Sch9S6K 控制 DNA 修复和 DNA 损伤反应效率在衰老细胞
Chiara Lucca1, Elisa Ferrari1, Ghadeer Shubassi2
1IFOM ETS - The AIRC Institute of Molecular Oncology, Via Adamello 16, 20139 Milan, Italy.
Cell reports
|May 28, 2024
概括
衰老细胞显示DNA修复和DNA损伤反应 (DDR) 的受损. 通过抑制TORC1-Sch9信号传递,通过调节蛋白酸酶2A (PP2A) 活性,恢复DNA修复并增强老细胞中的DDR.
科学领域:
- 细胞衰老 细胞衰老
- DNA 修复机制的修复机制
- 基因损伤反应 (DDR) 是一种对DNA损伤的反应.
背景情况:
- 在紫外线引起的DNA损伤中生存需要核酸切除修复 (NER) 和Mec1ATRDNA损伤反应 (DDR).
- 衰老细胞表现出DNA修复能力减弱和DDR激活功能受损.
研究的目的:
- 调查与年龄相关的DDR和NER下降背后的机制.
- 确定药理和遗传策略,以拯救衰老细胞中的DDR和NER功能.
主要方法:
- 利用药理和遗传方法调节细胞通路.
- 研究了Snf1AMPK,TORC1-Sch9S6K轴和PP2A活动在衰老细胞中的作用.
- 分析了与DDR和NER效率相关的Sch9S6K (Ser160和Ser163) 上的特定酸化位点.
主要成果:
- 在老化的细胞中,激活Snf1AMPK可以挽救DDR,但不能激活NER功能.
- 通过调整PP2A活动,抑制TORC1-Sch9S6K轴恢复了NER和增强了DDR.
- 与年龄相关的修复缺陷与Snf1AMPK介导的Sch9S6K的酸化有关.
- 衰老细胞中的PP2A活性对DDR产生了负面影响,并调节了Snf1AMPK和Sch9S6K的活动.
结论:
- 细胞衰老会损害DNA修复和DDR,受代谢网络 (AMPK,TORC1) 和PP2A活动的影响.
- 针对TORC1-Sch9轴和管理PP2A活动可以恢复DNA修复和老化细胞中的DDR.
- 在老化过程中,特定的Sch9S6K酸化模式对DDR和NER效率至关重要.
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