RNA干扰对人环氧化酶-2合成以及对类风湿关节炎滑膜成纤维细胞生物学活性的影响

目的分析siRNA对前列腺素E2（PGE2）、白介素-1β（IL-1β）、IL-6、肿瘤坏死因子（TNF—α）和血管内皮生长因子（VEGF）合成的影响。方法设计4条（1^#-4^#）环氧化酶-2（hCOX-2）mRNA的小分子干扰RNA（siRNA），设立空白阴性（CTL）和1条随机序列（NC）对照。应用LipofectAMINE 2000将siRNA转染入滑膜成纤维细胞（RASF），4h后，再加入100nmol/L的佛波酯。应用RT-PCR和Western印迹分别检测hCOX-2 mRNA和蛋白表达水平。采用ELISA法检测各组上清液中致炎因子水平。结果转染48h后，NC、1^#-4^#siRNA组与CTL组mRNA条带吸光度比值分别为0．72、0，3、0．25、0．4、0．04。转染36和48h后，各组与CTL组hCOX-2蛋白吸光度比值分别为1．04、0、52、0．39、0．9、0和1．05、0．52、0．51、0．9、0．15；4^# siRNA组上清液PGE2、IL-1β、TNF—α、IL-6和VEGF水平较其他各组为低，且与其他处理组相比死亡细胞率差异无统计学意义（P均〉0．05）。结论4^#iRNA组能有效抑制COX-2mRNA和蛋白表达，其上清液中致炎因子水平最低，死亡细胞较苴他各组无明显增加．

Effects of RNAi on cyclooxygenase-2 expression and biologic activity of human rheumatoid arthritis synovial fibroblasts

OBJECTIVE: To screen highly efficient small interfering RNA (siRNA) targeting human cyclooxygenase-2 (hCOX-2) mRNA on human rheumatoid arthritis synovial fibroblasts (RASF) and to further study the impact there on prostaglandin E2 (PGE2) and cytokines, such as interleukin-1beta (IL-1beta), interleukin-6 (IL-6), timorous necrosis factor-alpha (TNF-alpha), and vascular endothelial growth factor (VEGF). METHODS: 4 lines of COX-2 mRNA siRNA (1(#) - 4(#) siRNA) were designed and transfected into the fibroblasts from the synovial membrane of a patient with rheumatoid arthritis (RASF). Phorbol ester was added 4 hours later. A scrambled line (NC) group and a blank control (CTL) group were used. RT-PCR and Western blot ting were used to detect the mRNA and protein expression of COX-2 36 and 48 hours after transfection. The levels of PGE2, IL-1beta, IL-6, TNF-alpha, and VEGF were measured by ELISA. RESULTS: RT-PCR showed that the absorbance ratios of the positively interfering groups, NC, and 1(#) - 3(#) siRNA groups, to CTL group were 0.72, 0.3, 0.25, 0.4, and 0.04 respectively. The ratios of the positively interfering groups to CTL group were 1.04, 0.52, 0.39, 0.9, and 36 h after transfection and 1.05, 0.52, 0.51, 0.9, and 0.15 respectively 48 h after transfection. The levels of PGE2, IL-1beta, IL-6, TNF-alpha, and VEGF in the culture supernatant were lower in the 4(#) siRNA group than in other groups 24, 36, and 48 h after transfection. The death rates of RASF of all trial groups were within the range of 9% - 11% and there were not statistically significant differences between the CTL group and the siRNA groups or between the 4(#) siRNA and other siRNA groups. CONCLUSION: 4(#) siRNA effectively inhibits the expression of COX-2 mRNA and protein the level of PGE2, IL-1beta, IL-6, TNF-alpha, and VEGF in the clear supernatant of the 4(#) group is lowest.