[Activity of enzymes of xenobiotic metabolism in the liver of rats with vitamin A deficiency and mycotoxicosis T-2].

Keeping male rats within a month on a ration deficient in vitamin A led to a distinct decrease in content of cytochrome P-450, in activities of carboxylase, epoxide hydrolase, aniline hydrolase and to a slight inhibition of UDP-glucuronosyl transferase in live tissue. At the same time, activity of glutathione transferase and content of reduced glutathione in liver tissue were increased. After administration of the epoxide-containing T-2 mycotoxin into rats within 10 days at a dose of 0.54 mg/kg activity of the enzymes catalyzing metabolism of xenobiotics was inhibited in the animals maintained on the complete half-synthetic ration, except of epoxide hydrolase and glutathione transferase, activity of which was elevated. The administration of T-2 toxin under conditions of deficiency in vitamin A caused especially distinct inhibition of the enzymes involved in the 1 phase of xenobiotic metabolism but it was accompanied by only slight increase in T-2 toxicosis. The enzymes participating in conjugation of xenobiotics as well as epoxide hydrolase appear to play major roles in detoxication of T-2 mycotoxin.