RNA-binding protein HuR mediates cytoprotection through stimulation of XIAP translation.

RNA-binding protein HuR mediates cytoprotection through stimulation of XIAP translation.
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DOI:
10.1038/onc.2010.527
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发表时间:
2011-03-24
期刊:
影响因子:
8
通讯作者:
Holcik, M.
Holcik, M.
中科院分区:
医学1区
文献类型:
--
作者:
Durie, D.;Lewis, S. M.;Liwak, U.;Kisilewicz, M.;Gorospe, M.;Holcik, M.

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内源性细胞半胱天冬酶抑制剂XIAP的表达主要在蛋白质合成水平上调节。5′端非翻译区含有一个内部核糖体进入位点(IRES)基序,在细胞应激条件下支持XIAP mRNA的帽非依赖性翻译。在这项研究中,我们表明RNA结合蛋白HuR(已知可协调抗凋亡细胞程序)通过XIAP IRES刺激XIAP mRNA的翻译。我们进一步表明,HuR结合XIAP IRES在体外和体内,并刺激招聘的XIAP mRNA到多核糖体。重要的是,保护从凋亡诱导剂依托泊苷的过度表达HuR需要XIAP的存在下,这表明HuR介导的细胞保护部分通过增强XIAP翻译执行。我们的数据表明,XIAP属于HuR调节的抗凋亡基因的RNA操纵子,其沿着Bcl-2、Mcl-1和ProTα,有助于调节细胞存活。
Expression of the intrinsic cellular caspase inhibitor XIAP is regulated primarily at the level of protein synthesis. The 5′ untranslated region harbours an 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 antiapoptotic cellular program, stimulates translation of XIAP mRNA through XIAP IRES. We further show that HuR binds to XIAP IRES in vitro and in vivo, and stimulates recruitment of the XIAP mRNA into polysomes. Importantly, protection from the apoptosis-inducing agent etoposide by overexpression of HuR requires the presence of XIAP, suggesting that HuR-mediated cytoprotection is partially executed through enhanced XIAP translation. Our data suggest that XIAP belongs to the HuR-regulated RNA operon of antiapoptotic genes, which, along with Bcl-2, Mcl-1 and ProTα, contributes to the regulation of cell survival.
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