线粒体酸感应离子通道1a缺乏导致肺动脉平滑肌细胞中的线粒体功能障碍
Megan N Tuineau1, Lindsay M Herbert1, Heaven E Medina1
1Department of Cell Biology and Physiology, University of New Mexico School of Medicine, Albuquerque, NM, United States.
American journal of physiology. Lung cellular and molecular physiology
|February 25, 2026
概括
肺动脉平滑肌细胞中线粒体ASIC1a的损失通过损害线粒体功能和促进亡抵抗,有助于肺高血压. 恢复mtASIC1a可以扭转这些影响.
科学领域:
- 心血管生物学 心血管生物学
- 细胞生理学 细胞生理学
- 线粒体生物学 线粒体生物学
背景情况:
- 肺高血压 (PH) 涉及肺动脉重塑,其特点是肺动脉光滑肌细胞 (PASMC) 的高增殖和亡抵抗.
- 酸感应离子通道1a (ASIC1a) 对于慢性缺氧 (CH) 诱导的PH至关重要,其激活与PASMC中的血再分配有关.
- 已知线粒体ASIC1a (mtASIC1a) 能够影响神经元的亡,但其在血管细胞,特别是PASMC中的作用尚未被探索.
研究的目的:
- 调查mtASIC1a在PASMC线粒体平衡和CH诱导PH期间的亡中的作用.
- 确定mtASIC1a损失是否有助于线粒体功能障碍和PH中的亡抵抗.
主要方法:
- 评估了PASMC和控制和CH大鼠的肺动脉中的mtASIC1a定位.
- 从CH大鼠和Asic1a小鼠的PASMC中评估了线粒体膜潜力 (ΔΨm),线粒体Ca2 +,超氧化物水平,线粒体和亡标记物 (切割的caspase-3).
- 利用传输电子显微镜分析线粒体形态.
- 使用lentiviral向量恢复了mtASIC1a的表达.
主要成果:
- 在PASMC和肺动脉中,CH导致mtASIC1a局部降低.
- 来自CH大鼠和Asic1a淘汰赛小鼠的PASMCs显示了ΔΨm超极化,线粒体Ca2+和超氧化物增加,线粒体细胞衰变受损,并减少了分裂的caspase-3.
- 线粒体表现出形态变化,包括尺寸增加和缩小的尺寸比.
- 透视恢复mtASIC1a正常化的ΔΨm和恢复的caspase-3裂变.
结论:
- mtASIC1a是PASMCs中线粒体功能的新型调节剂.
- 在CH中失去mtASIC1a促进了PASMC线粒体功能障碍,其特征是ΔΨm超极化和线粒细胞衰变受损.
- mtASIC1a缺乏导致PASMCs中细胞灭亡抵抗,这是PH病变的关键特征.
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