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At least 181 records · Page 10Linked to original sources
PubMed1982

Effect of different extenders on glutamic oxalacetic transaminase (GOT) and glutamic pyruvic transaminase (GPT) release from frozen buffalo semen.

Sixty buffalo semen samples (motility greater than 60%) were frozen in 3 extenders, viz., Tris yolk glycerol (TY-G), Citric acid whey glycerol (CAW-G) and Egg yolk glucose sodium bicarbonate glycerol (EYGSB-G) for studying the release of GOT and GPT enzymes in the extracellular fluid during pre-freezing (after first extension) and post-freezing (15 minutes and 30 days after freezing). Release of GOT and GPT enzymes was less in TY-G than CAW-G and EYGSB-G extenders. Significant differences (P<0.01) in GOT and GPT release were observed between extenders and bulls at various stages of freezing of semen.

Journal Article↗
PubMed1983

Inhibition of glutamate-aspartate transaminase by beta-methylene-DL-aspartate.

beta-Methylene-DL-aspartate, a new beta, gamma-unsaturated amino acid, is an irreversible inhibitor of soluble pig heart glutamate-aspartate transaminase (Ki approximately 3 mM with respect to the L-form; limiting rate constant for inactivation approximately 0.4 min-1). The new amino acid is the most specific inhibitor of glutamate-aspartate transaminase thus far studied. It does not inactivate pig heart glutamate-alanine transaminase, soluble rat kidney glutamine transaminase K, gamma-aminobutyrate transaminase (from Pseudomonas fluorescens), glutamate decarboxylase (Escherichia coli), snake venom L-amino acid oxidase, or hog kidney D-amino acid oxidase. In addition, the following enzymes were not inhibited by beta-methylene-DL-aspartate in rat tissue homogenates: gamma-aminobutyrate transaminase (brain), tyrosine transaminase (liver), glutamine transaminase L (liver), asparagine, transaminase (liver), ornithine transaminase (liver) or branch-chain transaminase(s) (kidney). Intraperitoneal injection of beta-methylene-DL-aspartate into mice decreased kidney and liver glutamate-aspartate transaminase activities but had no effect on liver glutamate-alanine transaminase activity.

Amino Acid Oxidoreductases↗
PubMedDate not supplied

Persistently normal alanine transaminase levels in chronic C hepatitis: what does it tell us?

BACKGROUND/AIMS: We evaluated the demographic, clinical, histological and serological characteristics of chronic hepatitis C infection with persistently normal serum alanine transaminase levels and compared the results with those obtained in a group of chronic hepatitis C infection with serum alanine transaminase levels above normal. METHODOLOGY: Twenty-one patients who had chronic hepatitis C infection with normal alanine transaminase during the follow-up period and 34 patients who had chronic C infection with serum alanine transaminase levels above normal were included in this study. Demographic, clinical, histological and serological parameters of these two groups were evaluated. RESULTS: There were no significant differences in age, gender, known route of infection, viral load and genotype distribution between the two groups (P > 0.05). The gamma-glutamyltransferase and gamma-globulin levels were significantly higher in the serum alanine transaminase levels above normal group (P < 0.01 and P < 0.05). Among the patients with normal alanine transaminase, liver biopsy findings were normal in eight patients (38%). None of the patients with serum alanine transaminase levels above normal had normal liver biopsy findings. Histologic activity index was significantly higher in serum alanine transaminase levels above normal group (9.7 +/- 2.2 vs. 6.4 +/- 1.9; P < 0.001). Histologic activity index and alanine transaminase levels correlate with the stage of the disease (P < 0.05). CONCLUSIONS: For a definite diagnosis in patients with HCV-RNA+ and normal alanine transaminase liver biopsy is necessary and significant liver disease may be present in such patients irrespective of viral load, genotype and alanine transaminase levels.

Adult↗
PubMed1974

Purification and properties of dolphin muscle aspartate and alanine transaminases and thier possible roles in the energy metabolism of diving mammals.

1. Mitochondrial and supernatant aspartate transaminases (EC 2.6.1.1) and supernatant alanine transaminase (EC 2.6.1.2) were purified 89-, 204- and 240-fold respectively, from dolphin muscle. Starch-gel electrophoresis of crude and purified preparations revealed that all three enzymes exist as single forms. 2. K(m) values of alpha-oxoglutarate, alanine, pyruvate and glutamate for the alanine transaminase were 0.45, 8.2, 0.87 and 15mm respectively. For the aspartate transaminases, the K(m) values of alpha-oxoglutarate, aspartate, oxalacetate and glutamate were 0.76, 0.50, 0.10 and 9.4mm respectively, for the mitochondrial form and 0.13, 2.4, 0.06 and 3.2mm respectively, for the supernatant form. 3. In all cases, as the assay pH value was decreased from pH7.3, the K(m) values of the alpha-oxo acids decreased whereas those of the amino acids increased. 4. The apparent equilibrium constants for the aspartate transaminases were independent of pH. These values were 9.2 and 6.8 for the mitochondrial and supernatant forms respectively, where [Formula: see text] 5. Studies of the inhibition of the aspartate transaminases by dicarboxylic acids indicated that these enzymes may be controlled by pools of metabolic intermediates. 6. Three key roles are suggested for the transaminases in the energy metabolism of the diving animal. First, it is believed that a combined action of the transaminases could enhance energy production during hypoxia by providing (a) fumarate from aspartate for the ATP-producing reversal of succinate dehydrogenase, and (b) alpha-oxoglutarate from glutamate for the GTP-producing succinyl thiokinase reaction. Secondly, diving mammals probably accumulate more NADH than other mammals during hypoxia. The aspartate transaminases seem particularly well suited for restoring and maintaining redox balance via the malate-aspartate cycle after aerobic metabolism is resumed. Finally, since the preferred fuel for aerobic work is fat, the combined reactions of the transaminases could be instrumental in providing increased supplies of oxaloacetate for sparking the tricarboxylic acid cycle.

Alanine Transaminase↗
PubMed2006

Elevated transaminases during medical treatment of acromegaly: a review of the German pegvisomant surveillance experience and a report of a patient with histologically proven chronic mild active hepatitis.

OBJECTIVE: The new GH receptor antagonist pegvisomant is the most effective medical therapy to normalize IGF-I levels in patients with acromegaly. Based on currently available data pegvisomant is well tolerated; however, treatment-induced elevation of transaminases has been reported and led to the necessity for drug discontinuation in some patients in the pivotal studies. The aim of this study was to evaluate and characterize the prevalence of elevated transaminases and to describe in detail the findings in a single case who required drug discontinuation because of elevation of transaminases which emerged during treatment and who underwent liver biopsy. DESIGN AND METHODS: Retrospective safety analyses were carried out on 142 patients with acromegaly receiving pegvisomant treatment in Germany between March 2003 and the end of 2004. Of these patients, 123 were documented in a post-marketing surveillance study, one case of elevated transaminases was reported spontaneously and the other patients were treated in a clinical study. RESULTS: Mean treatment duration with pegvisomant in the ongoing observational study at the end of 2004 was 28.3 +/- 19.9 (S.D.) weeks. Twelve out of the 142 patients had elevated transaminases above three times the upper limit of normal, likely caused by biliary obstruction in five of the patients. All patients but one affected by elevated transaminases had been previously treated with somatostatin analogues. In six out of 142 (4%) of patients, pegvisomant was permanently withdrawn because of elevated transaminases. The same number of patients showed a transient increase of transaminases with either spontaneous remission without dose modification (n = 4) or no re-increase of transaminases after temporary discontinuation and re-exposure (n = 2). The liver biopsy of one patient who was permanently withdrawn showed a chronic mild hepatitis with a mixed portal inflammation including eosinophilic granulocytes. CONCLUSIONS: Liver function tests should be regularly followed on pegvisomant treatment. Biliary complications, which may arise from restitution of normal gall bladder motility after cessation of somatostatin analogue treatment, need to be differentiated from pegvisomant-induced abnormalities. The histological pattern of the liver biopsy performed in one of the patients showed a mild chronic active hepatitis. The lack of dose dependency and rather low frequency of elevated transaminases in those cases where a biliary disorder was excluded render this reaction an idiosyncratic drug toxicity.

Acromegaly↗
PubMed1993

[Changes in transaminase before and after tonsillectomy].

Almost all patients who undergo palatine tonsillectomy for chronic tonsillitis and/or tonsillar hypertrophy manifest postoperative changes in their condition and laboratory data. In some patients, high preoperative transaminase levels decrease postoperatively. I studied 17 patients who had abnormal serum transaminase levels 10 days before tonsillectomy. Before tonsillectomy, serum glutamate oxaloacetate transaminase (GOT) levels were abnormal in half and serum glutamate pyruvate transaminase (GPT) were abnormal in all. Before operation, laboratory values of serum GPT were higher than those of serum GOT in all 17 patients. After tonsillectomy, the abnormal GOT levels in all patients gradually improved to the normal range before the 11th postoperative day and GPT levels did so before the 25th day. Measurement of intracellular transaminase activity of the palatine tonsil suggested that the migration of intracellular transaminase from tonsillar cells to serum would not elevate the serum transaminase level. Postoperative changes in serum transaminase and serum cholinesterase were different from the recovery process observed in fatty liver. The high transaminase level observed in patients with tonsillectomy is suspected to be due to other organs, rather than continuous inflammation of the palatine tonsil.

Adult↗
PubMed2004

Transaminase levels in ventilated children with respiratory syncytial virus bronchiolitis.

OBJECTIVES: To compare disease severity as judged by duration of ventilation, inotrope use and mortality in children ventilated for respiratory syncytial virus (RSV)-positive lower respiratory tract infection (LRTI) with and without elevated transaminase levels and to determine the aetiology of elevated transaminase levels in this patient group. DESIGN: Prospective observational study. SETTING: Twenty-two-bed Paediatric Intensive Care Unit. PATIENTS: Forty-eight ventilated children with RSV-positive LRTI. MEASUREMENTS AND RESULTS: Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels were measured daily. In patients with elevated transaminase levels infection with the following viruses was investigated: hepatitis A, B and C viruses, cytomegalovirus, Epstein Barr virus, adenovirus, influenza virus, and parainfluenza viruses (types I, II, and III). Elevated transaminase levels were detected in 22 (46%) patients. The duration of mechanical ventilation (geometric mean; 95% CI) was significantly ( P<0.05) longer in the group with elevated transaminase levels: 10.6 (9.4; 11.7) days versus 3.5 (2.8; 4.2) days. This difference remained significant in patients without congenital heart disease. Inotrope use was more common and all deaths occurred in the group with elevated transaminase levels ( P<0.05). All patients who died and all but two patients with inotrope requirements had underlying congenital heart disease. One patient with elevated transaminase levels had a simultaneous infection with influenza A virus. CONCLUSIONS: RSV disease in ventilated children was more severe if transaminase levels were elevated. Transaminase level elevation was due to hepatitis in the majority of patients. In patients with congenital heart disease we also detected myocardial involvement.

Alanine Transaminase↗