摘要
目的:构建含有人CXCR3基因的重组逆转录病毒载体,获得稳定表达人CXCR3分子的基因转染细胞株L929-CXCR3,研究CXCR3与其配体Mig、IP-10及I-TAC相互作用引起的L929-CXCR3的迁移效应。方法:TRIzol一步法从经PHA和IL-2活化的人PBMC中抽提总RNA,RT-PCR扩增人CXCR3全长基因,装入逆转录病毒载体pEGZ-term,与两辅助病毒载体脂质体法共转染包装细胞293T,收集培养上清感染L929细胞,500μg/mlzeocin加压筛选获得稳定表达人CXCR3分子的基因转染细胞株L929-CXCR3。采用流式细胞术和RT-PCR分别从蛋白及基因水平对CXCR3的表达进行鉴定。Transwell分析L929-CXCR3细胞在Mig、IP-10及I-TAC作用下的迁移率。结果:构建了含人CXCR3基因的重组逆转录病毒载体,建立了人CXCR3基因转染细胞株L929-CXCR3,其膜表面CXCR3分子的阳性表达率为98.4%;趋化L929-CXCR3发生迁移的最小配体浓度分别为Mig10ng/ml、IP-105ng/ml及I-TAC1ng/ml,相应迁移率分别为2.46%、2.34%及2.24%。结论:L929-CXCR3细胞株的建立为研究CXCR3信号转导与生物学功能及制备相应的单克隆抗体奠定了基础。
Objective:To construct recombinant human CXCR3 gene retroviral vector and obtain L929-CXCR3 gene transfected cell line for stably expressing human CXCR3.Further conduct study on L929-CXCR3 migratory effect resulted from interaction by CXCR3 and its ligands Mig,IP-10 and I-TAC.Methods:Total RNA was extracted from activated human peripheral blood mononuclear cells by PHA and IL-2 with TRIzol.Human CXCR3 gene of full length was amplified by RT-PCR,and then it was inserted into retrovirus vector pEGZ-term.The recombinant vector together with its helper virus vector were co-transfected into package cell 293T with LipofectamineTM 2000.The supernatant of 293T was collected for infecting L929 cells,and cell clones stably expressing human CXCR3 molecule were screened by zeocin(500 μg/ml).Used FCM and RT-PCR to verify expression of CXCR3 at protein level and gene level,respectively.Migratory ability of L929-CXCR3 interacted with its ligands was studied by transwell system.Results:Had constructed recombinant human CXCR3 gene retroviral vector and obtained L929-CXCR3 gene-transfected cell line.Positive expression rate of CXCR3 on membrane was 98.4%,and the cells could directly migrate when induced by its ligands.For 10 ng/ml Mig,5 ng/ml IP-10 and 1 ng/ml I-TAC,the migration rates was 2.46%,2.34% and 2.24% respectively.Conclusion:Construction of L929-CXCR3 cell line has laid a good foundation on research of biologic characteristics of CXCR3 signal path and preparation of CXCR3 monoclonal antibody.
出处
《中国免疫学杂志》
CAS
CSCD
北大核心
2010年第5期387-391,共5页
Chinese Journal of Immunology
基金
科技部科技重大专项资助(No.2009ZX09103-705)