Presynaptic modulation by noradrenaline and an opioid of the substance P-induced release of [3H]acetylcholine from the myenteric plexus

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Abstract

Substance P (7.5-750 nM) applied in superfusion dose-dependently released 3H from isolated strips of myenteric plexus-longitudinal muscle of the guinea-pig ileum loaded with [3H]choline. Separation of the [3H]acetylcholine and [3H]choline components of the released radioactivity revealed that in response to substance P (SP) administration only the release of [3H]acetylcholine increased above resting level. A slowly developing tachyphylaxis to the effect of SP was observed. Evidence has been obtained that the slow tachyphylaxis developed to the acetylcholine-releasing effect of SP was not due to the exhaustion of releasable acetylcholine pool. Release of acetylcholine by 150 nM SP was completely prevented by tetrodotoxin or in a Ca2+-free medium and greatly reduced in the presence of noradrenaline or the opioid receptor agonist (d-Met2,Pro5)-enkephalinamide. The effect of noradrenaline and the opioid peptide was apparently prevented by yohimbine and naloxone, respectively.

Original languageEnglish
Pages (from-to)317-325
Number of pages9
JournalRegulatory Peptides
Volume12
Issue number4
DOIs
Publication statusPublished - Nov 28 1985

Keywords

  • (d-Met,Pro)-enkephalinamide
  • acetylcholine release
  • alpha-adrenoceptors
  • choline kinase technique
  • enteric nervous system
  • opioid receptors

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Endocrinology
  • Clinical Biochemistry
  • Cellular and Molecular Neuroscience

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