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Studies show that irisin also acts as an autocrine\/paracrine to promote myogenesis and muscle growth. However, the protective role of irisin against muscular wasting remains unclear. We confirmed that irisin secretion was upregulated by electrical pulse stimulation an in vitro exercise mimetic model. Next, we tested if irisin exerted an anti-atrophic effect on cultured C2C12 myotubes treated with dexamethasone (DEX), a representative inducer of muscular atrophy. Treatment of cultured myotubes with DEX reduced myotube size and increased proteasome activity, which were attenuated by irisin. Also, irisin effectively prevented dephosphorylation of forkhead box O (FoxO) 3\u03b1 and upregulation of muscle-specific ubiquitin ligases in DEX-treated myotubes. The protective effect of irisin on DEX-mediated myotube atrophy was partially regulated by insulin-like growth factor-1-dependent signaling. These results suggested that irisin may prevent glucocorticoid-induced muscle atrophy by inhibiting FoxO-mediated ubiquitin-proteasome overactivity.<\/jats:p>","DOI":"10.1007\/s00424-020-02367-4","type":"journal-article","created":{"date-parts":[[2020,3,26]],"date-time":"2020-03-26T07:02:42Z","timestamp":1585206162000},"page":"495-502","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":68,"title":["Irisin prevents dexamethasone-induced atrophy in C2C12 myotubes"],"prefix":"10.1007","volume":"472","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4047-1128","authenticated-orcid":false,"given":"Jae Seung","family":"Chang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9821-6103","authenticated-orcid":false,"given":"In Deok","family":"Kong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,3,26]]},"reference":[{"key":"2367_CR1","doi-asserted-by":"publisher","first-page":"25","DOI":"10.1242\/dmm.010389","volume":"6","author":"P Bonaldo","year":"2013","unstructured":"Bonaldo P, Sandri M (2013) Cellular and molecular mechanisms of muscle atrophy. 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