RNA干扰技术抑制人肝癌细胞POLD1基因表达的研究

Inhibition of POLD1 Gene Expression by RNA Interfering in Human Liver Cancer Cells

目的应用RNA干扰技术抑制人肝癌细胞SMMC-7721中POLD1基因的表达,探索该技术干预肝癌的可行性。方法制备4个针对人POLD1基因的shRNA表达质粒,转染SMMC-7721细胞48 h后,荧光定量PCR法检测POLD1基因的表达,CCK-8检测细胞生长情况。结果测序鉴定证实4个shRNA表达质粒构建成功,将其转染SMMC-7721细胞后,NEO-POLD1-1和NEO-POLD1-4表达质粒抑制效果明显,使SMMC-7721细胞的增殖受到抑制,并且使POLD1基因表达在mRNA水平抑制,NEO-POLD1-1相对表达量为(0.1425±0.0205),NEO-POLD1-4相对表达量为(0.209±0.009)。结论针对POLD1基因设计的shRNA在体外有效地抑制了POLD1基因mRNA的表达和肝癌细胞的增殖,且实现RNA干扰具有序列选择性。

Objective To investigate the feasibility of RNA interfering （ RNAi ） on liver cancer by using this technique to inhibit the expression of POLD 1 gene in human liver cancer cells SMMC-7721.Methods Four expression plasmids with shRNAs targeting POLD 1 gene were constructed ,and then the plasmids were transfected to SMMC-7721 for 48 hours.The expression of POLD1 gene was detected by real-time RT-PCR.CCK-8 assay was used to analyze the change of cell proliferation .Results The four expression plasmids were constructed successfully , confirmed by sequencing .After the plasmids were transfected to SMMC-7721 , the cell proliferation was significantly inhibited in NEO-POLD1-1 and NEO-POLD1-4.The mRNA expression of POLD1 gene in NEO-POLD1-1 and NEO-POLD1-4 were significantly inhibited as （0.1425 ±0.0205） and （0.209 ±0.009）.Conclusion shRNAs targeting the POLD1 gene can inhibit the mRNA expression of POLD1 gene and liver cancer cell proliferation in vitro ,and the RNA interfering is sequencing alternative .