The effects of SRS-A and histamine antagonists on antigen-induced contraction of guinea pig trachea

European Journal of Pharmacology
J F Burka, N A Paterson


Spirally cut tracheae from actively sensitized guinea pigs were challenged with antigen in the presence and absence of indomethacin. In the absence of indomethacin, the SRS-A antagonist FPL55712, added 30 min before challenge had no effect on antigen-induced contraction (ATC) when added in concentrations less than or equal to 1.7 X 10(-6) M. However with the highest concentration employed (5.2 X 10(-6) M) the duration of ATC was reduced by 45%. Furthermore the enhancement by indomethacin of the peak height of ATC was reduced even by lower (5.2 X 10(-7) M) concentrations of FPL55712. The inhibition of FPL55712 was time-dependent, suggesting that its action was not confined to competitive receptor antagonism. Hence, although our previous data indicate that a lipoxygenase product is involved in ATC, the current findings suggest that lipoxygenase products in addition to SRS-A contribute to the response. THe H1-antagonists mepyramine, chlorpheniramine and diphenhydramine inhibited ATC only in the first minute, and the peak height was reduced only by diphenhydramine. The H2-antagonist cimetidine had no effect on ATC. These data suggest that the contribution of histamine to ATC is small, confined to the first minute following antigen ...Continue Reading


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