GW112基因siRNA对人胃癌SGC-7901细胞体外增殖的影响

目的 构建靶向GW112 siRNA逆转录病毒载体并筛选特异高效的RNAi靶点,研究GW112基因沉默后对胃癌SGC-7901细胞体外增殖的影响.方法 应用逆转录病毒载体psilencer 5.1-H1 Retro 构建针对GW112基因3个不同靶点的RNAi干扰载体-pSiRNA-GW112 (pSi405-GW112, pSi1066-GW112, pSi1480-GW112),将脂质体法转染PT67细胞包装的病毒感染SGC-7901细胞,嘌呤霉素筛选稳定克隆,RT-PCR鉴定病毒整合,Real-time PCR筛选高效抑制靶点,CCK-8法检测对细胞体外增殖的影响.Western blot检测增殖细胞核抗原(PCNA)的表达.结果 测序结果证实各干扰靶点的重组逆转录病毒载体pSiRNA-GW112构建正确.RT-PCR结果显示除亲本细胞外,经各靶点病毒上清感染的细胞均能扩增出510 bp的Puro抗性基因片段.Real-Time PCR分析表明与SGC-7901亲本细胞组相比,7901-Si405,7901-Si1066及7901-Si1480组GW112的转录水平分别只有SGC-7901组的(15.50±0.01)%,(32.40±0.01)% 与(57.00±0.02)%.而7901-Sc组GW112表达基本无变化.Si405, Si1066与 Si1480 靶点的抑制率分别为84.5%,67.6%及43.0%.沉默GW112后导致SGC-7901细胞体外增殖能力显著抑制(P<0.05),并伴随PCNA蛋白表达下调.结论 构建的重组逆转录病毒载体pSiRNA-GW112能显著抑制SGC-7901细胞的体外增殖能力,且这种增殖抑制与下调的PCNA表达有关.

Inhibitory effect of silencing GW112 siRNA gene on proliferation of human gastric SGC-7901 cell line

Objective To construct the small interfering RNA (siRNA) retrovirus vector targeting GW112 with a high specificity and to study the effect of silencing GW112 gene on the proliferation of gastric SGC-7901 cells.Methods Three recombinant RNAi interference vectors were constructed according to different GW112 targeting points (pSi405-GW112,pSi1066-GW112,pSi1480-GW112) using a retrovirus expression vector,psilencer 5.1-H1 Retro.SGC-7901 cells were infected with a packaged PT67 cells transfected with liposome.St...