Expression of growth factor receptors in injured nervous tissue. I. Axotomy leads to a shift in the cellular distribution of specific beta-nerve growth factor binding in the injured and regenerating PNS

J Neurocytol. 1987 Oct;16(5):689-700. doi: 10.1007/BF01637660.


We have studied beta-nerve growth factor (beta-NGF) receptor expression in the injured and regenerating chick PNS using [125I]-iodinated beta-NGF as a radioactive probe to map and quantitate autoradiographically the in situ distribution of specific [125I] beta-NGF binding. Two different mechanisms are involved in the reappearance of specific [125I] beta-NGF binding on the normally unlabelled adult peripheral nerves. The anterograde and retrograde axonal transport of beta-NGF binding sites leads to a rapid but transient accumulation of [125I] beta-NGF binding on both sides of crushed or transected sciatic and brachial nerves. There is a dramatic decrease in the axonal transport of beta-NGF binding sites, starting 1 day after nerve injury (1 DPO) and reaching basal levels of 10-20% of the control values at 3 to 10 DPO. Gradual but complete recovery of this axonal transport was noted in the sciatic neurites allowed to regain contact with their peripheral targets. A very different regulation pattern was observed for the local reappearance of specific [125I] beta-NGF binding on the endoneurial Schwann cells throughout the distal part of the axotomized nerve. It was first observed at 4 DPO, becoming maximal at 6 DPO. Reinnervation of the nerve after crush led to a rapid decrease of this specific [125I] beta-NGF binding, which followed a proximo-distal temporal gradient. These results show that axotomy leads to a drastic decrease in the axonal expression of [125I] beta-NGF binding, while causing its appearance on the Schwann cells of the denervated endoneurium. They suggest that these endoneurial cells may become the primary target for beta-NGF following axotomy and during regeneration.

MeSH terms

  • Animals
  • Autoradiography
  • Chickens
  • Iodine Radioisotopes
  • Kinetics
  • Nerve Growth Factors / metabolism*
  • Nerve Regeneration*
  • Receptors, Cell Surface / biosynthesis*
  • Receptors, Cell Surface / metabolism
  • Receptors, Nerve Growth Factor
  • Sciatic Nerve / cytology
  • Sciatic Nerve / injuries
  • Sciatic Nerve / physiology*


  • Iodine Radioisotopes
  • Nerve Growth Factors
  • Receptors, Cell Surface
  • Receptors, Nerve Growth Factor