Treadmill exercise induced functional recovery after peripheral nerve repair is associated with increased levels of neurotrophic factors

PLoS One. 2014 Mar 11;9(3):e90245. doi: 10.1371/journal.pone.0090245. eCollection 2014.

Abstract

Benefits of exercise on nerve regeneration and functional recovery have been reported in both central and peripheral nervous system disease models. However, underlying molecular mechanisms of enhanced regeneration and improved functional outcomes are less understood. We used a peripheral nerve regeneration model that has a good correlation between functional outcomes and number of motor axons that regenerate to evaluate the impact of treadmill exercise. In this model, the median nerve was transected and repaired while the ulnar nerve was transected and prevented from regeneration. Daily treadmill exercise resulted in faster recovery of the forelimb grip function as evaluated by grip power and inverted holding test. Daily exercise also resulted in better regeneration as evaluated by recovery of compound motor action potentials, higher number of axons in the median nerve and larger myofiber size in target muscles. Furthermore, these observations correlated with higher levels of neurotrophic factors, glial derived neurotrophic factor (GDNF), brain derived neurotrophic factor (BDNF) and insulin-like growth factor-1 (IGF-1), in serum, nerve and muscle suggesting that increase in muscle derived neurotrophic factors may be responsible for improved regeneration.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Disease Models, Animal
  • Electrophysiological Phenomena
  • Exercise*
  • Humans
  • Male
  • Mice
  • Motor Neurons / physiology
  • Muscle Strength
  • Muscle, Skeletal / physiology
  • Nerve Growth Factors / blood
  • Nerve Growth Factors / metabolism*
  • Nerve Regeneration*
  • Peripheral Nerve Injuries / metabolism*
  • Peripheral Nerve Injuries / pathology
  • Peripheral Nerve Injuries / rehabilitation*
  • Physical Conditioning, Animal

Substances

  • Nerve Growth Factors

Grant support

This study was supported by Dr. Miriam and Sheldon Adelson Medical Research Foundation and Ansari Center for Cell Therapy and Regeneration Research. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.