性细胞内pH值 (pHi) 增加PI3K活动,促进mTORC1和mTORC2信号传递和生长因子限制期间的功能
Dubek Kazyken1, Stephen I Lentz2, Maxwell Wadley1
1Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, Michigan, USA.
The Journal of biological chemistry
|July 28, 2023
概括
性细胞内pH值激活PI3K-mTOR信号,通过模仿生长因子信号来促进癌细胞的生长和生存. 这一发现揭示了在营养压力下癌细胞增殖的关键机制.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生化学
- 癌症生物学 癌症生物学
背景情况:
- 拉巴胺素 (mTOR) 激酶的机械性标通过mTOR复合体1 (mTORC1) 和mTOR复合体2 (mTORC2) 调节细胞代谢,生长和生存.
- 性细胞内pH值 (pHi) 是癌细胞的标志,促进瘤性行为.
- 控制mTOR信号传递的机制,特别是在压力下,尚未完全理解.
研究的目的:
- 研究性细胞内pH值如何影响mTORC1和mTORC2信号通路.
- 阐明性pHi在调节细胞代谢,蛋白质合成和亡中的作用.
- 了解性pHi对癌细胞存活和增殖的影响.
主要方法:
- 研究了性pHi对酸氨基酸 3-激酶 (PI3K) 活性的影响.
- 分析了mTORC1和mTORC2信号通路,使用西式涂抹和蛋白分析.
- 在改变pHi的细胞中评估了cap-dependent蛋白质合成和细胞亡.
主要成果:
- 性pHi增强PI3K活动,激活mTORC1和mTORC2信号,独立于生长因子.
- 性pHi通过PI3K-Akt信号激活mTORC1,包括型硬化综合体2的酸化和40kDa的富含proline的Akt基质.
- 性pHi以PI3K和mTOR依赖的方式促进卡普依赖的蛋白质合成,并抑制细胞亡.
结论:
- 性细胞内pH值模仿生长因子-PI3K信号传递,驱动mtORC1和mtORC2的激活.
- 由于性pHi导致PI3K-mTOR信号的升高,支持在营养限制条件下癌细胞的增殖和生存.
- 向性pHi可能是抑制癌症进展的治疗策略.
关键词:
这就是Akt PKB的PKB.在PI3K中,PI3K是指PI3K.这就是S6酶.灭症 (apoptosis) 是一种死亡的过程.细胞信号传递是细胞的信号传递.单核细胞翻译启动因子4E细胞转化启动因子4E结合蛋白质调节pH值的方法蛋白质合成 蛋白质合成拉帕米的目标是拉帕米.更多相关视频
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