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• W2117889118 abstract "Abstract Differentiation, maturation, and repair of skeletal muscle requires ongoing cooperation between signaling cascades activated by hormones and growth factors, and intrinsic regulatory programs controlled by myogenic transcription factors. The insulin‐like growth factor—phosphatidylinositol‐3 kinase—Akt pathway has been implicated in muscle growth and regeneration after injury, in counteracting sarcopenia during aging, and in maintaining muscle cell viability. Here we present evidence for distinct roles for Akt1 and Akt2 in different phases of muscle differentiation. Targeted knockdown of either Akt had no effect on C2 myoblast proliferation, even though Akt1 concentrations are markedly higher than Akt2 levels under growth‐promoting conditions. Akt2 concentrations rose by nearly an order of magnitude during muscle differentiation, while Akt1 levels remained constant, yet loss of either protein did not increase myoblast death. Rather, knockdown or genetic knockout of Akt1 blocked differentiation at its earliest stages, preventing induction of muscle‐specific proteins and inhibiting formation of multinucleated myofibers, while myoblasts lacking Akt2 differentiated normally, although resultant myofibers were thinner and incorporated fewer nuclei than controls. Forced expression of knockdown‐resistant Akt1 partially reversed the deficit in differentiation seen in myoblasts lacking Akt1. Our results define isoform‐specific Akt actions in muscle cells, and demonstrate that both Akts are necessary for full myoblast differentiation and maturation. J. Cell. Physiol. 219: 503–511, 2009. © 2009 Wiley‐Liss, Inc." @default.
• W2117889118 created "2016-06-24" @default.
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• W2117889118 date "2009-01-13" @default.
• W2117889118 modified "2023-10-15" @default.
• W2117889118 title "Distinct actions of Akt1 and Akt2 in skeletal muscle differentiation" @default.
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• W2117889118 doi "https://doi.org/10.1002/jcp.21692" @default.
• W2117889118 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2750805" @default.
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