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Endocrinology, Vol 130, 1296-1302, Copyright © 1992 by Endocrine Society

ARTICLES

Hormonal regulation of follicle-stimulating hormone receptor messenger ribonucleic acid levels in cultured rat granulosa cells

JL Tilly, PS LaPolt and AJ Hsueh
Department of Gynecology and Obstetrics, Stanford University School of Medicine, California 94305-5317.

The maturation of ovarian granulosa cells is dependent upon the pituitary gonadotropin FSH, the actions of which are mediated via specific plasma membrane receptors. To study the regulation of ovarian FSH receptor expression at the mRNA level, we used a specific cRNA probe to evaluate changes in FSH receptor transcripts in cultured granulosa cells. Granulosa cells obtained from immature estrogen- treated rats contained two predominant FSH receptor mRNA transcripts (7.0 and 2.5 kilobases), the levels of which declined in a time-related manner during a 2-day culture period. However, inclusion of FSH (30 ng/ml) in the culture medium prevented the decline in FSH receptor mRNA levels. Compared to controls, treatment of granulosa cells for 48 h with FSH (1-100 ng/ml) increased FSH receptor mRNA levels in a dose- dependent manner (ED50, 4.5 ng/ml), with a maximal 5.9 +/- 0.7-fold increase observed in response to 30 ng/ml FSH. The stimulatory actions of FSH were mimicked by the adenyl cyclase activator forskolin (0.1-30 microM), suggesting the involvement of cAMP in FSH receptor gene transcription and/or mRNA stability. Incubation of granulosa cells for 48 h with epidermal growth factor (EGF; 0.3-10 ng/ml), basic fibroblast growth factor (bFGF; 1-30 ng/ml), or insulin-like growth factor-I (IGF- I; 1-30 ng/ml) did not affect basal FSH receptor mRNA levels, whereas the highest doses of EGF and bFGF, but not IGF-I, completely suppressed the stimulatory effects of FSH (30 ng/ml) on its own receptor mRNA levels. Similarly, GnRH (10-1000 nM) attenuated the actions of FSH on its receptor mRNA levels in a dose-dependent manner (ID50, 8 nM). The inhibitory effects of GnRH (100 nM) were reversed by cotreatment with a GnRH antagonist ([Ac-D-Phe1,D-pCl-Phe2,D-Trp3,6]GnRH; 100 nM), indicating that the actions of GnRH are mediated via specific GnRH receptors. These data indicate that treatment of granulosa cells with FSH increases the levels of two FSH receptor mRNA transcripts. However, this positive feedback system, which may lead to an amplification of FSH action, is tightly regulated by the inhibitory actions of EGF, bFGF, and GnRH. Thus, the use of cultured rat granulosa cells provides a model system to analyze the hormonal regulation of FSH receptor gene expression in the ovary.


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