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1. Bradykinin and related kinins may act on four types of receptors designated as B1, B2, {B3} and B4. It seems that the {B2} receptors are most commonly found in various vascular and non-vascular smooth muscles, whereas {B1} receptors are formed in vitro during trauma, and injury, and are found in bone tissues. 2. These {BK} receptors are involved in the regulations of various physiological and pathological processes. 3. The mode of kinin actions are based upon the interactions between the kinin and their specific receptors, which can lead to activation of several second-messenger systems. 4. Recently, numerous {BK} receptor antagonists have been synthesized with prime aim to treat diseases caused by excessive kinin production. 5. These diseases are RA, inflammatory diseases of the bowel, asthma, rhinitis and sore throat, allergic reactions, pain, inflammatory skin disorders, endotoxin and anaphylactic shock and coronary heart diseases. 6. On the other hand, {BK} receptor antagonists could be contraindicated in hypertension, since these drugs may antagonize the antihypertensive therapy and/or may trigger the hypertensive crisis. 7. It is worth suggesting that the {BK} receptor agonists might be useful antihypertensive drugs.
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