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The Groucho protein Grg4 suppresses Smad7 to activate BMP signaling.

Biochem. Biophys. Res. Commun.2013 Oct 25;440(3):454-9. Epub 2013 Oct 05
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摘要


Groucho related genes encode transcriptional repressor proteins critical for normal developmental processes. The bone morphogenetic proteins belong to the transforming growth factor-β (TGF-β) superfamily and play important signaling roles in development and disease. However, the regulation of BMP signaling, especially within cells, is largely unknown. In this report, we show that expression of the Groucho related gene Grg4 robustly activates the expression of a BMP reporter gene, as well as enhancing and sustaining the upregulation of the endogenous Id1 gene induced by BMP7. BMP7 administration did not affect the endogenous level of Grg4 nor did it enhance the phosphorylation of receptor activated Smad proteins. Rather, Grg4 expression reduced the levels of the endogenous inhibitory Smad7, thus increasing the transcriptional responses mediated by BMP responsive sequences. The data point to a novel mechanisms for attenuating BMP signaling through altering the ratio of activating versus inhibitory Smad proteins.

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