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过度的核酸R环诱导线粒体依赖的上皮细胞亡,并驱动自发性肠道炎症
Xu Yang1,2,3, Guilin Li1,2, Pengbo Lou4
1Tianjian Laboratory of Advanced Biomedical Sciences, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan 450052, China.
概括
氧化应激通过破坏TDP-43引发炎症性肠病 (IBD),导致细胞死亡. 恢复NAD+水平或抑制ALKBH7为IBD提供了一个潜在的治疗策略.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 胃肠病学 胃肠病学
背景情况:
- 氧化应激是炎症性肠病 (IBD) 发病的一个关键因素.
- 将氧化压力与IBD发病联系在一起的确切机制尚未完全理解.
- 在IBD中观察到TDP-43功能障碍,但其作用仍然不清楚.
研究的目的:
- 阐明TDP-43在氧化应激诱导的IBD中的作用.
- 研究TDP-43中断导致肠道炎症的分子机制.
- 根据TDP-43功能来确定IBD的潜在治疗点.
主要方法:
- 分析IBD患者的炎症组织,以评估氧化应激和TDP-43水平.
- 在小鼠肠表皮质中诱导性删除Tardbp外子,以研究TDP-43的功能.
- 研究亡途径,R循环积累,DNA损伤和NAD+代谢.
- 药理干预包括NAD+补充和ALKBH7抑制在小鼠模型中.
- 在临床IBD样本中对TDP-43,γ-H2A.X和p-MLKL的相关性分析.
主要成果:
- 氧化应激激活了TDP-43的细胞核转移,并降低了IBD组织中的水平.
- 在小鼠肠道中TDP-43的破坏会通过亡诱导自发性炎症.
- 丢失TDP-43导致R循环积累,DNA损伤,PARP1过度活化和NAD+枯竭,从而引发亡.
- 补充NAD+或ALKBH7抑制可以挽救TDP-43缺乏引起的细胞死亡和炎症.
- 临床IBD样本显示TDP-43水平与DNA损伤和亡标记之间的反相关性.
结论:
- 氧化应激诱导的TDP-43功能障碍是IBD肠道炎症的关键驱动因素.
- 该机制涉及R循环积累,DNA损伤,NAD+枯竭和线粒体依赖性亡.
- 恢复NAD+水平或抑制ALKBH7为IBD提供了一个有希望的治疗途径.
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