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香烟烟雾通过ALOX15-Mediated Ferroptosis加剧压力过载引起的右心室功能障碍
Liang Zhou1, Qianwen Bai1, Raymond Shi1
1State Key Laboratory of Respiratory Diseases, National Clinical Research Center for Respiratory Diseases, Guangzhou Institute of Respiratory Health, Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
香烟烟雾会通过直接损害心脏细胞,使肺高血压中的右心力衰竭恶化. ALOX15-ferroptosis通路是驱动这种损伤的关键机制,可能是治疗点.
科学领域:
- 心血管生物学 心血管生物学
- 肺部医学 肺部医学
- 毒理学 毒理学 毒理学
背景情况:
- 慢性阻塞性肺病相关的肺高血压 (COPD-PH) 涉及右心室 (RV) 功能障碍.
- 在压力过载下RV故障中,香烟烟雾 (CS) 的直接作用尚未完全理解.
研究的目的:
- 在肺高血压的小鼠模型中研究CS对RV衰竭的直接心脏毒性影响.
- 阐明分子机制,特别是ALOX15-ferroptosis通路,参与CS诱导的RV功能障碍.
主要方法:
- 建立了肺动脉带带 (PAB) 的老鼠模型,随后暴露于CS.
- 通过心声学,血液动力学和组织病理学评估RV功能和重塑.
- 利用RNA测序和RV心肌细胞和纤维细胞暴露于香烟烟雾提取物 (CSE) 的体外研究.
主要成果:
- 在PAB大鼠中,CS暴露加剧了RV功能障碍,缩,纤维化和毛细血管稀缺.
- 转录组分析显示RV组织中ALOX15-ferroptosis通路的激活.
- 在体外,CSE在心肌细胞中放大了 ангиотензин II 诱导的 ALOX15 上调和心脏应激标志物 (ANP,BNP),这些标志物因Alox15 基因沉默或ML351 抑制而降低.
结论:
- 通过心脏毒性作用,CS直接加速RV压力过载中的故障.
- ALOX15-ferroptosis通路在CS诱导的RV功能障碍中发挥着关键的机制作用.
- 准ALOX15-ferroptosis通路为COPD-PH提供了一个潜在的治疗策略.
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