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Two corticotropin-releasing factor 2 receptor (CRF2R)-selective peptides have been recently described, urocortin II (also known as stresscopin-related peptide) and urocortin III (stresscopin). We have used urocortin II to evaluate the effects of activation of the CRF2R on skeletal muscle-related physiological processes. Administration of urocortin II to mice prevented the loss of skeletal muscle mass resulting from disuse due to casting, corticosteroid treatment, and nerve damage. In addition, urocortin II treatment prevented the loss of skeletal muscle force and myocyte cross-sectional area that accompanied muscle mass losses resulting from disuse due to casting. Finally, we observed increased skeletal muscle mass and force in normal muscles when mice are treated with urocortin II. These results were confirmed using two additional CRF2R agonists, urocortin I and sauvagine. Thus, activation of the CRF2R modulates skeletal muscle mass in both normal and atrophying muscle. Therefore, CRF2R-selective agonists may find utility in the treatment of skeletal muscle wasting diseases including age-related muscle loss or sarcopenia.

Urocortin II Treatment Reduces Skeletal Muscle Mass and Function Loss During Atrophy and Increases Nonatrophying Skeletal Muscle Mass and Function