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特定环境的血管原蛋白介导的tRNA片段 (tDRs) 的生物发生塑造了线粒体的应激反应
Shadi Al-Mesitef1, Daisuke Ando2, Tomoya Saigasaki1
1Department of Neurosurgical Engineering, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan; Department of Translational Neuroscience, Tohoku University Graduate School of Medicine, Sendai, Japan.
Redox biology
|January 28, 2026
概括
转移RNA衍生的小RNA (tDRs) 是细胞应激的关键. 血管新生素 (ANG) 指导tDR的产生,这对于响应线粒体功能障碍和压力至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 转移RNA衍生小RNA (tDRs) 越来越多地被认为是它们在细胞应激反应中的作用.
- 然而,它们在线粒体功能障碍期间的生物发生和功能尚未得到充分理解.
研究的目的:
- 研究tDRs在对线粒体压力的反应中的产生和作用.
- 阐明血管新生素 (ANG) 在tDR生物发生和细胞应激弹性中的参与.
主要方法:
- 使用tDR-seq在HEK293T细胞中在各种线粒体压力因素 (轮,TTFA,抗菌素A,KCN,寡菌素,酸盐) 下对tDRs的分析.
- 评估TDR产生和应激反应的细胞与改变的ANG水平 (淘汰赛,过度表达) 和与重组ANG.
- 对tDR动机的分析和对YBX1在线粒体应激反应中的作用的调查.
主要成果:
- 确定了压力特定的tDR剧目,不同的压力因素具有不同的模式 (例如,rotenone/antimycin A的i-tRF和tRF3,arsenite的tiRNA).
- ANG 删除损害了压力诱导的tDR生物发生和对线粒体压力因素的敏感性增加,而 ANG 过度表达提供了保护.
- 合成tDR模仿剂没有挽救细胞活力,这表明本地修改或tDR池的重要性.
- 在抗菌素诱导的tDR中发现了YBX1结合部位,YBX1扰动模仿了增强的线粒体应激抵抗.
结论:
- 由ANG指导的特定环境tDR生物发生是线粒体应激反应的关键组成部分.
- 在线粒体应激条件下,tDRs在细胞适应和生存中发挥着重要作用.
- ANG和潜在的YBX1是这种tDR介导的应激反应途径的关键调节者.
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