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• W2010523235 abstract "Abstract The coordinated function of the different compartments of the follicle, the oocyte and the somatic cumulus/granulosa cells, is enabled by the presence of a network of cell-to-cell communication generated by gap junctions. Connexin 43 (Cx43) is the most abundant gap junction protein expressed by the ovarian follicle. The expression of Cx43 is subjected to the control of gonadotropins as follows: FSH up-regulates, whereas LH down-regulates its levels. The aim of this study was to explore the mechanism by which LH reduces the levels of Cx43 and to identify the signal transduction pathway involved in this process. The effect of LH was studied in vitro using isolated intact ovarian follicles. The possible mediators of LH-induced Cx43 down-regulation were examined by incubating the follicles with LH in the presence or absence of inhibitors of protein kinase A (PKA) and of MAPK signaling pathways. Our experiments revealed a 3-h half-life of Cx43 in both control and LH-treated follicles, suggesting that LH did not affect the rate of Cx43 degradation. We further demonstrated that the level of Cx43 mRNA was not significantly influenced by this gonadotropin. However, upon LH administration, [35S]methionine incorporation into Cx43 protein was remarkably reduced. The LH-induced arrest of Cx43 synthesis was counteracted by inhibitors of both the PKA and the MAPK cascades. We show herein that LH inhibits Cx43 expression by reducing its rate of translation and that this effect is mediated by both PKA and MAPK." @default.
• W2010523235 created "2016-06-24" @default.
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• W2010523235 date "2004-04-01" @default.
• W2010523235 modified "2023-10-02" @default.
• W2010523235 title "Luteinizing Hormone-Induced Connexin 43 Down-Regulation: Inhibition of Translation" @default.
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• W2010523235 doi "https://doi.org/10.1210/en.2003-1051" @default.
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