실험연구 : 백서의 급성 관절염 모델에서 Diclofenac, SC-560, NS-398의 말초 및 항염증 효과

Background: Non steroidal anti-inflammatory drugs (NSAIDs) are generally attributed to suppression cyclooxygenase enzymes, leading to decreased products of the arachidonic acid cascade. Since the discovery of two isoenzytnes of cyclooxygenase, inhibition of cyclooxygenase 2 has been suggested to be resposible for therapeutic effects of NSAIDs without side effects. In the present study, to investigate the extent to peripheral nociception and inflammation of cyclooxygenase-1 and cyclooxygenase-2, diclofenac (non-selective inhibitor), SC-560 (selective cyclooxygenase-1 inhibitor) and NS-398 (selective cyclooxygenase-2 inhibitor) are injected intra articularly on acute arthritic model in rats. Methods: Arthritis was induced with 2% Ancarrageenan (suspended in 50 ㎕ normal saline) into the right knee joint cavity under enflurane anesthasia (2-4%). Before and after the injection, rats were allowed to walk freely through a pathway constructed to record weight load by means of 8 weight sensors (strain gauge type) attached to 8 plates which function independently. The weight load, diameter of both knee joints and weight of rat were measured at each test. At 4 hours and 30 minutes, diclofenac, SC-560 and NS-398 dissolved in 10% dimethyl sulfoxide were injected intra-articulary (50㎍/50 ㎕). Results: The weight loads increased in diclofenac group at 6 and 9 hours and in NS-398 group at 24 and 48 hours after induction of arthritis. The diameter ratio decreased in diclofenac group at 12 hours after induction of arthritis. Conclusions: These results suggest that peripheral nociception and inflammation in acute model of arthritis in rats are likely ralated with both cyclooxygenase-1 and cyclooxygenase-2 pathways. (Korean J Anesthesiol 2004; 46: 336∼341)