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通过ROS减弱ATM信号,延迟在生理氧气下复制性衰老

Alexander J Stuart¹, Kaori K Takai¹, Railia R Gabbasova²

¹Laboratory for Cell Biology and Genetics, New York, NY, USA.

|December 2, 2025

概括

通过感知短端粒,ATM激酶驱动细胞衰老. 生理氧水平减弱ATM活动,延长细胞寿命,并通过端粒缩短影响瘤抑制.

科学领域:

细胞生物学细胞生物学
在瘤学瘤学.
遗传学遗传学是一个

背景情况:

复制性衰老是一种瘤抑制机制,由关键短端粒触发,激活DNA损伤反应 (DDR).
ATAM (转基因突变的ataxia-telangiectasia) 是DDR通路中的一个关键激酶.

研究的目的:

为了确定负责复制性衰老的特定DDR激酶.
研究氧气水平在细胞寿命和ATM活动中的作用.
阐明生理氧气影响ATM对DNA损伤反应的机制.

主要方法:

利用在生理 (3%) 和大气 (20%) 氧气水平上培养的初级纤维细胞.
评估了ATM激酶在诱导和维持复制性衰老中的作用.
在不同氧气条件下对双链断裂 (DSB) 和未受保护的端粒的ATM反应进行了研究.
分析了活性氧物种 (ROS) 对ATM二元体形成和活性的影响.

主要成果:

ATM被确定为唯一的DDR激酶,对于诱导和维持复制性衰老至关重要.
在老化的细胞中,ATM抑制恢复了正常的细胞分裂.
初级纤维细胞在3%的氧气下表现出延长的复制寿命,而在20%的氧气下表现出延长的复制寿命.
这种在3%氧气下延长的寿命是由于ATM对DSB和不受保护的端粒的反应减弱.
在3%的氧气中增加的ROS导致了二硫化物交叉连接的ATM度器,损害了ATM对DSB的响应.

结论:

ATM 激酶是复制性衰老的中央调节者.
生理氧气水平减弱了ATM信号,延长了细胞寿命.
这种以氧为媒介的ATM活动调节对端粒驱动的瘤抑制有重大影响.

关键词:

这是一个ATMATMATM.在DDR中,DDR是指DDR.草花的花草花的花草花.这就是ROSOS ROS.在 TRF2 中,TRF2 是 TRF2.癌症癌症癌症癌症癌症缺氧缺氧是指缺氧的情况.氧气氧气氧气氧气衰老是一种老化.端粒是什么意思端粒是什么意思

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