title: Stimulation of estradiol production from estrone-3-sulfate by 5 alpha-dihydrotestosterone in cultured human placental explants.
abstract: The effect of androgens on the conversion of estradiol (E2) and estrone (E1) from estrone-3-sulfate (E1-S) was studied in explants of normal human term placentas. Explants incubated in medium supplemented with 2.0 microM E1-S showed that 50 microM dihydrotestosterone (DHT) stimulated E2 production 15-fold above control values after 0.5h, but neither 50 microM methyltestosterone (MT) nor 50 microM diethylstilbestrol (DES) had any effect. HCG (5.0 i.u./ml), alone or in combination with one of the androgens, did not influence the E2 production. When the explants were incubated in medium with 0.25 microM E1-S (the average concentration reported for late pregnancy plasma), DHT (0.5-50 microM) caused a dose- and time-dependent increase in E2 production, while E1 production and the combined accumulation of E2 and E1 were slightly inhibited by all doses of DHT during the 0.5-4h incubation. When E1 (0.1 microM) was used as substrate, DHT caused a dramatic dose- and time-dependent shift in the E1-E2 equilibrium towards E2. The results indicate that during late pregnancy, a particular class of androgens may increase the production of the more bioactive E2 from the circulating E1-S; the mode of action may be an enhanced conversion of E1 to E2.
mesh_terms: D000728:Androgens / Q000494:pharmacology; D046508:Culture Techniques; D013196:Dihydrotestosterone / Q000494:pharmacology*; D004958:Estradiol / Q000096:biosynthesis*; D004970:Estrone / Q000031:analogs & derivatives* / Q000096:biosynthesis / Q000378:metabolism; D005260:Female; D006801:Humans; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy
chemical_list: D000728:Androgens; D013196:Dihydrotestosterone; D004970:Estrone; D004958:Estradiol; C017296:estrone sulfate