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• W2073313862 endingPage "265" @default.
• W2073313862 startingPage "253" @default.
• W2073313862 abstract "GnRH is a potent hypothalamic regulator of gonadotropin hormones, LH and FSH, which are both expressed within the pituitary gonadotrope and are necessary for the stimulation of gametogenesis and steroidogenesis in the gonads. Differential regulation of LH and FSH, which is essential for reproductive fitness, is achieved, in part, through the varying of GnRH pulse frequency. However, the mechanism controlling the increase in FSH during the periods of low GnRH has not been elucidated. Here, we uncover another level of regulation by GnRH that contributes to differential expression of the gonadotropins and may play an important role for the generation of the secondary rise of FSH that stimulates folliculogenesis. GnRH stimulates LHβ and FSHβ subunit transcription via induction of the immediate early genes, Egr1 and c-Fos, respectively. Here, we determined that GnRH induces rapidly both Egr1 and c-Fos, but specifically decreases the rate of c-Fos degradation. In particular, GnRH modulates the rate of c-Fos protein turnover by inducing c-Fos phosphorylation through the ERK1/2 pathway. This extends the half-life of c-Fos, which is normally rapidly degraded. Confirming the role of phosphorylation in promoting increased protein activity, we show that a c-Fos mutant that cannot be phosphorylated by GnRH induces lower expression of the FHSβ promoter than wild-type c-Fos. Our studies expand upon the role of GnRH in the regulation of gonadotropin gene expression by highlighting the role of c-Fos posttranslational modification that may cause higher levels of FSH during the time of low GnRH pulse frequency to stimulate follicular growth." @default.
• W2073313862 created "2016-06-24" @default.
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• W2073313862 date "2013-02-01" @default.
• W2073313862 modified "2023-09-24" @default.
• W2073313862 title "GnRH Increases c-Fos Half-Life Contributing to Higher FSHβ Induction" @default.
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• W2073313862 doi "https://doi.org/10.1210/me.2012-1168" @default.
• W2073313862 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3683808" @default.
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• W2073313862 hasPublicationYear "2013" @default.
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