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Previous Article | Next Article
The Journal of Neuroscience, April 1, 2000, 20(7):2602-2608
Brief Electrical Stimulation Promotes the Speed and Accuracy of Motor Axonal Regeneration
Abdulhakeem A. Al-Majed1, Catherine M. Neumann1, Thomas M. Brushart2, and Tessa Gordon1 1 Department of Pharmacology, Division of Neuroscience, University of Alberta, Edmonton, Alberta T6G 2S2, Canada, and 2 Departments of Orthopedic Surgery and Neurology, Johns Hopkins Medical School, Baltimore, Maryland
Functional recovery is often poor despite the capacity for axonal regeneration in the peripheral nervous system and advances in microsurgical technique. Regeneration of axons in mixed nerve into inappropriate pathways is a major contributing factor to this failure. In this study, we use the rat femoral nerve model of transection and surgical repair to evaluate (1) the effect of nerve transection on the speed of regeneration and the generation of motor-sensory specificity, (2) the efficacy of electrical stimulation in accelerating axonal regeneration and promoting the reinnervation of appropriate muscle pathways by femoral motor nerves, and (3) the mechanism of action of electrical stimulation. Using the retrograde neurotracers fluorogold and fluororuby to backlabel motoneurons that regenerate axons into muscle and cutaneous pathways, we found the following. (1) There is a very protracted period (10 weeks) of axonal outgrowth that adds substantially to the delay in axonal regeneration (staggered regeneration). This process of staggered regeneration is associated with preferential motor reinnervation (PMR). (2) One hour to 2 weeks of 20 Hz continuous electrical stimulation of the parent axons proximal to the repair site dramatically reduces this period (to 3 weeks) and accelerates PMR. (3) The positive effect of short-term electrical stimulation is mediated via the cell body, implicating an enhanced growth program. The effectiveness of such a short-period low-frequency electrical stimulation suggests a new therapeutic approach to accelerate nerve regeneration after injury and, in turn, improve functional recovery.
Key words: electrical stimulation; staggered regeneration; motoneuron; TTX; PMR; retrograde labeling
Copyright © 2000 Society for Neuroscience 0270-6474/00/2072602-07$05.00/0
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