Tet-on慢病毒系统表达弓形虫ROP18的研究  

Overexpression of Toxoplasam gondii ROP18 by Tet-on Lentivirus Expression System

作　　者：王晓[1] 朱君[1] 吴亮[1] 吴腊梅[1] 刘原[1] 苏丹华[1] 丁宁[1] 赵康容 姜旭淦[1] 陈盛霞[1] 曹建平[2] 

机构地区：[1]江苏大学医学院,镇江212013 [2]中国疾病预防控制中心寄生虫病预防控制所,卫生部寄生虫病原与媒介生物学重点实验室,世界卫生组织疟疾、血吸虫病和丝虫病合作中心,上海200025

出　　处：《中国寄生虫学与寄生虫病杂志》2015年第1期25-28,共4页Chinese Journal of Parasitology and Parasitic Diseases

基　　金：国家自然科学青年基金(No.81301453);卫生部寄生虫病原与媒介生物学重点实验室开放课题(No.WSBKTKT201302);中国博士后科学基金(No.2014M561598);江苏省博士后科研资助计划(No.1402171C);江苏大学高级人才启动基金(No.13JDG023;13JDG127)~~

摘　　要：目的用Tet-on慢病毒载体系统构建稳定表达弓形虫棒状体蛋白18(ROP18)的293T细胞株。方法PCR扩增ROP18基因序列插入慢病毒载体p LVCT-t TR-KRAB中,构建带有ROP18活性片段的慢病毒载体p LVCT-t TRKRAB-ROP18。经鉴定后将该重组载体(6μg)与辅助质粒ps PAX2(4μg)和p MD2.G(2μg)共同转染293T细胞,荧光显微镜下观察细胞荧光。于转染后48和72 h收集含有慢病毒颗粒上清液,感染293T细胞。以1μg/ml强力霉素(DOX)诱导293T细胞表达ROP18,荧光显微镜下观察细胞荧光,RT-PCR法检测293T细胞中的ROP18表达情况。结果 PCR扩增rop18片段为960 bp,与预期大小一致。经PCR和酶切鉴定重组慢病素载体构建成功。转染48 h后,293T细胞于荧光显微镜下可见绿色荧光。经DOX诱导24 h即可观察到293T细胞中明亮绿色荧光。RT-PCR检测结果显示,293T细胞ROP18可产生960 bp特异条带,与预期结果一致。结论采用Tet-on慢病毒载体系统构建了稳定表达弓形虫ROP18的293T细胞株。Objective To construct a 293 T mutant cell line over-expressing ROP18 of Toxoplasma gondii by Teton lentivirus expression system. Methods Rop18 gene of T. gondii was amplified by PCR, and inserted into a lentiviral vector p LVCT-t TR-KRAB. The recombinant plasmid p LVCT-t TR-KRAB-ROP18（6 μg） and 293 T human embryonic kidney cells were co-transfected with ps PAX2（4 μg） and p MD2.G（2 μg） for the packaging. The result of cotransfection was evaluated by fluorescence microscopy. At 48 h and 72 h after co-transfection, the supernatant of the packaging lentivirus was collected for the 293 T cell infection. The doxycycline（DOX） was added into the medium to induce the ROP18 expression in 293 T cells. The ROP18 fusion expression was observed under fluorescence microscope and detected by RT-PCR after induction. Results PCR product of the gene fragment encoding ROP18 was 960 bp. The recombinant plasmid p LVCT-t TR-KRAB-ROP18 was identified by PCR and restriction enzyme digestion. Green fluorescence was observed in 293 T cells at 48 h post-transfection. Bright green fluorescence was observed in 293 T cells at 24 h after DOX induction. RT-PCR results showed that a 960 bp specific band（ROP18 gene） was detectable in 293 T cells. Conclusion 293 T cell line stably expressing ROP18 is established with Tet-on lentivirus expression system.

关 键 词：刚地弓形虫 棒状体蛋白18 慢病毒 四环素诱导调控表达系统 

分 类 号：R382.5[医药卫生—医学寄生虫学]