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Di Marcantonio D , Galli D , Carubbi C , Gobbi G , Queirolo V , Martini S , Merighi S , Vaccarezza M , Maffulli N , Sykes SM , Vitale M , Mirandola P
PKCepsilon as a novel promoter of skeletal muscle differentiation and regeneration
Exp Cell Res. 2015 Nov 15;339(1) :10-9
PMID: 26431586    PMCID: PMC5130411    URL: http://www.ncbi.nlm.nih.gov/pubmed/26431586
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Abstract
INTRODUCTION: Satellite cells are muscle resident stem cells and are responsible for muscle regeneration. In this study we investigate the involvement of PKCepsilon during muscle stem cell differentiation in vitro and in vivo. Here, we describe the identification of a previously unrecognized role for the PKCepsilon-HMGA1 signaling axis in myoblast differentiation and regeneration processes. METHODS: PKCepsilon expression was modulated in the C2C12 cell line and primary murine satellite cells in vitro, as well as in an in vivo model of muscle regeneration. Immunohistochemistry and immunofluorescence, RT-PCR and shRNA silencing techniques were used to determine the role of PKCepsilon and HMGA1 in myogenic differentiation. RESULTS: PKCepsilon expression increases and subsequently re-localizes to the nucleus during skeletal muscle cell differentiation. In the nucleus, PKCepsilon blocks Hmga1 expression to promote Myogenin and Mrf4 accumulation and myoblast formation. Following in vivo muscle injury, PKCepsilon accumulates in regenerating, centrally-nucleated myofibers. Pharmacological inhibition of PKCepsilon impairs the expression of two crucial markers of muscle differentiation, namely MyoD and Myogenin, during injury induced muscle regeneration. CONCLUSION: This work identifies the PKCepsilon-HMGA1 signaling axis as a positive regulator of skeletal muscle differentiation.
Notes
Di Marcantonio, D Galli, D Carubbi, C Gobbi, G Queirolo, V Martini, S Merighi, S Vaccarezza, M Maffulli, N Sykes, S M Vitale, M Mirandola, P Exp Cell Res. 2015 Sep 30. pii: S0014-4827(15)30100-2. doi: 10.1016/j.yexcr.2015.09.017.