Primary sensory neurones: Neurofilament, neuropeptides and conduction velocity

S. N. Lawson*, M. J. Perry, E. Prabhakar, P. W. McCarthy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

138 Citations (Scopus)


This paper reviews and provides new data on the relationship of the peptide content in rat dorsal root ganglion (DRG) neurones to a) the neurofilament content of the soma and b) the conduction velocities of the fibres. The latter involved intracellular recordings made in vitro followed by dye injection and immunocytochemistry. Because neurofilament-poor DRG neurones have C-fibres and A-fibre neurones are neurofilament rich, the soma neurofilament content of peptide containing neurones allowed predictions to be made about their conduction velocity ranges. Substance P-like immunoreactive (SP-LI) neurones were mostly small, neurofilament poor, but a few (15%) were neurofilament rich. From conduction velocity measurements, about half the C-fibre neurones studied and 10% of Aδ-neurones but no Aαδ- neurones showed SP-LI. CGRP-LI neurones were also mainly neurofilament poor neurones, but 32% were neurofilament rich, including small, medium and large neurones. Fibres of CGRP-LI neurones conducted in the C, Aδ or Aαβ ranges. Neurones with somatostatin-LI (SOM-LI) were all neurofilament poor; preliminary data is consistent with SOM-LI neurones having C-fibres.

Original languageEnglish
Pages (from-to)239-243
Number of pages5
JournalBrain Research Bulletin
Issue number3-4
Publication statusPublished - 1993


  • Conduction velocity
  • Dorsal root ganglia
  • GRP (calcitonin gene-related peptide)
  • Immunocytochemistry
  • Intracellular recordings
  • Neurofilament
  • Rat
  • Sensory neurones
  • Somatostatin
  • Substance P


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