Modulation of colonic motility by substance P, cholecystokinin and neuropeptide Y

Allen W. Mangel, J. Gregory Fitz, Ian L. Taylor

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The effects of substance P, cholecystokinin and neuropeptide Y were examined on rabbit distal colonic motility. All three agents produced increased contractile activity but the mechanisms responsible differed depending on the agent tested. In the intact animal, peptide effects were measured under basal conditions and following exposure to atropine, tetrodotoxin and the alpha-adrenergic antagonist phentolamine. Administration of all three peptides resulted in a stimulation of colonic motility. Phentolamine did not significantly effect substance P-, cholecystokinin- or neuropeptide Y-induced activity. By contrast, the in vivo activity induced by cholecystokinin and neuropeptide Y, but not substance P, was nearly eliminated by tetrodotoxin. Only the neuropeptide Y response was partially atropine sensitive. In isolated colonic strips, cholecystokinin-induced activity, but not that produced by neuropeptide Y or substance P, was blocked by tetrodotoxin. Atropine did not significantly inhibit any of the hormone-induced contractions.

Original languageEnglish (US)
Pages (from-to)1063-1067
Number of pages5
Issue number5
StatePublished - 1991


  • Cholecystokinin
  • Contraction
  • Gastrointestinal smooth muscle
  • Neuropeptide Y
  • Substance P

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Endocrinology
  • Cellular and Molecular Neuroscience


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