Nat Cell Biol:揭示细胞癌变的根源

2013-11-27 佚名 生物通

根据发表在《自然细胞生物学》(Nature Cell Biology)的一篇新研究论文所述,发生于晚年的癌症有可能是因为我们细胞衰老的方式所导致。 来自英国Beatson癌症研究所的科学家们发现,一些癌症或许不能完全归因为遗传损伤,而是衰老细胞绕过了告诉它们停止生长的开关所引起。 通过研究实验室培育的人类细胞,该研究小组发现接近生命周期尽头的细胞对于称作为甲基化

根据发表在《自然细胞生物学》(Nature Cell Biology)的一篇新研究论文所述,发生于晚年的癌症有可能是因为我们细胞衰老的方式所导致。 【原文下载】

来自英国Beatson癌症研究所的科学家们发现,一些癌症或许不能完全归因为遗传损伤,而是衰老细胞绕过了告诉它们停止生长的开关所引起。

通过研究实验室培育的人类细胞,该研究小组发现接近生命周期尽头的细胞对于称作为甲基化的DNA化学标记过程的控制能力开始减弱。他们还在癌细胞中看到了相似的这种化学标记模式。

老化细胞通常会经过一个称之为衰老(senescence)的过程,停止增殖并进入到一种“睡眠”状态。研究人员认为,化学标记变化有可能促进了细胞癌变,使得它们能够设法绕过正常的衰老过程,再度“苏醒”。

甲基化通过给基因添加“标签”,控制它们开启或关闭的时间,发挥重要的作用告知细胞该如何行动。

研究作者之一,英国癌症研究所Peter Adams教授说:“尽管衰老是大多数癌症最大的一个风险因子,对于其原因我们仍然了解甚少。在这项研究中,我们证实衰老细胞的行为与正常细胞存在很大差异。我们知道当出现错误或细胞过于衰老时,一些机制会让细胞停止生长,这是阻止肿瘤形成的一种保险方法。”

“而衰老细胞与癌细胞之间的行为存在相似之处表明,如果衰老细胞设法逃脱死亡,它们有潜力变为癌症。

“我们的研究工作可能有助于解释随着年龄的增长以及所有细胞和组织的衰老,我们的癌症风险相应增高的原因。“

英国癌症研究所科学传媒部主管Kat Arney博士说:“我们才刚刚开始了解与我们细胞相关的这一复杂机器有时是如何导致癌症的。这项研究提供了进一步的证据证实:随着我们细胞的衰老,它们会变得更加容易癌变。”

“了解癌症相关的基础过程对于获得关于治疗和预防癌症的一些新见解,提前实现治愈所有的癌症具有至关重要的意义。”

原文出处:

Cruickshanks HA, McBryan T, Nelson DM, Vanderkraats ND, Shah PP, van Tuyn J, Singh Rai T, Brock C, Donahue G, Dunican DS, Drotar ME, Meehan RR, Edwards JR, Berger SL, Adams PD.Senescent cells harbour features of the cancer epigenome.Nat Cell Biol. 2013 Nov 24. doi: 10.1038/ncb2879. 【原文下载】

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    2014-02-27 维他命
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    2014-06-26 liye789132251
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    2014-07-28 sunylz
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    2013-11-29 axin014

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