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Different changes in contractile and histochemical properties of re innervated and regenerated slow soleus muscles of the guinea pig

Pfluegers Archiv European Journal of Physiology 364(2): 191-194

Different changes in contractile and histochemical properties of re innervated and regenerated slow soleus muscles of the guinea pig

The changes in contraction time (CT) and histochemical muscle fiber pattern are compared with respect to ATPase activity of the slow soleus muscle of the guinea-pig during regeneration in free grafts and reinnervation after nerve interruption. Interruption of the nerve by crushing at birth results first in prolongation of CT which later returns to normal (control) values. A homogeneous fiber pattern is established related to the homogeneity of the motor units constituting the muscle. In the regenerating muscle CT and muscle fiber pattern of the graft repeat the changes during postnatal development, i.e., CT shows progressive prolongation accompanied by transformation of a heterogeneous (fibers of high and low ATPase activity) to a homogeneous (fibers of low activity only) fiber pattern. The regenerating muscle also shows an initial phase with slow CT. Thus the changes in reinnervation and regeneration of the muscle after birth differ, the reinnervated muscle revealing only prolongation, the regenerated muscle a temporary shortening followed by prolongation, i.e., a biphasic development of CT.

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Accession: 005151975

PMID: 134353

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