Background:The fate of dihydrotestosterone has been characterized only in terms of reduction of the 3-ketone. Results: Human P450s 19A1 and 3A4 oxidized dihydrotestosterone to several new products, detected in vivo.
Conclusion:The new P450 19A1 and 3A4 pathways introduce an oxidative dimension to the metabolism of dihydrotestosterone. Significance: Small changes in the steroid A ring can produce major changes in P450 3A4 catalytic selectivity.