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Endocrinology, doi:10.1210/endo-125-5-2790
Endocrinology Vol. 125, No. 5 2790-2792
Copyright © 1989 by the Endocrine Society.
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Regulation of Inhibin Subunit Gene Expression by FSH and Estradiol in Cultured Rat Granulosa Cells

IM Turner, PTK Saunders*, S Shimasaki{dagger} and SG Hillier

Reproductive Endocrinology Laboratories, University of Edinburgh Department of Obstetrics and Gynaecology 37 Chalmers Street, Edinburgh EH3 9EW, UK
* MRC Reproductive Biology Unit, Centre for Reproductive Biology 37 Chalmers Street, Edinburgh EH3 9EW, UK
{dagger} Laboratories for Neuroendocrinology, The Salk Institute La Jolla, California 92037, USA

Abstract

Roles of follicle-stimulating hormone (FSH) and sex steroids in regulating the expression of mRNA species encoding the {alpha}-, βA- and βBsubunits of inhibin were studied in cultured granulosa cells from immature rat ovaries. Inhibin subunit mRNAs were detected by Northern blot analysis of total RNA extracted from granulosa cell monolayers which had been incubated for 48 h in serum-free medium containing FSH (100 ng/ml) and/or a steroid (10–6 M): estradiol (E), testosterone (T) or 5ct-dihydrotestosterone (DHT). Levels of mRNA encoding each inhibin subunit in untreated (control) cultures were low. In cultures treated with FSH alone, levels of inhibin {alpha}-, βA- and ββ-subunit mRNA were approximately 60-fold, 70-fold and 66-fold greater than control, respectively. In cultures treated with E alone, levels of inhibin a- and βB-subunit mRNA were elevated approximately 4-fold and 2-fold, respectively, but the level of inhibin βA-subunit mRNA was not measurably affected. Treatment with T or DHT alone had no consistent effect on the levels of any inhibin subunit mRNA. The stimulatory effects of FSH were not consistently altered by the presence of either androgen or estrogen. These results confirm the role of FSH in regulating inhibin a-subunit gene expression and provide direct evidence that both inhibin p-subunit genes are inducible by FSH in granulosa cells. All three inhibin subunit mRNAs followed the same pattern, suggesting that their expression is coordinately regulated by FSH during granulosa cell differentiation.

Received September 11, 1989.




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