title: Effect of three novel K+ channel openers, cromakalim, pinacidil and nicorandil on allergic reaction and experimental asthma.
abstract: The anti-allergic and anti-asthmatic activities of three potassium (K+) channel openers, cromakalim, pinacidil, and nicorandil, were investigated. 1) Forty-eight-hour homologous passive cutaneous anaphylaxis (PCA) in mice was not affected by cromakalim, pinacidil, or nicorandil. Ketotifen significantly inhibited the reaction. 2) Antigen-induced histamine release from sensitized guinea pig lung tissue was not affected by cromakalim, pinacidil or nicorandil (except for 10(-4) M nicorandil). Salbutamol inhibited the release of histamine. 3) Histamine, serotonin and LTC4-induced vasculitis in rat back skin was not affected by any of these three K+ channel openers. 4) Antigen-induced constriction of isolated sensitized guinea pig tracheal muscle was relaxed by each of the K+ channel openers. 5) Constrictions of isolated guinea pig tracheal muscle caused by high potassium, histamine, LTC4, or U-46619 were clearly relaxed by each of the three K+ channel openers. 6) Increases of airway resistance caused by histamine, LTD4, or U-46619 in guinea pigs in vivo were inhibited by administration of each of the three K+ channel openers. 7) Experimental asthma caused by the IgE antibody and antigen system in guinea pigs was inhibited by each of the three K+ channel openers.
authors.affiliation: Department of Pharmacology, Gifu Pharmaceutical University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nagai
authors.forename: K
authors.initials: K
authors.lastname: Kitagaki
authors.forename: S
authors.initials: S
authors.lastname: Goto
authors.forename: H
authors.initials: H
authors.lastname: Suda
authors.forename: A
authors.initials: A
authors.lastname: Koda
mesh_terms: D000403:Airway Resistance / Q000187:drug effects; D000818:Animals; D001249:Asthma / Q000503:physiopathology*; D001578:Benzopyrans / Q000494:pharmacology*; D001993:Bronchodilator Agents; D019806:Cromakalim; D006146:Guanidines / Q000494:pharmacology*; D006168:Guinea Pigs; D066298:In Vitro Techniques; D051379:Mice; D008815:Mice, Inbred Strains; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000494:pharmacology; D020108:Nicorandil; D010323:Passive Cutaneous Anaphylaxis / Q000187:drug effects; D020110:Pinacidil; D015221:Potassium Channels / Q000187:drug effects*; D011758:Pyrroles / Q000494:pharmacology*; D051381:Rats; D014132:Trachea / Q000187:drug effects; D014657:Vasculitis / Q000503:physiopathology
chemical_list: D001578:Benzopyrans; D001993:Bronchodilator Agents; D006146:Guanidines; D015221:Potassium Channels; D011758:Pyrroles; D019806:Cromakalim; D009536:Niacinamide; D020108:Nicorandil; D020110:Pinacidil