来自老年个体的人类纤维细胞通过氧化应激引起的复制应激表现出染色体的不稳定性
Kailin Zhu1, Guan Chen1, Yueyi Ren1
1Department of Molecular Oncology, Institute of Development, Aging and Cancer (IDAC), Tohoku University, Sendai, Miyagi, Japan.
npj aging
|November 25, 2025
概括
衰老的人类细胞显示出由于氧化应激,线粒体功能障碍和复制应激增加的无体积,导致染色体不稳定性 (CIN). 抗氧化剂治疗逆转了这些与衰老相关的效应.
科学领域:
- 细胞生物学 细胞生物学
- 衰老研究研究 衰老研究
- 遗传学 遗传学 是一个
背景情况:
- 形细胞随着年龄的增长而增加,这与小鼠的染色体不稳定性 (CIN) 和氧化应激有关.
- 人类细胞比小鼠细胞更能抵抗氧化压力,这使得人类中与衰老相关的CIN现象尚不清楚.
研究的目的:
- 为了调查老年人纤维细胞是否表现出增加的形积分和CIN.
- 确定人类细胞中与衰老相关的CIN的潜在机制,包括氧化应激,复制应激和线粒体功能.
主要方法:
- 从老年和年轻个体中隔离纤维细胞.
- 对动体积分,染色体错分离和微核形成的分析.
- DNA纤维测定,53BP1核体和超细桥梁评估.
- 线粒体反应性氧物种 (ROS) 和膜电位测量.
- 抗氧化剂治疗及其对CIN标记物的影响.
主要成果:
- 衰老的人类纤维细胞显示出增加的无体积,染色体分离错误和微核,表明CIN.
- 复制压力,由DNA纤维测定异常,53BP1核体和超细桥梁所证明,是存在的.
- 观察到线粒体功能障碍,由增加的ROS和减少的膜潜力表明.
- 抗氧化剂治疗降低了染色体误分和微核,并缓解了微管稳定.
结论:
- 人体纤维细胞中与衰老相关的CIN是由线粒体功能障碍引起的氧化应激驱动的.
- 氧化应激会诱导复制应激,这种应激会通过微管稳定先发并导致CIN.
- 哺乳动物细胞中这种保存的衰老机制突出显示了老鼠和人类之间的共同途径,尽管氧化应激抵抗力有所不同.
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