乙肝病毒X基因真核表达载体pEGFP-X的构建及其表达

目的：构建pEGFP—X真核表达载体，观察其在肝癌细胞株中的表达。方法：从质粒pcDNA3．1（＋）-X酶切获HBVX基因片段，克隆至pEGFP—N1；用酶切、PCR和测序鉴定pEGFP—X载体；用脂质体法，将重组载体（pEGFP—X）和空载体（pEGFP-N1）瞬时转染肝癌细胞细胞株BEL-7402；分别用RT—PCR、荧光显微镜鉴定HBVX和EGFP基因表达。结果：鉴定证实pEGFP-X载体构建成功；该质粒瞬时转染的BEL-7402有HBVX基因表达，并发绿色荧光。结论：构建的pEGFP—X真核载体能在BEL-7402中表达，绿色荧光蛋白示踪利于表达HBVX基因稳定细胞株的筛选，并为探讨HBVX基因在HCC中的致瘤机理提供实验模型奠定基础。

Construction and expression of eukaryotic expression vector for hepatitis B virus X gene containing EGFP

Objective:To construct eukaryotic expression vector for hepatitis B virus X(HBV X) gene with enhanced green fluorescence protein(EGFP),and confirm its expression in hepatocellular carcinoma(HCC)cell line.Method: HBV X gene was cloned from pcDNA3.1(+)-X by enzyme digestion and inserted to pEGFP-N1.The rector was confirmed by enzyme digestion,PCR assay and sequencing.Then pEGFP-X was transfected to HCC cell line Bel-7402.After transient transfection,expressions of HBV X and EGFP gene were detected by RT-PCR and fluorescence microscope respectively.Results: The results showed that the recombinant plasmid could express HBV X gene efficiently in Bel-7402,which showed green fluorescence.Conclution: The pEGFP-X was constructed and the fused HBV X-EGFP gene was expressed in Bel-7402 successfully.These facilitate the study of the effect of HBV X protein on the development of HCC.