MAPK信号和 ангиопоэтин-2 促进毛细血管形的内皮透气性
bioRxiv : the preprint server for biology
|April 16, 2025
概括
斯特格·韦伯综合征 (SWS) 中的毛细血管形 (CM) 是由于GNAQ突变导致内皮屏障缺陷造成的. 与Trametinib一样,将ANGPT2敲击与MEK抑制相结合,有效地恢复了受影响细胞中的这种受损屏障.
科学领域:
- 血管生物学 血管生物学
- 遗传学 是一个遗传学.
- 皮肤病学 皮肤病学
背景情况:
- 毛细血管形 (CM) 是一种先天性血管异常,通常以皮肤病变的形式出现.
- 斯特格·韦伯综合征 (SWS) 涉及皮肤,大脑 (leptomeninges) 和眼睛的CM,与体质GNAQ突变有关.
- 内皮细胞 (ECs) 中的GNAQ R183Q突变与CM病变发生和血管透性有关.
研究的目的:
- 研究GNAQ R183Q突变在内皮屏障功能中的作用.
- 确定分子途径和潜在的治疗点,以恢复CM和SWS中的内皮完整性.
- 确认SWS病变中的血管完整性受损,并建模突变的马赛克性质.
主要方法:
- 在人体EC中使用CRISPR编辑的GNAQ R183Q.使用跨内皮电阻 (TEER) 测定来评估内皮屏障完整性.
- 使用 angiopoietin-2 (ANGPT2) 敲除和 MEK1,2 抑制 (Trametinib) 来测试屏障恢复.
- 在小鼠模型中通过马修斯蓝色染色,MRI成像和埃文斯蓝色染料 perfusion 确认了这一发现.
主要成果:
- 与野生类型的EC相比,GNAQ R183Q突变EC的屏障功能显著降低.
- 抑制ANGPT2和抑制MEK1,2独立地部分恢复了内皮屏障.
- 结合的ANGPT2抑制和特拉美替尼治疗显著恢复了EC屏障,接近野生类型的水平.
结论:
- GNAQ p.R183Q突变损害了内皮屏障的完整性,导致CM和SWS血管病理.
- 在GNAQ驱动的内皮屏障缺陷中,MAPK/ERK信号传递和ANGPT2起着至关重要的作用.
- 针对ANGPT2和MAPK信号的组合疗法在与GNAQ相关的血管形中显示出恢复血管完整性的巨大潜力.
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