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)

Minimal liver damage was induced in groups of rats by the administration of three toxicants, viz. carbon tetrachloride, sodium phenobarbitone and orotic acid. Serial blood samples were taken from the animals during the course of the experiment and the plasma levels of a number of enzymes, substrates and metabolites were measured. Liver and kidney samples were also taken at appropriate times after dosing and examined histologically for evidence of drug induced damage. The results of the experiment show that (I) no single test gave unequivocal evidence of liver damage for all three compounds, (II) the conventional liver function tests, alanine transaminase, aspartate transaminase, and alkaline phosphatase, whose plasma activities are usually reported in toxicity studies, were not the most sensitive indicators of the minimal liver cell damage caused by the drugs used in this experiment, (III) knowledge of the intracellular location of the diagnostic enzyme makes it possible to describe, at least in part, the nature of the changes within the liver, (IV) measurement of plasma cholesterol and triglyceride levels can provide information about disruption in lipid metabolism, (V) the times at which blood samples are taken are most important if transient drug effects on the liver are to be detected.
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PMID:Young Scientists Award Lecture 1977: An investigation into the value of some clinical biochemical tests in the detection of minimal changes in liver morphology and function in the rat. 27 87

A safety evaluation of Aspergillus fumigatus I21, grown in a cassava carbohydrate and salts medium, was undertaken. Male weanling rats were fed the fungus at 20, 30 and 40% of the diet for 90 days. A control group was given soybean oil meal as the sole source of protein. Weekly determinations of the body weights and feed consumptions were made. A few days prior to termination of the feeding study, a kidney function test was undertaken on the rats. At the end of the feeding period hematology, blood biochemistry, urine analyses and histopathology studies of various tissues were carried out, and organs were weighed. Rats fed A. fumigatus I21 gained less weight than the controls, but kidney weights were increased. Increases in serum alkaline phosphatase and glutamic-oxaloacetic transaminase were not related to dose level. The blood urea nitrogen was increased for the rats fed 40% of the fungus. Rats fed 30 and 40% of the fungus I21 showed a significant drop in albumin. Deficiency in methionine or other essential amino acids through a limited feed consumption may have caused a decrease in albumin synthesis. Rats fed the highest level of the fungus showed increases in neutrophils and monocytes concomitant with decreases in lymphocytes and eosinophils which may be a response to stress. The urine analyses did not reveal any significant differences. The test rats were capable of concentrating urine adequately when deprived of water for 24 hours. No significant differences between the control and experimental groups were found by histopathological examinations.
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PMID:Safety evaluation of Aspergillus fumigatus grown on cassava for use as an animal feed. 33 62

We used the previously described [Clin. Chem. 19, 1114 (1973)] and evaluated [Clin. Chem. 19, 1122 (1973)] computer-controlled instrument system for sequential chemical testing to select and perform tests of hepatic status, to aid the clinician in the diagnosis of liver disease. Results for total bilirubin, aspartate aminotransferase, and alkaline phosphatase obtained from the continuous-flow analysis (SMA 12/60) admission screen were used by the instrument system to determine selectively the values for gamma-glutamyltransferase, alanine aminotransferase, creatine kinase, and total and direct bilirubin. Kit methods for the latter four tests were evaluated on the system; results were similar to manual procedures. A software, enzymatic ratemeter was found to be better than the previously described hardware ratemeter. The follow-up tests of serum prescribed by the system are compared to clinician-prescribed follow-up tests and discharge diagnoses. In 10 of 19 cases, the system and clinician ordered similar follow-up tests; in three cases follow-up differed, and in six cases, the system ordered follow-up tests and the clinician ordered none.
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PMID:Computer-controlled instrument system for sequential chemical testing III. Application to liver assessment. 34 61

Thirty-one patients with severe gram-negative bacterial infections were treated successfully with a combination of cefamandole nafate plus gentamicin or tobramycin. The patients were divided into two treatment groups: group 1 received low-dose therapy (80--100 mg of cefamandole nafate/kg per 24 hr plus 3 mg of either gentamicin or tobramycin/kg per 24 hr), and group 2 patients, who had suspected bacteremia, received high-dose therapy (170 mg of cefamandole nafate/kg per 24 hr plus 5 mg of either gentamicin or tobramycin/kg per 24 hr). All of the patients were clinically and bacteriologically cured of their primary infections. All four episodes of bacteremia were cleared within 24 hr after therapy was initiated. There was a uniform decrease in the rate of creatinine clearance which was slightly greater in group 2 patients; however, all creatinine clearance values were within the normal range and actually improved during therapy. There was no difference between the clearance values of the tobramycin-treated patients and gentamicin-treated patients. A few transient abnormalities in results of liver function tests occurred during the study. In one patient whose serum was positive for hepatitis-associated antigen, the alkaline phosphatase, aspartate aminotransferase, and bilirubin values were elevated on admisssion of the patient to the hospital, increased fivefold during therapy, and decreased to the base-line admission values six days after therapy; however, it is difficult to establish that this reaction was antibiotic-induced hepatic toxicity.
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PMID:Efficacy and safety of cefamandole plus either gentamicin or tobramycin in therapy of severe gram-negative bacterial infections. 34 93

Hepatic function of 80 children aged under 3 years with Plasmodium vivax malaria were studied during the acute attack and 6 weeks after antimalarial treatment. Raised levels of serum aspartate transaminase (serum AST; SGOT), serum alanine transaminase (serum ALT; SGPT), and alkaline phosphatase were observed in 68%, 39% and 46% of cases respectively. AST levels were higher than ALT ones and the mean level of both enzymes was much higher in patients with hepatomegaly. The hepatic dysfunction which these observations reflect is transient, as these enzymes were found to be at their normal levels 6 weeks after treatment. A transient derangement of liver function is thus a common feature of childhood malaria, and hepatic dysfunction takes place to a significant degree even in P. vivax malaria.
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PMID:Hepatic dysfunction in childhood malaria. 37 43

Forty-two consecutive patients were observed with the use of various biochemical and physiologic parameters. Attention was focused upon liver function, using serum glutamic-oxalacetic transaminase, alkaline phosphatase and bilirubin determinations as well as the plasma disappearance rate of indocyanine green. No difference was noted in serum glutamic-oxalacetic transaminase, alkaline phosphatase and bilirubin levels between survivors and nonsurvivors. However, there was a significant difference between these two groups as measured by the plasma disappearance rate of indocyanine green. A distinct cut-off point was present, and no survivor ever had a plasma disappearance rate of less than 6 per cent per minute.
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PMID:Indocyanine green clearance in critically ill patients. 38 3

Serial liver enzyme and bilirubin concentrations were measured in 100 patients undergoing total parenteral nutrition. Between the eighth and tenth days, serum glutamic-pyruvic transaminase levels rose to 5.4 times pretotal parenteral nutrition levels; serum glutamic-oxalacetic transaminase, 2.8 times; bilirubin, 2.3 times, and lactic dehydrogenase, 1.5 times. These elevations were transient, lasting four to ten days. Biopsies of the liver taken during maximal elevations demonstrated marked periportal fatty change. A second elevation of serum glutamic-pyruvic transaminase, serum glutamic-oxalacetic transaminase, alkaline phosphatase and lactic dehydrogenase occurred in one-third to one-half of those patients receiving total parenteral nutrition for longer than a 20 day period. These elevations were more prolonged, and no biopsies were taken. Amino acid solutions contain conversion products of tryptophan, an amino acid that is unstable in the presence of the preservative sodium bisulfite which is added to all commercially available protein solutions. Infusion of these products into rats, either alone or as part of total parenteral nutrition solutions, resulted in periportal fatty change of the livers identical to that seen in our patients receiving total parenteral nutrition. A toxic effect of tryptophan conversion products in total parenteral nutrition solutions is proposed.
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PMID:Serum hepatic enzyme and bilirubin elevations during parenteral nutrition. 40 35

This article discusses the effects of Fructus Gardeniae extract on hepatic function. Fructus Gardeniae extract manifested no hepatotoxic effects on rats, as shown by alkaline phosphatase, aspartate aminotransferase, and lactate dehydrogenase studies. Fructus Gardeniae extract failed to activate the UDP-glucuronyltransferase system; whereas in hyperbilirubinemic state the enzyme was activated, presumably by substrate induction. Fructus Gardeniae extract increased the activity of UDP-glucose dehydrogenase, which would result in an increase in availability of UDP-glucuronic acid intracellularly, BSP clearance study showed an unexpected impairment of hepatic uptake of the dye after extract treatment. The action mechanism involved in lowering of serum bilirubin level by Fructus Gardeniae extract may well be complex; it is probably acting on a locus other than glucuronyl transferase.
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PMID:Effects of Fructus gardeniae extract on hepatic function. 41 32

Low turbidity, "clear" enzyme controls commercially produced in three concentrations and conventional human lyophilized control sera, which are more turbid, were evaluated to determine which was superior for quality control purposes. Criteria used to evaluate the controls were: 1) turbidity measurement, 2) daily assays for 30 days to estimate day-to-day precision, and 3) stability of the enzyme assay value for these controls when they were reconstituted and frozen for 0 to 30 days and 0 to 10 days with three aliquots separately prepared and frozen for 0 to 10 days for a total of 30 days. The controls were analyzed for lactate dehydrogenase, alanine aminotransferase, aspartate aminotransferase, creatine kinase, and alkaline phosphatase activities with the Perkin-Elmer KA 150 enzyme analyzer.
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PMID:The use of "clear" enzyme control materials. 42 91

The effects of three widely spaced levels of bacterial contamination of reagent water on several chemistry, radioimmunoassay, and coagulation procedures were studied. These included determinations of lactate dehydrogenase, creatine kinase, aspartate transaminase, alkaline phosphatase, blood urea nitrogen, total protein, thyroid-stimulating hormone, digoxin, thrombin time, activated partial thromboplastin time, and prothrombin time. Statistical analyses included calculations of means and coefficients of variation, and analysis of variance, as well as correlation coefficients for test results versus logarithm of bacterial contamination. Statistically and clinically significant differences occurred together only for an elevated level of creatine kinase.
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PMID:Effects of bacterial contamination of reagent water on selected laboratory tests. 43 36


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