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Relationships among progesterone, androgen, and estradiol in corpora lutea and nonluteal ovarian compartments of pseudopregnant rats: effects of decidual tissue.

Rats (200–275 g) were rendered pseudopregnant on the morning of estrus (day 1) by cervical stimulation. On day 5 of pseudopregnancy (PS), the rats (8–12/group) were subjected to either hysterectomy (HX) or unilateral or bilateral decidual cell reactions (uni- or bi-DCR). Control pseudopregnant (C-PS) rats were sham operated on day 5. On days 8 and 12, the rats were killed by decapitation. Blood was collected, and serum was saved for RIA of estradiol (E2), progesterone (P), androgen (A), and gonadotropins. Corpora lutea (CL) and the nonluteal ovarian compartment (NLO) were incubated separately in vitro for 2 h in Krebs-Ringer bicarbonate buffer, and steroid concentrations were determined in CL and NLO (before and after incubation) and in incubation media. On day 8 of PS, P and A levels in the serum in bi-DCR rats were higher than those in C-PS but not in uni-DCR and HX-PSP rats; however, on day 12, serum P and A levels in bi-DCR rats were higher than the levels of other PS groups, with the exception of C-P...