The autoradiographic localization of substance P receptors in the rat and bovine spinal cord and the rat and cat spinal trigeminal nucleus pars caudalis and the effects of neonatal capsaicin

Patrick W. Mantyh, Stephen P. Hunt

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

Substance P (SP) is a putative neurotransmitter in the central nervous system. In the present report we have used autoradiographic receptor binding techniques to investigate the distribution of SP receptor binding sites in the rat and bovine spinal cord and in the rat and cat spinal trigeminal nucleus pars caudalis. Although some quantitative differences were evident, all species appeared to have a similar distribution of SP receptor binding sites in both the spinal cord and in the spinal trigeminal nucleus pars caudalis. In the spinal cord the heaviest concentration of SP receptors is located in lamina X, while moderate to heavy concentrations were found in laminae I, II and V-IX. Very low concentrations of SP receptors were present in laminae III and IV. Examination of the cat and rat spinal trigeminal nucleus pars caudalis revealed a moderate density of SP receptor binding sites in laminae I and II, very low concentrations in laminae III and IV, and low to moderate concentrations in lamina V. Rats treated neonatally with capsaicin showed a small (11%) but significant (P < 0.02) increase in the levels of SP receptor binding sites in laminae I and II of the cervical and lumbar spinal cord while in all other laminae the levels remained unchanged.

Original languageEnglish (US)
Pages (from-to)315-324
Number of pages10
JournalBrain Research
Volume332
Issue number2
DOIs
StatePublished - Apr 22 1985
Externally publishedYes

Keywords

  • binding
  • capsaicin
  • neurotransmission
  • receptor autoradiography
  • spinal cord
  • substance P receptors

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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