Associated changes in Ca2+ and Sr2+ activation properties and fiber proteins in cross-reinnervated rabbit soleus

D. J. Secrist, W. G.L. Kerrick

Research output: Contribution to journalArticlepeer-review


Changes in the Ca2+ and Sr2+ activation properties of functionally skinned slow-twitch soleus fibers were measured and compared with those of normal fast-twitch extensor digitorum longus (EDL) following cross-reinnervation of soleus with the nerve to EDL. Most of the fibers showed either complete transformation of activation properties (66%) or remained unchanged (34%). The change in sensitivity to divalent cations was correlated with changes in the proteins present in fibers pooled on the basis of their activation properties. The banding patterns of the 35,000- and 37,500-dalton proteins (tropomyosin and troponin T) in cross-reinnervated soleus were correspondingly transformed to those of normal EDL. Slow and fast myosin light chains were present in the pooled cross-reinnervated fibers. Fiber distributions based on activation properties were confirmed by histochemical features. For the first time it has been demonstrated that cross-reinnervation produced changes in the activation properties of soleus fibers and associated changes in the regulatory proteins measured.

Original languageEnglish (US)
Pages (from-to)219-229
Number of pages11
JournalPflügers Archiv European Journal of Physiology
Issue number3
StatePublished - Apr 1 1980
Externally publishedYes


  • Calcium
  • Cross-reinnervation
  • Fiber types
  • Myosin light chains
  • Skinned fibers
  • Troponin

ASJC Scopus subject areas

  • Physiology


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