The effect of leuprolide acetate on steroidogenesis by granulosa and theca cells in vitro.

Enhancement of follicular response to controlled ovarian hyperstimulation for human in vitro fertilization (IVF) has been suggested following pretreatment with leuprolide acetate (LA). However, additional human menopausal gonadotropin (hMG) is required to achieve follicle maturity in the presence of LA. We studied the effect of LA on steroidogenesis of granulosa and theca cells in vitro. Human granulosa cells obtained from IVF follicular fluid aspirations were cultured for 14 days in the presence and absence of human chorionic gonadotropin (hCG). hCG significantly enhanced progesterone (P) and estradiol (E2) production by the cells, however, the addition of LA in concentrations of 10, 100, and 1000 ng/ml had no effect. Porcine granulosa cells were cultured for 48 hr in the presence and absence of follicle stimulating hormone (FSH) with the addition of LA at the same doses. LA did not affect the FSH-induced increase in P production. Porcine theca cells were cultured for 48 hr in the presence and absence of hCG. The addition of LA did not affect androstenedione (A) production by these cells. We conclude that in this dynamic model in vitro, LA does not inhibit or stimulate P or E2 production by granulosa or A production by theca cells.