FOXO3 signalling links ATM to the p53 apoptotic pathway following DNA damage.

FOXO3 signalling links ATM to the p53 apoptotic pathway following DNA damage.
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DOI:
10.1038/ncomms2008
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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由于环境压力导致的DNA损伤被传感器蛋白识别,其触发修复机制,或者如果修复不成功,则启动细胞凋亡。DNA损伤诱导的细胞凋亡缺陷促进基因组不稳定和肿瘤发生。蛋白共济失调-毛细血管扩张突变(ATM)被DNA双链断裂激活,并通过p53调节细胞凋亡。在这里,我们发现FOXO 3与ATM-Chk 2-p53复合物相互作用,增强复合物的磷酸化,并诱导DNA损伤后细胞核灶的形成。FOXO 3是DNA损伤诱导的细胞凋亡所必需的,相反,FOXO 3需要ATM、Chk 2和磷酸化的p53亚型来触发DNA损伤导致的细胞凋亡。在这些条件下,FOXO 3也可能在调节磷酸化p53的染色质保留中发挥作用。这些结果表明FOXO 3和ATM-Chk 2-p53介导的DNA损伤后的凋亡程序之间的重要联系。
DNA damage as a result of environmental stress is recognized by sensor proteins that trigger repair mechanisms, or, if repair is unsuccessful, initiate apoptosis. Defects in DNA damage-induced apoptosis promote genomic instability and tumorigenesis. The protein ataxia-telangiectasia mutated (ATM) is activated by DNA double strand breaks and regulates apoptosis via p53. Here we show that FOXO3 interacts with the ATM-Chk2-p53 complex, augments phosphorylation of the complex and induces the formation of nuclear foci in cells upon DNA damage. FOXO3 is essential for DNA damage-induced apoptosis and conversely FOXO3 requires ATM, Chk2, and phosphorylated p53 isoforms to trigger apoptosis as a result of DNA damage. Under these conditions FOXO3 may also play a role in regulating chromatin retention of phosphorylated p53. These results suggest an essential link between FOXO3 and the ATM-Chk2-p53-mediated apoptotic program following DNA damage.
DOI: 10.1016/s0092-8674(00)80595-4
发表时间: 1999-03-19
期刊: CELL
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