在MASH进展过程中,肝脏线粒体亚群的功能细分
Noble Kumar Talari1, Ushodaya Mattam1, Afra P Rahman2
1Department of Pharmacology, Physiology, and Neurobiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
Communications biology
|February 18, 2025
概括
肝脏中的线粒体在代谢功能障碍相关的脂肪肝炎 (MASH) 中发挥着独特的作用. 周围的线粒体在能量生产中更活跃,而细胞质线粒体在MASH进展过程中处理脂肪酸氧化.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 线粒体生物学 线粒体生物学
- 代谢疾病 代谢疾病
背景情况:
- 在肝脏疾病中,特别是代谢功能障碍相关的脂肪肝炎 (MASH) 中,周周细胞线粒体 (PDM) 的功能尚不清楚.
- 代谢功能障碍相关的肥胖性肝病 (MASLD) 可以发展为MASH,这是一个由炎症和肝损伤特征的疾病.
研究的目的:
- 研究肝细胞质线粒体 (CM) 和PDM在MASLD向MASH的进展中的不同作用和功能.
- 在健康和患有肝病的肝脏状态下,描述CM和PDM之间的生物能量和结构差异.
主要方法:
- 从饮食诱导的MASLD/MASH和对照小鼠的小鼠模型中分离肝脏CM和PDM.
- 蛋白质组学分析以确定线粒体种群之间的组成和功能差异.
- 评估线粒体呼吸,氧化酸化 (OXPHOS) 蛋白水平,TCA循环流量和脂肪酸氧化能力.
- 传输电子显微镜 (TEM) 用于评估线粒体形态和动力学 (MFN2和DRP1蛋白水平).
主要成果:
- 在从健康肝脏向脂肪和先进的MASH的进展过程中,观察到肝脏CM和PDM水平之间的反向关系.
- 与CM相比,PDM表现出更高的生物能活性,酸盐氧化能力和OXPHOS蛋白水平.
- 随着MASH的进展,CM表现出脂肪酸氧化能力的增加.
- 线粒体形态从健康/早期肥胖症中较大和较长的变化到晚期MASH中较小和碎片化的变化,与MFN2 (PDM) 和DRP1 (CM) 水平相关.
结论:
- 肝脏PDM和CM在组成和功能上是不同的线粒体群.
- PDM主要通过pyruvate氧化和OXPHOS参与能量生产,而CM更多地参与脂肪酸氧化,特别是在MASH进展期间.
- CM和PDM的不同作用突出显示了它们在MASLD和MASH的发病过程中的不同参与.
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