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YB1/p32, a nuclear Y-box binding protein 1, is a novel regulator of myoblast differentiation that interacts with Msx1 homeoprotein.

Exp. Cell Res.2010 Feb 15;316(4):517-29. Epub 2009 Dec 11
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摘要


Precisely controlled cellular differentiation is essential for the proper development of vertebrate embryo and deregulated differentiation is a major cause of many human congenital diseases as well as cancer. Msx1 is a member of the homeoprotein family implicated in these processes, which inhibits the differentiation of skeletal muscle and other cell types, presumably by regulating transcription of target genes through interaction with other cellular factors. We presently show that YB1/p32, a nuclear Y-box binding protein 1, interacts with Msx1 homeoprotein and functions as a regulator of C2C12 myoblast differentiation. We demonstrate that YB1/p32 functionally interacts with Msx1 through its N-terminal region and colocalizes with Msx1 at the nuclear periphery. Moreover, we find that YB1/p32 is competent for inhibition of C2C12 myoblast differentiation, which is correlated with its activity as a negative regulator of MyoD gene expression and binding to the MyoD core enhancer region (CER). Furthermore, YB1/p32 cooperates with Msx1 in transcriptional repression and knocking down the expression of endogenous YB1 attenuates the effects of Msx1. Taken together, our study has uncovered a new function of YB1/p32, a regulator of skeletal muscle differentiation.

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