Mechanisms mediating the effects of cholecystokinin on avian small intestine longitudinal smooth muscle

M. T. Martín, E. Fernández, A. G. Fernández, E. Goñalons

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    10 Citations (Scopus)


    The aims of this study were (1) to define the effects of CCK-8s and related peptides on chicken ileum longitudinal smooth muscle and (2) to explore the mechanisms by which such effects occur. The effects of CCK-8s were assayed in vitro on chicken longitudinal ileal strips. CCK-8s produced contraction of ileal strips (EC50 8.8·10-9 M). CCK-8ns and CCK-4 did not have remarkable contractile effects even when added at concentrations 200-times higher than the EC50 for CCK-8s. L365,260 slightly inhibited the effects of CCK-8s whereas L364,718 was ineffective. Tetrodotoxin (10-6 M) markedly decreased the effects of CCK-8s. Atropine (10-6 M) did not modify the neurally mediated effects of CCK-8s, whereas ketanserin (10-5 M) decreased the response to CCK-8s. Substance P-desensitized preparations exhibited reduced responses to CCK-8s. Our results indicate that CCK receptors present in chicken ileum behave similarly but not identically to the CCK-A receptor described in mammals. Most of these CCK receptors are neurally located but a minor proportion is also present on smooth muscle. The neurally mediated response to CCK-8s does not involve cholinergic mechanisms, but serotonin and substance P releasing neurons. © 1994.
    Original languageEnglish
    Pages (from-to)91-99
    JournalRegulatory Peptides
    Issue number2
    Publication statusPublished - 5 May 1994


    • Bird
    • Chicken
    • Gastrointestinal motility
    • L364,718
    • L365,260
    • Substance P


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