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目的 探讨乌司他丁(ulinastatin,LTI)对脓毒症大鼠肠道潘氏细胞防御素5(rat defemin-5,RD-5)mRNA表达的影响.方法 实验在中山大学医学院药理实验室完成.60只SD大鼠随机分为对照组、脓毒症组、预处理组及治疗组(n=15).后三组采用盲肠结扎穿孔术(cecal ligation andpuncture,CLP)制作大鼠脓毒症模型.预处理组在CLP前2h经尾静脉注射UTI 25 000 U/kg,治疗组在CLP后2 h经尾静脉注射UTI 50 000 U/kg.于模犁建立后12 h取回肠黏膜,观察其病理改变并以RT-PCR法检测RD-5 mRNA的表达.数据以SPSS 13.0统计软件处理,采用方差分析及LSD-t检验进行数据分析.结果 RD-5 mRNA在脓毒症组显著下降(P<0.05),预处理组及治疗组较脓毒症组有明显升高(P<0.05),预处理组较治疗组明显升高(P<0.05).结论 脓毒症大鼠RD-5mRNA表达明显下降,乌司他丁可显著上调其表达,保护肠黏膜,预防用药较治疗给药可能更有意义.“,”Objective To investigate the effeets of ulimstatin on expression of intestinal defemin-5 mRNAin the rat model of sepsis.Method The experiment was performed in pharmaco-laboratory of medical college,Sun Yat-Sen University.sixty Sprague-Dawley rals were randomly divided into control,sepsis,pretreated andtreated groups(n=15).Semis was induced in the mts of latter three groups by cecal lifo.and puncture(CLP).The rats of pretreated group received 25 000 U/kg ulinastatin 2 hours before operation and the rats of uli-nastatin treated groups received 50 000 U/kg ulinastatin 2 hours after operation.Some pieces of ileum mucosa weretaken 12 h after CLP.Tge pathological changes were observed and the expression of RD-5 mRNA was detectedwith RT-PCR.All data were managed by SPSS 13.0 software and arIaIyzed by using One-way ANOVA and LSD-ttest.Results The expression of RD-5 mRNA in the rats of sepsis group significantly decreased compared to col-trol(P<0.05).The expression of RD-5 mRNA of pretreated and treated groups sigificantly inereased comparedto sepsis group(P<0.05);pretreated groups had more increased expression of,RD-5 mRNA compared to treatedgroups(P<0.05).Conclusions The expression of intestinal RD-5 mRNA significantly decreases in sepsis,which could be improved by the treatment of ulinadtatin leading to intestinal mucosal protection of the siqnifleant.The pretreatment may be more effective than the theTapeatic treatment in the rat model of sepsis.