重组pEGFP-C1-CXCL1真核表达载体构建及其对内质网应激下人肝癌细胞HepG2的增殖作用

摘要

目的 构建pEGFP-C1-CXCL1真核表达载体,研究过表达CXCL1对内质网应激(ERS)下肝癌细胞增殖作用.方法 以HepG2细胞的cDNA文库为模板,通过PCR扩增CXCL1编码序列,并将其插入pEGFP-C1空载体,构建pEGFP-C1-CXCL1真核表达载体,随后将其瞬时转染到293 T细胞中,通过荧光显微镜和蛋白质免疫印迹法检测CXCL1在真核细胞中的表达情况,将pEGFP-C1-CXCL1转染至HepG2细胞中,CCK8检测CXCL1对TM诱导下的ERS肿瘤增殖的抑制作用.结果 菌液PCR和测序结果均证实得到pEGFP-C1-CXCL1真核表达载体,其转染293T细胞后,在荧光显微镜下可观察到绿色荧光,免疫印迹表明CXCL1在293T细胞中表达,CCK8实验表明,ERS条件下肿瘤的增殖受到抑制,而过表达的CXCL1可降低ERS下的HepG2细胞的增殖抑制.结论 成功构建了真核表达质粒pEGFP-C1-CXCL1,并在人胚肾293T细胞中瞬时表达成功,过表达的CXCL1可有效降低由ERS造成的肝癌细胞的增殖抑制.%Objective To construct the pEGFP-C1-CXCL1 eukaryotic expression vector and to investigate the effect of CXCL1 on the proliferation of HepG2 cells under endoplasmic reticulum stress ( ERS).Methods Fragments of CXCL1 were obtained from the cDNA library of HepG2 cells before CXCL1 was cloned into a pEGFP-C1 vector for a recombinant plasmid pEGFP-C1-CXCL1 which was screened and identified by PCR and sequence alignment .Then,the recombinant plas-mid of pEGFP-C1-CXCL1 was transfected into human 293 T cell line and the expression of CXCL 1 was detected by fluores-cence microscopy and Western blotting.pEGFP-C1-CXCL1was furhter transfected into HepG2 cells, and CCK8 was used to detect the inhibitory effect of CXCL1 on tumor proliferation induced by TM in hepatocellular carcinoma .Results pEGFP-C1-CXCL1 was vertified by sequencing analysis .Fluorescence microscopy showed that pEGFP-C1-CXCL1 was transfected into 293T.CXCL1 expression was detected by Western blotting .CCK8 showed that TM inhibited tumor proliferation , while overexpression of CXCL1 decreased the inhabitory rate on cell proliferation of HepG 2 cells under ER stress compared to pEGFP-C1 group and the control group .Conclusion A recombinant pEGFP-C1-CXCL1 plasmid is successfully constructed that can be expressed stably in human 293T cells.Overexpression of CXCL1 can effectively reduce the inhabitory rate of HCC cells induced by the ER stress.