线粒体功能障碍相关的膜上皮衰老与CdCl2诱导的COPD类肺损伤有关
Kun Peng1, Ya-Xin Yao1, Xue Lu2
1Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Anhui Medical University, Hefei, China.
Journal of hazardous materials
|July 7, 2024
概括
化暴露会通过诱导线粒体功能障碍和膜上皮质衰老而导致类似COPD的肺损伤. 缺少Sirt3会使伤害恶化,而NMN补充可以提供保护,这表明COPD的治疗潜力.
科学领域:
- 环境毒理学环境毒理学
- 肺部医学 肺部医学
- 细胞生物学 细胞生物学
背景情况:
- 对化 (CdCl2) 的呼吸道暴露与慢性阻塞性肺病 (COPD) 类肺损伤有关.
- 线粒体功能障碍和膜上皮衰老是CdCl2诱导的肺损伤的潜在机制.
研究的目的:
- 调查线粒体功能障碍介导的膜上皮衰老在CdCl2诱导的COPD类肺损伤中的作用.
- 探索Sirt3和NMN (尼古丁胺胺氨基二核酸前体) 在减轻CdCl2毒性的治疗潜力.
主要方法:
- 成年C57BL/6小鼠被暴露在CdCl2气溶中六个月.
- 在体外和体内实验中评估了衰老标志物 (p21,p16,β-galactosidase),DNA损伤 (γ-H2AX),cGAS-STING通路激活,与衰老相关的分泌表型 (SASP),线粒体功能 (SIRT3) 和肺功能.
- 研究包括Sirt3过度表达,Sirt3基因淘汰以及NMN补充.
主要成果:
- 暴露于CdCl2会增加衰老标志物,激活cGAS-STING通路,上调SASP因子,减少SIRT3和线粒体功能受损.
- 过度表达Sirt3减弱了CdCl2诱导的衰老和SASP,而Sirt3敲击则加剧了肺损伤和炎症.
- 补充NMN缓解了CdCl2诱导的衰老,SASP,膜损伤,上皮-介质细胞过渡和肺功能下降.
结论:
- 与线粒体功能障碍相关的膜上皮衰老是CdCl2诱导的COPD类肺损伤的关键机制.
- Sirt3对CdCl2的毒性起着保护作用,而NMN补充显示了预防或治疗这种肺损伤的治疗潜力.
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