Abstract:The effects of bradykinin, leukotriene (LT) B4 and LTD4 on the bovine bronchial artery were studied using isolated, perfused vessel segments. Intrapulmonary bronchial arteries were precontracted to the EC50 of 5-hydroxytryptamine in the organ bath, after which increasing concentrations of bradykinin, LTB4 or LTD4 were perfused through the vessel lumen. In arteries with intact endothelium, bradykinin induced a concentration-dependent relaxation beginning at 1 pmol/l (p less than 0.01), whereas LTD4 and LTB4 had… Show more
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