内皮TRPV4-Cx43信号综合体调节阻力动脉中的血管运动度
Pía C Burboa1, Pablo S Gaete2, Ping Shu1
1Department of Pharmacology, Physiology and Neuroscience, Rutgers-New Jersey Medical School, Newark, NJ, USA.
The Journal of physiology
|February 21, 2025
概括
瞬态受体潜在化物4 (TRPV4) 通道通过S-化激活连xin 43 (Cx43) 半通道,调节内皮细胞通信和血管度. 这种TRPV4-Cx43信号通路对于内皮功能和血管扩张至关重要.
科学领域:
- 血管生物学 血管生物学
- 细胞生理学 细胞生理学
- 生物化学 生物化学
背景情况:
- 连素43 (Cx43) 间隙结通道的S-化调节细胞通信,但其在血管运动控制中的作用尚不清楚.
- 内皮暂时受体潜在化物4 (TRPV4) 通道通过氧化 (NO) 生产促进血管扩张.
研究的目的:
- 通过TRPV4通道激活来研究内皮Cx43半通道的直接调制.
- 阐明TRPV4-Cx43信号通路在内皮电行为和血管运动调节中的作用.
主要方法:
- 近距离结合试验,以评估抵抗动脉内皮中的Cx43和TRPV4近距离.
- 初级内皮细胞 (EC) 培养物和ex vivo介质动脉.
- GSK 1016790A (TRPV4激活剂),β-环氧 (脂质破坏剂) 和Cx43半通道抑制剂.
- 测量ENOS活动,NO产量,细胞内Ca2+水平和内皮质超极化.
- 在体内对小鼠中肠动脉小动脉进行肠道显微镜.
主要成果:
- 在EC中TRPV4的激活增强了eNOS活动,增加了NO的产生,并通过S-化开启了Cx43半通道.
- 阻断Cx43半通道降低了TRPV4激活引起的高细胞内Ca2+水平.
- 抑制Cx43半通道损害了中腔动脉中的内皮质极极化.
- 通过脂质扰扰乱扰乱Cx43/TRPV4的近距离,使半通道活动和内皮细胞超极化变得模糊.
- 在体内,抑制Cx43半通道活性减少了TRPV4诱导的血管扩张.
结论:
- 在阻力动脉的内皮细胞中,TRPV4和Cx43相邻,形成一个功能单元.
- TRPV4的激活导致S-化和Cx43半通道的开放,影响细胞内和内皮的电行为.
- TRPV4-Cx43信号通路在调节内皮电行为和血管运动调节中发挥着关键作用,有助于血管扩张.
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