内皮RAP1A通过抑制RAF1-介导的Notch激活来减弱阴侧毛细体和肝纤维化
Guangwen Chen1, Weiming Dai2, Junjun Wang1
1Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Gut
|February 11, 2026
概括
肝脏阴侧内皮细胞 (LSEC) 中的Ras相关蛋白1A (RAP1A) 缺乏通过激活Notch信号来促进毛细化和肝纤维化. RAP1A对于LSEC恒温是必不可少的,也是肝纤维化的潜在治疗点.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 内皮细胞生物学 内皮细胞生物学
- 纤维化分子机制的分子机制
背景情况:
- 肝内皮细胞 (LSEC) 的毛细化是肝纤维化的一个早期事件,促进肝星细胞的激活.
- 拉斯相关蛋白1A (RAP1A) 已涉及肝纤维化,但其在LSEC毛细化中的具体作用尚不清楚.
研究的目的:
- 研究内皮GTPase RAP1A在LSEC毛细化和肝纤维化发展中的作用.
- 阐明RAP1A影响这些过程的分子机制.
主要方法:
- 在小鼠中使用HFHCD,CDAHFD,CCl4或DDC治疗的确立的肝纤维化模型.
- 产生的内皮特异性Rap1a淘汰赛 (Rap1aΔEC) 的小鼠.
- 使用RAP1激活器 (8-pCPT-2'-O-Me-cAMP) 进行治疗干预.
- 评估了LSEC毛细化,肝纤维化和炎症.
主要成果:
- 在纤维化和体外毛细化过程中,LSEC中RAP1A的表达被下调.
- 内皮细胞Rap1a缺乏加速了LSEC毛细体和肝纤维化,加剧了CCl4/DDC引起的损伤.
- RAP1A的损失促进了RAF1的降解,增强了Notch信号激活.
- 药理RAP1A激活减少了LSEC毛细化和肝纤维化.
结论:
- 内皮Rap1a缺陷通过RAF1降解通过Notch信号激活加剧LSEC毛细化和肝纤维化.
- Rap1a对于维持LSEC平衡至关重要.
- Rap1a代表了肝纤维化的有前途的治疗标.
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