通过filopodia衍生的小细胞外囊泡进行氧化应激反应的胺介导编排
Zainuddin Quadri1, Ahmed Elsherbini1, Simone M Crivelli1
1Department of Physiology, University of Kentucky College of Medicine, Lexington, Kentucky, USA.
Journal of extracellular vesicles
|July 11, 2024
概括
氧化应激触发了filopodia的形成和胺丰富的细胞外囊泡 (EV) 的释放. 这些小EV (sEV) 携带的酶通过向线粒体诱导细胞死亡.
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:
- 细胞外囊泡 (EVs) 从血中脱落,但它们的调节和功能尚未完全理解.
- 氧化应激涉及各种细胞过程,但其在EV生物发生和功能中的特定作用需要进一步调查.
研究的目的:
- 研究氧化应激在细胞外囊泡的形成和功能中的作用.
- 阐明氧化应激诱导的EV脱落背后的分子机制及其对细胞过程的影响.
主要方法:
- 使用了Hela细胞和氧化应激诱导与H2O2.2.
- 采用了filopodia形成分析,EV特征 (大小,CD44标签) 和脂分析 (胺,nSMase2,ASM).
- 开发了一种使用NBD-胺的EVs的新型代谢标记技术,并评估了线粒体的EV向和N2a细胞中细胞死亡的诱导.
主要成果:
- 氧化应激刺激了filopodia的形成和小EVs (sEVs) 的分泌,这些EVs被胺丰富.
- 在filopodia中局部化的nSMase2和ASM酶对于陶胺生成和sEV脱落至关重要;nSMase2也介导了filopodia的形成.
- 被标记的sEV将胺转移到线粒体,诱导神经元细胞中的细胞死亡.
结论:
- 氧化应激诱导了filopodia中的nSMase2和ASM的相互作用,导致富含胺的sEVs的脱落.
- 这些sEV可以将胺转移到线粒体,传播细胞死亡.
- 这项研究揭示了一种由氧化应激诱导的细胞外囊泡介导的细胞死亡信号的新机制.
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