通过新的胆固醇合成,ATR促进mTORC1的活性
Naveen Kumar Tangudu1,2, Alexandra N Grumet3, Richard Fang1,2
1Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
EMBO reports
|June 13, 2025
概括
ATR 激酶通过调节胆固醇合成来促进mTORC1的活动,将DNA损伤反应和细胞代谢联系起来. 这种途径在正常细胞和癌细胞中都很活跃,特别是当p16减少时.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 通过反循环,DNA损伤和细胞代谢相互连接.
- ATR和mTORC1是这些通路的关键媒介.
- 在复制应激过程中,ATR调节mTORC1,但机制和基底活性尚不清楚.
研究的目的:
- 研究ATR在基底条件下调节mTORC1活动中的作用.
- 阐明将ATR和mTORC1.1.连接在一起的分子机制.
- 探索p16对ATR-mTORC1轴的影响.
主要方法:
- 细胞培养 (人类的癌细胞和正常细胞,小鼠的正常细胞)
- 通过siRNA介导的淘汰 (p16)
- 西方涂抹是指西方涂抹.
- 胆固醇合成试验的测定.
- 免疫光显微镜的使用方法
主要成果:
- 在基底条件下,ATR在各种细胞类型中促进mTORC1活动.
- 抗击p16增强了癌细胞中的ATR和mTORC1活动.
- 在ATR上调节兰醇合成酶 (LSS),促进胆固醇合成和mTORC1激活.
- 这种依赖ATR的路径独立于CHK1和TSC,与ATM信号不同.
- 通过ATR介导的胆固醇增加与增强的mTOR的溶酶体局部化相关.
结论:
- ATR信号调节胆固醇代谢,以调节mTORC1的活动.
- 这种新的ATR-胆固醇-mTORC1轴提供了DNA损伤反应和细胞代谢之间的联系.
- 这种途径在癌细胞中可能特别重要.
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