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线粒体综合应激反应控制肺上皮细胞命运
SeungHye Han1, Minho Lee2, Youngjin Shin2
1Division of Pulmonary and Critical Care Medicine, Department of Medicine, Northwestern University, Chicago, IL, USA. shan@northwestern.edu.
Nature
|August 9, 2023
概括
线粒体综合体I对肺部发育至关重要,通过再生NAD+,防止细胞死亡和综合应激反应. 恢复NAD+或抑制ISR可以部分挽救肺上皮细胞的缺陷.
科学领域:
- 细胞生物学
- 发育生物学
- 代谢调节
背景情况:
- 膜上皮类型1 (AT1) 和类型2 (AT2) 细胞对于肺功能和修复至关重要.
- 肺上皮细胞命运的代谢调节在很大程度上仍未被探索.
- 在肺部发育和修复过程中,AT2细胞充当AT1细胞的干细胞.
研究的目的:
- 调查线粒体代谢在产后发育过程中的肺上皮细胞命运中的作用.
- 确定调节细胞分化和存活的特定线粒体组成部分.
- 了解将代谢功能障碍与肺部发育缺陷联系在一起的机制.
主要方法:
- 在肺上皮细胞中针对性删除线粒体电子运输链子单元 (Ndufs2,Sdhd) 的小鼠模型.
- 使用单细胞RNA测序来分析受影响细胞中的基因表达变化.
- 使用的干预措施包括酵母NADH脱酶 (NDI1) 表达,ISR抑制剂和NAD+前体.
主要成果:
- 肺上皮细胞中Ndufs2的丧失导致了膜发育的致命缺陷,其特征是过渡性细胞的缩.
- 条件表达NDI1挽救了气泡发育和致死性,表明NAD+再生的重要性.
- 过渡细胞显示了综合应激反应 (ISR) 基因的丰富;ISR抑制或NAD+前体的使用部分挽救了致死性.
结论:
- 线粒体复合体I-依赖的NAD+再生对于指导细胞命运在产后气泡发育过程中至关重要.
- 综合应激反应的病理诱导是复杂I功能障碍导致的发育缺陷的关键机制.
- 针对NAD+代谢和ISR途径为肺发育障碍提供了潜在的治疗策略.
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