USP2 通过 UCP2 表达在髓母细胞中缓解反应性氧物种诱导的线粒体损伤
Hiroshi Kitamura1, Masaki Fujimoto1, Mayuko Hashimoto2
1Laboratory of Disease Models, School of Veterinary Medicine, Rakuno Gakuen University, Ebestsu 069-8501, Japan.
International journal of molecular sciences
|November 27, 2024
概括
乌比基特异性蛋白酶2 (USP2) 通过维持PGC1α-UCP2轴来保护线粒体,防止反应性氧物种 (ROS) 在肌细胞中积累. 这项研究阐明了USP2.
科学领域:
- 线粒体生物学 线粒体生物学
- 细胞代谢的细胞代谢.
- 酶学 是一种酶学.
背景情况:
- 线粒体完整性对于细胞功能至关重要.
- 乌比基特异蛋白酶2 (USP2) 在维护线粒体健康方面发挥作用.
- 对于USP2对线粒体的保护作用的确切机制尚未完全理解.
研究的目的:
- 调查USP2通过哪些分子机制来维护神经细胞中的线粒体完整性.
- 确定USP2在调节线粒体活性氧物种 (ROS) 和膜潜力的作用.
- 为了阐明USP2,PGC1α和UCP2在肌肉发育中的关系.
主要方法:
- 使用C2C12髓母细胞细胞培养.
- 使用基因淘汰 (KO) 和化学抑制USP2.
- 评估了线粒体ROS水平,膜潜力,ATP水平以及UCP2和PGC1α的蛋白质/mRNA表达.
- 进行过度表达研究以确认蛋白质稳定机制.
主要成果:
- USP2 缺乏导致线粒体 ROS 增加和C2C12 核细胞中的膜潜能降低.
- 在USP2缺乏的细胞中,ROS清理部分恢复的线粒体功能.
- 抑制USP2降低了解蛋白2 (UCP2) 的mRNA和蛋白质水平.
- 过度表达UCP2在USP2缺乏细胞中挽救了线粒体膜潜力和ATP水平.
- USP2 缺乏症降低了氧酶增殖器激活受体 γ 协同激活剂 1α (PGC1α) 蛋白质水平,同时提高了其mRNA的调节.
- 发现USP2以依赖异酶的方式稳定PGC1α.
结论:
- USP2对于维护肌细胞中的线粒体完整性至关重要.
- 通过保护PGC1α-UCP2信号轴,USP2保护线粒体ROS积累.
- USP2可能会稳定PGC1α蛋白,这反过来会诱导UCP2,从而减轻线粒体功能障碍.
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