Skeletal muscle adaptation in response to voluntary running in Ca2+/calmodulin-dependent protein kinase IV-deficient mice

American Journal of Physiology. Cell Physiology
Takayuki AkimotoZhen Yan

Abstract

Mammalian skeletal muscles undergo adaptation in response to alteration in functional demands by means of a variety of cellular signaling events. Previous experiments in transgenic mice showed that an active form of Ca2+/calmodulin-dependent protein kinase IV (CaMKIV) is capable of stimulating peroxisome proliferator-activated receptor gamma-coactivator 1alpha (PGC-1alpha) gene expression, promoting fast-to-slow fiber type switching and augmenting mitochondrial biogenesis in skeletal muscle. However, a role for endogenous CaMKIV in skeletal muscle has not been investigated rigorously. We report that genetically modified mice devoid of CaMKIV have normal fiber type composition and mitochondrial enzyme expression in fast-twitch skeletal muscles and responded to long-term (4 wk) voluntary running with increased expression of myosin heavy chain type IIa, myoglobin, PGC-1alpha, and cytochrome c oxidase IV proteins in plantaris muscle in a manner similar to that of wild-type mice. Short-term motor nerve stimulation (2 h at 10 Hz) likewise increased PGC-1alpha mRNA expression in tibialis anterior muscles in both Camk4(-/-) and wild-type mice. In addition, we have confirmed that no detectable CaMKIV protein is expressed in murine skele...Continue Reading

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