在细胞中,RhoB在超度诱导的细胞收缩中起着中心作用
Mariangela Centrone1, Ilaria Saltarella2, Mariagrazia D'Agostino1
1Department of Biosciences Biotechnologies and Environment, University of Bari Aldo Moro, Bari, Italy.
Journal of cellular physiology
|July 1, 2024
概括
RhoB 蛋白调节细胞体积和细胞亡. 抑制其法尼基化会阻止正常体积的减少,并增加细胞死亡,这表明RhoBB.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 脏生理学 脏生理学
背景情况:
- 小型Rho GTP结合蛋白是细胞形态,功能和细胞亡的关键调节者.
- 在Rho蛋白中,RhoB是独一无二的,因为它可以经历geranylgeranylation或farnesylation,使其成为farnesyltransferase抑制剂 (FTIs) 的目标.
- 之前的研究表明RhoB激活通过高度和细胞大小调节中的潜在作用.
研究的目的:
- 研究RhoB在细胞对透应激反应中的作用,特别是体积减小.
- 为了确定抑制RhoB化对细胞体积调节和细胞亡的影响.
- 阐明RhoB在对细胞体积变化的反应中控制亡的功能.
主要方法:
- 使用光共振能量转移 (FRET) 来评估在不同度下RhoB活动.
- 使用RhoB结构的收管MCD4和人类HK-2细胞的过渡性转移 (野生类型和法尼西拉缺陷突变).
- 评估细胞体积变化,使用基于素的光分析和3D激光扫描共聚焦显微镜 (3D-LSCM).
- 通过流细胞计分析量化细胞亡.
主要成果:
- 超度显著增加了RhoB活性,但不受低度的影响.
- 使用FTI-277抑制RhoB法尼基化或表达法尼基化缺陷RhoB突变体 (RhoB-CLLL-EGFP) 在超度下损害了正常细胞体积的减少.
- 与对照细胞相比,抑制RhoB法尼西化的细胞表现出增加的亡.
结论:
- RhoB是细胞对高位压力反应的关键调解者.
- 对于适当的细胞体积调节,RhoB的法尼基化是必不可少的.
- 抑制RhoB的法内基化促进了细胞亡,这表明RhoB在将细胞体积变化与细胞亡途径联系起关键作用.
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