title: Mechanism of substance P-induced liquid secretion across bronchial epithelium.
abstract: The present study was undertaken to identify and determine the mechanism of noncholinergic pathways for the induction of liquid secretion across airway epithelium. Excised porcine bronchi secreted substantial and significant quantities of liquid when exposed to acetylcholine, substance P, or forskolin but not to isoproterenol, norepinephrine, or phenylephrine. Bumetanide, an inhibitor of Na(+)-K(+)-2Cl(-) cotransport, reduced the liquid secretion response to substance P by 69%. Approximately two-thirds of bumetanide-insensitive liquid secretion was blocked by dimethylamiloride (DMA), a Na(+)/H(+) exchange inhibitor. Substance P responses were preserved in airways after surface epithelium removal, suggesting that secreted liquid originated from submucosal glands. The anion channel blockers diphenylamine-2-carboxylate (DPC) and 5-nitro-2-(3-phenylpropylamino)benzoic acid (NPPB) inhibited >90% of substance P-induced liquid secretion, whereas DIDS had no effect. DMA, DPC, and NPPB had greater inhibitory effects on net HCO(3)(-) secretion than on liquid secretion. Although preserved relative to liquid secretion, net HCO(3)(-) secretion was reduced by 39% in the presence of bumetanide. We conclude that substance P induces liquid secretion from bronchial submucosal glands of pigs through active transport of Cl(-) and HCO(3)(-). The pattern of responses to secretion agonists and antagonists suggests that the cystic fibrosis transmembrane conductance regulator mediates this process.
authors.affiliation: Department of Physiology, College of Medicine, University of South Alabama, Mobile, Alabama 36688, USA. ltrout@bbl.usouthal.edu
authors.forename: L
authors.initials: L
authors.lastname: Trout
authors.forename: M R
authors.initials: MR
authors.lastname: Corboz
authors.forename: S T
authors.initials: ST
authors.lastname: Ballard
mesh_terms: D000818:Animals; D001639:Bicarbonates / Q000378:metabolism; D001826:Body Fluids / Q000378:metabolism*; D001980:Bronchi / Q000187:drug effects* / Q000378:metabolism*; D002121:Calcium Channel Blockers / Q000494:pharmacology; D004848:Epithelium / Q000187:drug effects / Q000378:metabolism; D066298:In Vitro Techniques; D009579:Nitrobenzoates / Q000494:pharmacology; D009994:Osmolar Concentration; D012016:Reference Values; D013373:Substance P / Q000494:pharmacology*; D013552:Swine; D062367:ortho-Aminobenzoates / Q000494:pharmacology
chemical_list: D001639:Bicarbonates; D002121:Calcium Channel Blockers; D009579:Nitrobenzoates; D062367:ortho-Aminobenzoates; D013373:Substance P; C058176:5-nitro-2-(3-phenylpropylamino)benzoic acid; C001209:fenamic acid