Influence of B2 receptor antagonists on bradykinin-induced vasodilation and edema formation in isolated rabbit...

In search of new possibilities to prevent acute inflammatory vascular reaction, we examined the effect of two selective B2 receptor antagonists, CP 0127 ([Bissuccimidohexane (L-Cys6)-1] and HOE 140 (D-Arg[Hyp3, Thi5, D-Tic7, Oic8]BK), on changes in perfusion pressure and on edema formation caused by bradykinin (BK) in the isolated perfused rabbit hindlimbs. CP 0127 and HOE 140 were added to the perfusion fluid 2 min prior to the first BK-administration (5 x 10(-9) mol/l). A second BK-stimulation was performed after 30 minutes. The antagonists were tested in groups of 6 experiments each at concentrations of 10(-6) mol/l, 5 x 10(-9) mol/l and 10(-10) mol/l. CP 0127 was also tested in a concentration of 10(-8) mol/l. The application of BK resulted in an acute decrease of the mean arterial pressure and in a continual edema formation, reflected by an increase of organ weight (controls, n = 6). Pretreatment with CP 0127 as well as with HOE 140 attenuated dose-dependently the BK-induced vasodilation (p < 0.005) and edema formation. The current results indicate that CP 0127 and HOE 140 are able to reduce BK-induced effects on vascular tone and edema formation.