人CD38分子基因的克隆及其在真核细胞中的表达

目的：克隆并表达人CD38抗原分子的全长cDNA。方法：采用RT－PCR法，从高表达CD38抗原的Daudi细胞系中克隆出CD38全长cDNA并将其插入pGEM-T载体中，重新设计引物，引入酶切 位点，二次PCR；从重组pGEMT载体上扩增CD38抗原分子的cDNA编码序列，再亚克隆至真核表达载体pcDNA3.1( )，用脂质体法转染COS7细胞。用免疫荧光及A－PAAP方法检测CD38抗原的表达。结果：克隆的CD38抗原的全长cDNA，经酶切鉴定及序列分析表明，其序列与文献报道完全一致。免疫荧光及APAAP方法检测表明，CD38抗原分子在COS7细胞中获得表达。结论：成功构建了CD38真核表达载体，并在COS7细胞中获得表达，对研究CD38分子的功能具有重要的意义。

Cloning and eukaryotic expression of human CD38

Objective:To clone and express the full length cDNA of human CD38. Methods:The full length cDNA of the human CD38 antigen was amplified from total RNA of Daudi cell by RT-PCR, and it was inserted into pGEM-T. The validity on the sequences was confirmed by automatic DNA sequencing. Inserting the valid CD38 gene into pcDNA3.1(+) plasmid to obtain recombinant mammalian expression vector pcDNA3.1(+)/CD38Z; Using lipofectin gene transfer technique system, recombinant expression vector containing CD38 gene was transfected into COS7 cells. The expression of CD38 molecules on the surface of COS7 cells was detected by FACS and immunohistochemical technique. Results:DNA sequencing showed that the cloned full length cDNA sequence was identical with reported. The result of FACS and immunohistochemical technique indicated that CD38 molecules were expressed on the surface of COS7 cells. Conclusion:The full length cDNA of human CD38 is obtained, recombinant mammalian expression vector pcDNA3.1(+)/CD38Z is successfully constructed, and the CD38 molecules is expressed on the surface of COS7 cells,this may facilitate studies on the biochemistry and function of CD38 antigen.