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Effects of ammonium metavanadate on rat liver enzymes
Toxicology Letters
|October 1, 1983
Abstract:
Five min after administration of a single, i.p. dose of ammonium metavanadate (5 mg/kg), in rats, liver enzyme activities were measured. Microsomal mixed-function oxidases (except for aminopyrine N-demethylase), glucose-6-phosphatase and alkaline phosphatase were inhibited but lactate, malate, and glycerophosphate dehydrogenases as well as microsomal NADPH2-dependent cytochrome c reductase were unchanged.
Insights
Ammonium metavanadate exposure in rats inhibited key liver enzymes involved in metabolism and detoxification. However, certain dehydrogenases and reductase enzymes remained unaffected, indicating a selective toxicological impact.
Area of Science:
- Biochemistry
- Toxicology
- Enzymology
Background:
- Ammonium metavanadate is a chemical compound with known toxicological properties.
- Liver enzymes play crucial roles in metabolic processes and detoxification pathways.
- Understanding the specific effects of vanadate compounds on liver function is important for assessing health risks.
Purpose of the Study:
- To investigate the acute effects of ammonium metavanadate on specific liver enzyme activities in rats.
- To determine which liver enzymes are sensitive to vanadate exposure.
Main Methods:
- Rats were administered a single intraperitoneal dose of ammonium metavanadate (5 mg/kg).
- Liver enzyme activities were measured five minutes post-administration.
- Assayed enzymes included microsomal mixed-function oxidases, glucose-6-phosphatase, alkaline phosphatase, lactate dehydrogenase, malate dehydrogenase, glycerophosphate dehydrogenase, and NADPH2-dependent cytochrome c reductase.
Main Results:
- Ammonium metavanadate significantly inhibited microsomal mixed-function oxidases (excluding aminopyrine N-demethylase), glucose-6-phosphatase, and alkaline phosphatase.
- Lactate dehydrogenase, malate dehydrogenase, glycerophosphate dehydrogenase, and microsomal NADPH2-dependent cytochrome c reductase activities were not significantly altered.
Conclusions:
- Acute exposure to ammonium metavanadate selectively impacts certain liver enzymes involved in metabolic and detoxification pathways.
- The findings highlight the differential sensitivity of hepatic enzymes to vanadate toxicity.