Capsaicin, a potent algogen, induces an itch-related behavior in the presence of inflammation. In this study, we tested whether bradykinin (BK) can evoke a similar response and investigated the potential mechanisms involved in this process. Local inflammation was induced by intradermal injection of complete Freund's adjuvant (CFA) into the back of the neck, left hind foot or left cheek of male C57BL/6J mice. BK was then injected intradermally into the same area on indicated days. Four days after CFA inflammation, BK treatment evoked scratching responses in a time- and dose-dependent manner. For BK receptor antagonist treatment, inflamed-mice were either given an intraperitoneal injection of B1 receptor (B1R) or B2 receptor (B2R) antagonist 30 min prior to BK administration, or an intradermal co-injection of antagonist and BK into the inflamed area. Our results indicate that B1R and B2R act in an opposite fashion during this process, as pretreatment with B1R antagonist by intraperitoneal injection significantly reduced BK-induced scratching behavior, whereas B2R antagonist treatment dramatically increased scratching behavior. Moreover, combined injection of BK and B2R antagonist enhanced BK-induced scratching activity in CFA-inflamed mice. In addition, pretreatment or co-injection with B2R antagonist dramatically reduced the pain-related licking behavior induced by BK injection. The data suggest that BK-induced scratching responses in CFA-inflamed mouse skin occur via activation of B1R. Furthermore, B1 and B2 receptors play different roles in modulating BK-induced itch-related behavior in CFA-inflamed mice.
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