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Xenobiotica
the fate of foreign compounds in biological systems
Volume 21, 1991 - Issue 7
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Original Article

Effects of simvastatin, a lipoprotein-lowering drug, on the hepatic enzymes involved in drug metabolism in the Wistar rat

, , , &
Pages 859-864 | Received 02 Aug 1990, Accepted 01 Jan 1990, Published online: 27 Aug 2009
 

Abstract

1 Simvastatin, a competitive inhibitor of 3-hydroxy-3-methyl glutaryl CoA reductase, lowers the plasma cholesterol level and has been approved for treatment of hyperlipoproteinaemia.

2. Simvastatin has been studied for its effects on hepatic microsomal drug metabolism in rat. No induction of 7-ethoxyresorufin-O-deethylase (EROD), ethoxycoumarin-O-deethylase (ECOD) and of UDP-glucuronosyltransferases were found, in vitro, after administration of 0.5, 1.5 and 10mg/kg per day for 22 days.

3. Epoxide hydrolases (microsomal and cytosolic) were also unchanged after treatment with simvastatin.

4. No increase of the palmitoyl CoA oxidase activity or of mitochondrial glycerol phosphate dehydrogenase activity occurred.

5. Fatty acid distribution in rat liver microsomal phosphatidylcholines showed a significant decrease of C16:1 and a significant increase of C20:4 acids.

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