体外导入IL-2R反义RNA表达质粒对小鼠脾细胞活化增殖的影响

Effects of IL-2R antisense RNA expression plasmids transfection on the proliferation of mouse splenocytes in vitro

目的 观察导入白细胞介素 2受体 (IL 2R)反义RNA真核表达质粒对体外培养的小鼠脾细胞活化增殖的影响及其机制的探讨。方法 用粘附辅助脂质体法把IL 2R反义RNA真核表达质粒转染脾细胞 ,用丝裂原刺激脾细胞活化增殖 ,MTT法检测细胞生长情况。狭线杂交法检测IL 2RmRNA的表达水平 ,流式细胞仪检测IL 2R的蛋白表达水平。结果 转染各重组质粒后 ,脾细胞的生长增殖受到明显抑制 ,且 pcAnti mIL 2Rαβ与 pciAnti mIL 2Rαβ组抑制率较 pcAnti mIL 2Rα及pcAnti mIL 2Rβ组的大 ,pcAnti mIL 2Rα组抑制率较pcAnti mIL 2Rβ的大。转染各重组质粒对NIH3T3细胞生长增殖无影响。转染各重组质粒后IL 2RmRNA及蛋白表达水平明显降低。结论 IL 2R反义RNA能有效抑制体外培养的小鼠脾细胞的生长 ,IL 2Rαβ融合基因反义RNA较α、β单基因反义RNA的抑制率高 ,IL 2Rα反义RNA较 β反义RNA抑制率高。初步推断 ,IL 2R反义RNA抑制细胞生长的作用是特异的 ,只针对功能性表达IL 2R的细胞。反义RNA封闭IL

AIM To investigate the effects of tranfection of IL 2R antisense RNA expression plasmids on mouse spleen cells' proliferation in vitro and its possible mechanism. METHODS Spleen cells were transfected with IL 2R antisense RNA eukaryotic expression plasmids using adhesion assisted lipofection method, and then the spleen cells were stimulated by mitogen. Cells' proliferation was tested by tetrazolium salt (MTT) method. IL 2R mRNA and protein expression level were measured by slot blot hybridization assay and flow cytometry method respectively. RESULTS The proliferation of spleen cells was inhibited obviously after transfecting with recombinant plasmids. The inhibitory rate of pcAnti mIL 2Rαβ and pciAnti mIL 2Rαβ transfected group was higher than that of pcAnti mIL 2Rα and pcAnti mIL 2Rβ transfected group; the inhibitory rate of pcAnti mIL 2Rα tranfected group was higher than that of pcAnti mIL 2Rβ tranfected group. No inhibitory effect on the growth of NIH3T3 cells was observed when they were transfected with recombinant plasmids. IL 2R mRNA and protein expression level were decreased in spleen cells after transfection of recombinant plasmids. CONCLUSION IL 2R antisense RNA can efficiently inhibit the proliferation of mouse spleen cells in vitro. IL 2Rαβ chimeric antisense RNA showed higher inhibitory rate than α or β antisense RNA. IL 2Rα antisense RNA was more effective than β antisense RNA. It can be concluded preliminarily that the inhibitory effect of IL 2R antisense RNA was exclusively on the growth of cells functionally expressing IL 2R. The inhibitory effect on the spleen cells proliferation was likely due to the blocking of IL 2R expression by antisense RNA.