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Effects of Fungicides on Rat's Neurosteroid Synthetic Enzymes.
Exposure to environmental endocrine disruptors may interfere with nervous system's activity. Fungicides such as tebuconazole, triadimefon, and vinclozolin have antifungal activities and are used to prevent fungal infections in agricultural plants. In the present study, we studied effects of tebuconazole, triadimefon, and vinclozolin on rat's neurosteroidogenic 5 α -reductase 1 (5 α -Red1), 3 α -hydroxysteroid dehydrogenase (3 α -HSD), and retinol dehydrogenase 2 (RDH2). Rat's 5 α -Red1, 3 α -HSD, and RDH2 were cloned and expressed in COS-1 cells, and effects of these fungicides on them were measured. Tebuconazole and triadimefon competitively inhibited 5 α -Red1, with IC50 values of 8.670 ± 0.771 × 10-6 M and 17.390 ± 0.079 × 10-6 M, respectively, while vinclozolin did not inhibit the enzyme at 100 × 10-6 M. Triadimefon competitively inhibited 3 α -HSD, with IC50 value of 26.493 ± 0.076 × 10-6 M. Tebuconazole and vinclozolin weakly inhibited 3 α -HSD, with IC50 values about 100 × 10-6 M, while vinclozolin did not inhibit the enzyme even at 100 × 10-6 M. Tebuconazole and triadimefon weakly inhibited RDH2 with IC50 values over 100 × 10-6 M and vinclozolin did not inhibit this enzyme at 100 × 10-6 M. Docking study showed that tebuconazole, triadimefon, and vinclozolin bound to the steroid-binding pocket of 3 α -HSD. In conclusion, triadimefon potently inhibited rat's neurosteroidogenic enzymes, 5 α -Red1 and 3 α -HSD.
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