细胞内膜网膜的破坏刺激了核膜的机械传导
Zhouyang Shen1,2,3, Zaza Gelashvili1,2, Philipp Niethammer4
1Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
细胞质脂酶A2 (cPLA2) 活性由核膜张力调节. 细胞内网膜连接的破坏触发了这种机制传导,影响了炎症性脂质的产生.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 分子生物学分子生物学
背景情况:
- 细胞酸酶A2 (cPLA2) 从内核膜 (INM) 释放阿拉基酸,这是产生炎症性脂质的关键步骤.
- 离子 (Ca2+) 和INM张力 (TINM) 是cPLA2在INM的假设调节者.
- 细胞内膜网 (ER) 膜流在缓冲TINM中的作用及其对机械传导的影响仍然不清楚.
研究的目的:
- 调查ER是否缓冲TINM,并阐明控制核膜机械传导的条件.
- 开发一种新的生物传感器,以独立于Ca2+测量INM张力.
主要方法:
- 开发了对Ca2+不敏感的INM张力生物传感器,ALPIN (核内部的两性脂质包装域).
- 对ALPIN和cPLA2与INM相互作用的同焦时间间隔成像.
- 同时监测ER形态,核形状/体积和细胞溶解.
- 将ALPIN成像与Ca2+诱导的ER干扰结合起来,以确定因果关系.
主要成果:
- 在受压力的哺乳动物细胞和体内斑马鱼模型中观察到TINM和破坏的ER-核膜连接性之间的相关性.
- 来自ER的补偿膜流缓冲TINM,但不会阻止它.
- 在细胞应激和死亡期间的ER中断是核膜机械传导的触发因素.
结论:
- 这项研究巩固了通过核变形激活cPLA2的生物力学基础.
- 在调节核膜张力方面,ER膜动力学起着至关重要的作用.
- 认定ER中断是核膜机械传导的新型触发因素,影响炎症途径.
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