在小鼠中,Rap1小GTPase对于维持肺内皮屏障功能至关重要
Kiyotake Yamamoto1,2,3, Haruko Watanabe-Takano1, Eri Oguri-Nakamura1
1Department of Molecular Pathophysiology, Institute for Advanced Medical Sciences, Nippon Medical School, Tokyo, Japan.
概括
Rap1,一个小的GTPase,对于维持肺内皮屏障功能至关重要. 它稳定细胞结点,防止炎症期间的血管泄漏,保护肺部健康.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生理学 生理学 生理学
背景情况:
- 血管透性是由VE-cadherin在内皮细胞结合处调节的.
- 损伤的结节会导致超透性,这与疾病的进展有关.
- 肺炎和感染往往导致肺血管泄漏.
研究的目的:
- 调查小GTPase Rap1在维持肺内皮膜屏障功能的作用.
- 了解Rap1在调节VE-cadherin介导的细胞粘附中的机制.
- 评估Rap1对肺部炎症诱导的血管泄漏的保护作用.
主要方法:
- 产生的内皮细胞特异性Rap1a/Rap1b双淘汰赛小鼠.
- 利用面对面和3D免疫光分析小鼠肺部和肺动脉.
- 给药的脂聚糖 (LPS) 和一个EPAC激活剂 (007) 来评估血管透性.
主要成果:
- 拉普1淘汰赛小鼠出现严重的肺和心血管泄漏.
- 拉普1通过actin细胞骨架重组稳定VE-cadherin结点,抑制Rho-ROCK-NM-II并促进结点NM-II.
- 拉普1缺陷增加了对LPS诱导泄漏的易感性;007激活拉普1减轻了这种泄漏.
结论:
- 在生理条件下,Rap1对于保持肺内皮屏障完整性至关重要.
- 拉普1通过加强内皮细胞-细胞结合,防止炎症诱导的肺血管泄漏.
- 针对Rap1信号可能为炎症性肺部疾病提供治疗策略.
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