PC-ME1代谢轴的补偿活性是对线粒体复合物I抑制的差异敏感性的基础
Lucia Del Prado1, Myriam Jaraíz-Rodríguez1, Mauro Agro1
1Departamento de Biología Molecular and Centro de Biología Molecular Severo Ochoa (UAM-CSIC), Madrid, Spain.
Nature communications
|October 7, 2024
概括
电子输送链 (ETC) 的抑制导致线粒体疾病. 一个非正规的TCA循环维持NADPH,而不是ATP,其介质解释了差异性的细胞敏感性,影响疾病管理.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
背景情况:
- 电子输送链 (ETC) 的缺陷导致线粒体疾病.
- 细胞和组织对ETC干扰的敏感性各不相同,其潜在机制尚不清楚.
研究的目的:
- 研究不同细胞对ETC抑制的敏感性背后的分子机制.
- 确定关键的代谢途径和参与细胞对ETC干扰反应的分子.
主要方法:
- 使用非正规的三碳酸 (TCA) 循环来维持在ETC抑制时的酸盐水平和NADPH生产.
- 评估了Pyruvate carboxylase (PC) 和ME1在代谢重编程中的作用.
- 研究了PC和ME1在星体细胞与神经元中的选择性表达模式.
- 在临床前小鼠模型中评估了增加ME1水平的治疗潜力,该模型具有复杂I (CI) 缺乏.
主要成果:
- 在ETC抑制上调调节非正规的TCA循环,保持NADPH水平,而不是ATP.
- 减少NADPH,而不是ATP耗尽,是复合I (CI) 抑制的主要不良影响.
- 酸盐炭酸酶 (PC) 和ME1在星球细胞中被选择性地表达,这解释了对ETC抑制的差异性敏感性.
- 在CI缺陷小鼠模型中,增加大脑中的ME1减轻了神经炎症和改善了运动功能.
结论:
- 细胞对ETC抑制的敏感性是通过涉及非正规TCA循环和PC和ME1.1差异表达的代谢重编程来确定的.
- 产生NADPH对于减轻ETC抑制的不良影响至关重要,特别是在星球细胞中.
- 针对ME1为影响大脑的线粒体疾病提供了潜在的治疗策略.
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