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

Summary

We have studied β-nerve growth factor (β-NGF) receptor expression in the injured and regenerating chick PNS using [¹²⁵I]-iodinated β-NGF as a radioactive probe to map and quantitate autoradiographically thein situ distribution of specific [¹²⁵I] β-NGF binding.

Two different mechanisms are involved in the reappearance of specific [¹²⁵I] β-NGF binding on the normally unlabelled adult peripheral nerves. The anterograde and retrograde axonal transport of β-NGF binding sites leads to a rapid but transient accumulation of [¹²⁵I] β-NGF binding on both sides of crushed or transected sciatic and brachial nerves. There is a dramatic decrease in the axonal transport of β-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] β-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] β-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] β-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 β-NGF following axotomy and during regeneration.