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biomill8358無蟲 (小有名氣)
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【分享】RNA 結(jié)合蛋白HuR通過刺激XIAP的翻譯而介導(dǎo)的細(xì)胞保護(hù) 已有1人參與
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RNA-binding protein HuRmediates cytoprotectionthrough stimulation of XIAP translation RNA 結(jié)合蛋白HuR通過刺激XIAP的翻譯而介導(dǎo)的細(xì)胞保護(hù) DDurie1,2, S MLewis1,5, ULiwak1,2, MKisilewicz1,2, MGorospe4 and MHolcik Oncogene(2011) 30, 1460–1469; doi:10.1038/onc.2010.527; published online 22 November 2010 摘要:Expression of the intrinsic cellular caspaseinhibitor XIAP is regulated primarily at the level of protein synthesis. The 5′untranslatedregion 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 ProTα, contributes to the regulation of cell survival. 1.細(xì)胞固有的caspase抑制物XIAP的表達(dá)主要在蛋白合成的水平上受到調(diào)控。5′UTR區(qū)有一個(gè)內(nèi)部核糖體進(jìn)入位點(diǎn)(IRES)結(jié)構(gòu)域,它為在細(xì)胞壓力條件下,XIAP mRNA帽子依賴的翻譯提供了支持。 2.本研究中,我們展示了RNA結(jié)合蛋白HuR,一種協(xié)調(diào)細(xì)胞抗凋亡程序的蛋白,通過XIAP的IRES刺激XIAP mRNA的翻譯。進(jìn)一步展示了HuR在體內(nèi)外與XIAP IRES的結(jié)合并刺激招募XIAP mRNA形成多聚體。 3.重要的是,過表達(dá)HuR抵抗引發(fā)凋亡的試劑依托泊甙需要XIAP的存在,暗示HuR介導(dǎo)的細(xì)胞保護(hù)作用部分的通過加強(qiáng)XIAP的翻譯來執(zhí)行。 4.我們的數(shù)據(jù)暗示XIAP屬于HuR調(diào)節(jié)的抗凋亡基因的RNA操縱子,它與Bcl-2, Mcl-1 和ProTα一起有助于細(xì)胞生存的調(diào)控。 更多資料請(qǐng)登錄www.bioknow.cn |
鐵桿木蟲 (著名寫手)
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