反义Bmi-1对Jurkat细胞的抑制作用

目的观察反义Bmi-1表达质粒在体外对T淋巴细胞白血病Jurkat细胞的生长抑制作用。方法选择Bmi-1基因起始密码子及与锌指结构对应的171bp核苷酸片段,反向连接于pLNCX2质粒上,得到反义Bmi-1表达质粒;通过脂质体转染将质粒导入Jurkat细胞中,以G418进行筛选得到阳性克隆;以MTT法和体外集落形成实验检测反义Bmi-1表达质粒对Jurkat细胞增殖的抑制作用;用流式细胞术分析细胞周期;采用免疫荧光组化法检测反义Bmi-1对Jurkat细胞P16蛋白的上调作用。结果转染反义Bmi-1表达质粒组与对照组(空白对照及空质粒组)相比较,生长速度明显变慢,克隆形成能力明显下降,空白对照组Jurkat细胞集落数为(90.70±9.07)/103细胞,空质粒组Jurkat细胞集落数为(83.30±6.11)/103细胞,转染反义质粒组Jurkat细胞集落数为(56.00±5.56)/103细胞(P<0.01);P16蛋白表达也明显增强。结论反义Bmi-1对Jurkat细胞的体外生长具有明显的抑制作用,并上调了P16蛋白的表达。

Inhibition effect of antisense Bmi-1 on Jurkat cells

OBJECTIVES: To investigate whether antisense Bmi-1 plasmid could inhibit the proliferation of Jurkat cells. METHODS: The antisense plasmid was constructed by PCR amplification of a 171 bp segment spanning Bmi-1 start codon and zinc finger structure and the PCR product was subsequently inserted reversedly to plasmid pLNCX2. The final construct was confirmed through restriction enzyme digestion. G418 was added into the medium after the plamid was successfully introduced into Jurkat cells by using lipofectin-mediated DNA transfection. The proliferation of Jurkat cells were determined by MTT and colony formation assays. Cell cycle was determined by flow cytometry. The p16 expression of Jurkat cells was studied by immunofluorescent histochemistry. RESULTS: The growth rate of antisense Bmi-1 transfected Jurkat cells was significantly lower than that of the controls, and the colony forming capacity of the transfected cells decreased significantly (P < 0.01), the colony numbers being (90.7 +/- 9.07)/10(3) cells, (83.3 +/- 6.11)/10(3) cells and (56.0 +/- 5.56)/10(3) cells for control cells, empty plasmid transfected Jurkat cells and antisense Bmi-1 transfected Jurkat cells, respectively. The percentage of G, phase cells was increased and the p16 expression of antisense Bmi-1 transfected cells was significantly upregulated than that of control cells. CONCLUSION: Antisense Bmi-1 can inhibit the growth and upregulate the expression of p16 of Jurkat cells in vitro.