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At least 19 recordsLinked to original sources
PubMed1983

Late phase of liver restoration following partial hepatectomy in phenobarbital-treated rats. II. Effect of phenobarbital on aspartate aminotransferase, alanine aminotransferase, glutamate dehydrogenase, and UDP-glucuronyltransferase activity.

Rats were treated with 50 mg phenobarbital (PB) per kg body weight for 7 days prior to or after partial hepatectomy. The activities of aspartate aminotransferase, alanine aminotransferase, and glutamate dehydrogenase were measured in the regenerating liver 1 week following liver amputation. UDP-glucuronyl transferase activity was determined at the time of surgery as well as 7 days later at the time of death. Alanine aminotransferase was induced by PB in rats only treated in the postoperative period, while aspartate aminotransferase and glutamate dehydrogenase were not. The activity of UDP-glucuronyl transferase was increased more than twofold by repeated PB treatment in both normal and regenerating liver. After cessation of therapy, however, the enhanced activities returned to a normal level. It is concluded that UDP-glucuronyl transferase activity in regenerating liver is as inducible as in normal rat liver by repeated PB treatment despite incomplete hepatic regeneration. Preoperative PB treatment alone is not sufficient to stimulate the glucuronylating pathway in the late phase of liver regeneration.

Alanine Transaminase↗
PubMed2003

Validity and clinical utility of the aspartate aminotransferase-alanine aminotransferase ratio in assessing disease severity and prognosis in patients with hepatitis C virus-related chronic liver disease.

BACKGROUND: The aspartate aminotransferase-alanine aminotransferase ratio (AST/ALT ratio) has been used to noninvasively assess the severity of disease in patients with chronic liver disease (CLD). We previously demonstrated that progressive liver functional impairment is associated with an increase in the AST/ALT ratio. OBJECTIVES: To evaluate the reproducibility and transportability of the AST/ALT ratio in a large cohort of patients with different degrees of hepatitis C virus (HCV)-related CLD, to confirm the correlation between progressive impairment of liver function and increase in the AST/ALT ratio, to evaluate whether diagnostic accuracy of the ALT/AST ratio can be improved by using it with other biochemical variables, and to assess the 1-year prognostic capability of the AST/ALT ratio in patients with liver cirrhosis. PATIENTS AND METHODS: We retrospectively evaluated 252 patients with HCV-related CLD. The AST/ALT ratio was correlated with the degree of liver fibrosis in patients with chronic hepatitis and with the Child-Pugh score in patients with cirrhosis. All patients had undergone monoethylglycinexylidide (MEGX) testing to evaluate liver function. We assessed the prognostic ability of the AST/ALT ratio in a subset of 63 cirrhotic patients who were followed up for at least 1 year. RESULTS: The AST/ALT ratio was more frequently 1 or higher in cirrhotic patients (P<.001). There was a significant correlation between MEGX values and the AST/ALT ratio (r(s) = -0.621, P<.001). Multivariate stepwise logistic analysis showed that AST/ALT ratio, platelet count (PLT), MEGX values, and prothrombin activity were independently associated with the presence of cirrhosis. Combined assessment of the AST/ALT ratio and/or PLT obtained 97.0% positive predictive value and 97.9% negative predictive value for the diagnosis of cirrhosis. The AST/ALT ratio had 81.3% sensitivity and 55.3% specificity in identifying cirrhotic patients who died within 1-year of follow-up. CONCLUSIONS: The AST/ALT ratio is both reproducible and transportable in patients with HCV-related CLD. The AST/ALT ratio is correlated with both histologic stage and clinical evaluation. Progressive liver functional impairment is reflected by an increase in the AST/ALT ratio. Noninvasive evaluation by means of the combined AST/ALT ratio and PLT assessment misclassifies only a few cirrhotic patients. In cirrhotic patients, the AST/ALT ratio provides medium-term prognostic information that is no different from that provided by established prognostic scores.

Alanine Transaminase↗
PubMed1988

The influence of long-term anticonvulsant therapy with diphenylhydantoin and carbamazepine on serum gamma-glutamyltransferase, aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase.

In 110 patients receiving long-term anti-convulsant monotherapy with diphenylhydantoin (DPH) and carbamazepine (CBZ) the serum activities of gamma-glutamyltransferase (gamma-GT), aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase (AP) were examined retrospectively. Elevated serum levels of gamma-GT and AP were seen in 91% and 39% of patients receiving DPH therapy compared to 64% and 14% of those receiving CBZ treatment. With all enzymes evaluated increases were more frequent and higher with DPH treatment than with CBZ. Frequency and extent of increased activity of gamma-GT were highly related to daily dosage in both preparations. The proportion of pathological enzyme levels was associated with age in DPH and CBZ therapies but not found to be significant. Sex differences in the frequency of increased enzyme activities could not be demonstrated. The results are discussed in the context of induction of the cytochrome P-450 system.

Adult↗
PubMedDate not supplied

Milk fever in the cow--course of disease in relation to the serum activity of aspartate aminotransferase, alanine aminotransferase, creatine kinase and gamma-glutamyltransferase.

The serum activity of aspartate aminotransferase (ASAT), alanine aminotransferase (ALAT), creatine kinase (CK), and gamma-glutamyltransferase (GGT) was determined at the time of first and subsequent treatments in milk fever cows which responded differently to treatment, and in a number of healthy, periparturient cows. Serum ASAT, ALAT and CK levels were lower in the healthy cows than in the milk fever cows at first treatment. Serum ASAT and serum CK were, at first treatment, higher in the milk fever cows which did not recover than in those which recovered. At second and subsequent treatments, serum ASAT and serum ALAT were higher in the cows which failed to recover, and these cows also showed the highest levels of serum CK up-to and including fourth treatment. After an overall assessment of serum activity of the various enzymes, it is concluded that muscle damage was a significant complication both in cows which recovered and in those which failed to recover, while liver damage was of little importance.

Alanine Transaminase↗
PubMed2000

Aspartate aminotransferase: alanine aminotransferase ratio in chronic hepatitis C infection: is it a useful predictor of cirrhosis?

BACKGROUND: The clinical usefulness of the ratio of serum aspartate aminotransferase (AST) to alanine aminotransferase (ALT) has been explored in several liver disorders. It has been suggested that in patients with chronic hepatitis C virus (HCV) infection an AST:ALT > or = 1 has 100% specificity and positive predictive value in distinguishing cirrhotic from non-cirrhotic patients. Such statistical certainty attached to a simple biochemical test merits further evaluation. The present study, therefore, assessed the AST:ALT in patients with chronic HCV infection to determine the validity of the ratio in predicting cirrhosis and to correlate the ratio with the histological grade of necroinflammatory activity and fibrosis. METHODS: A retrospective analysis of 153 patients with chronic HCV infection was conducted. Serum biochemistry had been obtained within a mean of 4 weeks of liver biopsy. The histology was scored in terms of activity and fibrosis as described by Scheuer and correlated with AST:ALT. RESULTS: In 30 patients with cirrhosis, the mean AST:ALT (0.99 +/- 0.06) was higher than in 123 patients without cirrhosis (0.60 +/- 0.02; P < 0.001). A ratio > or = 1 had 95.9% specificity and 73.7% positive predictive value in distinguishing cirrhotic from non-cirrhotic patients, with a 46.7% sensitivity and 88.1% negative predictive value. The ratio also parallelled the Scheuer score with respect to fibrosis but not with respect to inflammation. CONCLUSION: Although relatively insensitive, an AST:ALT > or = 1 is highly specific but not diagnostic for the presence of cirrhosis in patients with chronic HCV infection. The ratio reflects the grade of fibrosis in these patients.

Adult↗
PubMed1992

Aspartate aminotransferase, alanine aminotransferase, and glutathione transferase in plasma during and after sedation by low-dose isoflurane or midazolam.

To assess the effect of prolonged administration of midazolam or isoflurane on hepatocellular integrity, we measured the concentrations of glutathione transferase (EC 2.5.1.18) B1 subunit and the activities of alanine aminotransferase (ALT; EC 2.6.1.2) and aspartate aminotransferase (AST; EC 2.6.1.1) in 40 patients who required long-term sedation with low-dose midazolam or isoflurane. Blood samples were collected before and 24 h after the start of the sedation and 0, 24, 72, 120, and 172 h after the last dose. ALT and AST activities did not change appreciably, but the glutathione transferase B1 concentration decreased significantly (P less than 0.03) at all times studied. The patients who received isoflurane and those who received midazolam showed no significant differences in any of the enzyme tests. We conclude that long-term sedation with midazolam or isoflurane is unlikely to affect hepatocellular integrity.

Adult↗
PubMed2006

Salivary aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase: possible markers in periodontal diseases?

BACKGROUND: Saliva can be used as a diagnostic fluid in medicine. Components of saliva proposed as disease markers include enzymes (alkaline phosphatase, esterase, glucuronidase, aminopeptidase), immunoglobulins (IgA, IgG), and hormones (steroid hormones). Many of these salivary components appeared to be useful biochemical markers of the evolution of periodontal disease, for which salivary analysis can offer a cost-effective approach for monitoring the disease. The salivary components proposed as markers for periodontal disease activity are aspartate aminotransferase (AST), alkaline phosphatase (ALP), aminopeptidases, and glucuronidases. The purpose of our study was to illustrate the influence of periodontal disease on the level of salivary AST, alanine aminotransferase (ALT) and ALP. METHODS: All clinical periodontal examinations were performed by the same periodontist. All patients included in the study presented a probing depth >5 mm, bleeding on probing and alveolar bone loss >40%. Salivary AST, ALT and ALP activities were measured using DiaSys analysis kits from Diagnostic Systems. The methods were adapted for saliva. RESULTS: Salivary AST activity in patients with periodontal disease was significantly increased (p<0.01) (median 81.75+/-23 U/L) compared with controls (15.25+/-10.5 U/L). Salivary ALT activity was not significantly modified in saliva from patients with periodontal disease compared with the control group. Our results showed a significant (p<0.01) increase in salivary ALP activity (34.38+/-1.5 U/L) in patients with periodontal disease compared with controls (6.6+/-4.2 U/L). CONCLUSIONS: Our results revealed that periodontal destruction such as periodontal pockets, gingival bleeding and suppuration are related to higher ALP and AST levels in saliva. Salivary AST could be used as a useful marker for monitoring periodontal disease. The increase in salivary ALP activity in periodontitis demonstrated could be associated with alveolar bone loss, a key feature of periodontal disease. More studies are necessary to evaluate which specific clinical, microbiological and histological characteristics of periodontal disease are associated with elevated levels of AST and ALP in saliva.

Adult↗
PubMed1988

[Altered gamma-glutamyltransferase, aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase serum activities in long-term anticonvulsive therapy--comparison of diphenylhydantoin and carbamazepine].

In 110 patients receiving a long-term anticonvulsant monotherapy with Diphenylhydantoin (DPH) and Carbamazepine (CBZ) the serum activities of gamma-GT, ASAT, ALAT, and AP were examined retrospectively. Elevated serum levels of enzymes were seen predominantly concerning gamma-GT and AP. 91% resp. 39% of patients receiving DPH-therapy showed increased gamma-GT resp. AP-levels compared to 64% and 14% of gamma-GT and AP-elevations by CBZ-treatment. All enzymes evaluated were more often and higher elevated by DPH than CBZ. Frequency and extent of increased activity of gamma-GT were highly related to daily dosage in both preparations. The proportion of pathological enzyme levels was associated with age in DPH and CBZ as well but not found to be significant. Sex differences in the frequency of increased enzyme activities could not be demonstrated. The results are discussed in the context of induction of cytochrome P-450-system.

Adult↗