近日,紐約大學(xué)醫(yī)學(xué)院的研究人員首次確定了一個(gè)單一基因能同時(shí)控制炎癥,、加速衰老和癌癥,。
紐約大學(xué)Langone醫(yī)學(xué)中心首席研究員Robert J. Schneider博士說:這肯定是一個(gè)意外的發(fā)現(xiàn),。一個(gè)基因同時(shí)在控制老化和炎癥過程中有兩個(gè)非常不同的,,但卻是非常重要的功能的現(xiàn)象是比較罕見的,。老化和炎癥如果沒有妥善得到控制緩解,最終可以導(dǎo)致癌癥的發(fā)生于發(fā)展,。
這項(xiàng)研究由美國國立衛(wèi)生研究院資助,,發(fā)表于5月24日的Molecular Cell雜志上。
Schneider博士說:近幾十年來,,科學(xué)界已知炎癥,、衰老的加速以及癌癥是交織在一起的,,但它們之間的相互關(guān)系基本上是一個(gè)謎,。Schneider和他的團(tuán)隊(duì)在過去的研究中,發(fā)現(xiàn)AUF1通過關(guān)閉炎癥反應(yīng),,阻止感染性休克基因能控制炎癥,。雖然研究成果很杰出,但這一發(fā)現(xiàn)并沒有解釋老化加速與癌癥的關(guān)聯(lián),。
當(dāng)研究人員敲除AUF1基因會(huì)加速老化的發(fā)生,,研究人員將研究工作中斷集中于這一基因上?,F(xiàn)在,有關(guān)炎癥,、衰老加速和癌癥之間關(guān)聯(lián)的神秘面紗終于被揭開了,。
Schneider博士解釋說:目前的這項(xiàng)研究表明AUF1(有四個(gè)相關(guān)基因的家族)不僅控制了炎癥反應(yīng),同時(shí)還通過激活端粒酶來修復(fù)染色體末端保持染色體的完整性,,在減少炎癥反應(yīng)的同時(shí),,也防止老化的加速和癌癥的發(fā)展。(生物谷:Bioon.com)
doi:10.1016/j.molcel.2012.04.019
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mRNA Decay Factor AUF1 Maintains Normal Aging, Telomere Maintenance, and Suppression of Senescence by Activation of Telomerase Transcription
Adam R. Pont, Navid Sadri, Susan J. Hsiao, Susan Smith, Robert J. Schneider.
Inflammation is associated with DNA damage, cellular senescence, and aging. Cessation of the inflammatory cytokine response is mediated in part through cytokine mRNA degradation facilitated by RNA-binding proteins, including AUF1. We report a major function of AUF1it activates telomerase expression, suppresses cellular senescence, and maintains normal aging. AUF1-deficient mice undergo striking telomere erosion, markedly increased DNA damage responses at telomere ends, pronounced cellular senescence, and rapid premature aging that increases with successive generations, which can be rescued in AUF1 knockout mice and their cultured cells by resupplying AUF1 expression. AUF1 binds and strongly activates the transcription promoter for telomerase catalytic subunit Tert. In addition to directing inflammatory cytokine mRNA decay, AUF1 destabilizes cell-cycle checkpoint mRNAs, preventing cellular senescence. Thus, a single gene, AUF1, links maintenance of telomere length and normal aging to attenuation of inflammatory cytokine expression and inhibition of cellular senescence