Eshima 2020 J Appl Physiol (1985)
|Eshima H, Siripoksup P, Mahmassani ZS, Johnson JM, Ferrara PJ, Verkerke ARP, Salcedo A, Drummond MJ, Funai K (2020) Neutralizing mitochondrial ROS does not rescue muscle atrophy induced by hindlimb unloading in female mice. J Appl Physiol (1985) [Epub ahead of print].|
Abstract: Excess reactive oxygen species (ROS) induced by physical inactivity is associated with muscle atrophy and muscle weakness. However, the role of mitochondrial ROS on disuse-induced muscle atrophy is not fully understood. The purpose of this study was to utilize a genetic strategy to examine the effect of neutralizing mitochondrial ROS on disuse-induced skeletal muscle atrophy. This was accomplished by placing wildtype (WT) and mitochondrial-targeted catalase expressing (MCAT) littermate mice on 7-days of hindlimb unloading. After assessment of body weight and composition, muscles were analyzed for individual muscle mass, force generating capacity, fiber-type, cross-sectional area, and mitochondrial phenotyping including H2O2 production. Despite a successful attenuation of mitochondrial ROS, MCAT mice were not protected from muscle atrophy. No differences were observed in body composition, lean mass, individual muscle masses, force-generating capacity, and muscle fiber cross-sectional area. These data suggest that neutralizing mitochondrial ROS is insufficient to suppress disuse-induced loss of skeletal muscle mass and contractile function.
Labels: MiParea: Respiration
Stress:Oxidative stress;RONS Organism: Mouse Tissue;cell: Skeletal muscle Preparation: Isolated mitochondria
Coupling state: LEAK, OXPHOS, ET Pathway: N, NS HRR: Oxygraph-2k