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RNA-binding protein HuRmediates cytoprotectionthrough stimulation of XIAP translation
RNA ½áºÏµ°°×HuRͨ¹ý´Ì¼¤XIAPµÄ·­Òë¶ø½éµ¼µÄϸ°û±£»¤
DDurie1,2, S MLewis1,5, ULiwak1,2, MKisilewicz1,2, MGorospe4 and MHolcik
Oncogene(2011) 30, 1460¨C1469; doi:10.1038/onc.2010.527; published online 22 November 2010
ÕªÒª£ºExpression of the intrinsic cellular caspaseinhibitor XIAP is regulated primarily at the level of protein synthesis. The 5¡äuntranslatedregion harboursan Internal Ribosome Entry Site (IRES) motif that supports cap-independent translation of XIAP mRNA during conditions of cellular stress. In this study, we show that the RNA-binding protein HuR, which is known to orchestrate an antiapoptoticcellular program, stimulates translation of XIAP mRNA through XIAP IRES. We further show that HuRbinds to XIAP IRES in vitroand in vivo, and stimulates recruitment of the XIAP mRNA into polysomes. Importantly, protection from the apoptosis-inducing agent etoposideby overexpressionof HuRrequires the presence of XIAP, suggesting that HuR-mediated cytoprotectionis partially executed through enhanced XIAP translation. Our data suggest that XIAP belongs to the HuR-regulated RNA operonof antiapoptoticgenes, which, along with Bcl-2, Mcl-1 and ProT¦Á, contributes to the regulation of cell survival.
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