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. 1985 Jul;82(13):4544–4548. doi: 10.1073/pnas.82.13.4544

Neural cell adhesion molecule (N-CAM) accumulates in denervated and paralyzed skeletal muscles.

J Covault, J R Sanes
PMCID: PMC391139  PMID: 3892537

Abstract

We have used immunofluorescence and immunoblotting methods to study the amount and distribution of the neural cell adhesion molecule (N-CAM) in rat skeletal muscle; this molecule is thought to mediate adhesion of neurons to cultured myotubes. N-CAM is present on the surface of embryonic myotubes, but it is lost as development proceeds and is nearly absent from adult muscle. However, denervation of adult muscle results in the reappearance of N-CAM. In denervated muscle, N-CAM is associated both with muscle fibers and with cells in interstitial spaces between fibers. The N-CAM in interstitial spaces is concentrated near denervated endplates, which are known to be preferential sites for reinnervation. Paralysis of innervated muscle, known to mimic denervation in many respects, also induces the accumulation of N-CAM. Axons that regenerate to reinnervate muscle bear N-CAM on their terminals, and reinnervation results in the disappearance of N-CAM from muscle. Denervation induces accumulation of N-CAM in mouse and chicken, as well as in rat muscles. Thus, the expression of N-CAM in muscle is regulated by the muscle's state of innervation. In that N-CAM-rich muscles (embryonic, denervated, and paralyzed) are known to be competent to accept synapses, while N-CAM-poor muscles (normal adult and reinnervated) are refractory to hyperinnervation, N-CAM might, in turn, participate in regulating muscle's susceptibility to innervation.

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