title: Evidence for the involvement of nitric oxide in the antinociceptive effect of ketorolac.
abstract: The involvement of nitric oxide in the antinociception produced by ketorolac was assessed using the pain-induced functional impairment model in the rat: 800 micrograms of NG-nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthesis, or saline was injected intra-articularly in a hind limb joint previously injured with uric acid. Animals then received ketorolac, dipyrone or no drug. Ketorolac and dipyrone produced a significant antinociceptive effect which was reduced by pretreatment with NG-nitro-L-arginine methyl ester, but not with saline. It is concluded that the antinociceptive effect of both drugs involves the local participation of nitric oxide.
mesh_terms: D000698:Analgesia; D018712:Analgesics, Non-Narcotic / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000494:pharmacology; D001120:Arginine / Q000031:analogs & derivatives* / Q000494:pharmacology; D002358:Cartilage, Articular / Q000187:drug effects / Q000378:metabolism; D004177:Dipyrone / Q000494:pharmacology; D005260:Female; D006614:Hindlimb; D020910:Ketorolac; D019331:NG-Nitroarginine Methyl Ester; D009569:Nitric Oxide / Q000037:antagonists & inhibitors*; D010147:Pain Measurement; D051381:Rats; D017208:Rats, Wistar; D014046:Tolmetin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D014527:Uric Acid / Q000633:toxicity
chemical_list: D018712:Analgesics, Non-Narcotic; D000894:Anti-Inflammatory Agents, Non-Steroidal; D014527:Uric Acid; D009569:Nitric Oxide; D004177:Dipyrone; D001120:Arginine; D014046:Tolmetin; D019331:NG-Nitroarginine Methyl Ester; D020910:Ketorolac