因子VIIa通过激活酸米林酶,从内皮细胞中释放富含酸的细胞外囊泡
Kaushik Das1, Shiva Keshava1, Tanmoy Mukherjee1
1Department of Cellular and Molecular Biology, UT Tyler School of Medicine, The University of Texas Health Science Center at Tyler, Tyler, TX, USA.
Journal of thrombosis and haemostasis : JTH
|October 24, 2023
概括
激活的第七因子 (FVIIa) 释放了富含脂素 (PS) 的细胞外囊泡 (EVs). 这一由酸髓酶 (aSMase) 介导的过程对FVIIa具有至关重要的作用.
科学领域:
- 内分泌学和新陈代谢学
- 血液学 血液学 血液学
- 细胞生物学 细胞生物学
背景情况:
- 已知激活的第七因子 (FVIIa) 可以从内皮细胞释放细胞外囊泡 (EV).
- 这些由FVIIa释放的EVs富含氨酸氨酸 (PS) 并有助于在血栓塞性减小和血友病等疾病中实现静血.
研究的目的:
- 阐明FVIIa诱导EV生物发生的机制.
- 了解FVIIa如何用脂胺 (PS) 丰富这些EV.
主要方法:
- 研究了FVIIa诱导的酸髓酶 (aSMase) 的激活及其细胞表面转位.
- 利用siRNA和抑制剂来评估aSMase在EV生物发生和PS丰富中的作用.
- 在野生型和aSMase淘汰赛小鼠中量化循环EV及其静血潜力.
主要成果:
- FVIIa激活aSMase,导致PS外部化和从内皮细胞释放EV.
- 由FVIIa诱导的aSMase激活产生了胺,并调高了跨膜蛋白16F.
- 在体内研究表明,在aSMase淘汰赛小鼠中,FVIIa诱导的EV释放受损,影响了血静性纠正的血栓塞缩小症.
结论:
- 确定了一种新的机制,其中FVIIa介导的aSMase激活驱动PS外部化和释放PS丰富的EVs.
- 这一途径对于FVIIa在血小板缺血模型中的血静效应至关重要.
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