Survivin-siRNA对前列腺癌PC-3M细胞增殖的抑制作用

目的：探讨survivin-siRNA对前列腺癌细胞株PC-3M的增殖抑制作用。 方法:构建两个针对survivin siRNA表达载体，与脂质体和空质粒两个对照组一起分别转染前列腺癌PC-3M细胞后，利用半定量RT-PCR和Western blotting分别检测细胞survivin mRNA及蛋白表达水平，MTT法测定细胞的增殖能力，流式细胞术检测细胞周期和凋亡。 结果:转染72 h后，两个实验组细胞的survivin mRNA水平是脂质体组的48%±6% (n=3)和30%±5%(n=3)，蛋白表达水平是脂质体组的38%±4%（n=3）和36%±4%（n=3）。MTT检测实验组细胞的生长速度分别是脂质体组的44.20%±2.08%(n=3)和39.20%±1.93%（n=3），流式细胞术发现实验组G1期细胞比例明显高于两个对照组，而G2期和S期细胞比例减少，细胞出现凋亡。 结论:利用survivin-siRNA可明显抑制前列腺癌PC-3M细胞的增殖，细胞受阻于G1期, 诱导细胞凋亡，为进一步进行动物体内研究奠定了基础。

Knockdown of survivin expression using siRNA inhibits the growth of PC-3M cells

AIM: To study the inhibitory effects of survivin siRNAs on the growth of PC-3M cells. METHODS: Two pairs of DNA template coding siRNA against survivin were synthesized to construct two recombinant plasmids, pSi-sur1 and pSi-sur2. The two recombinants and the two controls, lipofectin and vacant plasmid were transfected into PC-3M cells. The expressions of survivin mRNA and protein were detected respectively by RT-PCR and Western blotting. Proliferation abilities were measured by MTT, and the cell cycle and apoptosis were assayed by FCM. RESULTS: After 72 h of transfection, the level of cell survivin mRNA in the two siRNA groups was 48%±6% (n=3) and 30%±5% (n=3) of that in lipofectin group, and expression of survivin protein were 38%±4% (n=3) and 36%±4% (n=3) respectively of that in lipofectin control. The proliferation rate of cells in pSi-sur1 and pSi-sur2 groups was also inhibited according to MTT, about 44.20%±2.08% (n=3) and 39.20%±1.93% (n=3) of that in lipofectin group. Cell numbers of G1 phase in two siRNA groups were significantly higher than that in two controls, while cells of G2 phase and S phase were much lower. Cell apoptosis was found in both siRNA groups. CONCLUSION: The two survivin siRNA significantly inhibit the expression of survivin in mRNA and protein levels, arrest the cell cycle in G1 phase, and suppress the growth of PC-3M cells and induce apoptosis in vitro.