Kinins are small peptides which are produced in the blood or tissues during
inflammation. They act by stimulating distinct receptors, B-1 and B-2. The
B-1 receptor is induced during inflammation whereas the B-2 receptor is co
nstitutively expressed. Kinins produce a number of effects which are releva
nt for airway pathophysiology (bronchoconstriction, plasma protein extravas
ation, mucus secretion, stimulation of inflammatory cells). It is currently
proposed that kinin receptor antagonists could represent a novel class of
drugs useful for the treatment of chronic airway diseases, including asthma
.