Neuromodulation of ion transport in porcine distal colon: NPY reduces secretory actions of leukotrienes

T. R. Traynor, D. R. Brown, S. M. O'Grady

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Electrical transmural stimulation (ETS) was used to examine the neuroregulation of electrolyte transport in the porcine distal colon. ETS of the colonic mucosa-submucosa mounted in Ussing chambers produced rapid and transient increases in short-circuit current (I(sc)) that were inhibited 36% by serosal bumetanide, suggesting that a portion of the response may be attributed to Cl secretion. ETS actions were dependent upon stimulus intensity and frequency and were inhibited by tetrodotoxin and ω-conotoxin. Prazosin and pyrilamine had no effect on the mucosal responses to ETS, whereas atropine reduced the responses by 32%. Neuropeptide Y (NPY) also reduced the mucosal responses to ETS up to 60% (half-maximal effective concentration = 17 nM). In addition, the effects of leukotriene C4, previously shown to stimulate Cl secretion via a neuronal pathway, were also inhibited by NPY. These results indicate that cholinergic submucosal neurons play a role in the regulation of epithelial ion transport and that NPY acts as an inhibitory neuromodulator, particularly on leukotriene-sensitive neurons in the porcine distal colon.

Original languageEnglish (US)
Pages (from-to)R426-R431
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Issue number2 38-2
StatePublished - 1995


  • colonic secretion
  • enteric neurons
  • inflammation
  • sulfidopeptide leukotrienes

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