Selective C-fiber deafferentation of the spinal dorsal horn prevents lesion-induced transganglionic transport of choleragenoid to the substantia gelatinosa in the rat

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Abstract

The effect of neonatal capsaicin treatment, producing selective elimination of almost all unmyelinated C-fiber sensory axons, was studied on lesion-induced transganglionic labelling of the substantia gelatinosa of the spinal cord by choleragenoid. In both control and capsaicin-pretreated rats, the injection of choleragenoid-horseradish peroxidase conjugate into the intact sciatic nerves resulted in intense labelling only of the deeper layers of the spinal dorsal horn. In the control but not the capsaicin-pretreated rats, the injection of the tracer into sciatic nerves transected 2 weeks previously produced an intense homogeneous labelling of the substantia gelatinosa. It is concluded that the uptake and axonal transport of choleragenoid by capsaicin-sensitive C-fiber afferents may be accounted for by the lesion-induced transganglionic labelling of the substantia gelatinosa, rather than by A-fiber sprouting.

Original languageEnglish
Pages (from-to)204-207
Number of pages4
JournalNeuroscience Letters
Volume361
Issue number1-3
DOIs
Publication statusPublished - May 6 2004

Keywords

  • Capsaicin
  • Choleratoxin B subunit
  • Nerve transection
  • Pain
  • Plasticity
  • Sensory ganglion
  • Sprouting

ASJC Scopus subject areas

  • Neuroscience(all)

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