老化中的NOX4驱动的线粒体氧化应激促进心肌重塑,并增加对心室动脉节律失常的易感性
Roberto Ramos Mondragon1, Shuyun Wang1, Mark D Stevenson2
1Department of Pharmacology, University of Michigan, 1150 West Medical Center Dr., 2301 Medical Science Research Building III, Ann Arbor, MI, 48109, USA.
Free radical biology & medicine
|May 4, 2025
概括
线粒体NADPH氧化酶4 (NOX4) 在心脏衰老中的过度表达增加了心室动脉节律失常 (VT) 的风险. 向NOX4可能会防止与年龄有关的心脏电气和结构变化,减少静脉动.
科学领域:
- 心脏病学 心脏病学
- 线粒体生物学 线粒体生物学
- 衰老研究研究 衰老研究
背景情况:
- 衰老与线粒体的氧化压力和心室动脉节律失常 (VT) 有关.
- 线粒体亲氧化系统对静脉瘤产生贡献的确切机制尚不清楚.
- 随着年龄的增长,NADPH氧化酶4 (NOX4) 的表达在心脏中增加,导致线粒体功能障碍和重塑.
研究的目的:
- 研究线粒体NOX4在与衰老相关的静脉瘤敏感性中的作用.
- 在NOX4过度表达的背景下识别VT的触发物和基质.
- 评估针对NOX4.4的治疗干预措施.
主要方法:
- 使用转基因小鼠与线粒体向的Nox4过度表达 (Nox4TG).
- 通过节拍,测量动作潜能持续时间 (APD) 和分析处理来评估静脉瘤发病率.
- 检查了心肌纤维化,炎症和基因表达.
- 测试了NOX1/NOX4抑制剂 (Setanaxib) 和线粒体催化酶 (mCAT) 的疗效.
主要成果:
- Nox4TG小鼠表现出更高的静脉瘤发病率,更短的APD,以及降低的Ca2+火花频率.
- 观察到的瑞诺丁受体2 (RyR2) 氧化和补偿性SERCA上调.
- 诺克斯4TG小鼠显示心室纤维化增加,炎症,TNF,TGF-β和MKI67.7.升高.
- 塞塔纳克西布治疗和mCAT联合表达减轻了静脉瘤,纤维化和炎症.
结论:
- 线粒体NOX4过度表达通过电气重塑和亲节律失调的结构变化促进静脉瘤.
- 与衰老相关的NOX4驱动的线粒体氧化应激增加了静脉瘤的风险.
- 向NOX4为与衰老相关的心脏病理学提供了潜在的治疗策略.
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