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PMID:9181
Composition of crop and gizzard contents in the laying hen.
Crop and gizzard contents were analysed at six stages of egg formation. 2. The crop was empty during the day and full during the night while the gizzard contained a constant amount of dry matter. The water content of the crop did not change but that of the gizzard was at a minimum just after the ovulation and at a maximum 18 h later. 3. The osmotic pressure of the gizzard contents remained constant and close to that of the blood; that of the crop contents was almost isotonic at oviposition but hypertonic 18 h later. In both organs the pH of the liquid phase varied cyclicly with the egg formation and was lowest during egg shell deposition. 4. The Na+, K+ and Cl- contents of the crop liquid phase did not vary but Ca2+ increased with decreasing pH.Na+ and K+ were also constant in the gizzard liquid phase but Cl- and Ca2+ increased during shell formation. 5. It is concluded that the amount of HCl secreted by the proventiculus is related to egg shell deposition and that calcium solubilisation depends on microbial fermentation in crop and HCl secretion by proventriculus.
Composition of crop and gizzard contents in the laying hen. Crop and gizzard contents were analysed at six stages of egg formation. 2. The crop was empty during the day and full during the night while the gizzard contained a constant amount of dry matter. The water content of the crop did not change but that of the gizzard was at a minimum just after the ovulation and at a maximum 18 h later. 3. The osmotic pressure of the gizzard contents remained constant and close to that of the blood; that of the crop contents was almost isotonic at oviposition but hypertonic 18 h later. In both organs the pH of the liquid phase varied cyclicly with the egg formation and was lowest during egg shell deposition. 4. The Na+, K+ and Cl- contents of the crop liquid phase did not vary but Ca2+ increased with decreasing pH.Na+ and K+ were also constant in the gizzard liquid phase but Cl- and Ca2+ increased during shell formation. 5. It is concluded that the amount of HCl secreted by the proventiculus is related to egg shell deposition and that calcium solubilisation depends on microbial fermentation in crop and HCl secretion by proventriculus.
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PMID:9182
[Guanyl cyclase activities in clonal lines of cultured astroblasts and neuroblasts].
Guanylate cyclase was found to be present in a number of astroblast and neuroblast clones. No correlations were observed between the enzyme activity and the nature of the clone. The enzyme shows a requirement for manganese ions and is stimulated by calcium. When the astroblast clone NN is cultured together with the neuroblast clone M1 for two months and the astroblast cells again isolated, a reduced guanylate cyclase activity was found.
[Guanyl cyclase activities in clonal lines of cultured astroblasts and neuroblasts]. Guanylate cyclase was found to be present in a number of astroblast and neuroblast clones. No correlations were observed between the enzyme activity and the nature of the clone. The enzyme shows a requirement for manganese ions and is stimulated by calcium. When the astroblast clone NN is cultured together with the neuroblast clone M1 for two months and the astroblast cells again isolated, a reduced guanylate cyclase activity was found.
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PMID:9183
[Immunosuppressive role of the liver in the graft versus host reaction].
The ability of the liver to reduce the intensity of the graft versus host (GVH) reaction has been investigated in F1 hybrid rats implanted with parental lymph nodes. Intrahepatic and intrarenal tissue implantations were compared using classical GVH criteria. The intrahepatic implantation of lymph nodes suppress the mortality observed after intrarenal implantation. The results confirm the interest of portal drainage in organ transplantation and suggest a new site of implantation for lymphoid cells.
[Immunosuppressive role of the liver in the graft versus host reaction]. The ability of the liver to reduce the intensity of the graft versus host (GVH) reaction has been investigated in F1 hybrid rats implanted with parental lymph nodes. Intrahepatic and intrarenal tissue implantations were compared using classical GVH criteria. The intrahepatic implantation of lymph nodes suppress the mortality observed after intrarenal implantation. The results confirm the interest of portal drainage in organ transplantation and suggest a new site of implantation for lymphoid cells.
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PMID:9184
[Extraction of LHRH in human urine: study of the extraction of labelled synthetic hormone].
A method of extraction of synthetic LHRH is studied in human urines, using porous glass (Spherosil) and methanol. In the defined conditions the yield is greeter than 80%. It appears that the method is reproducible. The recovery varies essentially with the quantity of Spherosil and the pH of methanal. The use of methanol acidified at pH 3 increases the speed and the importance of labelled LHRH recovery.
[Extraction of LHRH in human urine: study of the extraction of labelled synthetic hormone]. A method of extraction of synthetic LHRH is studied in human urines, using porous glass (Spherosil) and methanol. In the defined conditions the yield is greeter than 80%. It appears that the method is reproducible. The recovery varies essentially with the quantity of Spherosil and the pH of methanal. The use of methanol acidified at pH 3 increases the speed and the importance of labelled LHRH recovery.
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PMID:9185
[Applications of the extraction and of the radioimmunoassay of LH-RH in human urine].
The existence of endogenous LH RH like immunoreactivity is shown in human urines after appropriate extraction, bu the radioimmunoassay of LH RH. In normaly cycling and menopausal women the quantities of endogenous hormone found in urines are greater after acid extraction than those found after extraction at pH 7. Furthermore, the increase observed by extraction in acidified methanol is directly correlated and proportional to the quantity of hormone assayable by extraction at pH 7. The hypothesis of urinary excretion of LH RH as a polymer of immunoreactive units is suggested by this study.
[Applications of the extraction and of the radioimmunoassay of LH-RH in human urine]. The existence of endogenous LH RH like immunoreactivity is shown in human urines after appropriate extraction, bu the radioimmunoassay of LH RH. In normaly cycling and menopausal women the quantities of endogenous hormone found in urines are greater after acid extraction than those found after extraction at pH 7. Furthermore, the increase observed by extraction in acidified methanol is directly correlated and proportional to the quantity of hormone assayable by extraction at pH 7. The hypothesis of urinary excretion of LH RH as a polymer of immunoreactive units is suggested by this study.
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PMID:9186
[Reduction of exercise inudced hyperventilation by blocking beta adrenergic receptors].
In normal subjects, beta-adrenergic blockage by propranolol or pindolol reduces exercise hyperventilation (40 to 60% VO2 max).
[Reduction of exercise inudced hyperventilation by blocking beta adrenergic receptors]. In normal subjects, beta-adrenergic blockage by propranolol or pindolol reduces exercise hyperventilation (40 to 60% VO2 max).
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PMID:9187
[Splenomegaly reaction of the chick embryo following chorio-allantoid graft of chicken-spleen fragments].
The spleen enhancement reaction of the chick embryo, following the insertion (grafting or injection procedure) of homologous spleen cells is one of the results of the graft-versus-host reaction (G.V.H. reaction). Irrespective of the usual kinds of G.V.H. reaction measured, it has been proved that the relation between the number of immuno competent cells and the reaction intensity is linear. Our study shows that the relation is not the same when the chorio-allantois membrane grafting procedure is used instead of injection into the veins. However, two facts remain unchanged 1) the minimal amount of spleen cells sufficient to provoke a spleen enhancement is low, 2) there is a link between the number of homologous spleen cells and the rate of spleen enhancement, but in this case it was not shown to be linear. In the light of this, the role played by the chorio-allantois membrane is being debated.
[Splenomegaly reaction of the chick embryo following chorio-allantoid graft of chicken-spleen fragments]. The spleen enhancement reaction of the chick embryo, following the insertion (grafting or injection procedure) of homologous spleen cells is one of the results of the graft-versus-host reaction (G.V.H. reaction). Irrespective of the usual kinds of G.V.H. reaction measured, it has been proved that the relation between the number of immuno competent cells and the reaction intensity is linear. Our study shows that the relation is not the same when the chorio-allantois membrane grafting procedure is used instead of injection into the veins. However, two facts remain unchanged 1) the minimal amount of spleen cells sufficient to provoke a spleen enhancement is low, 2) there is a link between the number of homologous spleen cells and the rate of spleen enhancement, but in this case it was not shown to be linear. In the light of this, the role played by the chorio-allantois membrane is being debated.
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PMID:9188
[Influence of metabolic alkalosis on adrenaline hyperglycemia of the dog].
The metabolic alkalosis, induced by the administration bicarbonate, reduces adrenaline hyperglycemia in fasted dog.
[Influence of metabolic alkalosis on adrenaline hyperglycemia of the dog]. The metabolic alkalosis, induced by the administration bicarbonate, reduces adrenaline hyperglycemia in fasted dog.
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PMID:9189
Purification and characterization of tonin.
Tonin was purified from rat submaxillary glands by differential centrifugation, ammonium sulphate precipitation, gel filtration on Sephadex G150, and by ion-exchange chromatography on DEAE-cellulose, phospho-cellulose, SP-Sephadex C25, and SP-Sephadex C50. Purified tonin was shown to be homogeneous by analytical electrophoresis and by analytical ultracentrifugation analysis. Purified tonin was very stable when stored in buffers of low pH values or when incubated at high temperatures in neutral solution. The molecular weight estimated by sedimentation equilibrium was 28 700. The pH optimum was near 6.8 in a 0.1 M potassium phosphate buffer. The Michaelis-Menten constant for tonin using angiotensin I as substrate was about 4 X 10(-5) M. Tonin activity was strongly inhibited by plasma. Kinetic studies using angiotensin I as substrate showed that the inhibition of tonin by plasma was of the non-competitive type.
Purification and characterization of tonin. Tonin was purified from rat submaxillary glands by differential centrifugation, ammonium sulphate precipitation, gel filtration on Sephadex G150, and by ion-exchange chromatography on DEAE-cellulose, phospho-cellulose, SP-Sephadex C25, and SP-Sephadex C50. Purified tonin was shown to be homogeneous by analytical electrophoresis and by analytical ultracentrifugation analysis. Purified tonin was very stable when stored in buffers of low pH values or when incubated at high temperatures in neutral solution. The molecular weight estimated by sedimentation equilibrium was 28 700. The pH optimum was near 6.8 in a 0.1 M potassium phosphate buffer. The Michaelis-Menten constant for tonin using angiotensin I as substrate was about 4 X 10(-5) M. Tonin activity was strongly inhibited by plasma. Kinetic studies using angiotensin I as substrate showed that the inhibition of tonin by plasma was of the non-competitive type.
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PMID:9191
A particulate chitin synthase from Aspergillus flavus Link: the properties, location, and levels of activity in mycelium and regenerating protoplast preparations.
Chitin synthase (ED 2.4.1.16) has been characterized in Aspergillus flavus. A K(m) value of 2.5 m(M) was obtained for the substrate UDPGlcNAc. The enzyme had a requirement for GlcNAc, and Mg2+ and activity was increased in the presence of soluble chitodextrins F1 and F2. The optimum activity was obtained using Tris--HCl buffer, pH 7.5, with a secondary peak at pH 6.2 and an incubation temperature of 29.5 degrees C. Distribution patterns of chitin synthase in protoplasts and mycelial material were very similar. The highest specific activity was found in a 200 000 X g fraction. Enzyme levels in growing mycelium increased during the exponential growth phase after which they declined. Activity also increased during the early stages of regeneration of both conidial and mycelial protoplasts, despite an initial lack in net protein synthesis. Chitin synthase levels were also dependent upon the carbon source available during regeneration.
A particulate chitin synthase from Aspergillus flavus Link: the properties, location, and levels of activity in mycelium and regenerating protoplast preparations. Chitin synthase (ED 2.4.1.16) has been characterized in Aspergillus flavus. A K(m) value of 2.5 m(M) was obtained for the substrate UDPGlcNAc. The enzyme had a requirement for GlcNAc, and Mg2+ and activity was increased in the presence of soluble chitodextrins F1 and F2. The optimum activity was obtained using Tris--HCl buffer, pH 7.5, with a secondary peak at pH 6.2 and an incubation temperature of 29.5 degrees C. Distribution patterns of chitin synthase in protoplasts and mycelial material were very similar. The highest specific activity was found in a 200 000 X g fraction. Enzyme levels in growing mycelium increased during the exponential growth phase after which they declined. Activity also increased during the early stages of regeneration of both conidial and mycelial protoplasts, despite an initial lack in net protein synthesis. Chitin synthase levels were also dependent upon the carbon source available during regeneration.
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PMID:9192
Stable L-forms of Clostridium perfringens and their growth on glass surfaces.
L-forms of Clostridium perfringens were induced in brain heart infusion broth containing 10% sucrose and 2 units of penicillin. After a few hours of growth, spheroplasts, granules, and elongated bacilli were apparent. At 24-h intervals, serial subcultures were made in the above medium which resulted in a culture composed entirely of spheroplasts (or protoplasts) and granules. Upon the withdrawal of penicillin these L-form cultures grew well and, after 100 passages, there was no reversion to the bacillary form. Sucrose could also be withdrawn from the medium. The effects of centrifugation, osmotic stabilizer, ultraviolet light, temperature, pH, and lyophilization upon stable L-forms were examined. L-forms were found to attach to the walls of culture tubes during trowth and sheets of L-form growth were obtained on cover slips in Leighton tubes and on the sides of medicine bottles.
Stable L-forms of Clostridium perfringens and their growth on glass surfaces. L-forms of Clostridium perfringens were induced in brain heart infusion broth containing 10% sucrose and 2 units of penicillin. After a few hours of growth, spheroplasts, granules, and elongated bacilli were apparent. At 24-h intervals, serial subcultures were made in the above medium which resulted in a culture composed entirely of spheroplasts (or protoplasts) and granules. Upon the withdrawal of penicillin these L-form cultures grew well and, after 100 passages, there was no reversion to the bacillary form. Sucrose could also be withdrawn from the medium. The effects of centrifugation, osmotic stabilizer, ultraviolet light, temperature, pH, and lyophilization upon stable L-forms were examined. L-forms were found to attach to the walls of culture tubes during trowth and sheets of L-form growth were obtained on cover slips in Leighton tubes and on the sides of medicine bottles.
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PMID:9193
Competition between Phytophthora cinnamomi and Trichoderma spp. in autoclaved soil.
Results from analyses of beta-glucosidase (EC 3.2.1.21) and phosphatase (EC 3.1.3.1;EC 3.1.3.2) activities indicated that presence of a Trichoderma isolate reduced development of Phytophthora cinnamomi. It was also observed that P. cinnamomi was more competitive in coinoculated cultures than in cultures where Trichoderma was added on day 3. Analysis of trehalase (EC 3.2.1.28) activity indicated that Trichoderma either utilized portions of the P. cinnamomi mycelium as substrate or the action of P. cinnamomi released additional nutrients not normally available to Trichoderma. Ther stronger Trichoderma isolate was T. harzianum.
Competition between Phytophthora cinnamomi and Trichoderma spp. in autoclaved soil. Results from analyses of beta-glucosidase (EC 3.2.1.21) and phosphatase (EC 3.1.3.1;EC 3.1.3.2) activities indicated that presence of a Trichoderma isolate reduced development of Phytophthora cinnamomi. It was also observed that P. cinnamomi was more competitive in coinoculated cultures than in cultures where Trichoderma was added on day 3. Analysis of trehalase (EC 3.2.1.28) activity indicated that Trichoderma either utilized portions of the P. cinnamomi mycelium as substrate or the action of P. cinnamomi released additional nutrients not normally available to Trichoderma. Ther stronger Trichoderma isolate was T. harzianum.
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PMID:9194
Antifungal properties of alpha,omega-alkanedicarboxylic acids and their dimethyl esters.
Thirteen alpha, omega-alkanedicarboxylic acids (C2-C12, C14, and C16) and their dimethyl esters were tested against Aspergillus niger, Trichoderma viride, and Myrothecium verrucaria in Sabourauc dextrose agar at pH 4.0 AND 5.6. Toxicity to Canadida albicans, Trichophyton mentagrophytes, and Mucor mucedo was determined in the same medium at pH 5.6 and 7.0 in the absence and presence of 10% beef serum. The dicarboxylic acids possessed very poor to no antifungal activity against all six fungi. The fungitoxicity of the dimethyl esters to A. niger, T. viride, and M. verrucaria was C8 = C9 greater than C7 greater than C6 = C5 greater than C10 greater than C4 greater than C11 and to C. albicans, T. mentagrophytes, and M. mucedo C9 greater than C10 greater than C11 greater than C12 = C8 greater than C7 greater than C6 greater than C5 greater than C4 greater than C3. The fungitoxicity of the esters of fatty acids and alpha-omega-alkanedicarboxylic acids was influenced by chain length and not by the pH of the medium or the absence or presence of beef serum.
Antifungal properties of alpha,omega-alkanedicarboxylic acids and their dimethyl esters. Thirteen alpha, omega-alkanedicarboxylic acids (C2-C12, C14, and C16) and their dimethyl esters were tested against Aspergillus niger, Trichoderma viride, and Myrothecium verrucaria in Sabourauc dextrose agar at pH 4.0 AND 5.6. Toxicity to Canadida albicans, Trichophyton mentagrophytes, and Mucor mucedo was determined in the same medium at pH 5.6 and 7.0 in the absence and presence of 10% beef serum. The dicarboxylic acids possessed very poor to no antifungal activity against all six fungi. The fungitoxicity of the dimethyl esters to A. niger, T. viride, and M. verrucaria was C8 = C9 greater than C7 greater than C6 = C5 greater than C10 greater than C4 greater than C11 and to C. albicans, T. mentagrophytes, and M. mucedo C9 greater than C10 greater than C11 greater than C12 = C8 greater than C7 greater than C6 greater than C5 greater than C4 greater than C3. The fungitoxicity of the esters of fatty acids and alpha-omega-alkanedicarboxylic acids was influenced by chain length and not by the pH of the medium or the absence or presence of beef serum.
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PMID:9197
Tryptophanyl and carboxylic acid residues in the active centre of glucoamylase I from Aspergillus niger.
The pH-dependence of the photo-oxidation of L-tryptophan, in the presence of Rose Bengal and Methylene Blue, has been investigated. True, initial rate constants were determined in order to circumvent errors due to secondary processes. Photo-oxidation of glycoamylase I from A. niger in the presence of Methylene Blue or Rose Bengal resulted in a pH-dependent loss of enzymic activity, which was analogous to the destruction of free L-tryptophan during photo-oxidation. The loss of enzymic activity was closely associated with the destruction of tryptophan residues in the enzyme. Significant protection of both enzymic activity and tryptophanyl residues in the enzyme molecule was achieved by performing the photo-oxidation in the presence of maltose, which is a substrate for the enzyme. The tryptophanyl residues of glucoamylase I, which had been inactivated by reaction of its carboxylic acid residues with glycine methyl ester in the presence of a water-soluble carbodi-imide, were also substantially protected by maltose. It is concluded that the active centre of glucoamylase I is a cleft lined with tryptophanyl residues that participate in the binding of the substrate. One or more carboxylic acid residues are involved in bond cleavage.
Tryptophanyl and carboxylic acid residues in the active centre of glucoamylase I from Aspergillus niger. The pH-dependence of the photo-oxidation of L-tryptophan, in the presence of Rose Bengal and Methylene Blue, has been investigated. True, initial rate constants were determined in order to circumvent errors due to secondary processes. Photo-oxidation of glycoamylase I from A. niger in the presence of Methylene Blue or Rose Bengal resulted in a pH-dependent loss of enzymic activity, which was analogous to the destruction of free L-tryptophan during photo-oxidation. The loss of enzymic activity was closely associated with the destruction of tryptophan residues in the enzyme. Significant protection of both enzymic activity and tryptophanyl residues in the enzyme molecule was achieved by performing the photo-oxidation in the presence of maltose, which is a substrate for the enzyme. The tryptophanyl residues of glucoamylase I, which had been inactivated by reaction of its carboxylic acid residues with glycine methyl ester in the presence of a water-soluble carbodi-imide, were also substantially protected by maltose. It is concluded that the active centre of glucoamylase I is a cleft lined with tryptophanyl residues that participate in the binding of the substrate. One or more carboxylic acid residues are involved in bond cleavage.
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PMID:9198
Production and purification of two hemicellulases from Cephalosporium sacchari.
The production of extracellular hemicellulases by the fungus Cephalosporium sacchari was studied in the presence of various sources of carbon and at various initial pH values and temperatures. Hemicellulose B and holocellulose from spear grass (Heteropogon contortus) were the best sources of carbon, and the optimum temperature was 27 degrees. The initial pH value had little influence on the final yield of hemicellulases. Two hemicellulases (HC-III and HC-IV) were purified by ammonium sulphate precipitation and isoelectric focusing. Their molecular weights were 10,700 and 9,550, and their pI values 9.40 and 6.0, respectively. HC-III hydrolysed hemicellulose B to oligosaccharides without production of monosaccharides.
Production and purification of two hemicellulases from Cephalosporium sacchari. The production of extracellular hemicellulases by the fungus Cephalosporium sacchari was studied in the presence of various sources of carbon and at various initial pH values and temperatures. Hemicellulose B and holocellulose from spear grass (Heteropogon contortus) were the best sources of carbon, and the optimum temperature was 27 degrees. The initial pH value had little influence on the final yield of hemicellulases. Two hemicellulases (HC-III and HC-IV) were purified by ammonium sulphate precipitation and isoelectric focusing. Their molecular weights were 10,700 and 9,550, and their pI values 9.40 and 6.0, respectively. HC-III hydrolysed hemicellulose B to oligosaccharides without production of monosaccharides.
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PMID:9199
Bromine oxidation of methyl alpha- and beta-pyranosides of D-galactose, D-glucose, and D-mannose.
Methyl alpha- and beta-pyranosides of D-galactose, D-glucose, and D-mannose have been oxidized with bromine in aqueous solution at various pH values. The resulting keto glycosides were converted into their more-stable O-methyloxime derivatives which were characterized by spectroscopy and chromatography. Oxidation at a ring carbon atom where the hydrogen is axial is hindered by bulky substituents in syn (i.e., a 1,3) diaxial relationship. Thus, the aglycon group in the alpha anomers protects position 3, the axial HO-4 in galactopyranosides protects position 2, and the axial HO-2 in mannopyranosides protects position 4 from oxidation.
Bromine oxidation of methyl alpha- and beta-pyranosides of D-galactose, D-glucose, and D-mannose. Methyl alpha- and beta-pyranosides of D-galactose, D-glucose, and D-mannose have been oxidized with bromine in aqueous solution at various pH values. The resulting keto glycosides were converted into their more-stable O-methyloxime derivatives which were characterized by spectroscopy and chromatography. Oxidation at a ring carbon atom where the hydrogen is axial is hindered by bulky substituents in syn (i.e., a 1,3) diaxial relationship. Thus, the aglycon group in the alpha anomers protects position 3, the axial HO-4 in galactopyranosides protects position 2, and the axial HO-2 in mannopyranosides protects position 4 from oxidation.
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PMID:9200
Multiple forms of DNA-dependent DNA polymerase during early development and in somatic cells of Xenopus laevis.
Four distinct DNA-dependent DNA polymerase activities (DNA polymerases I, II, III and IV according to the order of elution from a DEAE column) have been separated from extracts of unfertilized Xenopus laevis eggs. The same activities, on the basis of their chromatographic properties, template specificities and sedimentation coefficients, have been found in embryos at least until the gastrula stage. On the other hand, Xenopus kidney cells grown in culture, as well as full grown oocytes lack DNA polymerase I. These data suggest the DNA polymerase I might be a special DNA polymerase activity involved in the extremely rapid DNA synthesis which takes place during early development of X. laevis.
Multiple forms of DNA-dependent DNA polymerase during early development and in somatic cells of Xenopus laevis. Four distinct DNA-dependent DNA polymerase activities (DNA polymerases I, II, III and IV according to the order of elution from a DEAE column) have been separated from extracts of unfertilized Xenopus laevis eggs. The same activities, on the basis of their chromatographic properties, template specificities and sedimentation coefficients, have been found in embryos at least until the gastrula stage. On the other hand, Xenopus kidney cells grown in culture, as well as full grown oocytes lack DNA polymerase I. These data suggest the DNA polymerase I might be a special DNA polymerase activity involved in the extremely rapid DNA synthesis which takes place during early development of X. laevis.
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PMID:9204
[Ionic control of biochemical reactions].
It is shown that pH and ionic strength are tightly interdependent in cytochrome oxidase activity at the level of inner membranes of the mitochondrion, as a direct consequence of the polyanionic environment of this enzyme. Application of polyelectrolyte theory explains a number of biochemical reactions controlled by ionic strength fluctuations.
[Ionic control of biochemical reactions]. It is shown that pH and ionic strength are tightly interdependent in cytochrome oxidase activity at the level of inner membranes of the mitochondrion, as a direct consequence of the polyanionic environment of this enzyme. Application of polyelectrolyte theory explains a number of biochemical reactions controlled by ionic strength fluctuations.
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PMID:9208
Oxidation of lactate by human serum.
The oxidation of lactate by lactate dehydrogenase of human serum is described, and the kinetics of the reaction are examined. It seems that at higher pH values which are optimal for the faster moving isoenzymes of lactate dehydrogenase, slower moving entities show only a part of their activity. In contrast, M type isoenzymes are active at lower pH values, where H type entities are partly inactivated.
Oxidation of lactate by human serum. The oxidation of lactate by lactate dehydrogenase of human serum is described, and the kinetics of the reaction are examined. It seems that at higher pH values which are optimal for the faster moving isoenzymes of lactate dehydrogenase, slower moving entities show only a part of their activity. In contrast, M type isoenzymes are active at lower pH values, where H type entities are partly inactivated.
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PMID:9209
Isoelectric focusing of spectrin components in hereditary spherocytosis.
1. By isoelectric focusing in 8 M urea, spectrin purified from normal human erythrocytes was resolved into 12 to 15 peptide bands differing by their isoelectric point. Most of them were focused between pH 6.4 and 5.2, one at pH 8.7 and some minor components between pH 7.4 and 6.8. 2. The results were not influenced by the erythrocyte population age. 3. Spectrin purified from erythrocytes of five patients with hereditary spherocytosis gave similar isoelectric focusing patterns, with the exception of the lack of the pH 8.7-focused component in two related patients.
Isoelectric focusing of spectrin components in hereditary spherocytosis. 1. By isoelectric focusing in 8 M urea, spectrin purified from normal human erythrocytes was resolved into 12 to 15 peptide bands differing by their isoelectric point. Most of them were focused between pH 6.4 and 5.2, one at pH 8.7 and some minor components between pH 7.4 and 6.8. 2. The results were not influenced by the erythrocyte population age. 3. Spectrin purified from erythrocytes of five patients with hereditary spherocytosis gave similar isoelectric focusing patterns, with the exception of the lack of the pH 8.7-focused component in two related patients.
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PMID:9210
Isolation and characterization of isoenzymes of human salivary and pancreatic alpha-amylase.
Human salivary and pancreatic alpha-amylase (1,4-glucan 4-glucanohydrolase, EC 3.2.1.1) were separated by electrofocusing. In the first case we obtained six isoenzymes with isoelectric points of pH 5.70, 5.72, 6.23, 6.32, 6.73 and 6.88. Human pancreatic alpha-amylase has been separated into eight isoenzymes with isoelectric points of pH 5.72, 5.77, 5.88, 6.05, 6.23, 6.69, 6.72 and 6.95. Some of the isoenzymes were shown to be sialoproteins; others representing about 80% of the total activity did not contain neuraminic acid. The molecular weight of the non-sialoproteinic isoenzymes was found to be about 47 000 in all cases.
Isolation and characterization of isoenzymes of human salivary and pancreatic alpha-amylase. Human salivary and pancreatic alpha-amylase (1,4-glucan 4-glucanohydrolase, EC 3.2.1.1) were separated by electrofocusing. In the first case we obtained six isoenzymes with isoelectric points of pH 5.70, 5.72, 6.23, 6.32, 6.73 and 6.88. Human pancreatic alpha-amylase has been separated into eight isoenzymes with isoelectric points of pH 5.72, 5.77, 5.88, 6.05, 6.23, 6.69, 6.72 and 6.95. Some of the isoenzymes were shown to be sialoproteins; others representing about 80% of the total activity did not contain neuraminic acid. The molecular weight of the non-sialoproteinic isoenzymes was found to be about 47 000 in all cases.
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PMID:9211
Determination of serum urea by mass fragmentography.
A mass fragmentographic method of high accuracy for determination of serum urea is described. A fixed amount of [15N2]urea is added to a fixed amount of serum, then the urea is converted into 5,5-diallyl barbituric acid by coupling with diallyl malonic acid diethyl ester. The barbiturate is then transferred from an alkaline water phase into an organic phase containing methyl iodine by ion-pair extraction using tetrabutyl ammonium as the positive counterion. The amount of urea is determined from the ratio between the recordings at m/e 236 and m/e 238 obtained after analysis with a combined gas chromatograph-mass spectrometer equipped with an MID-unit (multiple-ion detector). The two ions used correspond to the molecular peak in the mass spectrum of the methyl derivative of unlabeled and labeled 5,5-diallyl barbituric acid, respectively. The relative standard deviation of the method was 3.6%. A comparison between the mass fragmentographic method and a routine method for determination of serum urea based on the urease-Berthelot reaction gave a high correlation (r = 0.99) and a regression coefficient of 0.95.
Determination of serum urea by mass fragmentography. A mass fragmentographic method of high accuracy for determination of serum urea is described. A fixed amount of [15N2]urea is added to a fixed amount of serum, then the urea is converted into 5,5-diallyl barbituric acid by coupling with diallyl malonic acid diethyl ester. The barbiturate is then transferred from an alkaline water phase into an organic phase containing methyl iodine by ion-pair extraction using tetrabutyl ammonium as the positive counterion. The amount of urea is determined from the ratio between the recordings at m/e 236 and m/e 238 obtained after analysis with a combined gas chromatograph-mass spectrometer equipped with an MID-unit (multiple-ion detector). The two ions used correspond to the molecular peak in the mass spectrum of the methyl derivative of unlabeled and labeled 5,5-diallyl barbituric acid, respectively. The relative standard deviation of the method was 3.6%. A comparison between the mass fragmentographic method and a routine method for determination of serum urea based on the urease-Berthelot reaction gave a high correlation (r = 0.99) and a regression coefficient of 0.95.
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PMID:9212
Modification of neonatal screening test for erythrocyte glucose-6-phosphate dehydrogenase deficiency.
An improved technique is proposed for detecting G6PD deficiency on dried blood. A simple and rapid ascending chromatography of NADPH makes it possible to differentiate the false positives, too frequently found with Beutler's spot test (1968).
Modification of neonatal screening test for erythrocyte glucose-6-phosphate dehydrogenase deficiency. An improved technique is proposed for detecting G6PD deficiency on dried blood. A simple and rapid ascending chromatography of NADPH makes it possible to differentiate the false positives, too frequently found with Beutler's spot test (1968).
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PMID:9213
Lysyl oxidase activity in human normal skins and postburn scars.
Lysyl oxidase activity of human normal skins derived from the frontal thighs of 33 subjects showed large variations and the mean value was 11 455 +/- 7 172 (S.D.) cpm/g of wet weight tissue. The age of lesion affected the lysyl oxidase activity in postburn scars. Granulation tissues showed a fairly low activity; however, the activity increased sharply within 2--3 months, and reached a significantly higher value than that of normal skin. The high level of activity continued for up to 2--3 years, then gradually decreased to normal range after 5 years or so. Lysyl oxidase activity was detected only after 4 M urea treatment of tissues. Benzylamine oxidase activity also showed large variations in both normal skins and postburn scars, with mean values of: 0.128 +/- 0.077 (S.D.) and 0.145 +/- 0.090 (S.D.) mmol/g of wet weight/h, respectively. No correlation was observed between lysyl oxidase and benzylamine oxidase activities. The granulation tissues showed significantly high values of benzylamine oxidase activity in contrast to the low values of lysyl oxidase activity.
Lysyl oxidase activity in human normal skins and postburn scars. Lysyl oxidase activity of human normal skins derived from the frontal thighs of 33 subjects showed large variations and the mean value was 11 455 +/- 7 172 (S.D.) cpm/g of wet weight tissue. The age of lesion affected the lysyl oxidase activity in postburn scars. Granulation tissues showed a fairly low activity; however, the activity increased sharply within 2--3 months, and reached a significantly higher value than that of normal skin. The high level of activity continued for up to 2--3 years, then gradually decreased to normal range after 5 years or so. Lysyl oxidase activity was detected only after 4 M urea treatment of tissues. Benzylamine oxidase activity also showed large variations in both normal skins and postburn scars, with mean values of: 0.128 +/- 0.077 (S.D.) and 0.145 +/- 0.090 (S.D.) mmol/g of wet weight/h, respectively. No correlation was observed between lysyl oxidase and benzylamine oxidase activities. The granulation tissues showed significantly high values of benzylamine oxidase activity in contrast to the low values of lysyl oxidase activity.
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-0.0003685506817419082, -0.08075965195894241, 0.012749267742037773, 0.058666665107011795, -0.09700674563646317, 0.004658523481339216, -0.05587807297706604, 0.026222148910164833, 0.044517453759908676, -0.037466902285814285, -0.022972801700234413, -0.014335600659251213, 0.018452635034918785, 0.025713039562106133, -0.017345139756798744, -0.051531244069337845, 0.02878895401954651, 0.03679390624165535, 0.0704224556684494, -0.025694791227579117, 0.06464382261037827, -0.06003429740667343, 0.049514297395944595, 0.009859970770776272 ]
PMID:9214
Sensitive radiochemical esterolytic assays for urokinase.
Two radiochemical esterolytic assays for urokinase are described. One assay is based on the urokinase-dependent hydrolysis of Nalpha-acetyl-glycyl-L-lysine [3H]methyl ester and the other on the urokinase-dependent activation of plasminogen and assay of generated plasmin with Nalpha-tosyl-L-arginine [3H]methyl ester. The assays are performed in tubes placed in liquid scintillation counting vials. At the end of the experiment generated [3H]methanol is extracted into the liquid scintillation cocktail and counted. Unhydrolyzed substrate largely remains in the aqueous phase and contributes only a small fraction of the counts. This facile separation of 3H-labeled alcohol from the ester substrate allows the simple and highly sensitive assay for urokinase. The assays give results in good agreement with the classical fibrin plate assay.
Sensitive radiochemical esterolytic assays for urokinase. Two radiochemical esterolytic assays for urokinase are described. One assay is based on the urokinase-dependent hydrolysis of Nalpha-acetyl-glycyl-L-lysine [3H]methyl ester and the other on the urokinase-dependent activation of plasminogen and assay of generated plasmin with Nalpha-tosyl-L-arginine [3H]methyl ester. The assays are performed in tubes placed in liquid scintillation counting vials. At the end of the experiment generated [3H]methanol is extracted into the liquid scintillation cocktail and counted. Unhydrolyzed substrate largely remains in the aqueous phase and contributes only a small fraction of the counts. This facile separation of 3H-labeled alcohol from the ester substrate allows the simple and highly sensitive assay for urokinase. The assays give results in good agreement with the classical fibrin plate assay.
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PMID:9215
Titration of human placental alkaline phosphatase with radioactive orthophosphate.
Human placental alkaline phosphatase incorporates radioactive phosphate specifically and covalently at acid pH. By titration of solutions of the purified enzyme with radioactive orthophosphate, the enzyme was shown to incorporate up to 2 phosphate groups per molecule. No evidence was found to suggest that the two sites had different affinities for phosphate. Similar titrations can be used to determine the molarity of solutions of non-placental alkaline phosphatases of unknown purity, if these also are assumed to possess 2 binding sites per molecule.
Titration of human placental alkaline phosphatase with radioactive orthophosphate. Human placental alkaline phosphatase incorporates radioactive phosphate specifically and covalently at acid pH. By titration of solutions of the purified enzyme with radioactive orthophosphate, the enzyme was shown to incorporate up to 2 phosphate groups per molecule. No evidence was found to suggest that the two sites had different affinities for phosphate. Similar titrations can be used to determine the molarity of solutions of non-placental alkaline phosphatases of unknown purity, if these also are assumed to possess 2 binding sites per molecule.
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PMID:9216
Degradation of arylsulfate by hepatic microsomes.
The enzyme liberated by some treatments and the changes in arylsulfatase C activity in chronic hepatic damage were investigated in rat liver. 1. The enzyme activity liberated by ultrasound was the highest in the conditions studied. 2. Arylsulfatase C was assayed using p-nitrophenyl sulfate in 0.25 M Tris/acetate buffer as substrate. It is shown that this method can be used to measure arylsulfatase C activity in a mixture of arylsulfatases A and B. 3. The enzyme is mainly located in the microsomal fraction in rat liver. In toxic hepatic damage, the enzyme activity decreases from the early stage; decreasing markedly in chronic hepatic damage. The activity seems to reflect damage to the microsomes and therefore arylsulfatase C activity can be a good indicator of injury to liver microsomes.
Degradation of arylsulfate by hepatic microsomes. The enzyme liberated by some treatments and the changes in arylsulfatase C activity in chronic hepatic damage were investigated in rat liver. 1. The enzyme activity liberated by ultrasound was the highest in the conditions studied. 2. Arylsulfatase C was assayed using p-nitrophenyl sulfate in 0.25 M Tris/acetate buffer as substrate. It is shown that this method can be used to measure arylsulfatase C activity in a mixture of arylsulfatases A and B. 3. The enzyme is mainly located in the microsomal fraction in rat liver. In toxic hepatic damage, the enzyme activity decreases from the early stage; decreasing markedly in chronic hepatic damage. The activity seems to reflect damage to the microsomes and therefore arylsulfatase C activity can be a good indicator of injury to liver microsomes.
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PMID:9217
Ultramicromethod for the determination of human arginase in the presence of urea.
A technique for arginase determination in body fluids in the presence of urea is described. [14C]Arginine is hydrolysed by arginase to [14C]urea and ornithine. [14C]Urea is separated with paper chromatography and measured in a liquid scintillation counter. The experimental conditions including the pH, substrate concentration, activator, solvent for chromatography, urea inhibition, and arginase in hemolysates, are discussed.
Ultramicromethod for the determination of human arginase in the presence of urea. A technique for arginase determination in body fluids in the presence of urea is described. [14C]Arginine is hydrolysed by arginase to [14C]urea and ornithine. [14C]Urea is separated with paper chromatography and measured in a liquid scintillation counter. The experimental conditions including the pH, substrate concentration, activator, solvent for chromatography, urea inhibition, and arginase in hemolysates, are discussed.
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PMID:9218
Increased serum gamma-glutamyltransferase in hypertriglyceridemia: comparison with serum pseudocholinesterase.
Both gamma-glutamyltransferase (gammaGT) and pseudocholinesterase (PCE) were found to be increased in hypertriglyceridemic subjects. High values of gammaGT were noted in alcoholic subjects and especially in those with either increased serum triglyceride or alanine aminotransferase higher than 16 mU/ml, while PCE was not significantly changed in alcoholic subjects. Although both enzymes were strongly correlated with the logarithm of serum triglyceride and the prebeta electrophoretic fraction, there were striking differences concerning their behavior in various hypertriglyceridemic subjects. PCE activity was high even in moderate hypertriglyceridemias but its correlation with serum triglyceride had a tendency to flatten with increasing concentration of triglyceride. However, increase of gammaGT was rather characteristic for gross hypetriglyceridemia. Short-term, triglyceride-lowering therapy was accompanied by a tendency to normalization of gammaGT, while PCE values were not influenced. An attempt was made to interpret these changes of serum-enzyme activity in hypertriglyceridemia in connection with mechanisms of lipoprotein synthesis and with the pathogeny of hyperlipemic conditions.
Increased serum gamma-glutamyltransferase in hypertriglyceridemia: comparison with serum pseudocholinesterase. Both gamma-glutamyltransferase (gammaGT) and pseudocholinesterase (PCE) were found to be increased in hypertriglyceridemic subjects. High values of gammaGT were noted in alcoholic subjects and especially in those with either increased serum triglyceride or alanine aminotransferase higher than 16 mU/ml, while PCE was not significantly changed in alcoholic subjects. Although both enzymes were strongly correlated with the logarithm of serum triglyceride and the prebeta electrophoretic fraction, there were striking differences concerning their behavior in various hypertriglyceridemic subjects. PCE activity was high even in moderate hypertriglyceridemias but its correlation with serum triglyceride had a tendency to flatten with increasing concentration of triglyceride. However, increase of gammaGT was rather characteristic for gross hypetriglyceridemia. Short-term, triglyceride-lowering therapy was accompanied by a tendency to normalization of gammaGT, while PCE values were not influenced. An attempt was made to interpret these changes of serum-enzyme activity in hypertriglyceridemia in connection with mechanisms of lipoprotein synthesis and with the pathogeny of hyperlipemic conditions.
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PMID:9219
Circulating tissue antigens. III. Identification and characterization of antigens of limited and of wide body is distribution in human gall bladder bile. Presence in serum of patients with acute hepatitis.
Three antigens shared by bile and tissues (BT-1, BT-2 and BT-3) and one shared by bile and saliva (BA) were identified in human gallbladder bile by immunodiffusion. The former were detected in all bile specimens examined, whereas the latter was detected only in half. BT-1 was limited in distribution to kidney, urine and bile; whereas BT-2 and BT-3 were widely distributed mainly in liver, lung and bile. The antigens were not present in biles of other mammals tested, with the exception of BA which was also present in Rhesus monkey. All antigens were inactivated by Pronase, had relative electrophoretic mobilities of serum globulins and separated from each other in Sephadex G-200 gel filtration and ammonium sulphate fractionation. Ethanol inactivated BT-1 and precipitated the other antigens. BT-2 and BA were relatively resistant to boiling temperature and acid pH, whereas BT-1 and BT-3 were susceptible. Antigens BT-2 and BT-3 were detected in serum of patients with acute hepatitis but not of patients with other diseases or of normal controls.
Circulating tissue antigens. III. Identification and characterization of antigens of limited and of wide body is distribution in human gall bladder bile. Presence in serum of patients with acute hepatitis. Three antigens shared by bile and tissues (BT-1, BT-2 and BT-3) and one shared by bile and saliva (BA) were identified in human gallbladder bile by immunodiffusion. The former were detected in all bile specimens examined, whereas the latter was detected only in half. BT-1 was limited in distribution to kidney, urine and bile; whereas BT-2 and BT-3 were widely distributed mainly in liver, lung and bile. The antigens were not present in biles of other mammals tested, with the exception of BA which was also present in Rhesus monkey. All antigens were inactivated by Pronase, had relative electrophoretic mobilities of serum globulins and separated from each other in Sephadex G-200 gel filtration and ammonium sulphate fractionation. Ethanol inactivated BT-1 and precipitated the other antigens. BT-2 and BA were relatively resistant to boiling temperature and acid pH, whereas BT-1 and BT-3 were susceptible. Antigens BT-2 and BT-3 were detected in serum of patients with acute hepatitis but not of patients with other diseases or of normal controls.
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PMID:9221
Generation of ammonia from non-urea sources in a faecal incubation system.
1. A 25% faecal suspension in sodium chloride solution, incubated anaerobically at 37 degrees C for 48 h, showed excellent survival of all the main groups of faecal bacteria. 2. All faecal incubation systems studied generated large amounts of ammonia, particularly those in which bacterial counts fell during incubation. As normal faeces contain negligible amounts of urea this ammonia must have been generated from sources other than urea. 3. Ammonia was also generated by faeces delivered by sodium chloride enema, and by ileostomy fluid, indicating that the phenomenon is not confined to distal colonic contents. 4. Ammonia generation by incubated faeces was inhibited by prior autoclaving of the sample, but not by sterilization with gamma-irradiation. 5. Generation of ammonia by incubated stool was accompanied by release of large amounts of organic anion and a fall in pH. 6. These observations are interpreted as evidence that ammonia generated within the colon in situ is not derived exclusively from urea, but also from bacterial deamination of amino acids, peptides and proteins. Simultaneously bacterial activity generates large amounts of organacid. The presence of living bacteria is not essential for ammonia generation, provided that bacterial enzymes are present. 7. Bacterial generation of organic solute in faeces which have left the body is sufficiently rapid to cast serious doubts on the validity of faecal centrifugation, or other time-consuming techniques involving lengthy handling of faeces, as methods of obtaining extracellular faecal fluid for measurements of organic constituents or ammonia.
Generation of ammonia from non-urea sources in a faecal incubation system. 1. A 25% faecal suspension in sodium chloride solution, incubated anaerobically at 37 degrees C for 48 h, showed excellent survival of all the main groups of faecal bacteria. 2. All faecal incubation systems studied generated large amounts of ammonia, particularly those in which bacterial counts fell during incubation. As normal faeces contain negligible amounts of urea this ammonia must have been generated from sources other than urea. 3. Ammonia was also generated by faeces delivered by sodium chloride enema, and by ileostomy fluid, indicating that the phenomenon is not confined to distal colonic contents. 4. Ammonia generation by incubated faeces was inhibited by prior autoclaving of the sample, but not by sterilization with gamma-irradiation. 5. Generation of ammonia by incubated stool was accompanied by release of large amounts of organic anion and a fall in pH. 6. These observations are interpreted as evidence that ammonia generated within the colon in situ is not derived exclusively from urea, but also from bacterial deamination of amino acids, peptides and proteins. Simultaneously bacterial activity generates large amounts of organacid. The presence of living bacteria is not essential for ammonia generation, provided that bacterial enzymes are present. 7. Bacterial generation of organic solute in faeces which have left the body is sufficiently rapid to cast serious doubts on the validity of faecal centrifugation, or other time-consuming techniques involving lengthy handling of faeces, as methods of obtaining extracellular faecal fluid for measurements of organic constituents or ammonia.
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PMID:9222
The effect of pH on folic acid absorption in man.
1. Pteroylmonoglutamic acid (PteGlu) absorption has been measured by using the technique of small-intestinal perfusion with tritiated PteGlu in normal subjects and in patients with coeliac disease. 2. At similar intrajejunal pH, patients with untreated coeliac disease have significantly less PTEGlu than normal subjects and patients with treated coeliac disease. 3. The "resting" pH in the jejunum did not differ markedly between normal subjects and patients with coeliac disease. 4. Increasing pH decreased PteGlu absorption in patients with coeliac disease and in normal subjects. 5. These findings suggest that PteGlu malabsorption in coeliac disease is not due to abnormally high pH in the jejunum.
The effect of pH on folic acid absorption in man. 1. Pteroylmonoglutamic acid (PteGlu) absorption has been measured by using the technique of small-intestinal perfusion with tritiated PteGlu in normal subjects and in patients with coeliac disease. 2. At similar intrajejunal pH, patients with untreated coeliac disease have significantly less PTEGlu than normal subjects and patients with treated coeliac disease. 3. The "resting" pH in the jejunum did not differ markedly between normal subjects and patients with coeliac disease. 4. Increasing pH decreased PteGlu absorption in patients with coeliac disease and in normal subjects. 5. These findings suggest that PteGlu malabsorption in coeliac disease is not due to abnormally high pH in the jejunum.
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PMID:9268
The function of a psychiatric unit in a general hospital -- a five year experience.
The author reviews his five years experience with a psychiatric unit in a general hospital. He reviews the American Literature noting such units are thought to be important. There has been no discussion of the community roles of such units. From his experience, he recommends such units play a limited but specific function in the medical and mental health delivery system.
The function of a psychiatric unit in a general hospital -- a five year experience. The author reviews his five years experience with a psychiatric unit in a general hospital. He reviews the American Literature noting such units are thought to be important. There has been no discussion of the community roles of such units. From his experience, he recommends such units play a limited but specific function in the medical and mental health delivery system.
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PMID:9270
Antihistamines: pharmacology and clinical use.
Antihistamines are a diverse group of drugs which possess the ability to inhibit various histaminic actions. By and large, they bear a certain structural resemblance to histamine, and act principally to prevent histamine-receptor interaction through competition with histamine for histamine receptors. Consequently, they are helpful therapeutically in preventing, rather than reversing, histaminic actions. Individual antihistaminic drugs act to inhibit histaminic action at one or another histamine receptor (H1 or H2-receptor), but not at both receptors. The large number of antihistaminics which have been available for many years and employed chiefly as 'antiallergic' drugs are classified as H1-receptor inhibitors; they are most effective therapeutically in inhibiting manifestations of histamine-induced wheal and erythema formation and pruritus. H2-receptor inhibitors, agents which are able to inhibit histamine-induced gastric acid secretion, have been developed more recently. Antihistaminics in general and H1-receptor inhibitors in particular, exert a wide variety of pharmacological activities. Their use is frequently accompanied by undesirable side-effects, notably CNS depression, dryness of mucous membranes, and gastrointestinal effects. Used judiciously and in proper dosage, antihistaminic drugs are helpful in the control of allergic disorders, allergic rhinitis and urticaria in particular; newly developed H2-receptor inhibitors show therapeutic promise in the treatment of peptic ulceration.
Antihistamines: pharmacology and clinical use. Antihistamines are a diverse group of drugs which possess the ability to inhibit various histaminic actions. By and large, they bear a certain structural resemblance to histamine, and act principally to prevent histamine-receptor interaction through competition with histamine for histamine receptors. Consequently, they are helpful therapeutically in preventing, rather than reversing, histaminic actions. Individual antihistaminic drugs act to inhibit histaminic action at one or another histamine receptor (H1 or H2-receptor), but not at both receptors. The large number of antihistaminics which have been available for many years and employed chiefly as 'antiallergic' drugs are classified as H1-receptor inhibitors; they are most effective therapeutically in inhibiting manifestations of histamine-induced wheal and erythema formation and pruritus. H2-receptor inhibitors, agents which are able to inhibit histamine-induced gastric acid secretion, have been developed more recently. Antihistaminics in general and H1-receptor inhibitors in particular, exert a wide variety of pharmacological activities. Their use is frequently accompanied by undesirable side-effects, notably CNS depression, dryness of mucous membranes, and gastrointestinal effects. Used judiciously and in proper dosage, antihistaminic drugs are helpful in the control of allergic disorders, allergic rhinitis and urticaria in particular; newly developed H2-receptor inhibitors show therapeutic promise in the treatment of peptic ulceration.
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PMID:9273
Quantitative study of secondary structure of histones H1, H2A, and H4 in solution by infrared spectroscopy.
The secondary structure of histones H1, H2A, and H4 (F1, F2a2, and F2a1) has been quantitatively studied in heavy water (2H2O) solutions in a wide range of histone concentration, p2H, and concentration of sodium chloride using an improved infrared spectroscopy method. Under all conditions there are about 5--10% of alpha helix. Conditions favourable for aggregation induce formation of antiparallel pleated sheet structure to an extent of about 15% in H1 and H2A and about 30% in H4. When the p2H and concentration of NaCl are in the physiological range, there is the same content of this structure in H2A and H4 and none in H1.
Quantitative study of secondary structure of histones H1, H2A, and H4 in solution by infrared spectroscopy. The secondary structure of histones H1, H2A, and H4 (F1, F2a2, and F2a1) has been quantitatively studied in heavy water (2H2O) solutions in a wide range of histone concentration, p2H, and concentration of sodium chloride using an improved infrared spectroscopy method. Under all conditions there are about 5--10% of alpha helix. Conditions favourable for aggregation induce formation of antiparallel pleated sheet structure to an extent of about 15% in H1 and H2A and about 30% in H4. When the p2H and concentration of NaCl are in the physiological range, there is the same content of this structure in H2A and H4 and none in H1.
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PMID:9274
Photolysis of desmosine and isodesmosine by ultraviolet light.
1. Desmosine and isodesmosine were separated by ion-exchange and paper chromatography, after acid hydrolysis of purified elastin from beef ligamentum nuchae. The fractions obtained by ion-exchange chromatography were clearly mixtures of related compounds. The desmosine fraction could be resolved into seven compounds and the isodesmosine into four by paper chromatography. 2. Desmosine was maximally degraded by irradiation at 274 nm and isodesmosine at 285 nm. These wavelengths did not correspond to the absorption maxima of the cross links, but to shoulders of the main absorption peaks. 3. When irradiated at their optimum wavelengths, but at various pH, both desmosine and isodesmosine seemed quite stable at pH greater than 8.5. Between pH 8 and 5, the photolytic rate was maximum and decreased slightly at more acidic pH. Below pH 4.0, one of the products of photolysis was free lysine. 4. In analogy to the mechanism of the photolytic degradation of N-methyl pyridinium chloride, it appears that the (iso)desmosines were degraded via the formation of an open amino aldehyde, which was hydrolysed at acid pH to give free lysine and a substituted glutaconic aldehyde.
Photolysis of desmosine and isodesmosine by ultraviolet light. 1. Desmosine and isodesmosine were separated by ion-exchange and paper chromatography, after acid hydrolysis of purified elastin from beef ligamentum nuchae. The fractions obtained by ion-exchange chromatography were clearly mixtures of related compounds. The desmosine fraction could be resolved into seven compounds and the isodesmosine into four by paper chromatography. 2. Desmosine was maximally degraded by irradiation at 274 nm and isodesmosine at 285 nm. These wavelengths did not correspond to the absorption maxima of the cross links, but to shoulders of the main absorption peaks. 3. When irradiated at their optimum wavelengths, but at various pH, both desmosine and isodesmosine seemed quite stable at pH greater than 8.5. Between pH 8 and 5, the photolytic rate was maximum and decreased slightly at more acidic pH. Below pH 4.0, one of the products of photolysis was free lysine. 4. In analogy to the mechanism of the photolytic degradation of N-methyl pyridinium chloride, it appears that the (iso)desmosines were degraded via the formation of an open amino aldehyde, which was hydrolysed at acid pH to give free lysine and a substituted glutaconic aldehyde.
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PMID:9275
Effect of inhibitors on the substrate-dependent quenching of 9-aminoacridine fluorescence in inside-out membrane vesicles of Escherichia coli.
The effect of various inhibitors on the substrate-dependent quenching of the fluorescence of 9-aminoacridine was measured in inside-out membrane vesicles of Escherichia coli. The rate of fluorescence quenching in the presence of inhibitors was dependent on the rate of electron transfer through the respiratory chain with NADH, succinate, D-lactate or DL-glycerol 3-phosphate as substrates. Several patterns of response were given by the inhibitors. Inhibitors competitive with substrate, or those acting only on the dehydrogenases, gave a direct relationship between the extent of inhibition of oxidase activity and the rate of quenching. A biphasic relationship was given by 2-heptyl-4-hydroxyquinoline N-oxide and piericidin A which was due to these compounds acting both as inhibitors of the respiratory chain and, at higher concentrations, as uncoupling agents. Uncouplers inhibited fluorescence quenching with minimal inhibition of oxidase activity. The transmembrane pH difference was calculated from the extent of fluorescence quenching and the intravesicular volume. The maximum pH difference of 3.3--3.7 units was generated by each of the substrates tested.
Effect of inhibitors on the substrate-dependent quenching of 9-aminoacridine fluorescence in inside-out membrane vesicles of Escherichia coli. The effect of various inhibitors on the substrate-dependent quenching of the fluorescence of 9-aminoacridine was measured in inside-out membrane vesicles of Escherichia coli. The rate of fluorescence quenching in the presence of inhibitors was dependent on the rate of electron transfer through the respiratory chain with NADH, succinate, D-lactate or DL-glycerol 3-phosphate as substrates. Several patterns of response were given by the inhibitors. Inhibitors competitive with substrate, or those acting only on the dehydrogenases, gave a direct relationship between the extent of inhibition of oxidase activity and the rate of quenching. A biphasic relationship was given by 2-heptyl-4-hydroxyquinoline N-oxide and piericidin A which was due to these compounds acting both as inhibitors of the respiratory chain and, at higher concentrations, as uncoupling agents. Uncouplers inhibited fluorescence quenching with minimal inhibition of oxidase activity. The transmembrane pH difference was calculated from the extent of fluorescence quenching and the intravesicular volume. The maximum pH difference of 3.3--3.7 units was generated by each of the substrates tested.
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PMID:9276
8-Azidoacenine analogs of NAD+ and FAD. Synthesis and coenzyme properties with NAD+-dependent and FAD-dependent enzymes.
The synthesis and purification of the 8-azidoadenine analogs of NAD+ (azido-NAD+) and FAD (AZIDO-FAD) from 8-azidoadenosine 5'-phosphate and NMN+ or FMN, respectively, is described. The coenzyme analogs are characterized by absorption, nuclear magnetic resonance and circular dichroism spectra. The two latter methods indicate a folded structure of azido-NAD+ and azido-FAD. Upon irradiation at 300 mn in aqueous solution, a change of the ultraviolet absorption spectra of the coenzyme analogs indicates photolysis of the azido group. The coenzyme properties of azido-NAD+ are demonstrated with lactate, glutamate and alcohol dehydrogenase yielding 14, 154 and 60%, respectively, of the V observed with NAD+. Concomitantly, the Km values of the coenzyme analogs are 1.7, 3.5 and 3-fold higher than those of NAD+. Azido-FAD is shown to be coenzyme of apo-glucose oxidase. The recovery of activity, however, is much slower in the presence of azido-FAD than with FAD. A final value of 66% of the activity with FAD is obtained. With apo-D-amino acid oxidase, azido-FAD is completely inactive, although it is specifically bound to the enzyme.
8-Azidoacenine analogs of NAD+ and FAD. Synthesis and coenzyme properties with NAD+-dependent and FAD-dependent enzymes. The synthesis and purification of the 8-azidoadenine analogs of NAD+ (azido-NAD+) and FAD (AZIDO-FAD) from 8-azidoadenosine 5'-phosphate and NMN+ or FMN, respectively, is described. The coenzyme analogs are characterized by absorption, nuclear magnetic resonance and circular dichroism spectra. The two latter methods indicate a folded structure of azido-NAD+ and azido-FAD. Upon irradiation at 300 mn in aqueous solution, a change of the ultraviolet absorption spectra of the coenzyme analogs indicates photolysis of the azido group. The coenzyme properties of azido-NAD+ are demonstrated with lactate, glutamate and alcohol dehydrogenase yielding 14, 154 and 60%, respectively, of the V observed with NAD+. Concomitantly, the Km values of the coenzyme analogs are 1.7, 3.5 and 3-fold higher than those of NAD+. Azido-FAD is shown to be coenzyme of apo-glucose oxidase. The recovery of activity, however, is much slower in the presence of azido-FAD than with FAD. A final value of 66% of the activity with FAD is obtained. With apo-D-amino acid oxidase, azido-FAD is completely inactive, although it is specifically bound to the enzyme.
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PMID:9277
Glutathione reductase from human erythrocytes. Catalytic properties and aggregation.
The catalytic properties of glutathione reductase from human erythrocytes have been studied over a range of buffer conditions and substrate concentrations. This study provides optimal conditions for determining the basic kinetic parameters of the enzyme. The catalytic behaviour of glutathione reductase is consistent with spatially separated binding sites for its substrates. In certain assays anomalies were observed which are correlated with an inactivation of the enzyme by NADPH. Concurrent sedimentation experiments showed that NADPH promoted aggregation of the enzyme. Both inactivation and aggregation could be connected with oxidation of thiols at the active site. The relation of the properties of glutathione reductase to cellular conditions is discussed.
Glutathione reductase from human erythrocytes. Catalytic properties and aggregation. The catalytic properties of glutathione reductase from human erythrocytes have been studied over a range of buffer conditions and substrate concentrations. This study provides optimal conditions for determining the basic kinetic parameters of the enzyme. The catalytic behaviour of glutathione reductase is consistent with spatially separated binding sites for its substrates. In certain assays anomalies were observed which are correlated with an inactivation of the enzyme by NADPH. Concurrent sedimentation experiments showed that NADPH promoted aggregation of the enzyme. Both inactivation and aggregation could be connected with oxidation of thiols at the active site. The relation of the properties of glutathione reductase to cellular conditions is discussed.
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PMID:9278
Phosphate binding to chromatophores of Rhodospirillum rubrum.
Equilibrium dialysis has been used to determine the binding of phosphate to chromatophores of Rhodospirillum rubrum. Assuming a complete exchange of the added 32Pi with endogenous phosphate, the saturation with phosphate retained in any form by chromatophores was reached at about 20 nmoles Pi per mg of bacteriochlorophyll. The retention of phosphate had a pH optimum at pH 6.5 to 6.8. At pH 8.0 only chromatophores which have not been liberated from DNA and RNA show a considerable retention of phosphate. However, illumination of chromatophores prior to dialysis in the presence of ADP leads to a retention of phosphate at pH 8.0 which persists during dark dialysis in the absence of added magnesium.
Phosphate binding to chromatophores of Rhodospirillum rubrum. Equilibrium dialysis has been used to determine the binding of phosphate to chromatophores of Rhodospirillum rubrum. Assuming a complete exchange of the added 32Pi with endogenous phosphate, the saturation with phosphate retained in any form by chromatophores was reached at about 20 nmoles Pi per mg of bacteriochlorophyll. The retention of phosphate had a pH optimum at pH 6.5 to 6.8. At pH 8.0 only chromatophores which have not been liberated from DNA and RNA show a considerable retention of phosphate. However, illumination of chromatophores prior to dialysis in the presence of ADP leads to a retention of phosphate at pH 8.0 which persists during dark dialysis in the absence of added magnesium.
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PMID:9279
The role of interchain disulphide bridges in the conformational stability of human immunoglobulin G1 subclass. Hydrogen-deuterium exchange studies.
The hydrogen-deuterium exchange data of human immunoglobulin G1 (IgG1) are interpreted by assuming fast fluctuations of the protein conformation, through which the peptide groups become exposed to the solvent. The probability of solvent exposure of peptide hydrogens reflects a rather loose conformation for native IgG in comparison with other globular proteins. The probability of solvent exposure is greater than 10(-3) for half of the peptide groups, which shows that the conformational transitions by which these groups are exposed to the solvent are accompanied by changes in standard free energy less than 17 kJ/mol (4 kcal/mol). In the range of pH 6.2-8.45, at 25 degrees C no gross conformational changes are reflected in the hydrogen-deuterium exchange behaviour of the native, the reduced-nonalkylated-reassociated and the reduced-S-alkylated-reassociated IgG1. No difference could be detected in the conformational stability of the native and reoxidised reassociated IgG1 proteins. The lack of inter-subunit disulphide bridges in S-alkylated-reassociated molecules results in an increased conformational motility. This destabilization of protein conformation affects about 90% of the peptide groups covered by the measurements, and corresponds to changes in standard free energy of 8 kJ/mol on the average.
The role of interchain disulphide bridges in the conformational stability of human immunoglobulin G1 subclass. Hydrogen-deuterium exchange studies. The hydrogen-deuterium exchange data of human immunoglobulin G1 (IgG1) are interpreted by assuming fast fluctuations of the protein conformation, through which the peptide groups become exposed to the solvent. The probability of solvent exposure of peptide hydrogens reflects a rather loose conformation for native IgG in comparison with other globular proteins. The probability of solvent exposure is greater than 10(-3) for half of the peptide groups, which shows that the conformational transitions by which these groups are exposed to the solvent are accompanied by changes in standard free energy less than 17 kJ/mol (4 kcal/mol). In the range of pH 6.2-8.45, at 25 degrees C no gross conformational changes are reflected in the hydrogen-deuterium exchange behaviour of the native, the reduced-nonalkylated-reassociated and the reduced-S-alkylated-reassociated IgG1. No difference could be detected in the conformational stability of the native and reoxidised reassociated IgG1 proteins. The lack of inter-subunit disulphide bridges in S-alkylated-reassociated molecules results in an increased conformational motility. This destabilization of protein conformation affects about 90% of the peptide groups covered by the measurements, and corresponds to changes in standard free energy of 8 kJ/mol on the average.
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PMID:9280
Equilibrium studies on the refolding and reactivation of rabbit-muscle aldolase after acid dissociation.
Dissociation, denaturation, and deactivation of aldolase from rabbit muscle in the acid pH range have been investigated using sedimentation analysis, fluorescence, circular dichroism, and activity tests. Under comparable experimental conditions the pH-dependent profiles of deactivation and denaturation parallel the dissociation of the enzyme. In the range of dissociation at pH4-5tetramers and monomers are in equilibrium. Intrinsic chromophores and far-ultraviolet circular dichroism suggest the transition to be a complex multistep process. At pH approximately 2.3 the enzyme is split into its fully inactive monomers which still contain some residual secondary structure. After reassociation under optimum conditions (0.2 M phosphate buffer pH 7.6, 1 mM EDTA, 0.1 mM dithiothreitol, 0 degrees C, enzyme concentration 0.4-59 mug/ml) up to 95% enzymic activity is recovered which belongs to a renatured tetrameric species indistinguishable from the native enzyme by all available biochemical and physicochemical criteria.
Equilibrium studies on the refolding and reactivation of rabbit-muscle aldolase after acid dissociation. Dissociation, denaturation, and deactivation of aldolase from rabbit muscle in the acid pH range have been investigated using sedimentation analysis, fluorescence, circular dichroism, and activity tests. Under comparable experimental conditions the pH-dependent profiles of deactivation and denaturation parallel the dissociation of the enzyme. In the range of dissociation at pH4-5tetramers and monomers are in equilibrium. Intrinsic chromophores and far-ultraviolet circular dichroism suggest the transition to be a complex multistep process. At pH approximately 2.3 the enzyme is split into its fully inactive monomers which still contain some residual secondary structure. After reassociation under optimum conditions (0.2 M phosphate buffer pH 7.6, 1 mM EDTA, 0.1 mM dithiothreitol, 0 degrees C, enzyme concentration 0.4-59 mug/ml) up to 95% enzymic activity is recovered which belongs to a renatured tetrameric species indistinguishable from the native enzyme by all available biochemical and physicochemical criteria.
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PMID:9281
The non-convalent binding of small molecules by ligandin. Interactions with steroids and their conjugates, fatty acids, bromosulphophthalein carcinogens, glutathione and realted compounds.
1. Equilibrium dialysis studies have been made of the binding of a number of small molecules by rat ligandin. Direct measurements of binding together with competition experiments indicated that bromosulphophthalein, oestrone sulphate and dehydroepiandrosterone sulphate each bind at the same single primary binding site with association constants of 1.1 X 10(7), 6.6 X 10(5) and 2.6 X 10(5) 1/mol respectively at pH 7.0,IO.16M,4 degrees C. As well as bromosulphophthalein and dehydroepiandrosterone sulphate, a number of strucurally similar organic anions including 2-hydroxyoestradiol-glutathione oestrone glycyronide, N-methyl-4-aminoazobenzene-glutathione and several bile acids, were able to displace oestrone sulphate from ligandin in a manner consistent with competition at a single binding site. From these experiments association constants for the competing ligands were derived; these were inthe range 1 X 10(4)-1 X 10(6) 1/mol. 2. Ligandin was found to bind a number of compounds for which, because of their low aqueous solubilities relative to their binding affinities complete binding isotherms could bot be obtained. These included several steroids (but not cortisol), 20-methylcholanthrene, diethylstilboestrol, oleate and palmitate. Oestrone sulphate was able to compete with these ligands for binding and the results of the competition experiments were interpretable in terms of 1:1 competition at a single binding site. 3. In general the conjugation of non-polar ligands with sulphate or glutathione resulted in increased affinities, but such increases were relatively small (approximately 15% in therms of free energy) implying that the main driving force for the binding of both the conjugated and unconjugated species was the hydrophobic effect. This conclusion is borne out by the observations that both oestrone and its sulphate showed slight increases in affinity with increase in ionic strength, as would be expected for hydrophobic interactions. 4. As well as non-polar compounds and organic anions, ligandin was also found to bind sulphate and glucuronate to a measurable degree, and to interact quite strongly with glutathione. For the latter compound a single binding site was found with an association constant of 1 X 10(5) 1/mol. Glutathione was able to cause the dissociation of the ligandin-oestrone sulphate complex, but this effect was not explicable in terms of simple 1:1 competition. 5. Both oestrone and oestrone sulphare were bound most strongly at pH 6-7, the affinity of the protein for these ligands falling off quite sharply on either side of this maximum. 6. The affinities of ligandin for bromosulphophthalein, steroids and their conjugates, diethylstilboestrol and N,N-dimethyl-4-aminoazobenzene are similar in magnitude to those of serum albumin and aminoazodye-binding protein A (B. Ketterer, E. Tipping, J.F. Hackney and D. Beale, 1976).
The non-convalent binding of small molecules by ligandin. Interactions with steroids and their conjugates, fatty acids, bromosulphophthalein carcinogens, glutathione and realted compounds. 1. Equilibrium dialysis studies have been made of the binding of a number of small molecules by rat ligandin. Direct measurements of binding together with competition experiments indicated that bromosulphophthalein, oestrone sulphate and dehydroepiandrosterone sulphate each bind at the same single primary binding site with association constants of 1.1 X 10(7), 6.6 X 10(5) and 2.6 X 10(5) 1/mol respectively at pH 7.0,IO.16M,4 degrees C. As well as bromosulphophthalein and dehydroepiandrosterone sulphate, a number of strucurally similar organic anions including 2-hydroxyoestradiol-glutathione oestrone glycyronide, N-methyl-4-aminoazobenzene-glutathione and several bile acids, were able to displace oestrone sulphate from ligandin in a manner consistent with competition at a single binding site. From these experiments association constants for the competing ligands were derived; these were inthe range 1 X 10(4)-1 X 10(6) 1/mol. 2. Ligandin was found to bind a number of compounds for which, because of their low aqueous solubilities relative to their binding affinities complete binding isotherms could bot be obtained. These included several steroids (but not cortisol), 20-methylcholanthrene, diethylstilboestrol, oleate and palmitate. Oestrone sulphate was able to compete with these ligands for binding and the results of the competition experiments were interpretable in terms of 1:1 competition at a single binding site. 3. In general the conjugation of non-polar ligands with sulphate or glutathione resulted in increased affinities, but such increases were relatively small (approximately 15% in therms of free energy) implying that the main driving force for the binding of both the conjugated and unconjugated species was the hydrophobic effect. This conclusion is borne out by the observations that both oestrone and its sulphate showed slight increases in affinity with increase in ionic strength, as would be expected for hydrophobic interactions. 4. As well as non-polar compounds and organic anions, ligandin was also found to bind sulphate and glucuronate to a measurable degree, and to interact quite strongly with glutathione. For the latter compound a single binding site was found with an association constant of 1 X 10(5) 1/mol. Glutathione was able to cause the dissociation of the ligandin-oestrone sulphate complex, but this effect was not explicable in terms of simple 1:1 competition. 5. Both oestrone and oestrone sulphare were bound most strongly at pH 6-7, the affinity of the protein for these ligands falling off quite sharply on either side of this maximum. 6. The affinities of ligandin for bromosulphophthalein, steroids and their conjugates, diethylstilboestrol and N,N-dimethyl-4-aminoazobenzene are similar in magnitude to those of serum albumin and aminoazodye-binding protein A (B. Ketterer, E. Tipping, J.F. Hackney and D. Beale, 1976).
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PMID:9282
Specificity and properties of the destabilization, induced by initiation factor IF-3, of ternary complexes of the 30-S ribosomal subunit, aminoacyl-tRNA and polynucleotides.
Initiation factor IF-3 causes the destabilization of preformed ternary complexes of 30-S ribosomal subunit, codons and aminoacyl-tRNAs or peptidyl-tRNA. This destabilization is dilution-dependent and affects all ternary complexes with the exception of those containing the initiator fMet-tRNA, which remain more resistant to IF-3-induced destabilization under the various conditions studied. Several possible reasons for this specificity have been examined. It was found that the basis for the specificity is not: (a) an intrinsic greater stability of the ternary complexes containing fMet-tRNA, (b) the amoung of aminoacyl-tRNA bound to the ribosome, (c) the conditions under which the ternary complex is made or (d) the formylation of the amino group. On the other hand, the nature of the polynucleotide in response to which the ternary complex is formed was found to influence the amount of aminoacyl-tRan bound to the ribosome, and to some extent the amount of aminoacyl-tRNA which can be relased. The ternary complex containing the mischarged initiator tRNA fVal-tRNAfMet displays greater resistance to the IF-3-induced destabilization than the complex containing fVal-tRNAVal. These results indicate that the specificity of the IF-3 activity is due to the special structural feature of the initiator tRNA molecule and to some extent to the nature of the polynucleotide. The IF-3-induced destabilization of ternary complexes was found to be little affected by variations in reaction conditons, so that this IF-3 activity can be used to measure the stoichiometric binding of IF-3 to the ribosome over a broad range of pH and K+ and Mg2+ concentrations. Several antibiotics have been tested for their capacity to interfere with this reaction; only high concentrations of tetracycline blocked this IF-3 activity.
Specificity and properties of the destabilization, induced by initiation factor IF-3, of ternary complexes of the 30-S ribosomal subunit, aminoacyl-tRNA and polynucleotides. Initiation factor IF-3 causes the destabilization of preformed ternary complexes of 30-S ribosomal subunit, codons and aminoacyl-tRNAs or peptidyl-tRNA. This destabilization is dilution-dependent and affects all ternary complexes with the exception of those containing the initiator fMet-tRNA, which remain more resistant to IF-3-induced destabilization under the various conditions studied. Several possible reasons for this specificity have been examined. It was found that the basis for the specificity is not: (a) an intrinsic greater stability of the ternary complexes containing fMet-tRNA, (b) the amoung of aminoacyl-tRNA bound to the ribosome, (c) the conditions under which the ternary complex is made or (d) the formylation of the amino group. On the other hand, the nature of the polynucleotide in response to which the ternary complex is formed was found to influence the amount of aminoacyl-tRan bound to the ribosome, and to some extent the amount of aminoacyl-tRNA which can be relased. The ternary complex containing the mischarged initiator tRNA fVal-tRNAfMet displays greater resistance to the IF-3-induced destabilization than the complex containing fVal-tRNAVal. These results indicate that the specificity of the IF-3 activity is due to the special structural feature of the initiator tRNA molecule and to some extent to the nature of the polynucleotide. The IF-3-induced destabilization of ternary complexes was found to be little affected by variations in reaction conditons, so that this IF-3 activity can be used to measure the stoichiometric binding of IF-3 to the ribosome over a broad range of pH and K+ and Mg2+ concentrations. Several antibiotics have been tested for their capacity to interfere with this reaction; only high concentrations of tetracycline blocked this IF-3 activity.
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PMID:9283
Amino-acid sequence of a coelenterate toxin: toxin II from Anemonia sulcata.
Toxin II from Anemonia sulcata, the main component of the sea anemone venom, consists of 47 amino acid residues which are interconnected by three disulfide bridges. The S-aminoethylated polypeptide was coupled to activated glass beads and sequenced to position 33 by automated solid-phase Edman degradation. Blanks arising from anchor points and the rest of the sequence were determined from tryptic peptides of the [14C]carboxymethylated toxin. Toxin II shows no significant homologies with other known sequences of neurotoxins or cardiotoxins. It might constitute a new class of polypeptide toxins.
Amino-acid sequence of a coelenterate toxin: toxin II from Anemonia sulcata. Toxin II from Anemonia sulcata, the main component of the sea anemone venom, consists of 47 amino acid residues which are interconnected by three disulfide bridges. The S-aminoethylated polypeptide was coupled to activated glass beads and sequenced to position 33 by automated solid-phase Edman degradation. Blanks arising from anchor points and the rest of the sequence were determined from tryptic peptides of the [14C]carboxymethylated toxin. Toxin II shows no significant homologies with other known sequences of neurotoxins or cardiotoxins. It might constitute a new class of polypeptide toxins.
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PMID:9284
The role of lysine-41 in ribonuclease A studied by proton-magnetic-resonance spectroscopy of guanidinated ribonuclease A.
Ribonuclease A has been guanidinated at the lysine residues and the nona-guanidinated and deca-guanidinated (fully substituted) products separated. In confirmation of an earlier report by Glick and Barnard (1970), it has been shown by chemical procedures that the former derivative is not reacted at lysine-41. Guanidination of lysine-41 to produce the fully substituted product causes loss of enzymic activity without any apparent change of conformation, as tested by conformational comparisons (using proton magnetic resonance spectroscopy) including (a) difference spectroscopy, evidence for the involvement of lysine-41 in a catalytic role in the enzyme. Dimethylation of lysine-41 of nona-guanidinated ribonuclease A produces sharp proton resonances which shifts as the dimethylamino group is titrated and allow the determination of an apparent pK of 8.8 for unsubstituted lysine-41.
The role of lysine-41 in ribonuclease A studied by proton-magnetic-resonance spectroscopy of guanidinated ribonuclease A. Ribonuclease A has been guanidinated at the lysine residues and the nona-guanidinated and deca-guanidinated (fully substituted) products separated. In confirmation of an earlier report by Glick and Barnard (1970), it has been shown by chemical procedures that the former derivative is not reacted at lysine-41. Guanidination of lysine-41 to produce the fully substituted product causes loss of enzymic activity without any apparent change of conformation, as tested by conformational comparisons (using proton magnetic resonance spectroscopy) including (a) difference spectroscopy, evidence for the involvement of lysine-41 in a catalytic role in the enzyme. Dimethylation of lysine-41 of nona-guanidinated ribonuclease A produces sharp proton resonances which shifts as the dimethylamino group is titrated and allow the determination of an apparent pK of 8.8 for unsubstituted lysine-41.
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PMID:9285
Biosynthesis of stizolobinic acid and stizolobic acid in higher plants. An enzyme system(s) catalyzing the conversion of dihydroxyphenylalanine into stizolobinic acid and stizolobic acid from etiolated seedlings of Stizolobium hassjoo.
It was demonstrated that an enzyme system(s) extracted from etiolated seedlings of Stizolobium hassjoo catalyzed the conversion of L-dihydroxyphenylalanine into stizolobinic acid, alpha-amino-6-carboxy-2-oxo-2H-pyran-3-propionic acid, and stizolobic acid, alpha-amino-6-carboxy-2-oxo-2H-pyran-4-propionic acid, in the presence of NADP+ or NAD+ under aerobic conditions. Enzymically synthesized radioactive stizolobinic acid and stizolobic acid isolated from the reaction mixtures were purified and confirmed to have constant specific radioactivities by cocrystallization with authentic samples. Maximal activity of the enzyme preparation was obtained by using an insoluble polyphenol adsorbent (Polyclar AT) and a reducing agent (araboascorbic acid) in the extraction medium and by subsequent fractionation of the extract with ammonium sulfate followed by Sephadex G-25 gel filtration. Catalytic activity of the enzyme preparation was more unstable under aerobic condition than anaerobic. Attempts to stabilise the enzyme activity were made by the use of many substances which are known to stabilise other enzymes or expected to arrest the inactivation. Evidence is provided in this paper that the previously proposed biosynthetic pathways of stizolobinic acid and stizolobic acid from dihydroxyphenylalanine proceeded in the cell-free system from etiolated seedlings of S. hassjoo.
Biosynthesis of stizolobinic acid and stizolobic acid in higher plants. An enzyme system(s) catalyzing the conversion of dihydroxyphenylalanine into stizolobinic acid and stizolobic acid from etiolated seedlings of Stizolobium hassjoo. It was demonstrated that an enzyme system(s) extracted from etiolated seedlings of Stizolobium hassjoo catalyzed the conversion of L-dihydroxyphenylalanine into stizolobinic acid, alpha-amino-6-carboxy-2-oxo-2H-pyran-3-propionic acid, and stizolobic acid, alpha-amino-6-carboxy-2-oxo-2H-pyran-4-propionic acid, in the presence of NADP+ or NAD+ under aerobic conditions. Enzymically synthesized radioactive stizolobinic acid and stizolobic acid isolated from the reaction mixtures were purified and confirmed to have constant specific radioactivities by cocrystallization with authentic samples. Maximal activity of the enzyme preparation was obtained by using an insoluble polyphenol adsorbent (Polyclar AT) and a reducing agent (araboascorbic acid) in the extraction medium and by subsequent fractionation of the extract with ammonium sulfate followed by Sephadex G-25 gel filtration. Catalytic activity of the enzyme preparation was more unstable under aerobic condition than anaerobic. Attempts to stabilise the enzyme activity were made by the use of many substances which are known to stabilise other enzymes or expected to arrest the inactivation. Evidence is provided in this paper that the previously proposed biosynthetic pathways of stizolobinic acid and stizolobic acid from dihydroxyphenylalanine proceeded in the cell-free system from etiolated seedlings of S. hassjoo.
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PMID:9286
Isolation and partial characterization of the cytochrome oxidase from Rhodopseudomonas palustris.
The cytochrome oxidase (EC 1.9.3.1) of Rhodopseudomonas palustris was extracted with Triton X-100 plus KCl, from the membrane fraction of cells grown aerobically in the dark. The solubilized enzyme was purified by (NH4)2SO4 precipitation and chromatography on DEAE-cellulose. The purification resulted in a 108-fold enrichment of cytochrome oxidase on the basis of specific activity when compared to the membrane fraction. The purified enzyme was phosphate-sensitive (less than mM), oxidized reduced bovine, horse and yeast cytochrome c, and was inhibited 50% by 0.5 muM KCN or 7 muM NaN3. The native purified preparation migrated as one band in polyacrylamide gel electrophoresis. In the presence of dodecylsulfate four major polypeptides with apparent molecular weights of 30500, 25500, 12200 and 9500 were observed. The enzyme reacted with oxygen via cytochrome o. The purified preparation contained cytochrome c but was free of flavoproteins and NADH-linked and succinate-linked enzyme activities of the respiratory chain.
Isolation and partial characterization of the cytochrome oxidase from Rhodopseudomonas palustris. The cytochrome oxidase (EC 1.9.3.1) of Rhodopseudomonas palustris was extracted with Triton X-100 plus KCl, from the membrane fraction of cells grown aerobically in the dark. The solubilized enzyme was purified by (NH4)2SO4 precipitation and chromatography on DEAE-cellulose. The purification resulted in a 108-fold enrichment of cytochrome oxidase on the basis of specific activity when compared to the membrane fraction. The purified enzyme was phosphate-sensitive (less than mM), oxidized reduced bovine, horse and yeast cytochrome c, and was inhibited 50% by 0.5 muM KCN or 7 muM NaN3. The native purified preparation migrated as one band in polyacrylamide gel electrophoresis. In the presence of dodecylsulfate four major polypeptides with apparent molecular weights of 30500, 25500, 12200 and 9500 were observed. The enzyme reacted with oxygen via cytochrome o. The purified preparation contained cytochrome c but was free of flavoproteins and NADH-linked and succinate-linked enzyme activities of the respiratory chain.
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PMID:9287
Distinct steps in the specific binding of tRNA to aminoacyl-tRNA synthetase. Temperature-jump studies on the serine-specific system from yeast and the tyrosine-specific system from Escherichia coli.
The kinetics of the interaction of tRNASer and seryl-tRNA synthetase from yeast as well as of tRNATyr and tyrosyl-tRNA synthetase from Escherichia coli have been investigated by temperature-jump experiments. It could be shown that complex formation proceeds in two distinct steps. This was demonstrated for both the first and the second binding site. The two-step mechanism was deduced from the characteristic concentration dependence of the relaxation times. Seryl-tRNA synthetase recombines with the first tRNA to form an intermediate complex (kI12, kI21), which is transformed in a fast reaction to the final 1:1 complex (kI23, kI32). At pH 7.2 with 0.1 M KCl the rate constants are: kI12 = 2.7 X 10(8) M-1 S-1; kI23, kI32). At pH 7.2 with 0.1 M KCl the rate constants are: kI12 = 2.7 x 10(8) M-1 S-1; kI21 = 220 S-1; kI23 = 760 S-1; kI32 = 330 S-1. The 1:1 complex can bind a second tRNA. At pH 7.2 without added salt the rate constants are: KII2 = 0.9 X 10(8) M-1 S-1; kII21 = 270 S-1; kII23 = 120 S-1; kII32 = 1250 S-1. The tyrosine-specific system behaves very similarly to the serine-specific system. Data are given for pH 7.2 (pH 6.0) for the binding of the second tRNA: kII12 = 1 X 10(8) (2.5 X 10(8)) M-1 S-1; kII21 = 470 (170) S-1; kII23 = 150 (530) S-1; kII32 = 1540 (720) S-1. The kinetic results are discussed in terms of their relevance to the recognition process and their relation to the anticooperative binding behaviour of tRNA to synthetase.
Distinct steps in the specific binding of tRNA to aminoacyl-tRNA synthetase. Temperature-jump studies on the serine-specific system from yeast and the tyrosine-specific system from Escherichia coli. The kinetics of the interaction of tRNASer and seryl-tRNA synthetase from yeast as well as of tRNATyr and tyrosyl-tRNA synthetase from Escherichia coli have been investigated by temperature-jump experiments. It could be shown that complex formation proceeds in two distinct steps. This was demonstrated for both the first and the second binding site. The two-step mechanism was deduced from the characteristic concentration dependence of the relaxation times. Seryl-tRNA synthetase recombines with the first tRNA to form an intermediate complex (kI12, kI21), which is transformed in a fast reaction to the final 1:1 complex (kI23, kI32). At pH 7.2 with 0.1 M KCl the rate constants are: kI12 = 2.7 X 10(8) M-1 S-1; kI23, kI32). At pH 7.2 with 0.1 M KCl the rate constants are: kI12 = 2.7 x 10(8) M-1 S-1; kI21 = 220 S-1; kI23 = 760 S-1; kI32 = 330 S-1. The 1:1 complex can bind a second tRNA. At pH 7.2 without added salt the rate constants are: KII2 = 0.9 X 10(8) M-1 S-1; kII21 = 270 S-1; kII23 = 120 S-1; kII32 = 1250 S-1. The tyrosine-specific system behaves very similarly to the serine-specific system. Data are given for pH 7.2 (pH 6.0) for the binding of the second tRNA: kII12 = 1 X 10(8) (2.5 X 10(8)) M-1 S-1; kII21 = 470 (170) S-1; kII23 = 150 (530) S-1; kII32 = 1540 (720) S-1. The kinetic results are discussed in terms of their relevance to the recognition process and their relation to the anticooperative binding behaviour of tRNA to synthetase.
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PMID:9288
Mechanism of discrimination between cognate and non-cognate tRNAs by phenylalanyl-tRNA synthetase from yeast.
The interaction between phenylalanyl-tRNA synthetase from yeast and Escherichia coli and tRNAPhe (yeast), tRNASer (yeast), tRNA1Val (E. coli) has been investigated by ultracentrifugation analysis, fluorescence titrations and fast kinetic techniques. The fluorescence of the Y-base of tRNAPhe and the intrinsic fluorescence of the synthetases have been used as optical indicators. 1. Specific complexes between phenylalanyl-tRNA synthetase and tRNAPhe from yeast are formed in a two-step mechanism: a nearly diffusion-controlled recombination is followed by a fast conformational transition. Binding constants, rate constants and changes in the quantum yield of the Y-base fluorescence upon binding are given under a variety of conditions with respect to pH, added salt, concentration of Mg2+ ions and temperature. 2. Heterologous complexes between phenylalanyl-tRNA synthetase (E. coli) and tRNAPhe (yeast) are formed in a similar two-step mechanism as the specific complexes; the conformational transition, however, is slower by a factor 4-5. 3. Formation of non-specific complexes between phenylalanyl-tRNA synthetase (yeast) and tRNATyr (E. coli) proceeds in a one-step mechanism. Phenylalanyl-tRNA synthetase (yeast) binds either two molecules of tRNAPhe (yeast) or only one molecule of tRNATyr (E. coli); tRNA1Val (E. coli) or tRNASer (yeast) are also bound in a 1:1 stoichiometry. Binding constants for complexes of phenylalanyl-tRNA synthetase (yeast) and tRNATyr (E. coli) are determined under a variety of conditions. In contrast to specific complex formation, non-specific binding is disfavoured by the presence of Mg2+ ions, and is not affected by pH and the presence of pyrophosphate. The difference in the stabilities of specific and non-specific complexes can be varied by a factor of 2--100 depending on the ionic conditions. Discrimination of cognate and non-cognate tRNA by phenylalanyl-tRNA synthetase (yeast) is discussed in terms of the binding mechanism, the topology of the binding sites, the nature of interacting forces and the relation between specificity and ionic conditions.
Mechanism of discrimination between cognate and non-cognate tRNAs by phenylalanyl-tRNA synthetase from yeast. The interaction between phenylalanyl-tRNA synthetase from yeast and Escherichia coli and tRNAPhe (yeast), tRNASer (yeast), tRNA1Val (E. coli) has been investigated by ultracentrifugation analysis, fluorescence titrations and fast kinetic techniques. The fluorescence of the Y-base of tRNAPhe and the intrinsic fluorescence of the synthetases have been used as optical indicators. 1. Specific complexes between phenylalanyl-tRNA synthetase and tRNAPhe from yeast are formed in a two-step mechanism: a nearly diffusion-controlled recombination is followed by a fast conformational transition. Binding constants, rate constants and changes in the quantum yield of the Y-base fluorescence upon binding are given under a variety of conditions with respect to pH, added salt, concentration of Mg2+ ions and temperature. 2. Heterologous complexes between phenylalanyl-tRNA synthetase (E. coli) and tRNAPhe (yeast) are formed in a similar two-step mechanism as the specific complexes; the conformational transition, however, is slower by a factor 4-5. 3. Formation of non-specific complexes between phenylalanyl-tRNA synthetase (yeast) and tRNATyr (E. coli) proceeds in a one-step mechanism. Phenylalanyl-tRNA synthetase (yeast) binds either two molecules of tRNAPhe (yeast) or only one molecule of tRNATyr (E. coli); tRNA1Val (E. coli) or tRNASer (yeast) are also bound in a 1:1 stoichiometry. Binding constants for complexes of phenylalanyl-tRNA synthetase (yeast) and tRNATyr (E. coli) are determined under a variety of conditions. In contrast to specific complex formation, non-specific binding is disfavoured by the presence of Mg2+ ions, and is not affected by pH and the presence of pyrophosphate. The difference in the stabilities of specific and non-specific complexes can be varied by a factor of 2--100 depending on the ionic conditions. Discrimination of cognate and non-cognate tRNA by phenylalanyl-tRNA synthetase (yeast) is discussed in terms of the binding mechanism, the topology of the binding sites, the nature of interacting forces and the relation between specificity and ionic conditions.
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PMID:9289
Experimental infusion thrombophlebitis. Importance of the infusion rate.
The importance of the method of administration of acid glucose infusions for the venous inflammatory response has been investigated in two series of experimental trials. 60 ml of 5% glucose solution was administered into rabbit-ear veins in three ways: 1) continuously over 5 hours (slow infusion), 2) continuously over 1 hour (rapid infusion), 3) discontinuously during 2 X 30 minutes with an interval of 4 hours (discontinuous infusion). Microscopical examination of the veins revealed that the inflammatory changes were less pronounced after rapid and discontinuous infusions than after slow infusions.
Experimental infusion thrombophlebitis. Importance of the infusion rate. The importance of the method of administration of acid glucose infusions for the venous inflammatory response has been investigated in two series of experimental trials. 60 ml of 5% glucose solution was administered into rabbit-ear veins in three ways: 1) continuously over 5 hours (slow infusion), 2) continuously over 1 hour (rapid infusion), 3) discontinuously during 2 X 30 minutes with an interval of 4 hours (discontinuous infusion). Microscopical examination of the veins revealed that the inflammatory changes were less pronounced after rapid and discontinuous infusions than after slow infusions.
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PMID:9290
Experimental infusion thrombophlebitis. Importance of the pH of glucose solutions.
An experimental method is presented, which compares the tendency of different infusions to cause thrombophlebitis. It is based ona quantitative histological analysis of the inflammatory changes in the veins of rabbit ears after infusions under standardized conditions. By means of this method the inflammatory changes in the veins have been shown to be significantly less pronounced when the pH of glucose solutions is altered from 3.0 to 3.6. This pH change has been prescribed in the 1971 corrections to Pharmacopoea Nordica 1963. By complete neutralization of 5% glucose a further reduction of the damage to the veins has been obtained. For this purpose phosphate buffer is recommended.
Experimental infusion thrombophlebitis. Importance of the pH of glucose solutions. An experimental method is presented, which compares the tendency of different infusions to cause thrombophlebitis. It is based ona quantitative histological analysis of the inflammatory changes in the veins of rabbit ears after infusions under standardized conditions. By means of this method the inflammatory changes in the veins have been shown to be significantly less pronounced when the pH of glucose solutions is altered from 3.0 to 3.6. This pH change has been prescribed in the 1971 corrections to Pharmacopoea Nordica 1963. By complete neutralization of 5% glucose a further reduction of the damage to the veins has been obtained. For this purpose phosphate buffer is recommended.
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PMID:9291
Cardiovascular response to exercise under increasing doses of chlorthalidone.
Five male subjects with essential hypertension received chlorthalidone at each of four dose levels (25, 50, 100, and 200 mg/day) for eight week periods each preceded by an eight week placebo period. Dosage order was randomized and double-blind. During the last week of each active and placebo period an upright bicycle exercise study was carried out at three loads (100, 200, 300 kpm/min) for 6 min each. Oxygen consumption at the maximal workload was 42% of predicted at a heart rate of 170. During placebo therapy, increasing workloads were associated with a progressive increase in blood pressure, heart rate, and pressure-rate index (systolic pressure times heart rate). With increasing doses of chlorthalidone up to 100 mg/day, there was a progressive reduction in blood pressure and pressure-rate index. At 200 mg/day there were paradoxical increases in diastolic pressures, heart rates and pressure-rate indices above values observed at 100 mg/day. With increasing doses of chlorthalidone, there was a progressive increase in arterial blood CO2 content and pH. Increasing workloads were associated with increased arterial blood lactate and decreased arterial blood lactate and decreased arterial blood pH. The changes in lactate and pH were not different at the different dose levels. The best antihypertensive effect in these exercising subjects was observed at a daily dose of 100 mg of chlorthalidone. The exercise response was useful in the determination of potentially adverse hemodynamic consequences of the larger dose of chlorthalidone.
Cardiovascular response to exercise under increasing doses of chlorthalidone. Five male subjects with essential hypertension received chlorthalidone at each of four dose levels (25, 50, 100, and 200 mg/day) for eight week periods each preceded by an eight week placebo period. Dosage order was randomized and double-blind. During the last week of each active and placebo period an upright bicycle exercise study was carried out at three loads (100, 200, 300 kpm/min) for 6 min each. Oxygen consumption at the maximal workload was 42% of predicted at a heart rate of 170. During placebo therapy, increasing workloads were associated with a progressive increase in blood pressure, heart rate, and pressure-rate index (systolic pressure times heart rate). With increasing doses of chlorthalidone up to 100 mg/day, there was a progressive reduction in blood pressure and pressure-rate index. At 200 mg/day there were paradoxical increases in diastolic pressures, heart rates and pressure-rate indices above values observed at 100 mg/day. With increasing doses of chlorthalidone, there was a progressive increase in arterial blood CO2 content and pH. Increasing workloads were associated with increased arterial blood lactate and decreased arterial blood lactate and decreased arterial blood pH. The changes in lactate and pH were not different at the different dose levels. The best antihypertensive effect in these exercising subjects was observed at a daily dose of 100 mg of chlorthalidone. The exercise response was useful in the determination of potentially adverse hemodynamic consequences of the larger dose of chlorthalidone.
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PMID:9292
Pharmacokinetics and pharmacodynamics of alprenolol in the treatment of hypertension. I. Relationship between plasma concentration and adrenergic beta-receptor blockade.
Mean steady-state plasma concentrations of alprenolol were studied in relationship to the degree of beta-blockade, in sixteen patients receiving 600 mg daily in divided doses. Steady-state alprenolol concentrations were determined from the area under the plasma concentration-time curve during one eight-hour dosage interval after treatment for six weeks. Beta-blockade during alprenolol treatment was assessed from the chronotropic response to intravenous isoprenaline compared to the response after six weeks of placebo therapy. Although there was interindividual variability in the mean steady-state alprenolol concentration (range 11 - 141 ng/ml), and in the degree of beta-blockade (7-fold), the correlation between the two variables was highly significant (r = 0.80, p less than 0.001). The prescribed dose of alprenolol (mg/kg) was not significantly correlated with the plasma level of alprenolol or the beta-blockade. The chronotropic effects of isoprenaline during placebo and alprenolol were significantly interrelated (r = 0.79, p less than 0.001).
Pharmacokinetics and pharmacodynamics of alprenolol in the treatment of hypertension. I. Relationship between plasma concentration and adrenergic beta-receptor blockade. Mean steady-state plasma concentrations of alprenolol were studied in relationship to the degree of beta-blockade, in sixteen patients receiving 600 mg daily in divided doses. Steady-state alprenolol concentrations were determined from the area under the plasma concentration-time curve during one eight-hour dosage interval after treatment for six weeks. Beta-blockade during alprenolol treatment was assessed from the chronotropic response to intravenous isoprenaline compared to the response after six weeks of placebo therapy. Although there was interindividual variability in the mean steady-state alprenolol concentration (range 11 - 141 ng/ml), and in the degree of beta-blockade (7-fold), the correlation between the two variables was highly significant (r = 0.80, p less than 0.001). The prescribed dose of alprenolol (mg/kg) was not significantly correlated with the plasma level of alprenolol or the beta-blockade. The chronotropic effects of isoprenaline during placebo and alprenolol were significantly interrelated (r = 0.79, p less than 0.001).
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PMID:9293
The cardiovascular effects of etilefrine.
Intravenous etilefrine increases the pulse rate, cardiac output, stroke volume, central venous pressure and mean arterial pressure of healthy individuals. Peripheral vascular resistance falls during the infusion of 1-8 mg etilefrine but begins to rise at higher dosage. Marked falls in pulse rate, cardiac output, stroke volume and peripheral bloodflow, accompanied by rises in mean arterial pressure, occur when etilefrine is infused after administration of intravenous propranolol 2,5 mg. These findings indicate that etilefrine has both beta 1 and alpha adrenergic effects in man.
The cardiovascular effects of etilefrine. Intravenous etilefrine increases the pulse rate, cardiac output, stroke volume, central venous pressure and mean arterial pressure of healthy individuals. Peripheral vascular resistance falls during the infusion of 1-8 mg etilefrine but begins to rise at higher dosage. Marked falls in pulse rate, cardiac output, stroke volume and peripheral bloodflow, accompanied by rises in mean arterial pressure, occur when etilefrine is infused after administration of intravenous propranolol 2,5 mg. These findings indicate that etilefrine has both beta 1 and alpha adrenergic effects in man.
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PMID:9294
In vitro stability of proscillaridin A.
In an in vitro study, proscillardin A was found to be rapidly inactivated at low pH. More than 50 per cent of its activity, measured by 86Rb assay, was lost after incubation for 15 minutes at pH 1 and 37 degrees C. Compared with proscillaridin, the rate of inactivation of digoxin was lower in these experiments. The rapid inactivation of proscillaridin might be of clinical importance when treating patients with this glycoside.
In vitro stability of proscillaridin A. In an in vitro study, proscillardin A was found to be rapidly inactivated at low pH. More than 50 per cent of its activity, measured by 86Rb assay, was lost after incubation for 15 minutes at pH 1 and 37 degrees C. Compared with proscillaridin, the rate of inactivation of digoxin was lower in these experiments. The rapid inactivation of proscillaridin might be of clinical importance when treating patients with this glycoside.
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PMID:9295
Double-blind cross-over comparison of clenbuterol and salbutamol tablets in asthmatic out-patients.
A double-blind cross-over comparison of a new beta2-sympathomimetic bronchodilator, clenbuterol, with salbutamol and placebo has been made during a 24 day period of out-patient treatment of 19 adults with moderately severe asthma. Oral clenbuterol (10 mug 3 times a day) and salbutamol (4 mg 3 times a day) were equally and significantly (p less than 0.001) more effective than placebo, when daily records of peak expiratory flow or use of isoprenaline inhalations were the criteria of activity. Daily records of symptoms according to a questionnaire also suggested relief of the subjective effects of asthma during treatment with both active drugs (p less than 0.01).
Double-blind cross-over comparison of clenbuterol and salbutamol tablets in asthmatic out-patients. A double-blind cross-over comparison of a new beta2-sympathomimetic bronchodilator, clenbuterol, with salbutamol and placebo has been made during a 24 day period of out-patient treatment of 19 adults with moderately severe asthma. Oral clenbuterol (10 mug 3 times a day) and salbutamol (4 mg 3 times a day) were equally and significantly (p less than 0.001) more effective than placebo, when daily records of peak expiratory flow or use of isoprenaline inhalations were the criteria of activity. Daily records of symptoms according to a questionnaire also suggested relief of the subjective effects of asthma during treatment with both active drugs (p less than 0.01).
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-0.02419382520020008, 0.015730205923318863, 0.0062773567624390125, 0.1130438968539238, -0.10337590426206589, -0.050243180245161057, -0.027902957051992416, 0.037985555827617645, 0.0006704223924316466, -0.032538387924432755, -0.05184217542409897, -0.010297066532075405, 0.0868036076426506, 0.0228209737688303, 0.008677361533045769, 0.006634293589740992, -0.03554689139127731, -0.009752360172569752, -0.0588764064013958, -0.01277090422809124, 0.005422157235443592, 0.005166052374988794, 0.07592138648033142, 0.1029185801744461 ]
PMID:9296
Effects of dixyrazine and methaqualone on the sleep pattern in normal man.
Whole night EEG and polygraphic recordings were made in ten young, healthy, male volunteers after dixyrazine (12.5 mg, 25 mg, 50 mg), methaqualone (250 mg) and Isonox (methaqualone 250 mg + etodroxizine 50 mg). A total of 156 recording nights (36 adaptation nights were not included in the analyses) were scored for different sleep stages according to accepted criteria. The smallest dose of dixyrazine (12.5 mg) had no significant effect upon sleep pattern: the larger doses (25 mg and 50 mg) caused significant decreases in REM-sleep during the first nights of administration. The decrease disappeared during the following two nights of treatment. No withdrawal effects were seen. Methaqualone also caused moderate depression of REM-sleep during the first night of treatment, and this effect, too, disappeared during prolonged administration. Isonox (methaqualone + etodroxizine) had a somewhat stronger surpressive effect upon REM-sleep than methaqualone alone.
Effects of dixyrazine and methaqualone on the sleep pattern in normal man. Whole night EEG and polygraphic recordings were made in ten young, healthy, male volunteers after dixyrazine (12.5 mg, 25 mg, 50 mg), methaqualone (250 mg) and Isonox (methaqualone 250 mg + etodroxizine 50 mg). A total of 156 recording nights (36 adaptation nights were not included in the analyses) were scored for different sleep stages according to accepted criteria. The smallest dose of dixyrazine (12.5 mg) had no significant effect upon sleep pattern: the larger doses (25 mg and 50 mg) caused significant decreases in REM-sleep during the first nights of administration. The decrease disappeared during the following two nights of treatment. No withdrawal effects were seen. Methaqualone also caused moderate depression of REM-sleep during the first night of treatment, and this effect, too, disappeared during prolonged administration. Isonox (methaqualone + etodroxizine) had a somewhat stronger surpressive effect upon REM-sleep than methaqualone alone.
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PMID:9297
Evaluation of in vivo parameters of drug metabolizing enzyme activity in man after administration of clemastine, phenobarbital or placebo.
The 24 h urinary excretion of 6beta-hydroxycortisol and D-glucaric acid, the plasma half lives and total clearances of aminopyrine, and serum gamma-glutamyl-transpeptidase activity have been measured in nineteen healthy male volunteers. The study was done double blind and was conducted as a test of induction of microsomal drug metabolizing enzymes during and after daily doses of 6 mg clemastine, 300 mg phenobarbital or a placebo. The urinary excretion of 6beta-hydroxycortisol and D-glucaric acid was significantly increased in the phenobarbital group, the standard for induction. No changes were observed after treatment with clemastine or placebo. Phenobarbital also reduced the half life of aminopyrine, but it was not affected by clemastine or placebo. Gamma-glutamyl-transpeptidase activity increased only in the phenobarbital group. The elimination constant k2 of aminopyrine and the excretion of glucaric acid in the pre-medication period were correlated (p less than 0.05) The results indicate that the tests were of diagnostic value in determination of microsomal enzyme induction by phenobarbital. Failure to observe similar changes after treatment with clemastine imply failure of induction of this activity under the experimental conditions.
Evaluation of in vivo parameters of drug metabolizing enzyme activity in man after administration of clemastine, phenobarbital or placebo. The 24 h urinary excretion of 6beta-hydroxycortisol and D-glucaric acid, the plasma half lives and total clearances of aminopyrine, and serum gamma-glutamyl-transpeptidase activity have been measured in nineteen healthy male volunteers. The study was done double blind and was conducted as a test of induction of microsomal drug metabolizing enzymes during and after daily doses of 6 mg clemastine, 300 mg phenobarbital or a placebo. The urinary excretion of 6beta-hydroxycortisol and D-glucaric acid was significantly increased in the phenobarbital group, the standard for induction. No changes were observed after treatment with clemastine or placebo. Phenobarbital also reduced the half life of aminopyrine, but it was not affected by clemastine or placebo. Gamma-glutamyl-transpeptidase activity increased only in the phenobarbital group. The elimination constant k2 of aminopyrine and the excretion of glucaric acid in the pre-medication period were correlated (p less than 0.05) The results indicate that the tests were of diagnostic value in determination of microsomal enzyme induction by phenobarbital. Failure to observe similar changes after treatment with clemastine imply failure of induction of this activity under the experimental conditions.
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PMID:9298
Long term treatment of moderate hypertension with penbutolol (Hoe 893d). I. Effects on blood pressure, pulse rate, catecholamines in blood and urine, plasma renin activity and urinary aldosterone under basal conditions and following exercise.
The effects of penbutolol (Hoe 893 d), a new non-selective beta-receptor blocking agent, were studied in 5 patients with moderate hypertension. Initially, it was shown that 2-4 mg given orally once or twice daily tended to lower blood pressure and pulse rate, both at rest and following submaximal work. In prolonged trials (3-8 months) 4-60 mg/day were required to produce an acceptable antihypertensive effect. Penbutolol had no effect on the normal increase in plasma noradrenaline and adrenaline on standing, nor did it alter basal urinary catecholamine excretion. Submaximal work caused no significant change in plasma catecholamines before treatment, but there was a marked rise both in plasma noradrenaline and adrenaline during treatment with penbutolol. In short term studies there was a fall in plasma renin by 4 hours after oral administration of penbutolol 2-4 mg, which persisted for 24 hours. Prolonged treatment with penbutolol 20-30 mg twice daily inhibited renin production under basal conditions and following submaximal work, as well as lowered basal urinary aldosterone excretion. In one patient slight asthmatic symptoms appeared after treatment for 3 months with penbutolol. In other respects penbutolol was well tolerated.
Long term treatment of moderate hypertension with penbutolol (Hoe 893d). I. Effects on blood pressure, pulse rate, catecholamines in blood and urine, plasma renin activity and urinary aldosterone under basal conditions and following exercise. The effects of penbutolol (Hoe 893 d), a new non-selective beta-receptor blocking agent, were studied in 5 patients with moderate hypertension. Initially, it was shown that 2-4 mg given orally once or twice daily tended to lower blood pressure and pulse rate, both at rest and following submaximal work. In prolonged trials (3-8 months) 4-60 mg/day were required to produce an acceptable antihypertensive effect. Penbutolol had no effect on the normal increase in plasma noradrenaline and adrenaline on standing, nor did it alter basal urinary catecholamine excretion. Submaximal work caused no significant change in plasma catecholamines before treatment, but there was a marked rise both in plasma noradrenaline and adrenaline during treatment with penbutolol. In short term studies there was a fall in plasma renin by 4 hours after oral administration of penbutolol 2-4 mg, which persisted for 24 hours. Prolonged treatment with penbutolol 20-30 mg twice daily inhibited renin production under basal conditions and following submaximal work, as well as lowered basal urinary aldosterone excretion. In one patient slight asthmatic symptoms appeared after treatment for 3 months with penbutolol. In other respects penbutolol was well tolerated.
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PMID:9299
Pharmacokinetics and relative bioavailability of heptabarbital and heptabarbital sodium after oral administration to man.
A method has been developed for the quantitative determination of heptabarbital [5-(1-cyclohepten-1-yl)-5-ethylbarbituric acid] in human plasma after administration of single therapeutic doses of the drug. It involves a single extraction step followed by gas chromatography with alkali flame ionization detection, and the results were linear in the concentration range 0.125 - 5.0 mug/ml plasma. The pharmacokinetics and relative bioavailability of heptabarbital and heptabarbital sodium were studied in a crossover design in 7 healthy volunteers after oral administration of 20 tablets containing 200 mg heptabarbital and hard gelatine capsules containing an equivalent amount of its sodium salt. Heptabarbital concentrations in plasma were determined at regular intervals. The absorption of heptabarbital from the tablets absorbed more rapidly and peak concentrations occurred between 1/3 and 2 h. In all cases the elimination of heptabarbital could be described by a single first-order process with an average half-life of 7.6 h (range 6.1 - 11.2 h). The half-life of the drug in each individual was about the same in the two trials. The relative bioavailability in each volunteer was estimated by comparing the areas under the plasma concentration curves. The sodium salt had an average bioavailability of 83% relative to the free acid. In some volunteers urinary excretion of unchanged heptabarbital was measured; cumulative excretion amounted to 0.16 - 0.30% of the administered dose. Four volunteers received one tablet each night for eight or ten days, but no accumulation was found. In three volunteers the half-life of the drug prior to and after these experiments did not change, whereas in the other volunteer the half-life decreased from 7.1 to 4.6 h. The possibility of enzyme induction should be considered when heptabarbital is taken regularly. It was concluded that heptabarbital was a suitable drug for the treatment of insomnia, since its half-life was rather short. Heptabarbital sodium may be used for induction of sleep, whereas Medomin tablets, i.e. heptabarbital free acid, may be prescribed when the maintenance of sleep is the primary reason for treatment with a hypnotic drug.
Pharmacokinetics and relative bioavailability of heptabarbital and heptabarbital sodium after oral administration to man. A method has been developed for the quantitative determination of heptabarbital [5-(1-cyclohepten-1-yl)-5-ethylbarbituric acid] in human plasma after administration of single therapeutic doses of the drug. It involves a single extraction step followed by gas chromatography with alkali flame ionization detection, and the results were linear in the concentration range 0.125 - 5.0 mug/ml plasma. The pharmacokinetics and relative bioavailability of heptabarbital and heptabarbital sodium were studied in a crossover design in 7 healthy volunteers after oral administration of 20 tablets containing 200 mg heptabarbital and hard gelatine capsules containing an equivalent amount of its sodium salt. Heptabarbital concentrations in plasma were determined at regular intervals. The absorption of heptabarbital from the tablets absorbed more rapidly and peak concentrations occurred between 1/3 and 2 h. In all cases the elimination of heptabarbital could be described by a single first-order process with an average half-life of 7.6 h (range 6.1 - 11.2 h). The half-life of the drug in each individual was about the same in the two trials. The relative bioavailability in each volunteer was estimated by comparing the areas under the plasma concentration curves. The sodium salt had an average bioavailability of 83% relative to the free acid. In some volunteers urinary excretion of unchanged heptabarbital was measured; cumulative excretion amounted to 0.16 - 0.30% of the administered dose. Four volunteers received one tablet each night for eight or ten days, but no accumulation was found. In three volunteers the half-life of the drug prior to and after these experiments did not change, whereas in the other volunteer the half-life decreased from 7.1 to 4.6 h. The possibility of enzyme induction should be considered when heptabarbital is taken regularly. It was concluded that heptabarbital was a suitable drug for the treatment of insomnia, since its half-life was rather short. Heptabarbital sodium may be used for induction of sleep, whereas Medomin tablets, i.e. heptabarbital free acid, may be prescribed when the maintenance of sleep is the primary reason for treatment with a hypnotic drug.
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PMID:9300
The physiological disposition of etilefrine in man.
Pharmacokinetic and metabolic studies with 3H-etilefrine were performed to assess the importance of a first-pass effect on the pharmacodynamic action of this sympathomimetic amine. Identical amounts of 3H-activity, ca. 80% of the dose, were excreted in the urine after intravenous or oral administration, which indicates complete enteral absorption of the drug. Comparison of the areas under the plasma curves of unchanged etilefrine after both routes of administration resulted in a bioavailability factor of 0.55, which can be explained by an extensive first-pass effect. The time curve of plasma levels of etilefrine was compatible with an open 2-compartment model characterized by a rather large volume of distribution (Vd, beta) of 160 1, and a predominant half life of 2 hours. The pharmacodynamic action corresponded to the amount of drug in the central compartment. The major pathway of metabolism of etilefrine was conjugation to form the phenolic sulphate, and a very minor proportion of the drug was excreted as the corresponding hydroxymandelic acid. This metabolic pattern seems to confirm our hypothesis that phenylalkylamines with hydroxyl group in the m-position of the benzene ring are predominantly conjugated in contrast to p-hydroxylated compounds which are mainly deaminated.
The physiological disposition of etilefrine in man. Pharmacokinetic and metabolic studies with 3H-etilefrine were performed to assess the importance of a first-pass effect on the pharmacodynamic action of this sympathomimetic amine. Identical amounts of 3H-activity, ca. 80% of the dose, were excreted in the urine after intravenous or oral administration, which indicates complete enteral absorption of the drug. Comparison of the areas under the plasma curves of unchanged etilefrine after both routes of administration resulted in a bioavailability factor of 0.55, which can be explained by an extensive first-pass effect. The time curve of plasma levels of etilefrine was compatible with an open 2-compartment model characterized by a rather large volume of distribution (Vd, beta) of 160 1, and a predominant half life of 2 hours. The pharmacodynamic action corresponded to the amount of drug in the central compartment. The major pathway of metabolism of etilefrine was conjugation to form the phenolic sulphate, and a very minor proportion of the drug was excreted as the corresponding hydroxymandelic acid. This metabolic pattern seems to confirm our hypothesis that phenylalkylamines with hydroxyl group in the m-position of the benzene ring are predominantly conjugated in contrast to p-hydroxylated compounds which are mainly deaminated.
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PMID:9301
Long term treatment of moderate hypertension with penbutolol (Hoe 893d). II. Effect on the response of plasma catecholamines and plasma renin activity to insulin-induced hypoglycemia.
The effect of insulin-induced hypoglycemia on the blood levels of catecholamines and renin activity has been studied in five patients with moderate hypertension before and after treatment for 3 - 8 months with penbutolol (PEN) 20 - 30 mg twice daily. Penbutolol caused no change in fasting blood glucose level. Insulin o.1 IU per kg body weight i.v. reduced blood glucose concentration by approximately 50 per cent after 30 - 45 min, both before and during treatment with penbutolol. Hypoglycemia prior to medication was accompanied by a marked increase in the production of adrenaline and a minor increase of noradrenaline in all five patients. During treatment the response of adrenaline to hypoglycemia was reduced in four patients and the data was inconclusive in one. Basal renin activity was rather low in three patients, within the normal range in one and relatively high in one. Before penbutolol the hypoglycemia-induced increase in catecholamine production caused no change in plasma renin activity in the three patients with low basal levels, whereas a marked increase was observed in the other two. During medication plasma renin activity remained unchanged on induction of hypoglycemia regardless of the catecholamine response. Despite the marked increase in plasma adrenaline following insulin-induced hypoglycemia, no statistically significant increase in pulse rate was recorded.
Long term treatment of moderate hypertension with penbutolol (Hoe 893d). II. Effect on the response of plasma catecholamines and plasma renin activity to insulin-induced hypoglycemia. The effect of insulin-induced hypoglycemia on the blood levels of catecholamines and renin activity has been studied in five patients with moderate hypertension before and after treatment for 3 - 8 months with penbutolol (PEN) 20 - 30 mg twice daily. Penbutolol caused no change in fasting blood glucose level. Insulin o.1 IU per kg body weight i.v. reduced blood glucose concentration by approximately 50 per cent after 30 - 45 min, both before and during treatment with penbutolol. Hypoglycemia prior to medication was accompanied by a marked increase in the production of adrenaline and a minor increase of noradrenaline in all five patients. During treatment the response of adrenaline to hypoglycemia was reduced in four patients and the data was inconclusive in one. Basal renin activity was rather low in three patients, within the normal range in one and relatively high in one. Before penbutolol the hypoglycemia-induced increase in catecholamine production caused no change in plasma renin activity in the three patients with low basal levels, whereas a marked increase was observed in the other two. During medication plasma renin activity remained unchanged on induction of hypoglycemia regardless of the catecholamine response. Despite the marked increase in plasma adrenaline following insulin-induced hypoglycemia, no statistically significant increase in pulse rate was recorded.
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PMID:9302
Gastrointestinal absorption and metabolism of two 35S-labelled ampicillin esters.
Two ampicillin esters, 35S-pivampicillin and 35S-carampicillin and polyethylene glycol (nonabsorbable marker) were given orally to healthy subjects with gastrointestinal tubes. The cumulative absorption of radioactivity in both compounds (60-90%) was higher than (25-67%) previously found after administration of 35S-ampicillin. The pek plasma levels of radioactivity were reached earlier and were about twice as high as in the latter study. The amount of radioactivity excreted in urine was about the same as that absorbed from the proximal part of the gastrointestinal tract. Both 35S-pivampicillin and 35S-carampicillin were partly hydrolyzed in the stomach and upper small intestine and labelled ampicillin was released. They were also decomposed after absorption since all the radioactivity recovered from blood and urine appeared to be attached to ampicillin and ampicillin metabolites. Studies in vitro indicated that ampicillin esters absorbed intact may be hydrolyzed not only in the blood but also in the intestinal wall and the liver.
Gastrointestinal absorption and metabolism of two 35S-labelled ampicillin esters. Two ampicillin esters, 35S-pivampicillin and 35S-carampicillin and polyethylene glycol (nonabsorbable marker) were given orally to healthy subjects with gastrointestinal tubes. The cumulative absorption of radioactivity in both compounds (60-90%) was higher than (25-67%) previously found after administration of 35S-ampicillin. The pek plasma levels of radioactivity were reached earlier and were about twice as high as in the latter study. The amount of radioactivity excreted in urine was about the same as that absorbed from the proximal part of the gastrointestinal tract. Both 35S-pivampicillin and 35S-carampicillin were partly hydrolyzed in the stomach and upper small intestine and labelled ampicillin was released. They were also decomposed after absorption since all the radioactivity recovered from blood and urine appeared to be attached to ampicillin and ampicillin metabolites. Studies in vitro indicated that ampicillin esters absorbed intact may be hydrolyzed not only in the blood but also in the intestinal wall and the liver.
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PMID:9303
Brain homovanillic acid: regional changes over time with antipsychotic drugs.
Acute administration of equivalent doses of either chlorpromazine, thioridazine, or clozapine, respectively, produced progressively smaller increases in brain homovanillic acid (HVA) in the rabbit; however, changes in HVA in three brain regions were of equal magnitude for a single dose of a given drug. Chronic administration of fluphenazine enanthate resulted in a decrease in HVA relative to acute treatment in caudate more than limbic regions. No differences between caudate and limbic regions were observed during daily chlorpromazine administration for 3 ro 8 days. Tolerance appeared to develop in approximately 1 week. Chronic treatment with clozapine produced no tolerance at one week but suggestive evidence of tolerance in caudate and limbic regions at two weeks. No tolerance was observed in the hypothalamus during chronic treatment with any drug used. Cisternal CSF HVA paralleled caudate HVA during acute and chronic treatments.
Brain homovanillic acid: regional changes over time with antipsychotic drugs. Acute administration of equivalent doses of either chlorpromazine, thioridazine, or clozapine, respectively, produced progressively smaller increases in brain homovanillic acid (HVA) in the rabbit; however, changes in HVA in three brain regions were of equal magnitude for a single dose of a given drug. Chronic administration of fluphenazine enanthate resulted in a decrease in HVA relative to acute treatment in caudate more than limbic regions. No differences between caudate and limbic regions were observed during daily chlorpromazine administration for 3 ro 8 days. Tolerance appeared to develop in approximately 1 week. Chronic treatment with clozapine produced no tolerance at one week but suggestive evidence of tolerance in caudate and limbic regions at two weeks. No tolerance was observed in the hypothalamus during chronic treatment with any drug used. Cisternal CSF HVA paralleled caudate HVA during acute and chronic treatments.
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PMID:9309
Hypoxia in fibroblast cultures. I. Changes in glucose consumption by 5 vol.-% oxygen concentration and reduced pH.
In secondary cultures of rat embryonic fibroblasts the glucose consumption and lactate concentration were comparatively investigated in 5 and 21 Vol.-% O2 environment at pH 6.6 and pH 7.4 (HEPES-buffer). The results were correlated with cell density. The following observations were made: 1. At pH 6.6 the rate of cell proliferation was reduced to 81%; by additional hypoxia it was reduced to 71%. 2. Increase in cell density effectuated decrease of glucose consumption and lactate production at pH 7.4 and pH 6.6 in 5% as well as in 21% O2 environment. 3. At pH 7.4 enhancement of glucose consumption and lactate production due to hypoxia can be observed only at low cell density. 4. At pH 6.6 respiration of fibroblasts was little influenced by 5% O2 environment. 5. Transition from pH 7.4/21% O2 to pH 6.6/5% O2 effectuated decrease in glucose consumption and lactate concentration in tissues in hypoxic environment. This suggests a pH-governed feedback mechanism. Abbreviations used in the text: c-AMP = cyclic adenosine monophosphate; MPS = acid mucopolysaccharides (glycosaminoglycans).
Hypoxia in fibroblast cultures. I. Changes in glucose consumption by 5 vol.-% oxygen concentration and reduced pH. In secondary cultures of rat embryonic fibroblasts the glucose consumption and lactate concentration were comparatively investigated in 5 and 21 Vol.-% O2 environment at pH 6.6 and pH 7.4 (HEPES-buffer). The results were correlated with cell density. The following observations were made: 1. At pH 6.6 the rate of cell proliferation was reduced to 81%; by additional hypoxia it was reduced to 71%. 2. Increase in cell density effectuated decrease of glucose consumption and lactate production at pH 7.4 and pH 6.6 in 5% as well as in 21% O2 environment. 3. At pH 7.4 enhancement of glucose consumption and lactate production due to hypoxia can be observed only at low cell density. 4. At pH 6.6 respiration of fibroblasts was little influenced by 5% O2 environment. 5. Transition from pH 7.4/21% O2 to pH 6.6/5% O2 effectuated decrease in glucose consumption and lactate concentration in tissues in hypoxic environment. This suggests a pH-governed feedback mechanism. Abbreviations used in the text: c-AMP = cyclic adenosine monophosphate; MPS = acid mucopolysaccharides (glycosaminoglycans).
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PMID:9310
Hypoxia in fibroblast cultures. 2. Influence of pH on the distribution pattern of acid mucopolysaccharides.
Secondary cultures of embryonic rat fibroblasts [NEUPERT et al., Exp. Path. 7, 19-28 (1972)] were cultured in 21% and 5% O2 concentration at pH 6.6 and 7.4 for 6 or 8 days. The acid mucopolysaccharides were isolated and fractionated by alcohol precipitation, papain digestion, CPC-precipitation and fractionation after the microtechniques of SVEJCAR and ROBERTSON [see KITTLICK and NEUPERT, Exp. Path. 7, 7-18 (1972)]. Cells and medium were investigated together. The results were related to cell density and compared with the glucose and lactate values [see KITTLICK and NEUPERT, Exp. Path. 10, 109-114 (1975)]. Concerning the question of interrelations of MPS-synthesis and glycolysis a survey on literature is given. Our own test results were as follows: 1. Hypoxia (5% O2) did not influence MPS-total synthesis. 2. Depending on cell density the individual MPS fractions were different in their reaction to hypoxia. 3. Hyaluronic acid (and heparan sulphate) in the MPS-pattern showed other behaviour than chondroitin sulphate and dermatan sulphate, respectively. 4. At low cell density hypoxia effectuated increase in hyaluronic acid and decrease in chondroitin sulphate and dermatan sulphate, respectively. 5. At high cell density hypoxia effectuated decrease in hyaluronic acid and increase in chondroitin sulphate and dermatan sulphate, respectively. Possible relationship to processes in the tissue is discussed.
Hypoxia in fibroblast cultures. 2. Influence of pH on the distribution pattern of acid mucopolysaccharides. Secondary cultures of embryonic rat fibroblasts [NEUPERT et al., Exp. Path. 7, 19-28 (1972)] were cultured in 21% and 5% O2 concentration at pH 6.6 and 7.4 for 6 or 8 days. The acid mucopolysaccharides were isolated and fractionated by alcohol precipitation, papain digestion, CPC-precipitation and fractionation after the microtechniques of SVEJCAR and ROBERTSON [see KITTLICK and NEUPERT, Exp. Path. 7, 7-18 (1972)]. Cells and medium were investigated together. The results were related to cell density and compared with the glucose and lactate values [see KITTLICK and NEUPERT, Exp. Path. 10, 109-114 (1975)]. Concerning the question of interrelations of MPS-synthesis and glycolysis a survey on literature is given. Our own test results were as follows: 1. Hypoxia (5% O2) did not influence MPS-total synthesis. 2. Depending on cell density the individual MPS fractions were different in their reaction to hypoxia. 3. Hyaluronic acid (and heparan sulphate) in the MPS-pattern showed other behaviour than chondroitin sulphate and dermatan sulphate, respectively. 4. At low cell density hypoxia effectuated increase in hyaluronic acid and decrease in chondroitin sulphate and dermatan sulphate, respectively. 5. At high cell density hypoxia effectuated decrease in hyaluronic acid and increase in chondroitin sulphate and dermatan sulphate, respectively. Possible relationship to processes in the tissue is discussed.
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PMID:9311
The extracellular protease from Pseudomonas fluorescens.
An extracellular protease has been purified from cultures of Pseudomonas fluorescens. It is a metalloenzyme with a molecular weight of 37,000 +/- 3,700, able to digest casein, hemoglobin and gelatine.
The extracellular protease from Pseudomonas fluorescens. An extracellular protease has been purified from cultures of Pseudomonas fluorescens. It is a metalloenzyme with a molecular weight of 37,000 +/- 3,700, able to digest casein, hemoglobin and gelatine.
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PMID:9312
Anionic activation of human salivary amylase.
In all earlier studies on alpha-amylase, the influence of different ions were studied in phosphate buffer. The present report shows the effect of different ions individually with Tris and amino acid. Though it has been claimed recently that sodium ion is an activator of alpha-amylase, this study reconfirms that sodium ion does not activate human salivary amylase.
Anionic activation of human salivary amylase. In all earlier studies on alpha-amylase, the influence of different ions were studied in phosphate buffer. The present report shows the effect of different ions individually with Tris and amino acid. Though it has been claimed recently that sodium ion is an activator of alpha-amylase, this study reconfirms that sodium ion does not activate human salivary amylase.
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PMID:9313
Effect of benzimidazole on nicotinamide adenine dinucleotide phosphate phosphomonoesterase activity in wheat leaves.
Nicotinamide adenine dinucleotide phosphate phosphomonoesterase was isolated and partially purified from wheat (Triticum aestivum L. var. Selkirk) leaves. The enzyme had KNADP value of 1.4 X 10(-4) M and a pH optimum of 5.9. In vitro activity of this enzyme was unaffected by precursors of NAD (nicotinamide and nicotinic acid) or cytokinins (kinetin and benzimidazole). However, when detached wheat leaves were treated with solutions of these compounds, the precursors lowered the specific activity while the cytokinins enhanced the activity. It is suggested that spatial separation and compartmentation of the enzyme and its substrate NADP account for the similar effect of benzimidazole on both.
Effect of benzimidazole on nicotinamide adenine dinucleotide phosphate phosphomonoesterase activity in wheat leaves. Nicotinamide adenine dinucleotide phosphate phosphomonoesterase was isolated and partially purified from wheat (Triticum aestivum L. var. Selkirk) leaves. The enzyme had KNADP value of 1.4 X 10(-4) M and a pH optimum of 5.9. In vitro activity of this enzyme was unaffected by precursors of NAD (nicotinamide and nicotinic acid) or cytokinins (kinetin and benzimidazole). However, when detached wheat leaves were treated with solutions of these compounds, the precursors lowered the specific activity while the cytokinins enhanced the activity. It is suggested that spatial separation and compartmentation of the enzyme and its substrate NADP account for the similar effect of benzimidazole on both.
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PMID:9314
Gastric mucus effusion elicited by oral copper compounds: potential anti-ulcer activity.
In rats, both Cu(I) and Cu(II) show an irritancy profile not shared with Cu degrees or Zn(II) or Ni(II). The gastric response to Cu(II), i.e. copius fluid and mucus secretion, can protect the stomach from the acute ulcerative effects of aspirin or physical stress administered subsequently.
Gastric mucus effusion elicited by oral copper compounds: potential anti-ulcer activity. In rats, both Cu(I) and Cu(II) show an irritancy profile not shared with Cu degrees or Zn(II) or Ni(II). The gastric response to Cu(II), i.e. copius fluid and mucus secretion, can protect the stomach from the acute ulcerative effects of aspirin or physical stress administered subsequently.
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PMID:9318
The effect of ion-exchange column chromatography on separation of X and Y chromosome-bearing human spermatozoa.
Separation of X and Y chromosome-bearing spermatozoa has been attempted using ion-exchange column chromatography, with cation- and anion-exchange resins of low, intermediate, and high ionic strength. Examination of F-bodies on the Y chromosome of treated human sperm and progeny resulting from insemination of treated rabbit spermatozoa indicates that in none of the cases investigated did the treatment cause a separation of X and Y chromosome-bearing spermatozoa. The treatment does appear to filter out dead rabbit (and bull) spermatozoa, but the possible beneficial effects of this phenomenon are as yet uninvestigated.
The effect of ion-exchange column chromatography on separation of X and Y chromosome-bearing human spermatozoa. Separation of X and Y chromosome-bearing spermatozoa has been attempted using ion-exchange column chromatography, with cation- and anion-exchange resins of low, intermediate, and high ionic strength. Examination of F-bodies on the Y chromosome of treated human sperm and progeny resulting from insemination of treated rabbit spermatozoa indicates that in none of the cases investigated did the treatment cause a separation of X and Y chromosome-bearing spermatozoa. The treatment does appear to filter out dead rabbit (and bull) spermatozoa, but the possible beneficial effects of this phenomenon are as yet uninvestigated.
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PMID:9319
Equality in survival of X and Y chromosome-bearing human spermatozoa.
Human X and Y chromosome-bearing spermatozoa survived equally well during washing and resuspension in buffers of pH 5.2 and 8.0 and during incubation in these buffers for 11 hours at 37 degrees C. This suggests that alteration of the ratio of living X- and Y-bearing spermatozoa by direct treatment is not an effective method of sex ratio alteration.
Equality in survival of X and Y chromosome-bearing human spermatozoa. Human X and Y chromosome-bearing spermatozoa survived equally well during washing and resuspension in buffers of pH 5.2 and 8.0 and during incubation in these buffers for 11 hours at 37 degrees C. This suggests that alteration of the ratio of living X- and Y-bearing spermatozoa by direct treatment is not an effective method of sex ratio alteration.
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PMID:9320
Accumulation of nicotine in the uterine fluid of the six-day pregnant rabbit.
In 6-day pregnant New Zealand White rabbits dosed intravenously with 3H-nicotine, the 3H-activity in the uterine fluid was approximately 5 to 11 times greater than that in the plasma at the corresponding times; 3H-nicotine itself accounted for most of this radioactivity. Dichlorodiphenyltrichloroethane (DDT) also accumulated in the uterine luminal fluid of 6-day pregnant rabbits, but to a lesser extent. However, nicotine or DDT accumulation did not occur in similarly treated, nonpregnant rabbits. The radioactivity in the uterine fluid of rabbits treated with 14C-isoniazid, salicylic acid, barbital, antipyrine, and caffeine was not different from that in the plasma (uterine fluid to plasma radioactivity ratios ranged between 0.67 and 1.85) in both 6-day pregnant and nonpregnant rabbits. No differences in regard to nicotine metabolism, volume of distribution, plasma disappearance, plasma protein binding, or urinary excretion were found between 6-day pregnant and nonpregnant rabbits. Accumulation of nicotine took place in the uterine luminal fluid of nonpregnant does pretreated with either progesterone or human chorionic gonadotropin, but did not occur in does pretreated with estrogen. It is possible that the accumulation of nicotine in uterine fluid of pregnant does and in human chorionic gonadotropin- or progesterone-pretreated nonpregnant does is due to the binding of nicotine to specific uterine fluid proteins.
Accumulation of nicotine in the uterine fluid of the six-day pregnant rabbit. In 6-day pregnant New Zealand White rabbits dosed intravenously with 3H-nicotine, the 3H-activity in the uterine fluid was approximately 5 to 11 times greater than that in the plasma at the corresponding times; 3H-nicotine itself accounted for most of this radioactivity. Dichlorodiphenyltrichloroethane (DDT) also accumulated in the uterine luminal fluid of 6-day pregnant rabbits, but to a lesser extent. However, nicotine or DDT accumulation did not occur in similarly treated, nonpregnant rabbits. The radioactivity in the uterine fluid of rabbits treated with 14C-isoniazid, salicylic acid, barbital, antipyrine, and caffeine was not different from that in the plasma (uterine fluid to plasma radioactivity ratios ranged between 0.67 and 1.85) in both 6-day pregnant and nonpregnant rabbits. No differences in regard to nicotine metabolism, volume of distribution, plasma disappearance, plasma protein binding, or urinary excretion were found between 6-day pregnant and nonpregnant rabbits. Accumulation of nicotine took place in the uterine luminal fluid of nonpregnant does pretreated with either progesterone or human chorionic gonadotropin, but did not occur in does pretreated with estrogen. It is possible that the accumulation of nicotine in uterine fluid of pregnant does and in human chorionic gonadotropin- or progesterone-pretreated nonpregnant does is due to the binding of nicotine to specific uterine fluid proteins.
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PMID:9322
Oxygen transport impairment in diabetes.
Oxyhemoglobin dissociation curves (ODC) from zero to full saturation were developed from tests performed on whole blood from various groups of diabetic and nondiabetic healthy subjects. P50 at in-vivo pH was slightly but significantly lower than normal in ambulatory nonacidotic, uncomplicated juvenile diabetics (26.0 vs. 27.3 mm. Hg, P less than 0.001), despite increased red cell 2,3-diphosphoglycerate (2,3-DPG) concentrations in diabetic erythrocytes (15.0 vs. 13.7 mumole/gm. Hb, P less than 0.001). This combination of changes is in keeping with the presence of increased proportions of hemoglobin AIc in insulin-treated diabetics. The position of the ODC was positively correlated with the 2,3-DPG concentration (P less than 0.01), which varied in response to fluctuations in plasma concentration of inorganic phosphate (Pi) (P less than 0.001). Optimal metabolic control may lead to a normalization of the ODC in association with increased concentrations of red cell 2,3-DPG and P. When the diabetes was uncontrolled, the ODC was usually unchanged during the acidotic phase because the lowered pH balanced the effect of diminished 2,3-DPG concentration on the ODC. After correction of acidosis, the disproportion between erythrocyte 2,3-DPG and pH became quite prominent, accompanied by a corresponding fall in P50 (21.0 vs. 26.1 mm. Hg, P less than 0.001). Following ketoacidosis, with a persistently lowered Pi, it may take up to one week for 2,3-DPG to return to an approximately normal level, and the P50 will be impaired for the same period. A diphosphonate (EHDP) known to enhance tubular phosphate reabsorption in man was given to nonacidotic insulin-treated diabetic and healthy volunteers for 28 days. It caused a significant increase in mean Pi and P50 in both healthy and diabetic subjects (r = 0.58, P less than 0.01). When a dietary supplement of dibasic calcium phosphate was given to diabetic subjects for 28 days, a significant increase in P50 also occurred (25.2 vs. 27.2 mm. Hg, P less than 0.001). It is recommended that the diabetes diet be supplemented by dibasic calcium phosphate to prevent the inhibitory effect of a low concentration of Pi on red cell oxygen delivery.
Oxygen transport impairment in diabetes. Oxyhemoglobin dissociation curves (ODC) from zero to full saturation were developed from tests performed on whole blood from various groups of diabetic and nondiabetic healthy subjects. P50 at in-vivo pH was slightly but significantly lower than normal in ambulatory nonacidotic, uncomplicated juvenile diabetics (26.0 vs. 27.3 mm. Hg, P less than 0.001), despite increased red cell 2,3-diphosphoglycerate (2,3-DPG) concentrations in diabetic erythrocytes (15.0 vs. 13.7 mumole/gm. Hb, P less than 0.001). This combination of changes is in keeping with the presence of increased proportions of hemoglobin AIc in insulin-treated diabetics. The position of the ODC was positively correlated with the 2,3-DPG concentration (P less than 0.01), which varied in response to fluctuations in plasma concentration of inorganic phosphate (Pi) (P less than 0.001). Optimal metabolic control may lead to a normalization of the ODC in association with increased concentrations of red cell 2,3-DPG and P. When the diabetes was uncontrolled, the ODC was usually unchanged during the acidotic phase because the lowered pH balanced the effect of diminished 2,3-DPG concentration on the ODC. After correction of acidosis, the disproportion between erythrocyte 2,3-DPG and pH became quite prominent, accompanied by a corresponding fall in P50 (21.0 vs. 26.1 mm. Hg, P less than 0.001). Following ketoacidosis, with a persistently lowered Pi, it may take up to one week for 2,3-DPG to return to an approximately normal level, and the P50 will be impaired for the same period. A diphosphonate (EHDP) known to enhance tubular phosphate reabsorption in man was given to nonacidotic insulin-treated diabetic and healthy volunteers for 28 days. It caused a significant increase in mean Pi and P50 in both healthy and diabetic subjects (r = 0.58, P less than 0.01). When a dietary supplement of dibasic calcium phosphate was given to diabetic subjects for 28 days, a significant increase in P50 also occurred (25.2 vs. 27.2 mm. Hg, P less than 0.001). It is recommended that the diabetes diet be supplemented by dibasic calcium phosphate to prevent the inhibitory effect of a low concentration of Pi on red cell oxygen delivery.
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PMID:9323
Increased microvascular permeability to plasma proteins in short- and long-term juvenile diabetics.
The present findings of increased microvascular protein passage are compatible with the hypothesis that the organic, histologically demonstrated diabetic microangiopathy is a long-term effect of periods of increased extravasation of plasma proteins, with subsequent protein deposition in the microvascular wall, i.e., the concept of plasmatic vasculosis. Arterial hypertension, frequently present in diabetes, enhances the development of arteriolar hyalinosis. Effective treatment of diabetes and hypertension arrests development of the microvascular lesions.
Increased microvascular permeability to plasma proteins in short- and long-term juvenile diabetics. The present findings of increased microvascular protein passage are compatible with the hypothesis that the organic, histologically demonstrated diabetic microangiopathy is a long-term effect of periods of increased extravasation of plasma proteins, with subsequent protein deposition in the microvascular wall, i.e., the concept of plasmatic vasculosis. Arterial hypertension, frequently present in diabetes, enhances the development of arteriolar hyalinosis. Effective treatment of diabetes and hypertension arrests development of the microvascular lesions.
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PMID:9324
Muscle metabolism during rest and exercise: influence on the oxygen transport system of blood in normal and diabetic subjects.
The oxygen dissociation curve shifted less to the right in venous blood draining from muscle in eight insulin-deficient diabetics working at a constant submaximal workload than in seven normal controls (28.7 mm. Hg vs. 30.8 mm Hg; P less than 0.05). This diminution of the in-vivo Bohr effect at the muscle tissue level during exercise in diabetics was due to a significantly smaller decrease of venous blood pH (down to 7.33 vs. 7.27 in normals; P less than 0.05), probably a consequence of an latered muscle metabolism in insulin deficiency. Although no glucose was taken up, even during exercise, and less lactate was produced by insulin-deficient muscle (P less than 0.05), the differences in venous blood pH appeared to be brought about mainly by a different CO2 production of the exercising muscle in the two groups. The response of Krebs cycle activity to exercise in insulin-deficient muscle might have been inadequate, as suggested by the increased 3-hydroxybutyrate/acetoacetate ratio in the venous blood observed in the normal controls but not in the diabetics. Furthermore, proportionally less of the arterial ketone body concentration was utilized by the working muscle in the insulin-deficient diabetics. Changes in erythrocyte 2,3-diphosphoglycerate did not contribute to the differences in the in-vivo Bohr effect.
Muscle metabolism during rest and exercise: influence on the oxygen transport system of blood in normal and diabetic subjects. The oxygen dissociation curve shifted less to the right in venous blood draining from muscle in eight insulin-deficient diabetics working at a constant submaximal workload than in seven normal controls (28.7 mm. Hg vs. 30.8 mm Hg; P less than 0.05). This diminution of the in-vivo Bohr effect at the muscle tissue level during exercise in diabetics was due to a significantly smaller decrease of venous blood pH (down to 7.33 vs. 7.27 in normals; P less than 0.05), probably a consequence of an latered muscle metabolism in insulin deficiency. Although no glucose was taken up, even during exercise, and less lactate was produced by insulin-deficient muscle (P less than 0.05), the differences in venous blood pH appeared to be brought about mainly by a different CO2 production of the exercising muscle in the two groups. The response of Krebs cycle activity to exercise in insulin-deficient muscle might have been inadequate, as suggested by the increased 3-hydroxybutyrate/acetoacetate ratio in the venous blood observed in the normal controls but not in the diabetics. Furthermore, proportionally less of the arterial ketone body concentration was utilized by the working muscle in the insulin-deficient diabetics. Changes in erythrocyte 2,3-diphosphoglycerate did not contribute to the differences in the in-vivo Bohr effect.
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PMID:9325
Effect of duodenal acidification on gastric mucus and acid secretion in conscious cats.
In cats with gastric fistulae and Heidenhein pouches, the effect of acid entering the duodenum on secretion of acid, pepsin, and mucus from the Heidenhain pouch during maximal acid stimulation with pentagastrin or histamine, was studied. Duodenal acidification produced stimulation of pepsin and mucus secretion comparable to that induced by exogenous hormones (secretin and the combination of secretin with cholecystokinin). In addition, duodenal acidification caused an increase in acid secretion, thus suggesting that, in addition to secretin and cholecystokinin, a factor that stimulates acid secretion was also released by acid.
Effect of duodenal acidification on gastric mucus and acid secretion in conscious cats. In cats with gastric fistulae and Heidenhein pouches, the effect of acid entering the duodenum on secretion of acid, pepsin, and mucus from the Heidenhain pouch during maximal acid stimulation with pentagastrin or histamine, was studied. Duodenal acidification produced stimulation of pepsin and mucus secretion comparable to that induced by exogenous hormones (secretin and the combination of secretin with cholecystokinin). In addition, duodenal acidification caused an increase in acid secretion, thus suggesting that, in addition to secretin and cholecystokinin, a factor that stimulates acid secretion was also released by acid.
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PMID:9327
Higher transpeptidation activity and broad acceptor specificity of gamma-glutamyltransferases of tumors.
The gamma-glutamyltransferase (EC 2.3.2.2) (=gamma-glutamyltranspeptidase, gamma-GTP) activity in hepatoma induced by 3'-methyl-4-(dimethylamino)azobenzene (3'-Me-DAB) was 120-fold higher than that of normal liver and high activity was also found in bovine hepatocellular carcinoma. gamma-GTPs from these malignant tissues responded more and showed broader specificity to gamma-glutamyl group acceptors than those from normal tissue such as bovine, rat, and mouse liver and bovine kidney. Three species of gamma-GTP were isolated from bovine kidney by DEAE-cellulose chromatography, whereas only two species were isolated from bovine hepatocellular carcinoma. The carcinoma lacked the least acidic enzyme species. Appropriate gamma-glutamyl group acceptors stimulated more-acidic enzyme species more than less-acidic species in both tissues. The fractions separated from the hepatoma were stimulated more than those of kidney by gamma-glutamyl group acceptor. The enzymes from normal tissues responded similarly to a gamma-glutamyl group acceptor irrespective of the difference in their activity. Thus, gamma-GTPs of malignant tissues appear to be more versatile for amino acid transport, both qualitatively and quantitatively. In these properties the enzyme of mouse fetal liver which showed the highest activity in the last period of pregnancy resembled the enzymes of malignant rather than normal tissues. The activity of hepatic gamma-GTP is not parallel with the rate of cell proliferation during normal development.
Higher transpeptidation activity and broad acceptor specificity of gamma-glutamyltransferases of tumors. The gamma-glutamyltransferase (EC 2.3.2.2) (=gamma-glutamyltranspeptidase, gamma-GTP) activity in hepatoma induced by 3'-methyl-4-(dimethylamino)azobenzene (3'-Me-DAB) was 120-fold higher than that of normal liver and high activity was also found in bovine hepatocellular carcinoma. gamma-GTPs from these malignant tissues responded more and showed broader specificity to gamma-glutamyl group acceptors than those from normal tissue such as bovine, rat, and mouse liver and bovine kidney. Three species of gamma-GTP were isolated from bovine kidney by DEAE-cellulose chromatography, whereas only two species were isolated from bovine hepatocellular carcinoma. The carcinoma lacked the least acidic enzyme species. Appropriate gamma-glutamyl group acceptors stimulated more-acidic enzyme species more than less-acidic species in both tissues. The fractions separated from the hepatoma were stimulated more than those of kidney by gamma-glutamyl group acceptor. The enzymes from normal tissues responded similarly to a gamma-glutamyl group acceptor irrespective of the difference in their activity. Thus, gamma-GTPs of malignant tissues appear to be more versatile for amino acid transport, both qualitatively and quantitatively. In these properties the enzyme of mouse fetal liver which showed the highest activity in the last period of pregnancy resembled the enzymes of malignant rather than normal tissues. The activity of hepatic gamma-GTP is not parallel with the rate of cell proliferation during normal development.
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PMID:9328
Ion selective effects of salicylate on antral mucosa.
The effects of luminal salicylate, 5mM, were measured on rates of ion transport by isolated antral mucosa. At neutral luminal pH, salicylate increases Na and decreases Cl permeability. Salicylate does not alter net Na transport but decreases net Cl secretion. At luminal pH 4, the effects of salicylate can be arbitrarily divided into two phases. The intitial phase is associated with an increase in Na and marked decrease in Cl permeability. Subsequently, a greater increase in Na permeability and a marked increase in Cl permeability occurs. Active Na transport persists in the presence of salicylate at pH 4. Indirect evidence also suggests that Cl secretion persists under these conditions, buy at a reduced rate. The rate of luminal acid acid loss also increases in the presence of salicylate. A 4-fold increase in salicylate concentration or decrease in luminal pH from 4 to 3 did not appear to intensify the effects observed for 5 mM salicylate at pH 4. The increase in cation and decrease in anion permeability observed at pH 7 and initially at pH 4 are compatible with an influence of a negative charge of the salicylate anion. The subsequent changes observed in the presence of acid also are compatible with the concept that as the mucosa becomes overwhelmed with acid, a nonspecific increase in permeability occurs. However, the effect of salicylate on active Cl transport is largely independent of acid diffusing into the mucosa.
Ion selective effects of salicylate on antral mucosa. The effects of luminal salicylate, 5mM, were measured on rates of ion transport by isolated antral mucosa. At neutral luminal pH, salicylate increases Na and decreases Cl permeability. Salicylate does not alter net Na transport but decreases net Cl secretion. At luminal pH 4, the effects of salicylate can be arbitrarily divided into two phases. The intitial phase is associated with an increase in Na and marked decrease in Cl permeability. Subsequently, a greater increase in Na permeability and a marked increase in Cl permeability occurs. Active Na transport persists in the presence of salicylate at pH 4. Indirect evidence also suggests that Cl secretion persists under these conditions, buy at a reduced rate. The rate of luminal acid acid loss also increases in the presence of salicylate. A 4-fold increase in salicylate concentration or decrease in luminal pH from 4 to 3 did not appear to intensify the effects observed for 5 mM salicylate at pH 4. The increase in cation and decrease in anion permeability observed at pH 7 and initially at pH 4 are compatible with an influence of a negative charge of the salicylate anion. The subsequent changes observed in the presence of acid also are compatible with the concept that as the mucosa becomes overwhelmed with acid, a nonspecific increase in permeability occurs. However, the effect of salicylate on active Cl transport is largely independent of acid diffusing into the mucosa.
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PMID:9329
Mechanism of prevention of aspirin-induced gastric lesions by bile duct legation in the rat.
Gastric reflux of bile has been reported to be essential for the production of acute gastric mucosal lesions by intragastric aspirin in the rat. The purpose of the present study was to determine whether bile duct legation of pylorus ligation in the rat inhibits asprin-induced gastric lesions, and, if so, what the protective mechanisms are. Operations were performed under ether anesthesia. Asprin, 200 mg per kg, was instilled into the stomach 1/2 hr postsurgery (bile duct ligation or pylorus ligation). Four hours later the rats were killed, the stomachs were examined, and mucosal lesions were scored. Bile duct ligation, but not pylorus ligation, significantly protected against aspirin-induced gastric-lesions. Bile duct ligation, in pylorus-ligated rats, inhibited gastric acid output by 78%. Instilling HCl + aspirin in bile duct-ligated rats restored lesion formation. Shunting bile to the colon (to prevent bile reflux) did not prevent aspirin lesions. Salicylate determination, to ascertain whether bile duct ligation altered asprin absorption, revealed no significant differences between bile duct ligation and aspirin, shunt + aspirin, and sham shunt + aspirin in plasma and gastric tissue salicylate concentrations. (1) Bile duct legation protects against aspirin-induced gastric mucosal lesions by inhibiting gastric HCl secretion. As a corollary, a certain amount of acid in the stomach is necessary for aspirin-induced gastric lesions to form. (2) Bile reflux is not necessary for aspirn-induced gastric lesions in the rat.
Mechanism of prevention of aspirin-induced gastric lesions by bile duct legation in the rat. Gastric reflux of bile has been reported to be essential for the production of acute gastric mucosal lesions by intragastric aspirin in the rat. The purpose of the present study was to determine whether bile duct legation of pylorus ligation in the rat inhibits asprin-induced gastric lesions, and, if so, what the protective mechanisms are. Operations were performed under ether anesthesia. Asprin, 200 mg per kg, was instilled into the stomach 1/2 hr postsurgery (bile duct ligation or pylorus ligation). Four hours later the rats were killed, the stomachs were examined, and mucosal lesions were scored. Bile duct ligation, but not pylorus ligation, significantly protected against aspirin-induced gastric-lesions. Bile duct ligation, in pylorus-ligated rats, inhibited gastric acid output by 78%. Instilling HCl + aspirin in bile duct-ligated rats restored lesion formation. Shunting bile to the colon (to prevent bile reflux) did not prevent aspirin lesions. Salicylate determination, to ascertain whether bile duct ligation altered asprin absorption, revealed no significant differences between bile duct ligation and aspirin, shunt + aspirin, and sham shunt + aspirin in plasma and gastric tissue salicylate concentrations. (1) Bile duct legation protects against aspirin-induced gastric mucosal lesions by inhibiting gastric HCl secretion. As a corollary, a certain amount of acid in the stomach is necessary for aspirin-induced gastric lesions to form. (2) Bile reflux is not necessary for aspirn-induced gastric lesions in the rat.
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PMID:9330
Gastric mucosal lesions produced by intravenous infusion of aspirin in cats.
Aspirin was given by continuous intravenous infusion to 35 intact cats for 7 days in doses ranging from 25 to 200 mg kg-1 day-1. Gastric mucosal lesions occurred in 50 to 70% of the animals in the various dosage groups, including deep ulcers in 20%. All of the ulcers were in antral mucosa near its border with oxyntic mucosa. The incidence of lesions, including ulcers, showed no apparent relation to the dose of aspirin. With all but the highest dose, plasma salicylate levels were within or below what is regarded as the therapeutic range for man. Asprin, 100 mg kg-1 day-1, was given for 7 days to 4 cats with pouches containing all of the antral mucosa plus some oxyntic mucosa. One or more deep ulcers occurred in the antral mucosa of the pouches in each of these 4 cats. The electrical potential difference across the mucosa did not decrease, and net fluxes of hydrogen ions out of the pouch and of sodium ions into the pouch did not increase during the 7 days of aspirin administration despite the occurrence of ulcers in the pouches. It is concluded that intravenous aspirin, in doses giving plasma levels within or below the therapeutic range for man, causes gastric mucosal lesions including deep ulcers within 7 days in cats. These lesions occur without the changes in electrical potential difference and hydrogen and sodium fluxes that are regarded as characteristic of the "broken barrier."
Gastric mucosal lesions produced by intravenous infusion of aspirin in cats. Aspirin was given by continuous intravenous infusion to 35 intact cats for 7 days in doses ranging from 25 to 200 mg kg-1 day-1. Gastric mucosal lesions occurred in 50 to 70% of the animals in the various dosage groups, including deep ulcers in 20%. All of the ulcers were in antral mucosa near its border with oxyntic mucosa. The incidence of lesions, including ulcers, showed no apparent relation to the dose of aspirin. With all but the highest dose, plasma salicylate levels were within or below what is regarded as the therapeutic range for man. Asprin, 100 mg kg-1 day-1, was given for 7 days to 4 cats with pouches containing all of the antral mucosa plus some oxyntic mucosa. One or more deep ulcers occurred in the antral mucosa of the pouches in each of these 4 cats. The electrical potential difference across the mucosa did not decrease, and net fluxes of hydrogen ions out of the pouch and of sodium ions into the pouch did not increase during the 7 days of aspirin administration despite the occurrence of ulcers in the pouches. It is concluded that intravenous aspirin, in doses giving plasma levels within or below the therapeutic range for man, causes gastric mucosal lesions including deep ulcers within 7 days in cats. These lesions occur without the changes in electrical potential difference and hydrogen and sodium fluxes that are regarded as characteristic of the "broken barrier."
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PMID:9331
Influence of acid secretory state on the gastric mucosal tolerance to back diffusion of H+.
The effect of back diffusion of H+ PON THE POTENTIAL DIFFERence (PD), electrical resistance (R), and short circuit current (Isc) of spontaneously secreting and burimamide-inhibited amphibian gastric mucosae were studied in vitro. When back diffusion of H+ was induced by the passage of an electrical current of 510 mua per cm2 from the secretory (S) side of pH 2.25 to the nutrient side (N) for 30 min, the spontaneously secreting mucosae showed small decreases in PD (23.6 leads to 16.2 mv) and Isc (80 leads to 61 mua per cm2) but no significant change in R. In the burimamide-inhibited mucosae there were marked and significantly greater decreases of PD (26.8 leads to 3.4 mv), R (473 leads to 170 ohms cm2) and Isc (50 leads to 13 mua per cm2). When back diffusion of H+ was induced by establishing a concentration gradient of H+ from S leads to N or by exposing the secretory surface to sodium taurocholate with secretory pH 2.25, the burimamide-inhibited tissue demonstrated significantly greater depression of the electrical parameters than the secreting mucosae. Intracellular pH, measured by the 5,5-dimethoxyazolidine-2,4-dione method, was significantly higher in the histamine-stimulated tissues (7.28) than in the metiamide-inhibited tissues (7.11). These studies strongly suggest that the secretory status of the mucosa and hence its acid-base status are important determinants in the tolerance of the tissue to exogenous back diffusion of H+. The measure of absolute loss of H+ From the mucosal solution alone may not be an adequate assessment of the gastric mucosal barrier.
Influence of acid secretory state on the gastric mucosal tolerance to back diffusion of H+. The effect of back diffusion of H+ PON THE POTENTIAL DIFFERence (PD), electrical resistance (R), and short circuit current (Isc) of spontaneously secreting and burimamide-inhibited amphibian gastric mucosae were studied in vitro. When back diffusion of H+ was induced by the passage of an electrical current of 510 mua per cm2 from the secretory (S) side of pH 2.25 to the nutrient side (N) for 30 min, the spontaneously secreting mucosae showed small decreases in PD (23.6 leads to 16.2 mv) and Isc (80 leads to 61 mua per cm2) but no significant change in R. In the burimamide-inhibited mucosae there were marked and significantly greater decreases of PD (26.8 leads to 3.4 mv), R (473 leads to 170 ohms cm2) and Isc (50 leads to 13 mua per cm2). When back diffusion of H+ was induced by establishing a concentration gradient of H+ from S leads to N or by exposing the secretory surface to sodium taurocholate with secretory pH 2.25, the burimamide-inhibited tissue demonstrated significantly greater depression of the electrical parameters than the secreting mucosae. Intracellular pH, measured by the 5,5-dimethoxyazolidine-2,4-dione method, was significantly higher in the histamine-stimulated tissues (7.28) than in the metiamide-inhibited tissues (7.11). These studies strongly suggest that the secretory status of the mucosa and hence its acid-base status are important determinants in the tolerance of the tissue to exogenous back diffusion of H+. The measure of absolute loss of H+ From the mucosal solution alone may not be an adequate assessment of the gastric mucosal barrier.
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PMID:9332
gamma-glutamyl transpeptidase of rat intestine: localization and possible role in amino acid transport.
gamma-Glutamyl transpeptidase (gamma-GT), an enzyme possibly involved in amino acid transport, was investigated in rat small intestine using the synthetic substrate L-gamma-glutamyl-p-nitroanilide. Enzyme localization and characteristics were correlated with features of amino acid uptake. gamma-GT activity copurified with sucrase and alkaline phosphatase. Activity was maximal at pH 8.2 and was stimulated by monovalent cations. The relative specificity of the gamma-GT reaction with diglycine and eight essential amino acids as substrates correlated well with the rate of intestinal absorption of this dipeptide and these amino acids as observed by others. gamma-GT activity was 12-fold greater in the jejunum than in the ileum, again in agreement with relative rates of amino acid absorption along the length of rat intestine. The specific activity of gamma-GT in villus tip cells was 10 times greater than in crypt cells, and amino acid uptake was 2 to 6 times greater with villus tip than with crypt cells. Bromosulfophthalein, a noncompetitive inhibitor of gamma-GT, inhibited amino acid uptake. These studies support the concept that membrane gamma-GT may be involved in amino acid and dipeptide uptake, and indicate that further investigation of such involvement may be conveniently pursued using mammalian small bowel.
gamma-glutamyl transpeptidase of rat intestine: localization and possible role in amino acid transport. gamma-Glutamyl transpeptidase (gamma-GT), an enzyme possibly involved in amino acid transport, was investigated in rat small intestine using the synthetic substrate L-gamma-glutamyl-p-nitroanilide. Enzyme localization and characteristics were correlated with features of amino acid uptake. gamma-GT activity copurified with sucrase and alkaline phosphatase. Activity was maximal at pH 8.2 and was stimulated by monovalent cations. The relative specificity of the gamma-GT reaction with diglycine and eight essential amino acids as substrates correlated well with the rate of intestinal absorption of this dipeptide and these amino acids as observed by others. gamma-GT activity was 12-fold greater in the jejunum than in the ileum, again in agreement with relative rates of amino acid absorption along the length of rat intestine. The specific activity of gamma-GT in villus tip cells was 10 times greater than in crypt cells, and amino acid uptake was 2 to 6 times greater with villus tip than with crypt cells. Bromosulfophthalein, a noncompetitive inhibitor of gamma-GT, inhibited amino acid uptake. These studies support the concept that membrane gamma-GT may be involved in amino acid and dipeptide uptake, and indicate that further investigation of such involvement may be conveniently pursued using mammalian small bowel.
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PMID:9333
Association of inflammatory bowel disease and large vascular lesions.
A case of inflammatory bowel disease with associated multiple large vessel vascular lesions similar to that seen in Takayasu's arteritis is described in a 15-year-old female. It is suggested that this type of vascular lesion may represent another rare systemic manifestation of inflammatory bowel disease.
Association of inflammatory bowel disease and large vascular lesions. A case of inflammatory bowel disease with associated multiple large vessel vascular lesions similar to that seen in Takayasu's arteritis is described in a 15-year-old female. It is suggested that this type of vascular lesion may represent another rare systemic manifestation of inflammatory bowel disease.
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PMID:9338
Presence or absence of inhibitors of crystal growth in bile. 1. Effect of bile on the formation of calcium phosphate, a constituent of gallstones.
When calcium and phosphate ions were mixed so that their final concentration was 4 mmol/1 and the pH was kept at 7-0, an amorphous precipitate immediately formed and this changed into crystalline material with an apatite-like structure after a period of time. The formation of either or both types of precipitate could be slowed down or prevented by adding to the crystallising medium trace amounts of pyrophosphate or citrate which are known inhibitors of the formation of calcium phosphate, or large quantities of sodium chloride which increased the ionic strength of the solution and hence the solubility of calcium phosphate, Both common duct and gallbladder bile from patients with gallstones composed of cholesterol and/or calcium carbonate had a very pronounced inhibitory action on the formation of these precipitates. Only very small amounts of bile were necessary to produce these effects, which therefore were not due to an increase in ionic strength. Ultrafiltration of bile showed that material with a molecular weight greater than 10 000 was mainly responsible for this activity. Because the inhibitor was present in both common duct and gallbladder bile, the liver is the likely source of origin. The possible identity of this material is examined. The powerful inhibitory effect of bile on the crystallisation of calcium phosphate is probably a contributory factor to the rare occurrence of the calcium phosphates, apatite and whitlockite, in gallstones.
Presence or absence of inhibitors of crystal growth in bile. 1. Effect of bile on the formation of calcium phosphate, a constituent of gallstones. When calcium and phosphate ions were mixed so that their final concentration was 4 mmol/1 and the pH was kept at 7-0, an amorphous precipitate immediately formed and this changed into crystalline material with an apatite-like structure after a period of time. The formation of either or both types of precipitate could be slowed down or prevented by adding to the crystallising medium trace amounts of pyrophosphate or citrate which are known inhibitors of the formation of calcium phosphate, or large quantities of sodium chloride which increased the ionic strength of the solution and hence the solubility of calcium phosphate, Both common duct and gallbladder bile from patients with gallstones composed of cholesterol and/or calcium carbonate had a very pronounced inhibitory action on the formation of these precipitates. Only very small amounts of bile were necessary to produce these effects, which therefore were not due to an increase in ionic strength. Ultrafiltration of bile showed that material with a molecular weight greater than 10 000 was mainly responsible for this activity. Because the inhibitor was present in both common duct and gallbladder bile, the liver is the likely source of origin. The possible identity of this material is examined. The powerful inhibitory effect of bile on the crystallisation of calcium phosphate is probably a contributory factor to the rare occurrence of the calcium phosphates, apatite and whitlockite, in gallstones.
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PMID:9340
[Interaction of dl-mandelamidine (Olimidine) with some antihypertensive drugs expressed in the blood pressure of conscious rats].
Hypotensive effect of dl-Mandelamidine (Olmidine, MA) in combination with some established antihypertensive drugs was studied in conscious normotensive rats. The mean blood pressure and heart rate were measured by means of a pressure transducer via a polyethylene tube inserted into the abdominal aorta of rat according to the method described by Weeks. The results obtained were as follows; 1) The hypotensive effects of guanethidine and hydrochlorothiazide were enhanced in combination with MA. 2) The hypotensive effect of reserpine was reduced by MA. 3) The hypotensive effects of clonidine, C6, propranolol and hydralazine were uneffected by MA. On the other hand, changes in heart rate induced by reserpine and C6 were increased by MA, however, those induced by guanethidine, clonidine propranolol and hydralazine were decreased by MA. The slight decrease in heart rate induced by hydrochlorothiazide was uneffected by MA. In view of our data, it is considered important that investigation of the interaction of antihypertensive drugs be done using conscious animals, as these drugs will be clinically prescribed.
[Interaction of dl-mandelamidine (Olimidine) with some antihypertensive drugs expressed in the blood pressure of conscious rats]. Hypotensive effect of dl-Mandelamidine (Olmidine, MA) in combination with some established antihypertensive drugs was studied in conscious normotensive rats. The mean blood pressure and heart rate were measured by means of a pressure transducer via a polyethylene tube inserted into the abdominal aorta of rat according to the method described by Weeks. The results obtained were as follows; 1) The hypotensive effects of guanethidine and hydrochlorothiazide were enhanced in combination with MA. 2) The hypotensive effect of reserpine was reduced by MA. 3) The hypotensive effects of clonidine, C6, propranolol and hydralazine were uneffected by MA. On the other hand, changes in heart rate induced by reserpine and C6 were increased by MA, however, those induced by guanethidine, clonidine propranolol and hydralazine were decreased by MA. The slight decrease in heart rate induced by hydrochlorothiazide was uneffected by MA. In view of our data, it is considered important that investigation of the interaction of antihypertensive drugs be done using conscious animals, as these drugs will be clinically prescribed.
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PMID:9341
[Metabolic fate of carteolol hydrochloride (OPC-1085), a new beta-adrenergic agent. (3) Autoradiographic total body distribution studies in mice].
Distribution of a new beta-adrenergic blocking agent, 3H-carteolol in mice was studied by whole body autoradiography. The distribution of radioactivity was observed in all organs except the eyes and brain, with particularly high specific activities in the kidneys, liver, gall bladder and content in the intestines within a short time after either oral or intravenous administration. The radioactivity was then promptly eliminated from all tissues and organs, and excreted almost entirely in the urine and bile. Propranolol is known to be distributed at a high concentration in the brain, whereas the concentration of (3H-) carteolol detectable in the brain was slight. In the adrenal gland, the radioactivity was localized in the medulla. Radioactivity was detected also in the stomach contents after the intravenous administration. The distribution of radioactivity in the fetus through the placenta was less than that in the major organs of the mother mouse, and the elimination of the activity was more rapid in the fetus than in mother. These findings indicate that carteolol and its metabolites do to some extent pass through the blood-brain barrier and placenta.
[Metabolic fate of carteolol hydrochloride (OPC-1085), a new beta-adrenergic agent. (3) Autoradiographic total body distribution studies in mice]. Distribution of a new beta-adrenergic blocking agent, 3H-carteolol in mice was studied by whole body autoradiography. The distribution of radioactivity was observed in all organs except the eyes and brain, with particularly high specific activities in the kidneys, liver, gall bladder and content in the intestines within a short time after either oral or intravenous administration. The radioactivity was then promptly eliminated from all tissues and organs, and excreted almost entirely in the urine and bile. Propranolol is known to be distributed at a high concentration in the brain, whereas the concentration of (3H-) carteolol detectable in the brain was slight. In the adrenal gland, the radioactivity was localized in the medulla. Radioactivity was detected also in the stomach contents after the intravenous administration. The distribution of radioactivity in the fetus through the placenta was less than that in the major organs of the mother mouse, and the elimination of the activity was more rapid in the fetus than in mother. These findings indicate that carteolol and its metabolites do to some extent pass through the blood-brain barrier and placenta.
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PMID:9342
Biochemical basis of an animal model of depressive illness--a preliminary report--.
Biochemical analyses of brain samples of an Animal Model of Depression indicate the state of motionlessness observed in response to a conditioned stimulus was due to an excess in functional activity of serotonin. An excess functional activity of serotonin may be directly responsible for human depressive illness. This conflicting conclusion to the currently popular theories of serotonin deficiency was discussed with reference to the animal and clinical data in the literature which are consistent with the conclusion.
Biochemical basis of an animal model of depressive illness--a preliminary report--. Biochemical analyses of brain samples of an Animal Model of Depression indicate the state of motionlessness observed in response to a conditioned stimulus was due to an excess in functional activity of serotonin. An excess functional activity of serotonin may be directly responsible for human depressive illness. This conflicting conclusion to the currently popular theories of serotonin deficiency was discussed with reference to the animal and clinical data in the literature which are consistent with the conclusion.
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PMID:9344
[Current resistence situation in a surgical and urological department].
Spectrum and sensitivity of bacteria were studied at the Surgical (534 positive wound smears) and the Urological Clinics (7879 urine specimens). Krankenhaus Nordwest, Frankfurt/M., during the period of 1969-1971 and in 1973. The most common organisms identified in wound smears were E. coli, followed by Staph. areus, Aerobacter and Proteus species. E. coli were also predominant in urine, but followed by Enterococci, Proteus and Pseudomonas. E. coli, Proteus species and especially Pseudomonas increased in number whereas Enterococci decreased. There was no pronounced increase in resistance to 9 current antibiotics as well as to chemotherapeutics during the observation period which was particularly striking in the case of Ampicillin used on a large scale. The results of our study support the presently employed therapeutic method using bactericidal antibiotics of the penicillin group in strict indications.
[Current resistence situation in a surgical and urological department]. Spectrum and sensitivity of bacteria were studied at the Surgical (534 positive wound smears) and the Urological Clinics (7879 urine specimens). Krankenhaus Nordwest, Frankfurt/M., during the period of 1969-1971 and in 1973. The most common organisms identified in wound smears were E. coli, followed by Staph. areus, Aerobacter and Proteus species. E. coli were also predominant in urine, but followed by Enterococci, Proteus and Pseudomonas. E. coli, Proteus species and especially Pseudomonas increased in number whereas Enterococci decreased. There was no pronounced increase in resistance to 9 current antibiotics as well as to chemotherapeutics during the observation period which was particularly striking in the case of Ampicillin used on a large scale. The results of our study support the presently employed therapeutic method using bactericidal antibiotics of the penicillin group in strict indications.
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PMID:9345
[Newer aspects in the therapy of angina pectoris].
Progress in coronary surgery has led to new aspects in the treatment of angina pectoris. According to the coronar-angiographic findings, which make an exact identification of the coronary heart disease possible, and according to the ventricular function a therapeutic strategy can be determined today with adequate safety for each individual case. The most important criterium for a decision for surgical or conservative treatment is not only the improvement of the subjective symptoms, in special forms of coronary heart disease the bypass-operation not only results in improved quality of life but also in a considerably increased survival time.
[Newer aspects in the therapy of angina pectoris]. Progress in coronary surgery has led to new aspects in the treatment of angina pectoris. According to the coronar-angiographic findings, which make an exact identification of the coronary heart disease possible, and according to the ventricular function a therapeutic strategy can be determined today with adequate safety for each individual case. The most important criterium for a decision for surgical or conservative treatment is not only the improvement of the subjective symptoms, in special forms of coronary heart disease the bypass-operation not only results in improved quality of life but also in a considerably increased survival time.
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PMID:9346
[Inflammatory intestinal diseases: ulcerative colitis and Crohn's disease. Early diagnosis and treatment].
Early rather characteristic symptoms are found in ulcerative colitis as well as in Crohn's disease. In these patients, but also in an advanced stage, differential diagnosis between these two disorders is possible by means of endoscopic techniques and guided biopsy. In a high percentage of patients with ulcerative colitis good results are obtained with conservative therapy, using salazopyridine alone or in combination with cortisone. Combination therapy with salazopyridine and cortisone seems to offer the best results in Crohn's disease too, however, in a certain percentage of cases surgical intervention is unavoidable.
[Inflammatory intestinal diseases: ulcerative colitis and Crohn's disease. Early diagnosis and treatment]. Early rather characteristic symptoms are found in ulcerative colitis as well as in Crohn's disease. In these patients, but also in an advanced stage, differential diagnosis between these two disorders is possible by means of endoscopic techniques and guided biopsy. In a high percentage of patients with ulcerative colitis good results are obtained with conservative therapy, using salazopyridine alone or in combination with cortisone. Combination therapy with salazopyridine and cortisone seems to offer the best results in Crohn's disease too, however, in a certain percentage of cases surgical intervention is unavoidable.
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PMID:9347
[Polygraphic recording of sleep under the influence of Plantival plus].
10 patients with moderate non-psychotic sleep disturbances were investigated polygraphically for a total of 14 nights each. These 14 nights were subdivided into 4 test series: Placebo was given during the first, Plantival plus during the second and third and placebo again during the fourth series. The results showed that wakefulness decreased after the application of Plantival plus and that there was an increase in deep sleep. These effects could be observed mainly during the first hour of sleep and disappeared gradually during the later sleeping hours. REM-phases were not influenced by the medication. Due to these observations, Plantival plus should mainly be applicated when disturbances in falling asleep and problems in sleeping continuously occur. In case interrupted sleep in the early morning hours has been found, this preparation could be applicated only in combination with other kinds of treatment.
[Polygraphic recording of sleep under the influence of Plantival plus]. 10 patients with moderate non-psychotic sleep disturbances were investigated polygraphically for a total of 14 nights each. These 14 nights were subdivided into 4 test series: Placebo was given during the first, Plantival plus during the second and third and placebo again during the fourth series. The results showed that wakefulness decreased after the application of Plantival plus and that there was an increase in deep sleep. These effects could be observed mainly during the first hour of sleep and disappeared gradually during the later sleeping hours. REM-phases were not influenced by the medication. Due to these observations, Plantival plus should mainly be applicated when disturbances in falling asleep and problems in sleeping continuously occur. In case interrupted sleep in the early morning hours has been found, this preparation could be applicated only in combination with other kinds of treatment.
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PMID:9348
Poly(adenosine diphosphate ribose) is covalently linked to nuclear proteins by two types of bonds.
(ADP-ribose)n residues formed by short-term incubation of adult rat liver and Ehrlich carcinoma nuclei with labeled NAD were analyzed by Cs2SO4/guanidinium chloride/urea density gradient centrifugation. Comparison with samples in which the protein had been completely digested revealed that most, or probably all, acid-insoluble (ADP-ribose)n chains are covalently bound to nuclear proteins, as is true for the short, acid-soluble (ADP-ribose)n chains. Complete release of (ADP-ribose)n chains is effected by dilute alkali. In contrast, NH2OH liberated only part of the long and the short (ADP-ribose)n residues from the protein conjugates, indicating two types of bonds, both alkali-labile, but only one susceptible to neutral hydroxylamine. Both types of bonds were equally distributed among acid-soluble and acid-insoluble (ADP-ribose)n chains. -Stability of the (ADP-ribose)n protein conjugates during isolation is only guaranteed at pH values below 7.
Poly(adenosine diphosphate ribose) is covalently linked to nuclear proteins by two types of bonds. (ADP-ribose)n residues formed by short-term incubation of adult rat liver and Ehrlich carcinoma nuclei with labeled NAD were analyzed by Cs2SO4/guanidinium chloride/urea density gradient centrifugation. Comparison with samples in which the protein had been completely digested revealed that most, or probably all, acid-insoluble (ADP-ribose)n chains are covalently bound to nuclear proteins, as is true for the short, acid-soluble (ADP-ribose)n chains. Complete release of (ADP-ribose)n chains is effected by dilute alkali. In contrast, NH2OH liberated only part of the long and the short (ADP-ribose)n residues from the protein conjugates, indicating two types of bonds, both alkali-labile, but only one susceptible to neutral hydroxylamine. Both types of bonds were equally distributed among acid-soluble and acid-insoluble (ADP-ribose)n chains. -Stability of the (ADP-ribose)n protein conjugates during isolation is only guaranteed at pH values below 7.
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PMID:9349
On the mechanism and some properties of vinylacetyl-CoA delta-isomerase of Clostridium kluyveri.
Vinylacetyl-CoA delta-isomerase from Clostridium kluyveri grown on ethanol/acetate was purified 32-fold. The enzyme is rather labile. All experiments were conducted with the substrate analog thioester of vinylacetic acid and N-acetylchysteamine (vinylacetyl-SEtNAc (1 f)). 3-Butinoyl-SEtNAc is a strong inhibitor of the isomerase. The hydrogen transfer from the alpha-position of vinylacetyl-SEtNAc to the gamma-position of 2-butenoyl-SEtNAc (1f leads to 2 f) occurs partially intramolecularly (40-50%) as shown by experiments in 3HOH/H2O, 2H2O and 3HOH/2H2O as well as by experiments with [2,3-3H]vinylacetyl-SEtNAc. Only 0.07 atoms of tritium are incorporated into the gamma-position of 2f when the isomerisation takes place in 3HOH/H2O. The extent of intramolecularity is in agreement with results of experiments conducted in 2H2O with whole cells [4]. The reaction 1f leads to 2f shows no or only negligiebl reversibility and at least no considerable isotope effect.
On the mechanism and some properties of vinylacetyl-CoA delta-isomerase of Clostridium kluyveri. Vinylacetyl-CoA delta-isomerase from Clostridium kluyveri grown on ethanol/acetate was purified 32-fold. The enzyme is rather labile. All experiments were conducted with the substrate analog thioester of vinylacetic acid and N-acetylchysteamine (vinylacetyl-SEtNAc (1 f)). 3-Butinoyl-SEtNAc is a strong inhibitor of the isomerase. The hydrogen transfer from the alpha-position of vinylacetyl-SEtNAc to the gamma-position of 2-butenoyl-SEtNAc (1f leads to 2 f) occurs partially intramolecularly (40-50%) as shown by experiments in 3HOH/H2O, 2H2O and 3HOH/2H2O as well as by experiments with [2,3-3H]vinylacetyl-SEtNAc. Only 0.07 atoms of tritium are incorporated into the gamma-position of 2f when the isomerisation takes place in 3HOH/H2O. The extent of intramolecularity is in agreement with results of experiments conducted in 2H2O with whole cells [4]. The reaction 1f leads to 2f shows no or only negligiebl reversibility and at least no considerable isotope effect.
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PMID:9350
A kallikrein-specific inhibitor in rat kidney tubules.
A kallikrein inhibitor was found in tubules of the rat kidney and purified by chromatography on Sephadex G-100. The molecular weight of the inhibitor, estimated by gel filtration and dodecylsulfate electrophoresis, is about 4700. It inhibits the following kallikreins: porcine submanidbular and pancreatic kallikrein, rat kidney and urine kallikrein, and human urine and plasma kallikrein. An inhibition of bovine trypsin was not observed.
A kallikrein-specific inhibitor in rat kidney tubules. A kallikrein inhibitor was found in tubules of the rat kidney and purified by chromatography on Sephadex G-100. The molecular weight of the inhibitor, estimated by gel filtration and dodecylsulfate electrophoresis, is about 4700. It inhibits the following kallikreins: porcine submanidbular and pancreatic kallikrein, rat kidney and urine kallikrein, and human urine and plasma kallikrein. An inhibition of bovine trypsin was not observed.
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PMID:9351
[Preparation and some properties of immobilized trypsin from the crayfish Cambarus affinis Say (author's transl)].
The anionic tryptic enzyme from the crayfish (crayfish trypsin) was adsorbed to DEAE-Sephadex A-50 and covalently coupled to BrCN-activated Sepharose 4B and porous glass loaded with isothiocyanate propyl groups (ITC-glass). The relative activities against p-tosylarginine methyl ester (TosArgOMe) were found to be 30 to 100% for DEAE-Sephadex crayfish trypsin, 20 to 53% for Sepharose crayfish trypsin, and 17 to 38% for ITC-glass crayfish trypsin. The relative activities rise with declining protein content of the enzyme matrix complexes. The highest relative proteinase activities (substrate: 1% casein) were obtained with Sepharose crayfish trypsin (74%), followed by DEAE-Sephadex crayfish trypsin (68%) and ITC-glass crayfish trypsin (45%). Similar results are obtained with protamine and native lactate dehydrogenase as substrates. In accordance with the Sepharose bovine trypsin complex the apparent Michaelis constant (Km(app)) of the Sepharose crayfish trypsin with TosArgOMe was found to be markedly higher than that of the native enzyme. The pH-activity profiles of the crayfish trypsin derivatives using TosArgOMe as substrate were shown to be displaced towards more alkaline pH values by 0.5 (ITC-glass crayfish trypsin) and 1 (Sepharose crayfish trypsin) pH units, respectively, or towards more acidic pH values (by 1.5 pH units) with the polycationic derivative (DEAE-Sephadex crayfish trypsin) as compared to the native enzyme (optimum pH 8.6). Concerning the temperature stability of the derivatives, Sepharose crayfish trypsin was more stabile, ITC-glass crayfish trypsin behaves like the native crayfish trypsin, and DEAE-Sephadex crayfish trypsin was more sensitive at elevated temperatures as compared to the soluble enzyme. The properties of the crayfish trypsin derivatives are compared with the properties of the bovine analogues.
[Preparation and some properties of immobilized trypsin from the crayfish Cambarus affinis Say (author's transl)]. The anionic tryptic enzyme from the crayfish (crayfish trypsin) was adsorbed to DEAE-Sephadex A-50 and covalently coupled to BrCN-activated Sepharose 4B and porous glass loaded with isothiocyanate propyl groups (ITC-glass). The relative activities against p-tosylarginine methyl ester (TosArgOMe) were found to be 30 to 100% for DEAE-Sephadex crayfish trypsin, 20 to 53% for Sepharose crayfish trypsin, and 17 to 38% for ITC-glass crayfish trypsin. The relative activities rise with declining protein content of the enzyme matrix complexes. The highest relative proteinase activities (substrate: 1% casein) were obtained with Sepharose crayfish trypsin (74%), followed by DEAE-Sephadex crayfish trypsin (68%) and ITC-glass crayfish trypsin (45%). Similar results are obtained with protamine and native lactate dehydrogenase as substrates. In accordance with the Sepharose bovine trypsin complex the apparent Michaelis constant (Km(app)) of the Sepharose crayfish trypsin with TosArgOMe was found to be markedly higher than that of the native enzyme. The pH-activity profiles of the crayfish trypsin derivatives using TosArgOMe as substrate were shown to be displaced towards more alkaline pH values by 0.5 (ITC-glass crayfish trypsin) and 1 (Sepharose crayfish trypsin) pH units, respectively, or towards more acidic pH values (by 1.5 pH units) with the polycationic derivative (DEAE-Sephadex crayfish trypsin) as compared to the native enzyme (optimum pH 8.6). Concerning the temperature stability of the derivatives, Sepharose crayfish trypsin was more stabile, ITC-glass crayfish trypsin behaves like the native crayfish trypsin, and DEAE-Sephadex crayfish trypsin was more sensitive at elevated temperatures as compared to the soluble enzyme. The properties of the crayfish trypsin derivatives are compared with the properties of the bovine analogues.
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PMID:9352
Identity of kynurenine: pyruvate aminotransferase with histidine: pyruvate aminotransferase.
Kynurenine pyruvate aminotransferase was purified from rat kidney. The purified enzyme had an isoelectric point of pH 5.2 and a pH optimum of 9.3. The enzyme was active with pyruvate as amino acceptor but not with 2-oxoglutarate, and utilized various aromatic amino acids as amino donors. L-Amino acids were effective in the following order of activity: histidine greather than phenylalanine greater than kynurenine greater than tyrosine greater than tryptophan greater than 5-hydroxytryptophan. The apparent Km values were about 0.63 mM, 1.4 mM and 0.09 mM for histidine, kynurenine and phenylalanine, respectively. Km values for pyruvate were 5.5 mM with histidine as amino donor, 1.3 mM with kynurenine and 8.5 mM with phenylalanine. Kynurenine pyruvate aminotransferase activity of the enzyme was inhibited by the addition of histidine or phenylalanine. The molecular weights determined by gel filtration and sucrose density gradient centrifugation were approximately 76000 and 79000, respectively. On the basis of purification ratio, substrate specificity, inhibition by common substrates, subcellular distribution, isoelectric focusing and polyacrylamide-gel electrophoresis, it is suggested that kynurenine pyruvate aminotransferase is identical with histidine pyruvate aminotransferase and also with phenylalanine pyruvate aminotransferase. The physiological significance of the enzyme is discussed.
Identity of kynurenine: pyruvate aminotransferase with histidine: pyruvate aminotransferase. Kynurenine pyruvate aminotransferase was purified from rat kidney. The purified enzyme had an isoelectric point of pH 5.2 and a pH optimum of 9.3. The enzyme was active with pyruvate as amino acceptor but not with 2-oxoglutarate, and utilized various aromatic amino acids as amino donors. L-Amino acids were effective in the following order of activity: histidine greather than phenylalanine greater than kynurenine greater than tyrosine greater than tryptophan greater than 5-hydroxytryptophan. The apparent Km values were about 0.63 mM, 1.4 mM and 0.09 mM for histidine, kynurenine and phenylalanine, respectively. Km values for pyruvate were 5.5 mM with histidine as amino donor, 1.3 mM with kynurenine and 8.5 mM with phenylalanine. Kynurenine pyruvate aminotransferase activity of the enzyme was inhibited by the addition of histidine or phenylalanine. The molecular weights determined by gel filtration and sucrose density gradient centrifugation were approximately 76000 and 79000, respectively. On the basis of purification ratio, substrate specificity, inhibition by common substrates, subcellular distribution, isoelectric focusing and polyacrylamide-gel electrophoresis, it is suggested that kynurenine pyruvate aminotransferase is identical with histidine pyruvate aminotransferase and also with phenylalanine pyruvate aminotransferase. The physiological significance of the enzyme is discussed.
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PMID:9353
Studies on the proteinase-A inhibitor I3A from yeast.
The purification and some properties of the two inhibitors I2A and I3A of proteinase A from yeast have previously been described [Saheki et al, (1974) Eur. J. Biochem. 47, 325]. An improved method for the preparation of I3A which is less time-consuming and leads to higher yields is presented. Based on amino acid analysis, I3A contains 68 amino acids per molecule. The molecular weight was 7676. The inhibitor contained no proline, no arginine, no cysteine and no tryptophan, but did contain a large number of the polar amino acids glutamate + glutamine, aspartate + asparagine and lysine. Neither by dansylation nor by Edman degradation could an N-terminal amino acid be detected. Changes in the circular dichroism upon transition from pH 6.9 to 3.0 suggest different tertiary structures at these pH values. Experiments on the kinetics of inhibition of proteinase A revealed an apparent Ki value of 5.5 X 10(-8) M for I3A and 1.6 X 10(-8) M for pepstatin. A "non-stoichiometric inhibition" of a "pseudo-irreversible" type is concluded from the kinetic data. A hydrophobic type of binding of I3A to yeast proteinase A is suggested from experiments demonstrating a large decrease in the percentage of inhibition caused by addition of 2 M urea, 2 M guanidine hydrochloride, 0.125% Triton or 0.125% cholic acid.
Studies on the proteinase-A inhibitor I3A from yeast. The purification and some properties of the two inhibitors I2A and I3A of proteinase A from yeast have previously been described [Saheki et al, (1974) Eur. J. Biochem. 47, 325]. An improved method for the preparation of I3A which is less time-consuming and leads to higher yields is presented. Based on amino acid analysis, I3A contains 68 amino acids per molecule. The molecular weight was 7676. The inhibitor contained no proline, no arginine, no cysteine and no tryptophan, but did contain a large number of the polar amino acids glutamate + glutamine, aspartate + asparagine and lysine. Neither by dansylation nor by Edman degradation could an N-terminal amino acid be detected. Changes in the circular dichroism upon transition from pH 6.9 to 3.0 suggest different tertiary structures at these pH values. Experiments on the kinetics of inhibition of proteinase A revealed an apparent Ki value of 5.5 X 10(-8) M for I3A and 1.6 X 10(-8) M for pepstatin. A "non-stoichiometric inhibition" of a "pseudo-irreversible" type is concluded from the kinetic data. A hydrophobic type of binding of I3A to yeast proteinase A is suggested from experiments demonstrating a large decrease in the percentage of inhibition caused by addition of 2 M urea, 2 M guanidine hydrochloride, 0.125% Triton or 0.125% cholic acid.
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PMID:9359
Antigenicity of type-specific pneumococcal polysaccharides in rats.
Hemagglutinating antibody responses of Lewis-Wistar and Sprague-Dawley rats to graded doses of type-specific pneumococcal polysaccharide were measured. Rats given a small dose (0.2 to 50 mug)of type 1 or 8 polysaccharide intraperitoneally developed type-specific hemagglutinating antibody. Rats given larger doses of polysaccharide (greater than or equal to200 mug) did not develop detectable hemagglutinating antibody, and they were unresponsive to a subsequence injection of a small (and normally antigenic) dose of polysaccharide. There was prolonged antigenemia in rats injected with a large dose of polysaccharide. There was prolonged antigenemia in rats injected with a large dose of polysaccharide, and the kinetics of antigen clearance in these animals resembled that reported for mice with polysaccharide immunological paralysis. These results indicate that a phenomenon resembling immunological paralysis with type-specific pneumococcal polysaccharides can be produced in rats.
Antigenicity of type-specific pneumococcal polysaccharides in rats. Hemagglutinating antibody responses of Lewis-Wistar and Sprague-Dawley rats to graded doses of type-specific pneumococcal polysaccharide were measured. Rats given a small dose (0.2 to 50 mug)of type 1 or 8 polysaccharide intraperitoneally developed type-specific hemagglutinating antibody. Rats given larger doses of polysaccharide (greater than or equal to200 mug) did not develop detectable hemagglutinating antibody, and they were unresponsive to a subsequence injection of a small (and normally antigenic) dose of polysaccharide. There was prolonged antigenemia in rats injected with a large dose of polysaccharide. There was prolonged antigenemia in rats injected with a large dose of polysaccharide, and the kinetics of antigen clearance in these animals resembled that reported for mice with polysaccharide immunological paralysis. These results indicate that a phenomenon resembling immunological paralysis with type-specific pneumococcal polysaccharides can be produced in rats.
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