通过改变细胞内贩运而增加内源和外源CoQ的细胞积累
1Department of Biology, McGill University, Montreal, Quebec, Canada.
The Journal of biological chemistry
|November 6, 2025
概括
补充铁可以迅速提高细胞中的辅酶Q (CoQ) 水平,这表明还氧化机制参与其中. 这一发现可能导致管理细胞CoQ水平的新疗法.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 线粒体功能的功能
背景情况:
- 辅酶Q (CoQ) 对于细胞能量产生至关重要,并在线粒体中合成.
- 由于合成中断或未知的降解途径,细胞CoQ水平可能会下降.
- 已知低铁可用性可以通过抑制COQ7,一个关键的生物合成酶来降低CoQ水平.
研究的目的:
- 为了研究高细胞内铁对细胞辅酶Q (CoQ) 水平的影响.
- 探索基 iron 介导的 CoQ 恒温的变化背后的机制.
- 确定调节CoQ水平的潜在治疗策略.
主要方法:
- 用铁离子 (Fe2+) 补充小鼠巨细胞RAW264.7细胞.
- 评估细胞内CoQ水平和外源CoQ10的积累.
- 用N-乙半氨酸和活性氧物种 (ROS) 生成器帕拉奎特进行治疗.
- 分析COQ蛋白质的丰富性和对 lysosome 功能的研究.
主要成果:
- 补充铁可以迅速和可逆地增加细胞CoQ水平.
- 铁负荷增加了外源性CoQ10的吸收.
- N-乙半氨酸部分逆转了铁诱导的CoQ升高,表明了氧化还原机制.
- 帕拉克瓦特治疗也增加了CoQ水平,进一步支持了氧化还原介导作用.
- 没有观察到COQ蛋白水平的变化,这表明CoQ水平不是通过改变合成来调节的.
- 溶酶体功能调节影响了CoQ水平,指向降解/循环途径.
结论:
- 细胞内铁含量升高通过一种依赖于氧化还原的机制提高细胞中的辅酶Q (CoQ) 水平.
- 观察到的对CoQ水平的影响可能与降解和/或回收过程有关,而不是改变合成.
- 针对这些对铁和氧化还原敏感机制,为提高细胞CoQ水平提供了潜在的治疗途径.
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