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  • Title: [Cloning of human NKG2D gene and its expression in CHO cells].
    Author: Xu XQ, Chen XM, Zhang C, You L, Zhao CS, Wang JF, Zhang JH.
    Journal: Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi; 2006 Jul; 22(4):447-9. PubMed ID: 16806005.
    Abstract:
    AIM: To construct a recombinant eukaryotic expression vector of human NK cell receptor NKG2D, and express the recombinant human NKG2D in CHO cells. METHODS: A NKG2D gene fragment, with a length of about 650 bp, was amplified from the NK-92 cell line by RT-PCR and was cloned to plasmid pGEM-T Easy. Then the cloned DNA fragment was sequenced. The recombinant plasmid pGEM-T Easy/NKG2D was digested with EcoR I and BamH I, and then NKG2D fragment was isolated and inserted into the corresponding restriction site on eukaryotic expression vector pEGFP-N1. The Lipofectin was used to transfect the recombinant eukaryotic expression plasmid in CHO cells. The expression level of NKG2D gene in transfected CHO cells was detected by fluorescence microscope, RT-PCR, Western blot and immunohistochemical staining. RESULTS: The length of cDNA fragment amplified by RT-PCR was consistent with that of NKG2D. DNA sequencing of pGEM-T Easy/NKG2D revealed that the cloned DNA sequence was identical to that of reported NKG2D. Green fluorescence was seen in transfected CHO cells by fluorescence microscope. Human NKG2D mRNA was highly expressed in transfected CHO cells. Western blot and Immunohistochemical staining detection showed that NKG2D was expressed in transfected cells. CONCLUSION: A recombinant eukaryotic expression vector of human NKG2D can be constructed and it can be expressed successfully in CHO cells.
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