Abstract
1. Collagenases are thought to play a major role in the pathology of gas gangrene caused by Clostridium histolyticum, because they can destroy the connective tissue barriers. We investigated possible mediators involved in the oedema formation and plasma protein extravasation which follow the injection of a collagenase (EC 3.4.24.3) from Clostridium histolyticum into one hind paw of anaesthetized rats. 2. The magnitude of the oedema following a subplantar injection was dependent on the dose of collagenase (30, 100 and 300 micrograms) injected. It reached its maximum within 30 min and remained unchanged for at least 5 h. Plasma protein extravasation into the paw was most pronounced within 20 min of the injection. Heat-inactivated collagenase was ineffective. 3. The B2 bradykinin (BK) antagonist icatibant (D-Arg-[Hyp3-Thi5-D-Tic7- Oic8] bradykinin, formerly named Hoe-140) reduced oedema formation in a dose-dependent manner with a maximal reduction of around 65% at a dose of 100 nmol kg-1 (s.c.). A significant effect could already be observed at a dose of 10 nmol kg-1. The duration of the effect of icatibant (100 nmol kg-1) was found to be at least 3 h. These results demonstrate the high potency and long duration of action of icatibant. Pretreatment of rats with the bradykinin B1 antagonist, des-Arg9-[Leu8]-BK did not affect collagenase-induced paw oedema. Thus, the observed collagenase-induced effects are mainly mediated by BK through activation of B2 receptors.(ABSTRACT TRUNCATED AT 250 WORDS)
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