通过KAT8介导的MDH2乳化,通过增强线粒体功能和抗压力来促进癌的进展
Yuangui Tang1, Chenyun Dai2, Huihui Yang1
1Beijing Key Laboratory of Cancer Invasion and Metastasis Research, Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China.
线粒体蛋白质的乳糖化,特别是酸脱酶2 (MDH2) 的乳糖化,通过增强能量产生和减少氧化应激,推动细胞癌 (RCC) 的进展. 针对这个过程为RCC提供了一个新的治疗策略.
科学领域:
- 生物化学 生物化学
- 在瘤学瘤学.
- 线粒体生物学 线粒体生物学
背景情况:
- 非海斯顿蛋白质的乳糖化促进了瘤的进展.
- 线粒体蛋白质乳化在癌症,特别是细胞癌 (RCC) 中的作用在很大程度上是未知的.
研究的目的:
- 为了研究RCC中的线粒体蛋白质乳糖化.
- 为了确定特定的乳酸化线粒体蛋白质,并阐明它们在RCC进展中的功能作用.
主要方法:
- 乳腺瘤剖析用于识别人类RCC细胞中的乳酸化线粒体蛋白质.
- 在K239.9处对马拉酸脱酶2 (MDH2) 的乳酸定位分析.
- 研究MDH2乳化 (KAT8,SIRT3) 的调节机制.
- 评估MDH2 K239乳化 (MDH2K239la) 对细胞代谢,氧化应激和RCC恶性瘤的功能影响.
主要成果:
- 在RCC细胞中确定了多个乳酸化线粒体蛋白质,MDH2是三碳酸 (TCA) 循环中唯一的乳酸化蛋白质.
- 发现MDH2 K239乳化 (MDH2K239la) 可以提高NADH/NAD+的比例以产生ATP,并促进NADPH生成以减少活性氧物种 (ROS).
- MDH2K239la增强了MDH2的酶活性及其与SLC25A1的相互作用,促进了依赖IDH1的NADPH生产的酸盐排放.
- MDH2K239la通过赋予氧化应激抵抗和维持线粒体功能来促进RCC恶性病变.
结论:
- 线粒体蛋白质的乳化,以MDH2K239la为例,是一种重新编程线粒体代谢以驱动RCC进展的新机制.
- MDH2K239la 赋予抗氧化压力的能力,并增强能量生产,有助于RCC恶性病变.
- 向线粒体蛋白质乳糖化,如MDH2K239la,为细胞癌提供了潜在的治疗策略.
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