ANO1,CaV1.2和IP3R在小鼠肺动脉平滑肌中形成了EC合的局部单元
Elizabeth J Akin1, Joydeep Aoun1, Connor Jimenez1
1Department of Pharmacology and Center of Biomedical Research Excellence (COBRE) for Molecular and Cellular Signal Transduction in the Cardiovascular System , Reno, NV, USA.
The Journal of general physiology
|September 13, 2023
概括
肺动脉光滑肌细胞依赖于阿诺胺-1 (ANO1) 通道,CaV1.2和IP3R来产生持续的收缩. 这些蛋白质形成一个综合体,将信号集成为血管度.
科学领域:
- 生理学 生理学 生理学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 肺动脉光滑肌细胞 (PASMC) 通过Gq蛋白受体信号和 (Ca2+) 振荡来控制血管度.
- 关键的离子通道如CaV1.2,ANO1 (激活化通道) 和IP3R (释放通道) 调节这些Ca2+事件.
- 连接Ca2+振荡与持续PASMC收缩的确切机制尚不清楚.
研究的目的:
- 阐明ANO1,CaV1.2和IP3R在小鼠PASMC的收缩性和Ca2+信号特性中的作用.
- 了解这些组成部分是如何整合的,从而产生持续的肺动脉收缩.
主要方法:
- 在小鼠中利用了光滑肌特定的ANO1除.
- 使用的ANO1,CaV1.2和IP3R的药理抑制.
- 使用Ca2+生物传感器 (GCaMP3/GCaMP6) 评估收缩反应和细胞内Ca2+信号.
- 进行共免疫沉和共聚焦/超分辨率显微镜以调查蛋白质相互作用和局部化.
主要成果:
- 药物阻断或基因废除ANO1,CaV1.2或IP3R,以及Ca2+储存物耗尽,同样抑制了5-HT诱导的声调和Ca2+波.
- 同免疫沉证实ANO1与CaV1.2和IP3R相互作用.
- 显微镜检测显示,PASMC等离子膜附近的ANO1与CaV1.2和IP3R共同组合.
结论:
- 持续的5-HT诱导的肺动脉收缩源于集成的随机Ca2+事件.
- 涉及ANO1,CaV1.2和IP3R的功能性微环境支持这些Ca2+振荡.
- ANO1和CaV1.2可能间接地促进IP3R的循环Ca2+释放,推动Ca2+波的传播和持续的收缩.
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