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氧化酸丁胆触发TRPA1和赖诺丁受体依赖的气道光滑肌肉收缩
Jignesh Vaghasiya1,2, Azadeh Dalvand1,2, Anurag Sikarwar1,2
1Department of Physiology and Pathophysiology.
American journal of respiratory cell and molecular biology
|August 8, 2023
概括
氧化脂胆 (OxPCs) 通过触发气道光滑肌肉中的 (Ca2+) 释放,导致支气管狭窄,从而导致喘. 针对TRPA1和RyR通道可能会降低气道的过度响应.
科学领域:
- 肺部医学 肺部医学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 喘病理生物学涉及氧化应激,修改细胞膜和脂.
- 人类肺部的氧化脂胆 (OxPCs) 与呼吸道过敏反应相关,并诱导支气管狭窄.
- 氧化聚合物触发气道光滑肌反应的确切机制尚不清楚.
研究的目的:
- 调查OxPCs刺激细胞内自由Ca2+流的假设,导致气道光滑肌肉收缩.
- 阐明涉及OxPC介导的气道光滑肌反应的特定离子通道和通路.
主要方法:
- 用Fura-2装载的人类呼吸道光滑肌细胞进行培养,以评估细胞内Ca2+流量.
- 氧化1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine (OxPAPC) 已用于刺激细胞.
- 使用了TRPA1,瑞诺丁受体 (RyR) 和循环腺二酸盐核糖的药理学抑制剂.
- 支气管狭窄的测量是在小鼠细切的肺切片.
主要成果:
- 氧PAPC诱导了髓轻链酸化和气道光滑肌细胞中的细胞内Ca2+度 ([Ca2+]i) 的显著增加.
- 持续的[Ca2+]i升高取决于细胞外的Ca2+和TRPA1通道活动.
- 峰值[Ca2+]i是由氨酸受体 (RyR) Ca2+从sarcoplasmic网膜释放的调节,由循环腺二酸盐核糖调节.
- 在肺部切片中,OxPAPC诱导了支气管狭窄,通过抑制TRPA1或RyR可以预防这种情况.
结论:
- 氧化脂胆 (OxPCs) 通过激活TRPA1和RyR通道来调节气道狭窄,从而导致气道光滑肌中的细胞内和细胞外Ca2+的调动.
- 这些发现表明,喘患者的呼吸道中的OxPCs可能在呼吸道过敏反应中发挥重要作用.
- 向OxPC介导的Ca2+信号通路为喘管理提供了潜在的治疗策略.
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