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SIRT3 Mediates Multi-Tissue Coupling for Metabolic Fuel Switching

机译:SIRT3介导用于代谢燃料转换的多组织耦合

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摘要

SIRT3 is a member of the Sirtuin family of NAD(+)-dependent deacylases and plays a critical role in metabolic regulation. Organism-wide SIRT3 loss manifests in metabolic alterations; however, the coordinating role of SIRT3 among metabolically distinct tissues is unknown. Using multi-tissue quantitative proteomics comparing fasted wild-type mice to mice lacking SIRT3, innovative bioinformatic analysis, and biochemical validation, we provide a comprehensive view of mitochondrial acetylation and SIRT3 function. We find SIRT3 regulates the acetyl-proteome in core mitochondrial processes common to brain, heart, kidney, liver, and skeletal muscle, but differentially regulates metabolic pathways in fuel-producing and fuel-utilizing tissues. We propose an additional maintenance function for SIRT3 in liver and kidney where SIRT3 expression is elevated to reduce the acetate load on mitochondrial proteins. We provide evidence that SIRT3 impacts ketone body utilization in the brain and reveal a pivotal role for SIRT3 in the coordination between tissues required for metabolic homeostasis.
机译:SIRT3是NAD(+)依赖性脱酰基酶Sirtuin家族的成员,在代谢调节中起关键作用。整个生物体中SIRT3的损失表现为代谢改变。但是,SIRT3在新陈代谢不同的组织之间的协调作用尚不清楚。使用多组织定量蛋白质组学比较禁食的野生型小鼠与缺乏SIRT3的小鼠,创新的生物信息学分析和生化验证,我们提供了线粒体乙酰化和SIRT3功能的全面视图。我们发现SIRT3调节大脑,心脏,肾脏,肝脏和骨骼肌常见的核心线粒体过程中的乙酰基蛋白质组,但是在燃料生产和燃料利用组织中差异地调节代谢途径。我们提出了SIRT3在肝脏和肾脏中的一种额外的维护功能,其中SIRT3的表达升高以减少线粒体蛋白上的乙酸盐负荷。我们提供的证据表明,SIRT3影响大脑中酮体的利用,并揭示了SIRT3在代谢稳态所需的组织之间的协调中的关键作用。

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