人血凝素样氧化型低密度脂蛋白受体1双顺反子表达载体的构建及其在293T细胞中的表达
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(大连大学生命科学与技术学院 糖脂代谢重点实验室,辽宁省大连市 116622)

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于田田,硕士研究生,研究方向为重组蛋白beta2-GPI DV 通过抑制ox-LDL与LOX-1结合治疗动脉粥样硬化及继发血栓疾病,E-mail为yixin2008wenxin@163.com。李敬达与于田田对本文有相同贡献。

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国家自然科学基金资助项目(81202536);辽宁省大学生创新训练项目(201511258040)


Establishment of human lectin-like oxidized low density lipoprotein receptor-1 bicistronic expression vector and its expression in 293T cells
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College of Life Science and Technology, Dalian University & Key Laboratory of Carbohydrate and Lipid Metabolism Research, Dalian, Liaoning 116622, China)

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    摘要:

    目的 尝试构建人血凝素样氧化型低密度脂蛋白受体1(LOX-1)基因双顺反子表达载体并检测其在293T细胞中的表达情况和生物学活性,为深入探讨LOX-1在动脉粥样硬化中的作用和以LOX-1为靶点建立干预机制治疗动脉粥样硬化奠定基础。方法 首先根据Primer5.0软件设计引物,采用聚合酶链反应法以LOX-1 cDNA片段为模板扩增LOX-1基因完整编码区,克隆至T载体,经测序成功后亚克隆到双顺反子真核表达载体pIRES2-AcGFP1-Nuc。利用脂质体转染法将双顺反子重组表达质粒转染至293T细胞,倒置荧光显微镜检测质粒转染情况。采用逆转录聚合酶链反应和免疫印迹法鉴定LOX-1基因在核酸和蛋白水平的表达,采用激光共聚焦检测LOX-1基因在293T细胞膜上的表达,激光共聚焦和流式细胞术检测表达在293T细胞膜上的LOX-1结合氧化型低密度脂蛋白(ox-LDL)的生物学活性。结果 成功构建pIRES2-LOX-1双顺反子重组表达载体,将其转染293T细胞后,观察到绿色荧光蛋白基因的表达,初步表明LOX-1基因转染至293T细胞。进一步分子水平鉴定结果表明LOX-1基因在293T细胞核酸和蛋白水平均得到表达,激光共聚焦结果证明LOX-1基因在293T细胞膜上表达。最后激光共聚焦和流式细胞术结果证实表达在293T细胞膜上的人LOX-1基因可以结合氧化型低密度脂蛋白。结论 成功构建人LOX-1基因双顺反子表达载体,在此基础上证明其在293T细胞膜上得到表达,并且具有结合ox-LDL的生物学活性,为后续体外研究其在动脉粥样硬化中的作用以及以此为靶点建立干预机制奠定了基础。

    Abstract:

    Aim Trying to establish a lectin-like oxidized low density lipoprotein receptor-1 (LOX-1) bicistronic gene expression vector and detect its expression and function in 293T cell, to explore the role of LOX-1 in atherosclerosis and lay a foundation for establishing intervention mechanism of LOX-1 targets. Methods First human LOX-1 gene was obtained from human cDNA by PCR and cloned into T plasmid. After sequencing, recombinant T plasmid was subcloned into bicistronic eukaryotic expression plasmid pIRES2 AcGFP1-Nuc. Next the bicistronic recombinant expression plasmid was transfected into 293T cells by liposome. Plasmid transfection efficiency was detected by inverted fluorescence microscope. Then the expression of exogenous human LOX-1 gene and protein in 293T cells was detected by RT-PCR and Western blot. The expression of human LOX-1 in 293T cells membrane was detected by confocal laser. Finally LOX-1 functions of binding with ox-LDL in 293T cell membrane was detected by confocal laser and flow cytometry. Results The pIRES2-LOX-1 bicistronic recombinant plasmid was constructed successfully. After transfection, green fluorescent protein was detected and the abundant LOX-1 mRNA and protein were expressed in the transfected cells, moreover human LOX-1 were expressed in the 293T cells membrane and could bind with ox-LDL. Conclusion We have successfully established a LOX-1 gene bicistronic expression vector and on the basis we testified human LOX-1 expressed in 293T cells membrane and could bind with ox-LDL, which layed a foundation for further study of its effect in atherosclerosis and establishing intervention mechanism of LOX-1 targets.

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于田田,李敬达,刘庆平,王仁军,乔辉,陈玉华,李明英,于柯楠,迟彦.人血凝素样氧化型低密度脂蛋白受体1双顺反子表达载体的构建及其在293T细胞中的表达[J].中国动脉硬化杂志,2017,25(1):25~31.

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  • 收稿日期:2016-03-17
  • 最后修改日期:2016-04-23
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  • 在线发布日期: 2017-02-08