We examined a possible involvement of cyclooxygenase (COX) and nitric oxide synthase (NOS) products in hyperalgesia occurring during streptozotocin (STZ)-induced diabetes. Indomethacin and celecoxib were used as relatively selective inhibitors of COX-1 and COX-2, respectively. NOS inhibitors included: non-specific inhibitor NG-nitro-L-arginine and L-N6-(1-iminoethyl)lysine preferentially acting on inducible NOS (iNOS) as well as 7-nitroindazole relatively specific inhibitor neuronal NOS (nNOS). The above-mentioned agents, except 7-nitroindazole, suppressed hyperalgesia occurring after administration of STZ. The results of the study suggest participation of COX-1, COX-2 and iNOS, but not nNOS, in transmission of pain stimuli in STZ-induced diabetic hyperalgesia.

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