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  • Title: Myosin heavy chain mRNA and protein expression in single fibers of the rat soleus following reinnervation.
    Author: Bodine SC, Pierotti DJ.
    Journal: Neurosci Lett; 1996 Aug 30; 215(1):13-6. PubMed ID: 8880742.
    Abstract:
    Myosin heavy chain (MHC) expression is regulated by many factors including neural input. To gain a better understanding of myosin transformation following reinnervation we examined both MHC protein and mRNA in single fibers of the soleus. A midthigh sciatic nerve lesion resulted in reinnervation of the soleus by motoneurons from both original and foreign motor pools. MHC expression was examined in individual fibers 8 and 16 weeks post injury in situ histochemistry and immunohistochemistry. Following a sciatic nerve lesion, the reinnervated soleus underwent a transformation from slow toward fast based on physiologic and biochemical measurements. At 8 weeks, fast MHC mRNA isoforms (IIa and IIx) were upregulated and slow mRNA was downregulated, however, the predominant protein isoform was MHC I. At both 8 and 16 weeks, many fibers expressed multiple mRNA isoforms. At 16 weeks there was limited co-expression of slow and fast MHC mRNAs, but continued co-expression of fast MHC mRNAs. Sixteen weeks following reinnervation the predominant fast mRNA and protein in the soleus was IIx MHC.
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