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NGF增加了肺动脉光滑肌细胞中的Connexin-43表达和功能,以诱导肺动脉高反应性
Guillaume Cardouat1, Matthieu Douard2, Clément Bouchet1
1Univ. Bordeaux, INSERM, CRCTB, U 1045, Bordeaux F-33000, France.
概括
神经生长因子 (NGF) 控制肺动脉中的Connexin-43 (Cx43),导致肺高血压. 阻断NGF或其受体会降低Cx43并防止肺部高血压.
科学领域:
- 心血管研究研究心血管研究
- 肺部医学 肺部医学
- 细胞生物学 细胞生物学
背景情况:
- 肺高血压 (PH) 涉及肺动脉压升高,导致右心室衰竭.
- 神经生长因子 (NGF) 在PH病变发生过程中起着已知的关键作用.
- 连xin-43 (Cx43) 是血管光滑肌肉间隙连接的关键组成部分.
研究的目的:
- 调查NGF是否控制肺动脉光滑肌中的Cx43表达和功能.
- 要确定这种NGF-Cx43机制是否有助于NGF诱导的肺动脉过敏反应.
主要方法:
- 利用人类肺动脉光滑肌细胞和慢性缺氧诱导的PH的老鼠模型.
- 采用了体外药理学和体内siRNA方法.
- 评估了Cx43表达,酸化和局部化.
- 使用染料转移和FRAP测定测量了GAP连接活性.
- 评估NGF/TrkA阻断对肺动脉压和右心缩的影响.
主要成果:
- 通过其TrkA受体,NGF增加了人肺动脉光滑肌细胞中的Cx43表达,酸化和血膜定位.
- 这增强了Cx43依赖的GAP结活动.
- 在老鼠肺循环中NGF诱导的Cx43表达和活性增加导致肺动脉过敏反应.
- 在大鼠PH模型中,阻断NGF或TrkA降低了缺氧诱导的Cx43上调,并防止了肺动脉压升高和右心缩.
结论:
- 肺动脉光滑肌细胞中Cx43的NGF调节有助于改变肺动脉反应性.
- NGF和TrkA受体在低氧诱导PH的Cx43表达增加中发挥作用.
- 这些NGF/Cx43依赖的机制在人类PH病理生理学中具有重要意义.
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