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- W2032819504 abstract "We have previously reported in C2C12 murine skeletal muscle cells that 10−8 M 17β-estradiol promotes MAPKs stimulation which in turn mediates the activation of CREB and Elk-1 transcription factors. In this work, we demonstrated that the hormone induces ERK2 phosphorylation (without affecting ERK1 activation) and also stimulates p38 MAPK, both in a dose-dependent manner. Moreover, estrogen receptors involvement in MAPKs activation by the estrogen was studied. The use of ICI182780 (1 μM), an antagonist of ERs, and specific siRNAs to block ERα and ERβ expression, demonstrated that ERα mediates ERK2 activation but not p38 MAPK phosphorylation by 17β-estradiol, and that ERβ isoform is not implicated in MAPKs activation by the hormone. Furthermore, Src and PKC contribution in estrogen stimulation of the MAPKs was investigated. Compounds PP2 and Ro318220, Src and PKC family inhibitors, respectively abrogated ERK2 and p38 MAPK phosphorylation by 17β-estradiol. Of interest, the hormone was able to induce Src and PKCδ activation. In addition, Ro318220 decreased estrogen-dependent Src modulation implicating PKC in hormone upregulation of Src. Accordingly, PP2 and Ro318220 suppressed CREB and Elk-1 phosphorylation as well as c-Fos and c-Jun oncoprotein levels induced by 17β-estradiol. Altogether, these data indicate that 17β-estradiol activates ERK2 through ERα and p38 MAPK in an ERα/β-independent manner and that PKC and Src proteins are key upstream components on MAPKs activation in C2C12 skeletal muscle cells." @default.
- W2032819504 created "2016-06-24" @default.
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- W2032819504 date "2010-10-01" @default.
- W2032819504 modified "2023-09-26" @default.
- W2032819504 title "Role of estrogen receptors, PKC and Src in ERK2 and p38 MAPK signaling triggered by 17β-estradiol in skeletal muscle cells" @default.
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- W2032819504 doi "https://doi.org/10.1016/j.jsbmb.2010.05.002" @default.
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