Increased catalase activity was observed in the liver microsomal fraction of ethanol-treated rats (10% v/v aqueous ethanol solution per os for 5 weeks). In contrast, cytochrome P-450 concentration and specific activity of NADPH-cytochrome c reductase remained at the same level as in the liver of control rate (drinking water). The ratio of microsomal H202-generation to catalase activity was lower In the "ethanol" group than in the control one. This phenomenon seems to be related to the increased contribution of the "peroxidatic" reaction (increased rate of ethanot oxidation). Administration of mesitylene (1,3,5-trimethylbenzene) by gastric tube for 3 days (5 mmoles per kg daily) increased cytochrome P-450 concentration» specific activity of NADPH-cytochrome c reductase and ethanol metabolism.
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