Diagnosis of hepatic metastasis by enzymatic assay. Value of gamma-glutamyltranspeptidase]. | Variations in serum enzyme levels were studied in 50 patients suffering from various types of neoplasm, 25 of whom had hepatic metastases. In the absence of any associated hepato-biliary or pancreatic disorder, gamma-glutamyl-transpeptidase would appear to be a reliable test in 96 % of cases. It represents a factor of assessment which merits a place in the prognostic study of all types of neoplasia. | [Diagnosis of hepatic metastasis by enzymatic assay. Value of gamma-glutamyltranspeptidase]. Variations in serum enzyme levels were studied in 50 patients suffering from various types of neoplasm, 25 of whom had hepatic metastases. In the absence of any associated hepato-biliary or pancreatic disorder, gamma-glutamyl-transpeptidase would appear to be a reliable test in 96 % of cases. It represents a factor of assessment which merits a place in the prognostic study of all types of neoplasia. | [
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PMID:17096 | Aminoacylation of tRNA Trp from beef liver, yeast and E. coli by beef pancrease tryptophan-tRNA ligase. Stoichiometry of tRNATrp binding. | The Michaelis constants and the maximum velocities in the aminoacylation reaction of tRNATrp from beef liver, yeast and E. coli by pure beef pancreas tryptophan-tRNA ligase show that this mammalian enzyme recognizes and charges the two eucaryotic tRNAs with the same efficiency. The rate of aminoacylation of the procaryotic tRNATrp by the enzyme is three orders of magnitude lower. The pH optimum of aminoacylation is 8 for both eucaryotic tRNAs. The optimum magnesium concentration is different. The rate is maximum when magnesium concentration is stoichiometric to ATP concentration for tRNATrp from beef liver and 10 mM above ATP concentration for tRNATrp from yeast. The number of binding sites on the enzyme for the two eucaryotic tRNAs has been measured by equilibrium filtration on Sephadex G-100 and found equal to two. | Aminoacylation of tRNA Trp from beef liver, yeast and E. coli by beef pancrease tryptophan-tRNA ligase. Stoichiometry of tRNATrp binding. The Michaelis constants and the maximum velocities in the aminoacylation reaction of tRNATrp from beef liver, yeast and E. coli by pure beef pancreas tryptophan-tRNA ligase show that this mammalian enzyme recognizes and charges the two eucaryotic tRNAs with the same efficiency. The rate of aminoacylation of the procaryotic tRNATrp by the enzyme is three orders of magnitude lower. The pH optimum of aminoacylation is 8 for both eucaryotic tRNAs. The optimum magnesium concentration is different. The rate is maximum when magnesium concentration is stoichiometric to ATP concentration for tRNATrp from beef liver and 10 mM above ATP concentration for tRNATrp from yeast. The number of binding sites on the enzyme for the two eucaryotic tRNAs has been measured by equilibrium filtration on Sephadex G-100 and found equal to two. | [
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