ADAM17-shRNA在缺氧条件下对人乳腺癌细胞MCF-7增殖的影响

目的：研究在缺氧环境下靶向针对解聚素-金属蛋白酶17（ADAM17）的短发夹状 RNA（shRNA）对人乳腺癌 MCF-7细胞增殖的影响。方法针对 ADAM17设计4个特异性的 ADAM17-shRNA，经电穿孔法转染 MCF-7细胞。缺氧条件下培养细胞。试验分为：对照组（空白磷酸盐缓冲液）、无义序列组（转染无义序列 ADAM17-shRNA）和 shRNA 转染组（转染 ADAM17-shRNA，选择沉默 ADAM17基因效率最高的 shRNA 用于后续试验）。分别采用实时荧光定量 PCR、iCELLigence、流式细胞仪检测细胞 ADAM17 mRNA 的表达水平、细胞增殖活性和细胞周期变化。结果4个 shRNA 转染组对 MCF-7细胞的 ADAM17基因表达均有沉默作用，与对照组及无义序列组相比，差异具有统计学意义（P ＜0．05），尤以 shRNA1219抑制率最高（F ＝5．11， P ＜0．01）。shRNA 转染组的细胞生长速度和增殖活性较对照组和无义序列组显著降低，差异有统计学意义（P ＜0．05）。shRNA转染组的绝大多数细胞停留在 G0／G1期（73．35±2．45），与对照组（62．56±2．35）、无义序列组（62．68±1．20）相比较，差异有统计学意义（P ＜0．05），细胞周期进展明显延缓。结论 ADAM17-shRNA 在缺氧条件下抑制乳腺癌细胞 MCF-7的增殖。

Effect of ADAM17-shRNA on proliferation of human breast cancer cell line MCF-7 in hypoxia

Objective To investigate the effects of shRNA targeting a disintegrin and metalloproteinases 17(ADAM17)on the proliferation of human breast cancer MCF-7 cells in hypoxia environment.Methods The four specific ADAM17-shRNA se-quences aiming at ADAM17 were designed,transfected into MCF-7 cells by electroporation,and cultured in hypoxia environment. The experiment was divided into the control group (blank phosphate buffer solution,PBS),nonsense sequence group (transfected with ADAM17-shNC)and shRNA transfection group (transfected with ADAM17-shRNA,the highest silencing efficiency of shR-NA was selected for following experiments).Real-time PCR was used to detect the expression of ADAM17 mRNA.The prolifera-tion ability and cell cycle change of MCF-7 cells were detected by iCELLigence and flow cytometry (FCM),respectively.Results Compared with control group and nonsense sequence group,the four ADAM17-shRNA transfection groups all had the silence effect on ADAM17 gene expression (P <0.05 ),the difference was statistically significant(P <0.05 ),particularly shRNA1219 had the highest inhibitory rate (F =5.11,P <0.01 ).The cellular proliferation ability and cell growth speed in the shRNA transfection group were significantly decreased compared with the control group and nonsense sequence group (P <0.05).Most cells of shRNA transfection group remained in the G0/G1 phase (73.35 ± 2.45 ),which in the control group and nonsense sequence group was (62.56±2.35)and (62.68 ±1.20)respectively,the difference was statistically significant(P <0.05).The cell cycle progression was significantly delayed.Conclusion ADAM17-shRNA inhibits the proliferation of MCF-7 cells under hypoxic environment.