dnRas stimulates autocrine-paracrine growth of regenerating muscle via calcineurin-NFAT-IL-4 pathway.

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3 Citations (Scopus)


Ras and calcineurin are members of two independent pathways in muscle growth but their interaction is not known. This work shows that the transfection of about 1% of the muscle fibers with dominant negative Ras (dnRas) shows a wilder effect; it stimulates the fiber growth in the entire regenerating soleus muscle, including the nontransfected fibers. Co-transfection with the calcineurin inhibitor cain/cabin prevented the growth stimulation. Injection of antibody for interleukin-4 (IL-4) also abolished the growth ameliorating effect. These results suggest that the inactivation of Ras in 1% of the fibers upregulates the calcineurin-NFAT-IL-4 pathway and the secreted IL-4 triggers fiber growth stimulation in the whole regenerating soleus muscle of the rat. The results highlight the importance of the autocrine-paracrine regulation in muscle regeneration and hint to a novel method of gene theraphy of degenerative-regenerative muscle dystrophies.

Original languageEnglish
Pages (from-to)265-270
Number of pages6
JournalBiochemical and biophysical research communications
Issue number2
Publication statusPublished - Oct 17 2008

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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