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[The enzymes of the metabolism of exogenous compounds in the comparative assessment of the toxicity of trichothecene mycotoxins].

Moderate clinical, biochemical and hematologic signs of intoxication were observed in mice after single administration of HT-2 toxin (deacetylated derivative of T-2 toxin) in LD50 of 12.75 mg/kg or in 1/5 of LD50 for 7 days. The toxin produced no toxic effect when 1/10 and 1/50 of LD50 were administered for 14 days. With the dose exceeding 1/50 of LD50 a reduction in cytochrome P-450 content, carboxylesterase activity and increased activity of UDP-glucuronosyltransferase and glutathione transferase were recorded. T-2 toxin produced a more pronounced toxic effect, inhibited UDP-glucuronosyltransferase and insignificantly stimulated glutathione transferase activity. Lower HT-2 toxin toxicity is believed to depend on its ability to activate conjugation reactions to a greater extent than T-2 toxin.