肺静脉毛细血管的线粒体在肺炎中介于肺肝交谈
Memet T Emin1, Michael J Lee2, Jahar Bhattacharya3
1Department of Pediatrics, Pediatric Critical Care and Hospital Medicine, Columbia University Irving Medical Center, New York, New York, United States.
概括
肺毛细血管中的线粒体解蛋白2 (UCP2) 在肺炎期间导致肺损伤和肝脏拥堵. 抑制UCP2可能为急性呼吸困扰综合征 (ARDS) 提供治疗策略.
科学领域:
- 肺部医学 肺部医学
- 线粒体生物学 线粒体生物学
- 关键的护理关键的护理
背景情况:
- 急性呼吸困扰综合征 (ARDS) 涉及肺内皮屏障衰竭和高死亡率,通常与多个器官功能障碍有关.
- 将肺损伤与器官衰竭联系在一起的机制,特别是肝脏拥堵,仍然不太清楚.
- 线粒体解蛋白2 (UCP2) 是线粒体功能的关键调节者.
研究的目的:
- 调查线粒体解蛋白2 (UCP2) 在肺屏障衰竭和随后的器官交叉通话中的作用.
- 在肺炎模型中阐明肺损伤导致肝脏拥堵的机制.
- 评估针对肺损伤和ARDS的UCP2的治疗潜力.
主要方法:
- 在小鼠体内注入脂多糖 (LPS) 或Pseudomonas aeruginosa以诱导肺损伤.
- 实时共聚焦成像孤立的,透血液的小鼠肺部,可视化内皮屏障功能和线粒体活动.
- 使用了基因操纵 (UCP2的血管淘汰) 和药理干预 (catalase转染,中性粒细胞枯竭).
主要成果:
- LPS灌注导致了肺静脉毛细血管中的反应性氧物种转移和线粒体脱极化,这表明屏障功能障碍.
- 抑制UCP2或catalase可以防止线粒体脱极化,并显著减少肺损伤 (BAL蛋白,血管外肺水).
- 由LPS或P. aeruginosa诱导的肺损伤导致肝脏拥堵,由肝血红蛋白和AST水平的增加证明;UCP2抑制阻止了这一点,而中性粒细胞枯竭阻止了肝脏反应,但没有肺损伤.
结论:
- 氧化剂诱导的UCP2在肺静脉毛细血管中的表达启动了导致中性粒细胞激活,肝脏拥堵和肺炎死亡的级联.
- 肺毛细血管中的线粒体脱极化是一个关键的上游事件,它调解了肺肝交叉对话.
- 针对血管UCP2是一个有希望的治疗策略,用于减轻ARDS中的肺损伤和相关的多器官衰竭.
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