依赖于Ca2+的囊泡和非囊泡脂质转移控制了低的血膜扩张
Baicong Mu1,2, David M Rutkowski3, Gianluca Grenci4
1Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, 117604, Singapore.
bioRxiv : the preprint server for biology
|November 1, 2024
概括
细胞通过依赖的膜添加在胀期间保持完整性. 机械敏感通道触发脂质转移和细胞外转移,以扩展血膜 (PM) 并防止破裂.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 膜动力学 膜动力学
背景情况:
- 细胞完整性依赖于协调表面和体积的变化.
- 细胞胀期间等离子体膜 (PM) 的重塑尚未完全理解.
- 检测和重新排列颗粒物的机制需要进一步阐明.
研究的目的:
- 为了研究在低度细胞胀期间增加PM的Ca2+依赖机制.
- 为了确定关键的分子参与者在维护PM完整性在透应激下.
- 了解细胞如何动态地适应其表面和体积.
主要方法:
- 在实验研究中利用了裂变酵母原塑.
- 研究的Ca2+流入通过类似MscS的机械敏感通道.
- 检查了包括扩展-synaptotagmins在内的内等质网膜 (ER) -PM接触部位的脂质转移.
- 分析了外细胞在膜扩张中的作用.
- 采用数值模拟用于低透膨胀建模.
主要成果:
- 发现了一种依赖于Ca2+的PM添加机制,这对于胀期间细胞存活至关重要.
- 由PM张力激活的MscS类通道,调节Ca2+流入.
- 细胞外Ca2+触发了通过扩展-synaptotagmins的脂质转移,并加速了外细胞形成.
- 这些过程中的缺陷会导致原生质细胞在低压冲击下破裂.
- 模拟显示了一种双重策略,即非膀性脂质转移和膜适应的外细胞分裂.
结论:
- 一个新的Ca2+-依赖的途径确保PM完整性和扩张在透性胀期间.
- 这种机制整合了机械感知,脂质转移和膜贩运.
- 这些发现提供了关于细胞战略的洞察力,用于显著的表面和体积适应.
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