title: Inhibition of passive lung anaphylaxis in the rat by AY-25,674.
abstract: The antiallergic properties of AY-25,674 were studied in a model of passive lung anaphylaxis. AY-25,674 caused a dose-related inhibition of antigen-induced bronchoconstriction in the passively sensitized rat. AY-25,674 was found to be twice as potent as disodium cromoglycate (DSCG) when injected intravenously. The oral administration of AY-25,674 also effectively inhibited antigen-induced bronchoconstriction. A tachyphylactic effect of repeated administration was found when the rats were pretreated with a large dose of AY-25,674. The compound did not significantly antagonize the bronchoconstriction produced by 5-hydroxytryptamine. These results indicate that AY-25,674 is an orally effective antianaphylactic compound with a mode of action similar to that of DSCG in preventing allergic mediator release.
mesh_terms: D000707:Anaphylaxis / Q000150:complications / Q000188:drug therapy*; D000818:Animals; D001986:Bronchial Spasm / Q000276:immunology / Q000517:prevention & control; D004205:Cromolyn Sodium / Q000494:pharmacology; D003508:Cycloheptanes / Q000494:pharmacology*; D007651:Keto Acids / Q000494:pharmacology; D008168:Lung / Q000276:immunology; D008297:Male; D051381:Rats; D013618:Tachyphylaxis
chemical_list: D003508:Cycloheptanes; D007651:Keto Acids; D004205:Cromolyn Sodium