在光滑肌中RSAD2-YTHDF1轴的激活会通过细胞间线粒体转移引起炎症性肠病
Wen-Di Zhang1,2,3, Dan-Dan Zhang1,2,3, Xu Wang4
1Department of Biochemistry and Molecular Biology, College of Basic Medicine, Hebei Medical University, Shijiazhuang, China.
Nature communications
|December 14, 2025
概括
缺少SM22α的光滑肌细胞会因RSAD2-介导的线粒体功能障碍和铁亡引起的大肠炎. 向RSAD2-YTHDF1通路可能为性结肠炎 (UC) 提供一种新的治疗策略.
科学领域:
- 胃肠病学 胃肠病学
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 结肠平滑肌细胞 (CSMC) 的变化与性结肠炎 (UC) 有关.
- 平滑肌肉 (SM) 22α 缺乏可以改变平滑肌肉 (SMC) 细胞表型.
- 线粒体功能障碍和铁亡是炎症性肠病的新兴因素.
研究的目的:
- 调查SM22α缺乏在自发性结肠炎发展中的作用.
- 阐明将CSMC功能障碍与大肠炎联系起来的分子机制,重点关注线粒体通路.
- 探索针对UC中的RSAD2-YTHDF1轴的治疗潜力.
主要方法:
- 利用Sm22α缺乏的小鼠来建模自发性结肠炎.
- 研究了在CSMC线粒体功能障碍中激进的S-adenosyl-methionine域含有2 (RSAD2) 的作用.
- 分析了N6-甲基氨酸 (m6A) 修饰,YTHDF1和胺相关蛋白1 (DRP1) 的相互作用.
- 评估了线粒体细胞外囊泡对肠道上皮细胞的影响.
- 在人类UC样本中检查了RSAD2表达和铁亡标记物.
主要成果:
- 缺乏Sm22α的小鼠自发发育大肠炎,其特征是CSMC线粒体功能障碍和炎症.
- RSAD2促进了YTHDF1甲基化和DRP1翻译,导致CSMC线粒体的分裂.
- 炎症性CSMC衍生的细胞外囊泡通过ROS生产诱导结肠上皮细胞中的铁亡.
- 在Sm22α缺乏的小鼠中,RSAD2的切除改善了结肠炎.
- 在UC患者样本中观察到升高的RSAD2和铁灭特征.
结论:
- 由RSAD2介导的线粒体变化驱动的功能失调的结肠平滑肌细胞,有助于结肠炎的发病.
- RSAD2-YTHDF1-DRP1轴代表了CSMC功能障碍和大肠炎中的关键途径.
- 准RSAD2和YTHDF1为性结肠炎提供了一个有前途的治疗途径.
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