SOD2 in skeletal muscle: New insights from an inducible deletion model

Redox Biology

Brian G. Drew¹  Yanie Tan¹  Peter J. Meikle²  Yingying Liu²  Anna C. Calkin²  Christine Yang³  Judy B. de Haan³  Adrienne Laskowski³  Melinda T. Coughlan³  Shannen Walker³  Aowen Zhuang⁴  Simon T. Bond⁴  Arpeeta Sharma⁴  Tim Sikora⁴  Takahiko Shimizu⁴ 

[1] Baker Department of Cardiometabolic Health, University of Melbourne, Melbourne, Australia;Central Clinical School, Monash University, Melbourne, 3004, Australia;Diabetes Institute, Melbourne, 3004, Australia;;Baker Heart &

关键词: Skeletal muscle;    Superoxide;    ROS;    Lipid metabolism;    Mitochondria;   

DOI  :  

来源: DOAJ

【 摘 要 】

Metabolic conditions such as obesity, insulin resistance and glucose intolerance are frequently associated with impairments in skeletal muscle function and metabolism. This is often linked to dysregulation of homeostatic pathways including an increase in reactive oxygen species (ROS) and oxidative stress. One of the main sites of ROS production is the mitochondria, where the flux of substrates through the electron transport chain (ETC) can result in the generation of oxygen free radicals. Fortunately, several mechanisms exist to buffer bursts of intracellular ROS and peroxide production, including the enzymes Catalase, Glutathione Peroxidase and Superoxide Dismutase (SOD). Of the latter, there are two intracellular isoforms; SOD1 which is mostly cytoplasmic, and SOD2 which is found exclusively in the mitochondria. Developmental and chronic loss of these enzymes has been linked to disease in several studies, however the temporal effects of these disturbances remain largely unexplored. Here, we induced a post-developmental (8-week old mice) deletion of SOD2 in skeletal muscle (SOD2-iMKO) and demonstrate that 16 weeks of SOD2 deletion leads to no major impairment in whole body metabolism, despite these mice displaying alterations in aspects of mitochondrial abundance and voluntary ambulatory movement. This is likely partly explained by the suggestive data that a compensatory response may exist from other redox enzymes, including catalase and glutathione peroxidases. Nevertheless, we demonstrated that inducible SOD2 deletion impacts on specific aspects of muscle lipid metabolism, including the abundance of phospholipids and phosphatidic acid (PA), the latter being a key intermediate in several cellular signaling pathways. Thus, our findings suggest that post-developmental deletion of SOD2 induces a more subtle phenotype than previous embryonic models have shown, allowing us to highlight a previously unrecognized link between SOD2, mitochondrial function and bioactive lipid species including PA.

【 授权许可】

Unknown