LRRC8A阴离子通道通过与米奥辛酸酶-rho相互作用蛋白的关联来调节血管反应
Hyehun Choi1, Michael R Miller1, Hong-Ngan Nguyen1
1Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
概括
含有8A (LRRC8A) 的氨酸丰富的重复体积调节离子通道 (VRACs) 调节血管光滑肌细胞功能. 删除LRRC8A可以增强血管扩张,并防止TNFα诱导的血管收缩,这表明VRAC是血管疾病的关键标.
科学领域:
- 血管生物学 血管生物学
- 离子通道 离子通道
- 细胞信号传递 细胞信号传递
背景情况:
- 含有8A (LRRC8A) 的富含白素的重复形成由炎症刺激激活的体积调节离子通道 (VRAC).
- LRRC8A通道与NADPH氧化酶1 (Nox1) 相结合,支持超氧化物生成,并可能影响血管度.
研究的目的:
- 研究LRRC8A在血管光滑肌细胞 (VSMC) 中调节TNFα信号传递和血管运动功能的作用.
- 测试假设VRACs调节血管反应,并参与TNFα诱导的血管功能障碍.
主要方法:
- 在VSMCs (Sm22α-Cre,Knockout) 中产生了缺乏LRRC8A的小鼠.
- 评估了对各种刺激的中腔血管收缩和放松反应 (上腺素,乙胆,化).
- 使用了ex vivoTNFα暴露,VRAC阻塞 (碳醇),免疫沉,质谱,对焦成像和RhoA活性测试.
主要成果:
- LRRC8A淘汰赛 (KO) 容器对乙胆和酸的放松性增强,缺乏肌体度.
- 暴露于TNFα在野生型血管中损害了血管扩张,但在KO血管中没有.
- LRRC8A与肌酸酸酶rho相互作用蛋白 (MPRIP) 相互作用,其缺席或阻断降低了RhoA活性和MYPT1酸化,表明ROCK活性降低.
- 暴露于TNFα导致MPRIP的氧化,这表明通过LRRC8A-Nox1相互作用对细胞骨的氧化还原调节机制.
结论:
- 在VSMC中的LRRC8A通道是血管度和对TNFα等炎症刺激的反应的关键调节者.
- LRRC8A-MPRIP相互作用提供了Nox1衍生的超氧化物生产和细胞骨调节之间的联系,影响血管扩张.
- 向VRAC可能为预防或治疗与炎症和血管扩张受损相关的血管疾病提供治疗策略.
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