title: Involvement of thromboxane A2 in antigen-induced nasal blockage in guinea pigs.
abstract: To estimate the involvement of thromboxane (Tx) A2 in the onset of nasal blockage, we examined the effect of the selective TxA2 receptor antagonist, S-1452, as well as an H1-antihistamine, diphenhydramine, on the antigen-induced increase in intranasal pressure, as an index of nasal blockage, in anesthetized guinea pigs actively sensitized by inhalation of aerosolized ovalbumin (OA). Oral administration of S-1452 or intravenous administration of diphenhydramine significantly but incompletely reduced the increase in intranasal pressure following exposure of the nasal cavity of guinea pigs to aerosolized OA. In combination, the two agents were more effective than either alone, but there was no significant difference between them. The TxB2 level was significantly elevated in nasal lavage fluid 15 and 30 min after antigen challenge. Exposure of the nasal cavity of guinea pigs to aerosolized U-46619, a TxA2 mimetic, also resulted in a marked increase in intranasal pressure, and this could be almost completely suppressed by S-1452. These findings suggest that TxA2 contributes to antigen-induced nasal blockage in guinea pigs.
authors.affiliation: Discovery Research Laboratories II, Shionogi & Co., Ltd., Osaka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yasui
authors.forename: F
authors.initials: F
authors.lastname: Asanuma
authors.forename: Y
authors.initials: Y
authors.lastname: Furue
authors.forename: A
authors.initials: A
authors.lastname: Arimura
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000280:Administration, Inhalation; D000818:Animals; D000941:Antigens / Q000494:pharmacology*; D001643:Bridged Bicyclo Compounds / Q000494:pharmacology; D004155:Diphenhydramine / Q000494:pharmacology; D005229:Fatty Acids, Monounsaturated / Q000494:pharmacology; D006168:Guinea Pigs; D006632:Histamine / Q000494:pharmacology; D008297:Male; D015508:Nasal Obstruction / Q000209:etiology* / Q000276:immunology* / Q000378:metabolism; D010047:Ovalbumin / Q000276:immunology / Q000494:pharmacology; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D013928:Thromboxane A2 / Q000031:analogs & derivatives / Q000494:pharmacology / Q000502:physiology*; D013929:Thromboxane B2 / Q000096:biosynthesis
chemical_list: D000941:Antigens; D001643:Bridged Bicyclo Compounds; D005229:Fatty Acids, Monounsaturated; D011450:Prostaglandin Endoperoxides, Synthetic; C056566:S 145; D013929:Thromboxane B2; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D006632:Histamine; D004155:Diphenhydramine; D010047:Ovalbumin