Voluntary exercise increases axonal regeneration from sensory neurons

Proc Natl Acad Sci U S A. 2004 Jun 1;101(22):8473-8. doi: 10.1073/pnas.0401443101. Epub 2004 May 24.


Recent advances in understanding the role of neurotrophins on activity-dependent plasticity have provided insight into how behavior can affect specific aspects of neuronal biology. We present evidence that voluntary exercise can prime adult dorsal root ganglion neurons for increased axonal regeneration through a neurotrophin-dependent mechanism. Dorsal root ganglion neurons showed an increase in neurite outgrowth when cultured from animals that had undergone 3 or 7 days of exercise compared with sedentary animals. Neurite length over 18-22 h in culture correlated directly with the distance that animals ran. The exercise-conditioned animals also showed enhanced regrowth of axons after an in vivo nerve crush injury. Sensory ganglia from the 3- and 7-day-exercised animals contained higher brain-derived neurotrophic factor, neurotrophin 3, synapsin I, and GAP43 mRNA levels than those from sedentary animals. Consistent with the rise in brain-derived neurotrophic factor and neurotrophin 3 during exercise, the increased growth potential of the exercise-conditioned animals required activation of the neurotrophin signaling in vivo during the exercise period but did not require new mRNA synthesis in culture.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Brain-Derived Neurotrophic Factor / metabolism
  • Carbazoles / metabolism
  • Cells, Cultured
  • Enzyme Inhibitors / metabolism
  • Ganglia, Spinal / cytology
  • Indole Alkaloids
  • Nerve Growth Factors / metabolism
  • Nerve Regeneration / physiology*
  • Neurons, Afferent / cytology
  • Neurons, Afferent / physiology*
  • Physical Conditioning, Animal*
  • RNA, Messenger / metabolism
  • Receptor, trkA / metabolism
  • Running
  • Sciatic Nerve / metabolism
  • Sciatic Nerve / pathology
  • Synapsins / metabolism


  • Brain-Derived Neurotrophic Factor
  • Carbazoles
  • Enzyme Inhibitors
  • Indole Alkaloids
  • Nerve Growth Factors
  • RNA, Messenger
  • Synapsins
  • staurosporine aglycone
  • Receptor, trkA