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在线粒体DNA维护障碍中对线粒体功能障碍的阶段性反应

Amy E Vincent¹, Chun Chen², Tiago Bernardino Gomes³

¹Wellcome Centre for Mitochondrial Research, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK; NIHR Biomedical Research Centre, Faculty of Medical Sciences, Newcastle University, Newcastle, UK; John Walton Muscular Dystrophy Research Centre, Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle, UK.

Biochimica et biophysica acta. Molecular basis of disease

|March 23, 2024

概括

骨肌中的线粒体DNA缺失会导致氧化酸化功能障碍. 细胞反应,包括蛋白质稳定和代谢调节,根据患者观察到的特定线粒体复合体缺陷而有所不同.

科学领域:

细胞生物学细胞生物学
线粒体生物学线粒体生物学
神经遗传学神经遗传学

背景情况:

线粒体DNA (mtDNA) 缺失导致骨肌肉中的克隆扩张,导致氧化酸化 (OXPHOS) 功能障碍.
这些缺失最初会影响周核线粒体,导致局部功能障碍,然后扩散到整个肌肉纤维.
假设线核信号传递在mtDNA缺失的积累和传播中至关重要.

研究的目的:

调查线核信号在肌肉纤维内的线粒体功能障碍传播中的作用.
在患有mtDNA维护障碍的患者中,对不同程度的OXPHOS功能障碍和破碎的红色纤维的细胞反应进行表征.

主要方法:

利用成像质量细胞计分析骨肌纤维中的蛋白质水平,来自mtDNA维护障碍患者.
量化水平的OXPHOS蛋白质和一个线粒体质量标记物.
评估了关键信号通路,蛋白质稳定和线粒体代谢的蛋白质标记物.

主要成果:

综合复合I和IV缺陷是最常见的OXPHOS缺陷.
在缺乏纤维中,剩余的OXPHOS复合体往往高调,超出了在破烂的红色纤维中观察到的线粒体质量的典型增加.
氧化酸化缺陷纤维显示出参与蛋白质稳定 (例如HSP60,LONP1) 和线粒体代谢调节 (例如PHB1) 的蛋白质的丰度增加.

结论:

细胞对线粒体功能障碍的反应是异质的,并且取决于缺少OXPHOS复合物的特定组合.
剩余的OXPHOS复合体的升级和蛋白质稳定/代谢途径的激活代表了对线粒体压力的适应性反应.
了解这些复杂的细胞反应是解读mtDNA维护障碍中的疾病机制的关键.

关键词:

细胞信号传输是如何进行的线粒体DNA的删除线粒体疾病线粒体疾病肌肉病症肌肉病症是指肌肉病症.奥克斯福斯 (OXPHOS) 是一个

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