Effect of chronic denervation and denervation-reinnervation on cytoplasmic creatine kinase transcript accumulation

Journal of Neurobiology
C H WashabaughM Ontell

Abstract

The extensor digitorum longus (EDL) and soleus muscles of adult mice were chronically denervated or denervated and allowed to reinnervate. Muscles were evaluated 1, 5, 14, 21, and 52 days after sciaticectomy. In terms of weight loss, myofiber atrophy, degeneration, and fibrosis, the soleus muscle was more affected than the EDL by chronic denervation. Fifty-two days after chronic denervation, the number of molecules of MCK/ng total RNA in both muscles (determined with competitive PCR) decreased, with the soleus muscle being more affected. At that stage, BCK mRNA levels in the denervated soleus were unchanged, but they were increased (>50%) in the EDL. Reinnervation restored MCK transcript accumulation in the EDL, whereas, in the soleus MCK, transcripts exceeded control values by 57%, approaching levels in the reinnervated EDL. Despite restoration of MCK mRNA levels, the number of molecules of BCK mRNA/ng total RNA was four- to fivefold higher in reinnervated versus control muscles, suggesting that the genes encoding the CK mRNAs are not coordinately regulated in adult muscle. The role of denervation induced, fiber type changes in regulating CK mRNA accumulation has been evaluated. Electron microscopic analyses have established t...Continue Reading

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Citations

Apr 28, 2005·Diabetes·Dustin S HittelJoseph A Houmard
Jun 6, 2006·Journal of Muscle Research and Cell Motility·Hualin SunXiaosong Gu
Jan 16, 2007·American Journal of Physiology. Cell Physiology·Z AshleyJ C Jarvis
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Apr 16, 2020·Toxicological Sciences : an Official Journal of the Society of Toxicology·Alastair KhodabukusNenad Bursac

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