Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:2.6.1.1 (aspartate aminotransferase)
 21,665 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. Liver and serum aspartate aminotransferase (GOT) and alanine aminotransferase (GPT) activities were measured in a hibernating desert lizard, Uromastix hardwickii. The levels of both enzymes were found to be lower in hibernation than during the active period, particularly in the liver. 2. After intramuscular injection of 2 mg of cortisone acetate there was a rapid rise in the levels of these enzymes with a peak of 18 hours (GOT) and 12 hours (GPT). 3. The response of both enzymes to cortisone was much greater during the active period than during hibernation. 4. GOT showed a much more rapid and greater response to cortisone than GPT. This is in contrast to the response of rat liver where GPT is more responsive to this hormone. 5. These studies indicate that the transferase enzymes of this lizard differ from those of the rat in their sensitivity and time of response to cortisone.
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PMID:Effect of cortisone on aspartate and alanine aminotransferases in a desert lizard. 14 52

The effect of the 3-monthly injectable contraceptive depot medroxyporgesterone acetate (DMPA) on liver function and lipids was assessed in Thai women both with and without liver fluke (Ophisthorchis viverrini) infestation. DMPA administration was started in the immediate postpartum period and women who accepted immediate postpartum IUD insertion of sterilization were recruited as a control group. Complete 18-month followup results were obtained for 108 DMPA and 106 control fluke-positive subjects and for 89 DMPA and 74 fluke-negative subjects. No woman in any of the groups developed signs or symptoms of hepatic disease and the DMPA users had fewer health-related complaints during followup than the control subjects. Over 80% of both groups of users were amenorrheic 18 months postpartum, compared with about 15% of those in the control group. A large majority of subjects in each group continued to breastfeed for the entire study period without complaint. Weight change was small and similar in both the DMPA and control groups. Total bilirubin, aspartate aminotransferase, alanine aminotransferase, dehydrogenase, and alkaline phosphatase levels at 6, 12, and 18 months in the DMPA groups were generally equivalent to or lower than those in the corresponding control groups. Cholesterol levels were significantly decreased in the fluke-positive DMPA subjects while serum triglycerides were significantly decreased in both DMPA groups compared with their controls throughout the followup period. We conclude that during 18 months of use, DMPA did not cause any deleterious effects on health or on the metabolic factors studied in women with and without liver fluke infestation.
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PMID:Effects of the injectable contraceptive depot medroxyprogesterone acetate in Thai women with liver fluke infestation: final results. 16 23

Humans are exposed to a number of toxic elements in the environment; however, most experiments with laboratory animals investigate only one toxic element. To determine if concomitant exposure to lead (Pb), cadmium (Cd), and/or arsenic (As) modified the changes produced by any one metal in various parameters of toxicity, 168 male, Sprague-Dawley, young adult rats were fed nutritionally adequate diets to which had been added 0 or 200 ppm Pb as Pb acetate, or 50 ppm Cd as Cd chloride, or 50 ppm As as sodium arsenate or arsanilic acid in a factorial design for a period of 10 weeks. At these concentrations, Cd and As reduced weight gain even when differences in food intake were taken into account; administration of both Cd and As depressed weight gain more than did either metal alone. Pb did not adversely affect food consumption or weight gain. Increased numbers of red blood cells (RBCs) were observed following administration of Pb, Cd, or As; usually more cells were observed when two or three metals were administered, compared to individual metals. Despite increasing numbers of circulating RBCs, hemoglobin and hematocrit were reduced, especially with the Pb-Cd combination and the Cd-arsanilic acid combination. Specific effects of Pb on heme synthesis were observed, including increased urinary excretion of delta-aminolevulinic acid; this increase was reduced by the presence of dietary cadmium. Analyses of blood showed values for the laboratory rat within normal ranges for blood urea nitrogen, creatinine, cholesterol, calcium, albumin, total protein, and bilirubin. Uric acid was increased by Pb, with little modification by dietary Cd or As content. Serum glutamate-oxalate transaminase activity was reduced by As. Serum alkaline phosphatase was greatly reduced by either As or Cd but not Pb. Combinations of As and Cd did not further reduce the activity of this enzyme. Kidney weight and kidney weight/body weight ratios were increased by Pb alone, with no effects of Cd or As alone or as interactions. Liver weight/body weight ratios were reduced in animals fed 50 ppm dietary Cd. Kidney histology shows predominantly Pb effects, namely, intranuclear inclusion bodies and cloudy swelling. Ultrastructural evaluation of kidneys from Pb-treated animals disclosed nuclear inclusion bodies of the usual morphology and mitochondrial swelling. Concurrent administration of Cd greatly minimized Pb effects on the kidney under conditions of this experiment. Liver histology suggests an increased rate of cell turnover with either As compound, but few specific changes.
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PMID:Effects of concurrent administration of lead, cadmium, and arsenic in the rat. 19 3

Aspartate aminotransferase (EC 2.6.1.1) activity and the distribution of its isoenzymes in human liver were examined. Rabbit antiserum against porcin soluble (i.e., non-mitochondrial) enzyme cross-reacted with the soluble enzyme of human origin and was used in an immunoprecipitation assay to quantitate the soluble and mitochondrial isoenzymes. These were separated by rapid, semiquantitative electrophoresis on cellulose acetate and by three other quantitative techniques: isoelectric focusing and anion-and cation-exchange chromatography. The mitochrondrial enzyme averaged 81% of the total activity in normal adult human liver (n = 4). Its contribution was dramatically reduced in single specimens of human fetal liver (56% of total activity) and hepatoblastoma tissue (38%). Total enzyme activities (mumol min-1 per gram of tissue) were: adult, 150; fetal, 38; tumor, 6. Total enzyme concentrations (micromoles of enzyme per kilogram of tissue) found were: adult, 10.8; fetal, 2.7; tumor, 0.4. The concentrations and isoenzyme distribution in human liver are compared to those in various animal model systems. Other methods for quantitative estimation of the isoenzymes and their adaptability for use in estimating concentrations in serum are reviewed.
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PMID:Aspartate aminotransferase activity and isoenzyme proportions in human liver tissues. 21 6

1 Daily ethinyloestradiol (50 mug) and norethisterone acetate (1 mg) treatment (Minovlar) was investigated on gastric acid and pepsin secretion, and fasting serum gastrin concentration in six conscious female cats prepared with chronic gastric fistulae. The effect on biliary secretion of bile acids, phospholipids, and cholesterol was investigated in three conscious female cats prepared with chronic gastric and intestinal fistulae, and cholecystectomy.2 Treatment for 49 days did not alter the gastric acid or pepsin response to either intravenous pentagastrin infusions or a food stimulus. The fasting serum gastrin concentration remained unaltered throughout the study.3 Treatment for 18 days did not alter the percentage concentration of cholesterol in the bile, but reduced the percentage concentration of phospholipid. This was mirrored by a rise in the percentage concentration of bile acids in the bile. These trends were quickly reversed on cessation of treatment.4 There was no sign of cholestasis associated with the treatment. Intestinal flow remained constant throughout the study, there was no lithocholic acid or other abnormal bile acids detectable in any samples, and there was no change in serum aspartate aminotransferase concentration.5 The results suggest that in female cats, treatment with a combined oestrogen-progestin preparation does not exert any beneficial effects on the aetiology of peptic ulceration through the reduction of acid or pepsin secretion, or the lowering of serum gastrin concentration. The preparation shows a tendency to produce more lithogenic bile, and this may partly explain the greater incidence of gall stones in women on the contraceptive pill.
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PMID:Effects of a combined oestrogen-progestin preparation on gastric acid and pepsin secretion, serum gastrin concentration and biliary secretion of bile acids, phospholipids, and cholesterol in the cat. 36 77

We measured creatine kinase (EC 2.7.3.2) activity in 1009 serum samples from 538 patients in the intensive-care units of the University of Texas Medical Branch hospitals. Creatine kinase isoenzymes migrating cathodal to skeletal muscle creatine kinase (CK-MM) on cellulose acetate electrophoresis were found in sera from 14 of the 538 patients. Creatine kinase, lactate dehydrogenase (EC 1.1.1.27), aspartate aminotransferase (EC 2.6.1.1), and alanine aminotransferase (EC 2.6.1.2) activities were abnormally increased in these 14 patients. Liver lactate dehydrogenase isoenzyme (LDH5) and cardiac creatine kinase isoenzyme (CK-MB) were abnormally increased in 12 and eight of these patients, respectively. Ten of the 14 patients died during their hospital admission. We believe the creatine kinase isoenzymes that migrated cathodal to skeletal muscle creatine kinase (CK-MM) were of mitochondrial origin.
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PMID:Creatine kinase isoenzymes of mitochondrial origin in human serum. 44 29

Isocitrate lyase (EC 4.1.3.1) and malate synthase (EC 4.1.3.2), the two enzymes characteristic of the glyoxylate cycle, were demonstrated in promastigotes of five species of Leishmania (L. brasiliensis, L. donovani, L. mexicana, L. tarentolae, and L. tropica). Both enzymes were present in cells grown in a medium containing 10 mM glucose. Substitution of glucose with 20 mM acetate did not enhance enzyme levels. Acetate was readily taken up and metabolized by the cells. The distribution of label from acetate into various intermediary metabolites indicates a functional glyoxylate cycle and its role in gluconeogenesis/glyconeogenesis. The glyoxylate cycle in conjunction with alanine-glyoxylate aminotransferase and glyoxylate-aspartate aminotransferase could also be important in providing glyoxylate, the precursor for glycine biosynthesis.
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PMID:Evidence for a functional glyoxylate cycle in the leishmaniae. 69 79

Glutamate-auxotrophic mutants lacking phosphoenolpyruvate carboxylase(PC), citrate synthase (CS) or glutamate dehydrogenase (GD), an aspartate auxotroph lacking aspartate aminotransferase (TA), and a glutamate-aspartate double auxotroph lacking both aconitase (AH) and TA were obtained from Brevibacterium flavum No. 2247, a glutamate-producing bacterium. Prototrophic revertants further derived from the CS- and GD-lacking auxotrophs concomitantly recovered the enzyme activities that their parents had lost. These results indicate involvement of the tricarboxylic acid (TCA) cycle and GD in glutamate biosynthesis, that of PC in the biosynthesis of the TCA cycle intermediates and that of TA in aspartate biosynthesis. The CS-deficient mutants accumulated large amounts of acetate and small amounts of pyruvate, aspartate and alanine, while the GD-deficient strains accumulated large amounts of 2-oxo-glutarate and small amounts of citrate. Synthesis of PC was repressed by either glutamate or aspartate and those of CS and GD were repressed by glutamate, whereas those of pyruvate dehydrogenase (PD), AH, and isocitrate dehydrogenase were not affected significantly by glutamate; that of TA was also not affected by aspartate or by glutamate. The specific activities of PD and AH gave peaks during the cellular cultivation, related to the temporary accumulation of their substrates, pyruvate and citrate, respectively. These and previous results on the regulation of the enzymatic activities provide a definite regulatory mechanism for glutamate and aspartate syntheses.
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PMID:Enzymes of the glutamate and aspartate synthetic pathways in a glutamate-producing bacterium, Brevibacterium flavum. 72 99

The rate of biniding of pyridoxal phosphate to the apoenzyme of pig heart cytoplasmic aspartate aminotransferase (L-aspartate: 2-oxoglutarate aminotransferase, EC 2.6.1.1) was measured by adsorption spectroscopy and by formation of active enzyme. At pH 5.1 and 8.3 the binding of coenzyme follows saturation kinetics. The binding process thus involves at least two steps. The rate of pyridoxal phosphate binding to the apoenzyme is dependent on the anion present in the pH 8.3 triethanolamine buffer. Chloride activates somewhat at very low concentrations. Phosphate and its methyl, ethyl, and phenyl esters are very effective inhibitors of the recombination in that 0.2--0.4 mM inhibit the rate of coenzyme binding by 50%. This is below the physiological concentration of phosphate. Sulfate also inhibits the rate of binding, but nitrate and acetate have little effect.
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PMID:The interaction of pyridoxal phosphate with aspartate apoaminotransferase. 94 61

Multiple forms of aspartate transaminase from cytosol of pig heart (alpha, beta and psi) were incubated in 0.05 M acetate buffer, pH 5.0 at 4 degrees within 5 and 8 months. Gradual accumulation of denaturated forms was observed on incubation of alpha- and beta-forms; these forms possessed higher mobility in polyacrylamide gel disc electrophoresis and decreased enzymatic activity as compared with the native forms. Multiple forms, produced during ageing of alpha-form, were separated by chromatography on CM-cellulose. Chromatographic resolution of the forms, their activity and spectral properties suggest that they are not identical with the native isoenzymes found in the cell.
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PMID:[Native and artificial sub-forms of cytoplasmic aspartate transaminase from swine heart]. 101 76


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