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RNAi重组体抑制白血病K562细胞系中NPM1基因的表达

, PP. 938-941

Keywords: 核仁磷酸蛋白,RNA干扰,白血病,K细胞

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Abstract:

目的构建核仁磷酸蛋白1(nucleophosmin1,NPM1)特异性的RNAi真核表达载体,观察对白血病K562细胞系NPM1表达的抑制作用。方法采用RT-PCR检测白血病细胞系(THP1和K562)和急性髓系白血病(AML)细胞NPM1mRNA水平。设计合成2条针对NPM1基因并具有小发夹结构的DNA序列,经退火形成互补双链,再克隆至载体pGenSil-1中构建含NPM1的RNAi重组体,经酶切及测序鉴定后通过脂质体转染K562细胞,同时设立pGenSil-1转染组和pGenSil-1/neg转染组。采用RT-PCR检测各组转染细胞中NPM1的mRNA水平。结果白血病细胞系和AML细胞均高表达NPM1mRNA。针对人NPM1基因的RNAi重组体构建成功,并能够稳定转染K562细胞,导致白血病细胞NPM1mRNA相对表达量下降64%,而pGenSil-1转染组和pGenSil-1/neg转染组未能下调NPM1表达。结论白血病细胞高表达NPM1基因,其mRNA表达水平能够被靶向NPM1的RNAi重组体特异性地下调。

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