Effects of steroids on progesterone output by explants of human chorion

Gynecologic and Obstetric Investigation
W A PowellJ R Challis

Abstract

Human chorion can synthesize and metabolize progesterone, and changes in progesterone synthesis by chorion at term might be important in the processes leading to parturition. We examined whether other steroids present within the maternal compartment and amniotic fluid during late pregnancy influence progesterone output by explants of chorion. We also sought differences in steroid effects on progesterone output in association with labor. Explants were prepared from chorion collected after the spontaneous onset of labor and vaginal delivery and chorion collected after cesarean section without active labor. To study the short-term effects of steroids on progesterone output by chorion, explants were incubated for 4 h with 3 microM pregnenolone and 3 microM of a potential interacting steroid. Other explants were preincubated for 24 h with steroid, then rinsed and incubated for 4 h with 3 microM pregnenolone and 3 microM of the same steroid as during preincubation. Under these conditions, dehydroepiandrosterone and androstenedione inhibited progesterone output by explants of chorion obtained at spontaneous labor and at cesarean section. Testosterone also inhibited progesterone output, but only in cesarean section chorion. If explants...Continue Reading

Citations

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