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ARHGEF18是一种流量响应的交换因子,控制内皮紧接点和血管泄漏
Surya Prakash Rao Batta1, Marc Rio1, Corentin Lebot1
1Université de Nantes, CHU Nantes, CNRS, INSERM, l'institut du thorax, 44000 Nantes, France.
Cell reports
|February 20, 2025
概括
血流造成的剪切压力调节了内皮细胞. 研究人员发现ARHGEF18是一种流量敏感的RhoGEF,是维持细胞结合和控制血管透性的关键.
科学领域:
- 血管生物学 血管生物学
- 细胞机械传导是细胞的机械传导.
- 内皮细胞生物学 内皮细胞生物学
背景情况:
- 血流剪切应激显著影响内皮细胞 (EC) 生物学和形态学.
- 罗蛋白信号传递和细胞骨重塑是ECs对剪切应激的关键早期反应.
- 剪切应力控制Rho蛋白信号传递的精确机制在很大程度上是未知的.
研究的目的:
- 研究RhoGEF蛋白在调解EC对剪切应力的反应中的作用.
- 为了识别对剪切应力强度敏感的特定RhoGEF蛋白质.
- 阐明切割敏感RhoGEF在内皮屏障完整性和血管透性中的功能.
主要方法:
- 在不同剪切应力条件下研究了EC中ARHGEF18的酸化,活性和表达.
- 检查了化ARHGEF18与紧密连接的相互作用.
- 利用小鼠模型在体内评估ARHGEF18的功能,重点关注紧密的结形成,EC流响应和血管透性.
主要成果:
- ARHGEF18的酸化,活性和表达是由ECs的剪切应力大小调节的.
- 化ARHGEF18与紧密的接口相互作用,并参与EC延长,对齐和迁移.
- ARHGEF18对于维持内皮屏障和控制体内血管透性至关重要.
结论:
- ARHGEF18被确定为内皮细胞中第一个切割应激敏感的RhoGEF.
- 在流动下,ARHGEF18的活性对于维持细胞间接口至关重要.
- 在体内,ARHGEF18在调节血管透性方面发挥着至关重要的作用.
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