[Effect of dietary selenium on the activity of UDP-glucuronosyltransferases and metabolism of mycotoxin deoxynivalenol in rats].

The influence of selenium excess and deficiency on the activity of xenobiotic metabolizing enzymes and the metabolism of mycotoxin deoxynivalenol (DON) in rats was studied. Wistar male rats were fed for 6 weeks semi-synthetic diets containing 0.2, 1.0 or 5.0 ppm selenium. For induction of selenium deficiency the weanling rats were fed for 6 weeks diet containing < or = 0.02 ppm selenium. The activity of selenium-dependent glutathione peroxidase was reduced in the liver of selenium-deficient rats by 93% at 42 days. DON, its de-epoxy metabolite DOM-1, DON and DOM-1 glucuronides were analyzed by reverse-phase HPLC in urine and feces after the single oral dose of DON (8 mg/kg). Selenium-supplemented (5 ppm) diet increased by 2-3 times formation and elimination of DON and DOM-1 glucuronides in urine. Selenium-deficient diet decreased formation of DOM-1, but increased significantly total excretion of DON and DON glucuronides. The activity of GT1 and GT2 forms of UDP-glucuronosyltransferase, an enzyme principally responsible for glucuronidation, was two times higher in the liver of rats fed both selenium-supplemented and selenium-deficient diets.