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EPHB4-RASA1 PIEZO1 Ras激活的抑制驱动淋巴膜发生

Di Chen¹, Yipei Tang¹, Philip E Lapinski¹

¹Department of Microbiology and Immunology, University of Michigan Medical School, Arbor (D.C., Y.T., P.E.L., P.D.K.).

Circulation research

|October 18, 2024

概括

乙受体B4 (EPHB4) 和p120 Ras GTPase激活蛋白 (RASA1) 对于淋巴血管门的发育至关重要. 它们的物理相互作用限制了Ras-MAPK通路的激活,确保了适当的门形成和维护.

科学领域:

血管生物学血管生物学
细胞信号传递细胞信号传递
发育生物学是发展生物学.

背景情况:

淋巴血管 (LV) 门的发育对于适当的淋巴功能至关重要.
已知以弗林受体B4 (EPHB4) 和p120 Ras GTPase激活蛋白 (RASA1) 对于LV形成是必要的.
通过EPHB4和RASA1调节LV发育的精确分子机制在很大程度上是未知的.

研究的目的:

阐明EPHB4和RASA1调节淋巴血管膜发育的机制.
调查EPHB4和RASA1在LV形成和维护中的物理相互作用的作用.

主要方法:

利用特定于LV的诱导性EPHB4缺陷和EPHB4 knockin小鼠 (EPHB4 2YP) 来研究胚胎发育和成人维护.
在实验室中使用人体皮肤淋巴内皮细胞来检查EPHB4和RASA1对振荡剪切应激反应的作用.
研究了Ras-MAPK信号通路抑制和PIEZO1激活对LV发育的影响.

主要成果:

失去EPHB4或破坏EPHB4-RASA1相互作用阻断了LV的规格,开发和维护.
抑制Ras-MAPK通路可以挽救LV开发中的缺陷.
EPHB4-RASA1相互作用对于抑制Ras-MAPK激活至关重要,这种激活是由通过淋巴内皮细胞中的PIEZO1传感器的振荡剪切应力引起的.

结论:

EPHB4和RASA1对于淋巴血管门的规范,规范后的开发和维护是不可或缺的.
需要EPHB4和RASA1之间的物理相互作用来限制Ras-MAPK通路在淋巴内皮细胞中的激活.
EPHB4-RASA1复合体起到关键的调节作用,调节PIEZO1介导的信号,以控制Ras-MAPK活动并确保LV的适当发育.

关键词:

激活GTP酶的蛋白质它们是内皮细胞.淋巴血管中的淋巴血管.接收器,Ef家族的接收器信号传导的信号传导.

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