在败血症中发生的Enterococcus faecalis转位:纤维解和线粒体功能障碍驱动肺损伤
Chenfei Wang1, Dan Lv1, Yuan Gao2
1Department of Emergency, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
Journal of cellular and molecular medicine
|November 11, 2025
概括
来自肠道的Enterococcus faecalis通过激活纤维解和损害线粒体,使败血症引起的急性肺损伤 (ALI) 恶化. 抑制纤维解质或保护线粒体可以减少肺损伤,而组合疗法显示出最好的结果.
科学领域:
- 微生物学和免疫学
- 败血症的病理生理学
- 线粒体生物学 线粒体生物学
背景情况:
- 败血症往往导致急性肺损伤 (ALI),其特点是炎症和线粒体功能障碍.
- 在败血症期间,肠道细菌可以转移到肺部,导致损伤.
- 主体纤维溶解系统在败血症引起的ALI中的作用尚未完全理解.
研究的目的:
- 调查Enterococcus faecalis在败血症诱导的ALI中的作用.
- 阐明E. faecalis会加剧肺损伤的机制,重点关注纤维溶解系统和线粒体功能.
- 评估向纤维素分解和线粒体功能障碍的治疗潜力.
主要方法:
- 使用了一种结孔 (CLP) 鼠标模型与E. faecalis肺部感染相结合.
- 评估了纤维溶解活性,纤维素降解产物 (FDP) 和紧密连接蛋白 (ZO-1,ocludin) 的表达.
- 评估线粒体功能 (超结构,ATP合成,ROS水平) 和肺组织学.
- 测试了氨基酸 (纤维分解抑制剂) 和MitoTEMPO (线粒体保护剂) 作为单一疗法和组合疗法的疗效.
主要成果:
- E. faecalis通过激活宿主纤维解质系统,增加等离子体活性和FDP水平来加剧ALI.
- 肠道屏障完整性受到损害,这是ZO-1和奥克卢丁表达减少所表明的.
- 观察到线粒体功能障碍,包括超结构性损伤,ATP合成受损和ROS增加.
- 氨基酸和MitoTEMPO治疗减弱了纤维素分解,保留了线粒体功能,并减少了肺损伤.
- 组合疗法显示出最显著的保护作用,改善肺组织学和减少炎症标志物.
结论:
- Enterococcus faecalis利用宿主纤维溶解系统进行肺部转位,导致线粒体损伤并加剧败血症引起的ALI.
- 向纤维解质系统和线粒体功能障碍代表了毒引起的ALI的有前途的治疗策略.
- 组合疗法提供了对败血症引起的肺损伤的优越保护.
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