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Nat Commun:DNA损伤促衰老体内新证据

2015-04-14 佚名 生物谷

近日,国际学术期刊nature communication在线发表了美国科学家的一项最新研究进展,他们利用腺病毒系统在小鼠肝脏细胞内制造DNA双链断裂(DSB),在体内证明了DNA损伤会导致肝脏组织衰老,弥补了DNA损伤与组织器官衰老之间的体内证据,对于DNA损伤与衰老研究具有一定意义。   DNA双链断裂是DNA损伤众多类型中的一种,在几乎所有生物中都会发生,这一过程可以受到多种条

近日,国际学术期刊nature communication在线发表了美国科学家的一项最新研究进展,他们利用腺病毒系统在小鼠肝脏细胞内制造DNA双链断裂(DSB),在体内证明了DNA损伤会导致肝脏组织衰老,弥补了DNA损伤与组织器官衰老之间的体内证据,对于DNA损伤与衰老研究具有一定意义。
 
DNA双链断裂是DNA损伤众多类型中的一种,在几乎所有生物中都会发生,这一过程可以受到多种条件的诱导,并且双链断裂会导致基因组重排,因此DSB过程在促进肿瘤发生以及衰老方面具有重要作用。
 
DNA损伤可参与衰老过程,但目前仍缺少直接证据证明两者因果关系,其主要原因是由于在细胞和组织内诱导特定的DNA损伤,同时不损伤其他生物分子和细胞结构存在困难。在该研究中,研究人员利用腺病毒系统在细胞内表达四环素调节的SacI 限制性内切酶,进而检测高毒性的DNA双链损伤是否会驱动衰老表型的出现。研究人员将腺病毒注入小鼠体内,然后将肝脏内的分子与细胞与正常衰老的小鼠进行了对比。对3月龄的小鼠进行了病毒处理后,发现其表现出许多特征,包括衰老的病理特征,出现细胞衰老的标记,线粒体发生融合,并且基因表达谱也出现改变。
 
综上所述,这些结果表明DNA双链断裂会在小鼠肝脏造成衰老表型,为研究DNA损伤在驱动组织衰老方面的作用提供了新的见解。

原始出处:

Ryan R. White, Brandon Milholland, Alain de Bruin, Samuel Curran,Remi-Martin Laberge, Harry van Steeg,Judith Campisi,Alexander Y. Maslov& Jan Vijg.Controlled induction of DNA double-strand breaks in the mouse liver induces features of tissue ageing.Nature Communications, April 10, 2015; doi:10.1038/ncomms7790

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    2016-01-31 liye789132251
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    2015-08-10 liuli5079
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