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Endocrinology, Vol 125, 2790-2792, Copyright © 1989 by Endocrine Society
ARTICLES |
IM Turner, PT Saunders, S Shimasaki and SG Hillier
Department of Obstetrics and Gynaecology, University of Edinburgh, UK.
Roles of follicle-stimulating hormone (FSH) and sex steroids in regulating the expression of mRNA species encoding the alpha-, beta A- and beta B-subunits 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 5 alpha-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-, beta A- and beta B-subunit mRNA were approximately 60-fold, 70-fold and 66-fold greater than control, respectively. In cultures treated with E alone, levels of inhibin alpha- and beta B-subunit mRNA were elevated approximately 4-fold and 2-fold, respectively, but the level of inhibin beta A-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 alpha-subunit gene expression and provide direct evidence that both inhibin beta-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.
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