内皮LRRC8C与LRRC8A和LRRC8B结合,调节血管反应和血压
bioRxiv : the preprint server for biology
|September 2, 2025
概括
富含白的重复含有蛋白8C (LRRC8C) 对于血管功能至关重要,调节血压和内皮氧化合成酶信号. 它的缺失会影响血管扩张,并加重高血压.
科学领域:
- 心血管生物学
- 分子生物学
- 内皮功能
背景情况:
- 细胞内皮会感知机械和化学刺激以调节血管度.
- LRRC8A是已知的机械反应性内皮LRRC8复合物的组成部分,影响AKT-内皮氧化合成酶 (eNOS) 信号传递.
- 其他LRRC8家族成员 (LRRC8B-E) 呈现组织特异性表达.
研究的目的:
- 研究LRRC8C在血管功能中的作用及其与血压调节的关联.
- 确定内皮LRRC8复合物的组成及其组件的功能意义.
主要方法:
- 人类遗传研究确定与血压相关的LRRC8C单核酸多态 (SNP).
- 在小鼠肺内皮中进行共免疫沉实验,以确定LRRC8复合物的组成.
- 在小鼠和人类静脉内皮细胞 (HUVEC) 中进行淘汰研究,以评估蛋白质的相互依赖性和功能.
- 评估内皮体积调节性离子通道 (VRAC) 电流,AKT-eNOS信号,肌体调和血管扩张.
主要成果:
- 在LRRC8C中,有两种SNP与静缩和静缩血压升高有很强的联系.
- 内皮LRRC8复合体主要由LRRC8A/B/C异构体组成.
- 与LRRC8D不同的是,LRRC8A,LRRC8B和LRRC8C表现出相互依赖的表达.
- LRRC8A和LRRC8C的耗尽减少了VRAC电流,抑制了AKT- eNOS信号传递,增加了肌体度,降低了血管扩张,并加剧了血管素诱导的高血压.
结论:
- LRRC8A,LRRC8B和LRRC8C是内皮LRRC8复合体的关键组成部分.
- 在调节内皮AKT-eNOS信号,血管放松和对高血压的敏感性方面,LRRC8C起着关键的,非冗余的作用.
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