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线粒体超级复杂组合调节了哺乳动物细胞中的代谢特征和谷氨酸依赖性

Kun Zhang^1,2, Linjie Chen^3,4, Bo Wang¹

¹Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, Department of Cell Biology and Medical Genetics, College of Laboratory Medicine and Life sciences, Wenzhou Medical University, Wenzhou 325035, China.

|June 23, 2023

概括

由COX7A2L调节的线粒体超复杂组合,影响细胞代谢,促进谷氨酸的使用和增殖. 这一发现对于了解细胞命运和胰腺癌至关重要.

科学领域:

线粒体生物学线粒体生物学
细胞代谢的细胞代谢.
生物化学生物化学

背景情况:

线粒体通过氧化酸化产生ATP,其中涉及线粒体内膜中的五个呼吸复合体.
线粒体超级复合体是这些呼吸系统复合体的更高层次组合.
COX7A2L是一种已知的超复杂组装因子,但其在细胞代谢中的作用尚不清楚.

研究的目的:

研究线粒体超级复合体对细胞代谢和增殖的影响.
阐明COX7A2L在调节线粒体功能和代谢途径中的作用.
探索线粒体超级复合体在胰腺管道腺癌 (PDAC) 中的重要性.

主要方法:

在人类和小鼠细胞和DBA/2J小鼠中减少COX7A2L,以创建缺乏线粒体超级复合体的模型.
在不同的营养条件下评估细胞增殖.
在COX7A2L枯竭细胞和小鼠中进行代谢分析 (有针对性和无针对性) 和代谢流量分析.
评估PDAC细胞系和裸体小鼠模型,以研究癌症中的线粒体超级复合体.

主要成果:

在COX7A2L枯竭的细胞中,线粒体超级复合体组合的损伤导致了代谢重编程到合成代谢,增加了谷氨酸代谢,增强了细胞增殖,并增强了抗氧化防御.
小鼠中Cox7a2l的淘汰促进了蛋白质/氨基酸作为氧化碳来源的利用.
在机械上,减少的超复杂组件增强了从复杂II到复杂III/IV的电子流,促进了复杂II依赖的呼吸,并上调了谷氨酸溶解和谷氨酸氧化.
在缺乏COX7A2L的细胞中,由于缺乏谷氨胺,PDAC细胞的增殖被显著抑制.

结论:

线粒体超级复合体,通过COX7A2L,在谷氨酸溶解中发挥调节作用.
这种调节会影响细胞代谢命运,特别是在不同的营养可用性下.
准线粒体超级复合体和谷氨酸代谢可能为PDAC提供治疗策略.

关键词:

在COX7A2L中使用.我们的PDAC是PDAC.在SCAF1中,SCAF1是SCAF1.代谢代谢代谢代谢这是线粒体超级复杂的超级复杂.

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