人LIGHT基因的克隆及其在293T细胞中的表达

目的克隆人LIGHT分子的全长cDNA,构建重组真核表达质粒pCI-neo-LIGHT并在293T细胞上获得稳定表达.方法从人T细胞cDNA文库中用PCR技术克隆人LIGHT全长cDNA,装入T-Easy载体,测序证实后,将LIGHT cDNA装入质粒pCl-neo中构建真核表达载体.用电穿孔法转染293T细胞,经G418筛选后,用流式细胞仪检测LIGHT分子的表达.结果测序证实克隆的LIGHT全长cDNA阅读框正确完整,酶切证实LIGHT-pCI-neo中LIGHT插入方向正确.转染的293T细胞经G418筛选3个月后,流式细胞仪检测有78.69%的细胞表达人LIGHT分子.结论成功克隆LIGHT基因并获得稳定表达膜型LIGHT分子的293T细胞系.

Cloning of human LIGHT gene and expression of the cloned molecule on 293T cells

Objective To clone the full length cDNA of human LIGHT and to construct the recombinant eukaryotic expression plasmid pCI neo LIGHT for the stable expression on 293T cells. Methods Human LIGHT cDNA was cloned from a normal human activated T cell cDNA library phAD.CAD by PCR. After sequencing, LIGHT cDNA was inserted into plasmid pCI neo for the construction of the eukaryotic expression. The recombinant was transfected into 293T cells by electroporation. The expression of LIGHT on the surface of 293T cells was detected by flow cytometry after screening with G418. Results Sequencing confirmed that ORF of LIGHT gene was intact and right. Restrictive enzyme digestion proved that LIGHT gene was inserted into the recombinant plasmid of LIGHT pCI neo correctly. FACS analysis revealed that about 78.69% 293T cells expressed LIGHT protein on the cell surfaces at 3 months after screening with G418. Conclusion LIGHT gene has been cloned successfully, and a 293T cell line expressing LIGHT protein on its membrane surface has been obtained.