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• W2021968082 abstract "In primary cultures of rat pituitary cells, inhibin and follistatin reduce steady state levels of FSH beta mRNA to less than 10% of control within 4-6 h, while activin increases this mRNA 2- to 3-fold after 2-4 h of treatment. The effects of these three gonadal polypeptide hormones on the LH beta and common alpha-subunit mRNAs are more gradual and of lesser magnitude. The present study was designed to determine whether inhibin, activin, and/or follistatin act at the posttranscriptional level by altering the stability of the gonadotropin subunit mRNAs. To determine the decay rates of FSH beta, LH beta, and alpha-subunit mRNAs, primary pituitary cell cultures were treated for 1-24 h with either of two transcriptional inhibitors, actinomycin-D or 5,6-dichloro-1-beta-ribofuranosyl benzimidazole (DRB), in the presence or absence of recombinant human inhibin-A, recombinant human activin-A, or purified bovine follistatin. The decay of preexisting gonadotropin subunit mRNAs was followed by Northern blot analysis. Levels of LH beta and alpha-subunit mRNAs remained constant or increased during the 24-h exposure to transcriptional inhibitors; therefore, it was not possible to calculate their half-lives. The stability of these mRNAs was not altered by inhibin, activin, or follistatin. In contrast, FSH beta mRNA turned over rapidly: the estimated half-life was 2.6 +/- 0.19 h (mean +/- SEM of eight determinations) after actinomycin-D treatment and 1.9 +/- 0.14 h (mean +/- SEM of 12 determinations) after DRB treatment. When new RNA synthesis was blocked by either actinomycin-D or DRB, there were no significant effects of inhibin, activin, or follistatin on the stability of FSH beta mRNA (n = 2-4 for each hormone). The decay of FSH beta mRNA in the presence of inhibin or follistatin alone, however, was even more rapid than that determined after the administration of transcriptional inhibitors (P < 0.005). After an initial lag of 1-2 h, the half-life of FSH beta mRNA was 0.88 +/- 0.15 h (n = 4) or 0.62 +/- 0.11 h (n = 3), in the presence of inhibin or follistatin, respectively. The most likely interpretation of these results is that inhibin/follistatin reduces steady state levels of FSH beta mRNA by inducing a labile protein that accelerates the degradation of this mRNA species, and the synthesis of this protein is blocked by actinomycin-D or DRB treatment. It is not clear at present whether inhibin, follistatin, and activin have additional effects on transcription of the gonadotropin subunit genes." @default.
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• W2021968082 date "1993-05-01" @default.
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• W2021968082 title "Decay of follicle-stimulating hormone-beta messenger RNA in the presence of transcriptional inhibitors and/or inhibin, activin, or follistatin." @default.
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• W2021968082 doi "https://doi.org/10.1210/mend.7.5.7686252" @default.
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