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GW112基因siRNA对人胃癌SGC-7901细胞体外增殖的影响

, PP. 1379-1382

Keywords: GW基因,RNA干扰,逆转录病毒,胃癌

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Abstract:

目的构建靶向GW112siRNA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psilencer5.1-H1Retro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-timePCR筛选高效抑制靶点,CCK-8法检测对细胞体外增殖的影响。Westernblot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510bp的Puro抗性基因片段。Real-TimePCR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。

References

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