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• W2021040924 abstract "Cultured rat granulosa cells have provided a useful model to examine the hormonal regulation of inhibin secretion. In the present study we have used the cloned rat inhibin alpha- and beta A-subunit cDNAs to characterize the influences of gonadotropins, growth factors, and GnRH on inhibin subunit mRNA levels in granulosa cells obtained from immature estrogen-treated rats. Cells were cultured in medium with or without added hormones. Total RNA from cultured cells was extracted and hybridized with 32P-labeled inhibin alpha- and beta A-subunit cRNA or beta-actin cDNA probes, and inhibin subunit mRNA levels were normalized with beta-actin mRNA levels. Treatment of granulosa cells with FSH increased inhibin alpha- and beta A-subunit mRNA levels in a dose-dependent manner. Similarly, LH, but not PRL, increased alpha- and beta A-subunit mRNA levels in granulosa cells pretreated with FSH to induce functional LH and PRL receptors. The effects of FSH and LH on inhibin subunit mRNA levels were mimicked by forskolin, which increased alpha- and beta A-subunit transcripts in a dose- and time-dependent manner, suggesting involvement of the cAMP-dependent protein kinase-A pathway. Since several growth factors have been shown to influence inhibin secretion, their effects on inhibin subunit mRNA levels were also studied. Treatment of cells with transforming growth factor-beta 1 increased both basal and FSH-stimulated inhibin alpha- and beta A-subunit mRNA content, whereas insulin-like growth factor-I had no significant effect. In contrast, both epidermal growth factor (EGF) and basic fibroblast growth factor (FGF) markedly suppressed both basal and FSH-stimulated inhibin subunit transcript levels. The inhibitory effects of EGF and basic FGF were dose dependent and persisted from 12-72 h of incubation. The regulatory peptide GnRH, which decreases inhibin secretion, was also found to suppress FSH-stimulated inhibin alpha- and beta A-subunit mRNA levels in a dose-dependent manner. Furthermore, the effects of GnRH could be counteracted by coincubation with a GnRH antagonist, suggesting the involvement of specific GnRH-binding sites in GnRH action. These studies indicate that, except for insulin-like growth factor-I, the effects of gonadotropins, growth factors (EGF, basic FGF, and transforming growth factor-beta 1), and GnRH on inhibin secretion are related to their regulation of inhibin alpha- and beta A-subunit mRNA levels." @default.
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• W2021040924 date "1990-08-01" @default.
• W2021040924 modified "2023-10-18" @default.
• W2021040924 title "Regulation of Inhibin Subunit Messenger Ribonucleic Acid Levels by Gonadotropins, Growth Factors, and Gonadotropin-Releasing Hormone in Cultured Rat Granulosa Cells*" @default.
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• W2021040924 doi "https://doi.org/10.1210/endo-127-2-823" @default.
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