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• W2016997058 abstract "Estrogen receptor-α (ERα) and transforming growth factor-beta (TGF-β) signaling pathways are essential regulators during mammary gland development and tumorigenesis. Ski-related novel gene (SnoN) is an oncoprotein and a negative feedback inhibitor of TGF-β signaling. We have previously reported that low expression of SnoN in ERα positive breast carcinomas is associated with favorable prognosis (Zhang et al. Cancer Res. (2003) 63, 5005-5010). Here we have studied the mechanism of a possible cross-talk between ERα and SnoN. We find that SnoN interacts with the estrogen-activated form of ERα in the nucleus. SnoN contains two highly conserved nuclear receptor binding LxxLL-like motifs and we show that mutations in these motifs reduce the interaction of SnoN with ERα. Over-expression of SnoN enhanced the transcriptional activity of ERα in estrogen response element (ERE)-reporter assays, augmented the expression of several ERα target genes and increased the proliferation of MCF7 breast carcinoma cells in an estrogen-dependent manner. Chromatin immunoprecipitation demonstrated that SnoN interacts with ERα at the TTF1 (pS2) gene promoter. Conversely, silencing of SnoN reduced both ERE-reporter activity and the expression of ERα target genes in MCF7 and T-47D breast cancer cells. Histone deacetylase inhibition increased the level of SnoN and SnoN-dependent enhancement of ERα-dependent transcription and SnoN supported the recruitment of p300 histone acetylase to ERα. This study reveals a novel mechanism that interconnects ERα and TGF-β signaling pathways by SnoN. Accordingly, the results indicate that high SnoN level promotes ERα signaling and possibly breast cancer progression." @default.
• W2016997058 created "2016-06-24" @default.
• W2016997058 creator A5028508240 @default.
• W2016997058 creator A5048906125 @default.
• W2016997058 date "2012-04-01" @default.
• W2016997058 modified "2023-09-24" @default.
• W2016997058 title "SnoN oncoprotein enhances estrogen receptor-α transcriptional activity" @default.
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• W2016997058 doi "https://doi.org/10.1016/j.cellsig.2011.12.015" @default.
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