Protein kinase D1 stimulates MEF2 activity in skeletal muscle and enhances muscle performance

Item Type:	Article
Title:	Protein kinase D1 stimulates MEF2 activity in skeletal muscle and enhances muscle performance
Creators Name:	Kim, M.S. and Fielitz, J. and McAnally, J. and Shelton, J.M. and Lemon, D.D. and McKinsey, T.A. and Richardson, J.A. and Bassel-Duby, R. and Olson, E.N.
Abstract:	Skeletal muscle consists of type I and type II myofibers, which exhibit different metabolic and contractile properties. Type I fibers display an oxidative metabolism and are resistant to fatigue, whereas type II fibers are primarily glycolytic and suited for rapid bursts of activity. These properties can be modified by changes in workload, activity, and hormonal stimuli, facilitating muscle adaptation to physiological demand. The MEF2 transcription factor promotes the formation of slow-twitch (type I) muscle fibers in response to activity. MEF2 activity is repressed by class II histone deacetylases (HDACs) and is enhanced by calcium-regulated protein kinases that promote the export of class II HDACs from the nucleus to the cytoplasm. However, the identities of skeletal muscle class II HDAC kinases are not well defined. Here we demonstrate that protein kinase D1 (PKD1), a highly effective class II HDAC kinase, is predominantly expressed in type I myofibers and, when misexpressed in type II myofibers, promotes transformation to a type I, slow-twitch, fatigue-resistant phenotype. Conversely, genetic deletion of PKD1 in type I myofibers increases susceptibility to fatigue. PKD1 cooperates with calcineurin to facilitate slow-twitch-fiber transformation. These findings identify PKD1 as a key regulator of skeletal muscle function and phenotype.
Keywords:	Calcineurin, Gene Deletion, Muscle Fatigue, Muscle Proteins, Myogenic Regulatory Factors, Protein Kinase C, Signal Transduction, Skeletal Muscle, Slow-Twitch Muscle Fibers, Animals, Mice, Transgenic Mice
Source:	Molecular and Cellular Biology
ISSN:	0270-7306
Publisher:	American Society for Microbiology
Volume:	28
Number:	11
Page Range:	3600-3609
Date:	June 2008
Official Publication:	https://doi.org/10.1128/MCB.00189-08
PubMed:	View item in PubMed

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