Abstract
Prolonged skeletal muscle disuse results in muscle atrophy. Currently, no therapeutic treatment is available for the prevention of this problem. Nonetheless, growing evidence suggests that prevention of disuse-induced oxidative stress in inactive muscle fibers can delay inactivity-induced muscle atrophy. We recently tested the hypothesis that dietary supplementation with the antioxidant astaxanthin (AX) might protect against disuse muscle atrophy, in part, by preventing myonuclear apoptosis. Seven-day unloading resulted in reduced soleus muscle weight and myofiber cross-sectional area. However, this decline was suppressed by AX supplementation. Further, AX prevented disuse-induced increase in the number of terminal deoxynucleotidyl transferase dUTP nick end labeling-positive nuclei. Our data showed that AX supplementation before and during hindlimb unloading attenuated soleus muscle atrophy, in part, by suppressing myonuclear apoptosis.
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