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Mechanisms controlling axonal sprouting at the neuromuscular junction

  • Published:
Journal of Neurocytology

Abstract

This review considers the relative roles of sprouting stimuli, perisynaptic Schwann cells and neuromuscular activity in axonal sprouting at the neuromuscular junction in partially denervated muscles. A number of sprouting stimuli, including insulin-like growth factor II, which are generated from inactive muscle fibers in partially denervated and paralyzed skeletal muscles, has been considered. There is also evidence that perisynaptic Schwann cells induce and guide axonal sprouting in adult partially denervated muscles. Excessive neuromuscular activity significantly reduces bridging of perisynaptic Schwann cell processes between innervated and denervated endplates and thereby inhibits axonal sprouting in partially denervated adult muscles. Elimination of neuromuscular activity is also detrimental to sprouting in these muscles, suggesting that calcium influx into the nerve is crucial for axonal sprouting. The role of neuromuscular activity in axonal sprouting will be considered critically in the context of the roles of sprouting stimuli and perisynaptic Schwann cells in the process of axonal sprouting.

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  1. Centre of Neuroscience, Division of Physical Medicine and Rehabilitation, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada, T6G 2S2

    Siu Lin Tam & Tessa Gordon

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Tam, S.L., Gordon, T. Mechanisms controlling axonal sprouting at the neuromuscular junction. J Neurocytol 32, 961–974 (2003). https://doi.org/10.1023/B:NEUR.0000020635.41233.0f

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