title: Effect of bismuth subcitrate on amphibian gastroduodenal bicarbonate secretion.
abstract: The ulcer healing and cytoprotective properties of colloidal bismuth (De-Nol) are well established although its mode of action is unclear. We have examined the action of bismuth subcitrate, the active ingredient of De-Nol, on gastroduodenal bicarbonate secretion by isolated amphibian mucosa. Addition of bismuth subcitrate (10(-6) to 10(-4) M) to the luminal solution produced a dose dependent increase in bicarbonate secretion from both gastric and duodenal mucosae without a change in transmucosal potential difference. The magnitude of this stimulation was greater for gastric than duodenal mucosae at all dose ranges. A second bismuth salt, bismuth oxynitrate, produced similar increases in bicarbonate secretion from gastric mucosae. Pretreatment of gastric mucosa with the cyclooxygenase inhibitor, indomethacin (10(-5) and 10(-4) M), did not abolish the secretory response to bismuth subcitrate. Similar treatment with the chloride transport inhibitor, 4-acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic acid (SITS) (10(-3) M) prevented the secretory response to bismuth subcitrate.
authors: Department of Gastroenterology, Hope Hospital, University of Manchester School of Medicine, Salford.
authors: C J
authors: CJ
authors: Shorrock
authors: J R
authors: JR
authors: Crampton
authors: L C
authors: LC
authors: Gibbons
authors: W D
authors: WD
authors: Rees
mesh_terms: D000818:Animals; D000863:Antacids / Q000494:pharmacology; D000897:Anti-Ulcer Agents / Q000494:pharmacology; D001639:Bicarbonates / Q000378:metabolism*; D001729:Bismuth / Q000494:pharmacology*; D004386:Duodenum / Q000187:drug effects / Q000378:metabolism*; D005753:Gastric Mucosa / Q000187:drug effects / Q000378:metabolism*; D007213:Indomethacin / Q000494:pharmacology; D007413:Intestinal Mucosa / Q000187:drug effects / Q000378:metabolism*; D009942:Organometallic Compounds / Q000494:pharmacology*; D011896:Rana temporaria
chemical_list: D000863:Antacids; D000897:Anti-Ulcer Agents; D001639:Bicarbonates; D009942:Organometallic Compounds; C002791:bismuth tripotassium dicitrate; D001729:Bismuth; D007213:Indomethacin