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Growth Differentiation Factor-9 Inhibits 3'5'-Adenosine Monophosphate-Stimulated Steroidogenesis in Human Granulosa and Theca Cells

Center for Research on Reproduction and Women’s Health (N.Y., L.K.C., J.F.S.), University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104; and Milton S. Hershey Medical Center (J.M.M.), The Pennsylvania State University College of Medicine, Department of Cellular and Molecular Physiology, Hershey, Pennsylvania 17033

Address all correspondence and requests for reprints to: Jerome F. Strauss, III, M.D., Ph.D., Director, Center for Research on Reproduction and Women’s Health, 1354 Biomedical Research Building II/III, 421 Curie Boulevard, Philadelphia, Pennsylvania 19104. E-mail: . jfs3{at}mail.med.upenn.edu

Abstract

Growth differentiation factor-9 (GDF-9), a member of the transforming growth factor superfamily, modulates the development and function of granulosa and theca cells. Targeted deletion of GDF-9 in the mouse revealed that GDF-9 was essential for the establishment of the thecal cell layer during early folliculogenesis. During later stages of follicular development, the roles of GDF-9 are less well understood, but it has been postulated that oocyte-derived GDF-9 may prevent premature luteinization of follicular cells, based on its ability to modulate steroidogenesis by rodent ovarian cells. In the rodent, GDF-9 is expressed solely by the oocyte from the early primary follicular stage through ovulation. Recent studies in the rhesus monkey demonstrated that granulosa cells express GDF-9, suggesting a broader role for this protein in ovarian function in primates. We examined the effect of recombinant GDF-9 on proliferating human granulosa and thecal cell steroidogenesis and the expression of steroidogenic acute regulatory protein (StAR), P450 side-chain cleavage, and P450 aromatase. We also examined granulosa cell GDF-9 expression by quantitative RT-PCR and by Western analysis. GDF-9 inhibited 8-Br-cAMP-stimulated granulosa progesterone synthesis by approximately 40%, but did not affect basal progesterone production. Concordant with reduced steroid production, 8-Br-cAMP-stimulated StAR protein expression was reduced approximately 40% in granulosa cells, as were expression of StAR mRNA and StAR promoter activity. Additionally, GDF-9 inhibited 8-Br-cAMP-stimulated expression of P450 side-chain cleavage and P450 aromatase. Human granulosa cells expressed GDF-9, as determined by RT-PCR and Western analysis. Treatment of human thecal cells with GDF-9 blocked forskolin-stimulated progesterone, 17-hydroxyprogesterone, and dehydroepiandrosterone synthesis. Thecal cells exhibited greater sensitivity to GDF-9, suggesting that this cell may be a primary target of GDF-9. Moreover, GDF-9 increased thecal cell numbers during culture, but had no effect on granulosa cell growth. Our findings implicate GDF-9 in the modulation of follicular steroidogenesis, especially theca cell function. Because GDF-9 mRNA and protein are detectable in granulosa-lutein cells after the LH surge, the concept of GDF-9 as a solely oocyte-derived luteinization inhibitor needs to be reevaluated.

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