Effects of L-156,602, a C5a Receptor Antagonist, on Mouse Experimental Models of Inflammation

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Abstract
L-156,602, a C5a receptor antagonist, was found as an immunosuppressant with preferential effects on delayed-type hypersensitivity (DTH) in our screening program and it was shown that L-156,602 suppressed the efferent phase of DTH. Here, we tested its effects on experimental models of inflammation induced in mice. L-156,602 did not suppress serotonin- and carrageenan- induced inflammation while it completely suppressed concanavalin A-induced inflammation 4 h after elicitation. The inflammation appeared 24 h after the elicitation with concanavalin A and it was significantly suppressed by L-156,602. Muramyl dipeptide (MDP)-induced acute joint inflammation was also significantly suppressed by L-156,602. These results demonstrated the unique immunomodulating properties of L-156,602 in mouse experimental models of inflammation.

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