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说明:关键词: 一氧化氮(NO), 关节疾病,炎症
一氧化氮(nitric oxide,NO)是由L-精氨酸(L-arginine,L-Arg)胍基氮经NO合酶(NO synthase,NOS)的催化发生氧化而形成。NO既兼有第二信使和神经递质的功能,又是效应分子,介导和调节多种生理和病理过程〔1,2〕。Stadler等〔3〕于1991年用白介素1(interleukin 1,IL-1)或内毒素诱导软骨细胞合成NO,提供了软骨代谢涉及NO的最早证据。1992年Farrell等〔4〕发现在类风湿关节炎(rheumatoid arthritis,RA)和骨关节炎(osteoarthritis,OA)病人的滑膜液和血清中可检测到大量NO代谢产物亚硝酸盐(nitrite,NO-2),推测NO可能参与这二种疾病关节炎症的病理过程。以后诸多学者〔5,6〕使用NOS抑制剂等工具药对多种关节炎动物模型进行了研究,证实NO是这些关节炎发病过程中的一种重要炎症介质,由此推动了NO与炎症性关节疾病关系的深入研究。本文就NO涉及炎症性关节疾病以及有关药物治疗方面的进展作一综述。
1 NO参与炎症性关节疾病的发病过程
1.1 关节炎病人:RA和OA滑膜液或血清中NO-2含量以及尿中硝酸盐(nitrate,NO-3)或NO-2/NO-3排出量均高于正常人〔4,7~9〕。强的松龙0.5 mg/kg口服,连续2~4周,不但降低RA患者C反应蛋白、血沉、晨僵时间与关节疼痛指数,而且还明显减少尿中NO-3排出。给活动期RA患者甲基强的松龙冲击治疗,1 g/d,连续3天,第4天患者滑膜液中S-亚硝基蛋白(S-nitrosoproteins,S-NP)含量明显减少,且与患者症状、体征以及实验室指标改善呈明显正相关,表明NO可能参与炎症性关节疾病的发病过程。
目录: 1 NO参与炎症性关节疾病的发病过程
2 NO参与炎症关节损伤的作用机制
3 药物对NO产生的调控作用
4
问题与展望
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