通过MIEF1进行的线粒体机械传导协调了对力量的核反应
Patrizia Romani1, Giada Benedetti1, Martina Cusan1
1Department of Molecular Medicine, University of Padova, Padova, Italy.
Nature cell biology
|October 21, 2024
概括
机械力量通过控制线粒体动力学来调节细胞行为. 这项研究揭示了由细胞外矩阵刚性和张力影响的线粒体裂变如何影响关键细胞功能和转录因子,提供统一的信号机制.
科学领域:
- 细胞生物学 细胞生物学
- 机械生物学 机械生物学
- 生物物理学的生物物理.
背景情况:
- 组织力学显著影响健康和疾病中的细胞行为.
- 连接机械线索与细胞反应的精确机制,特别是线粒体动力学,尚未完全理解.
研究的目的:
- 研究组织微环境的机械特性如何调节线粒体动力学.
- 阐明线粒体裂变作为机械转导机制的作用.
- 确定线粒体机械调节对细胞功能和转录因子的下游影响.
主要方法:
- 利用小鼠皮肤拉伸模型来应用机械力.
- 研究了线粒体动态的调节,包括裂变和延长因子 (DRP1,MIEF1).
- 评估了线粒体动态对转录因子 (YAP/TAZ,SREBP1/2,NRF2) 和细胞过程的影响.
主要成果:
- 细胞外矩阵的刚性,空间限制和施加的力量调节了线粒体动力学.
- 阿克托米奥辛的张力影响了线粒体延长因子1 (MIEF1) 酸化,影响了与胺相关的蛋白1 (DRP1) 招募和线粒体裂变.
- 由DRP1和MIEF1/2介导的线粒体裂变对于调节YAP/TAZ,SREBP1/2和NRF2至关重要,从而控制细胞增殖,脂质发生,抗氧化剂代谢和化疗耐药性.
- 在小鼠肝脏中,DRP1依赖的线粒体裂变调节肝细胞增殖和YAP依赖的表型.
结论:
- 线粒体裂变作为一个一般的机械传导机制,将机械线索与细胞功能联系起来.
- 作用于组织的机械力量调节线粒体动力学,这反过来又通过转录因子调制调节关键细胞过程.
- 线粒体作为一个中央信号枢纽,整合来自组织微环境的机械信号,协调多种细胞功能.
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