title: [Cloning of human CD45 gene and its expression in Hela cells].
abstract: OBJECTIVE
  To clone human CD45 gene PTPRC and establish Hela cells overexpressing recombinant human CD45 protein.
  
  
  METHODS
  The intact cDNA encoding human CD45 amplified using RT-PCR from the total RNA extracted from peripheral blood mononuclear cells (PBMCs) of a healthy donor was cloned into pMD-18T vector. The CD45 cDNA fragment amplified from the pMD-18T-CD45 by PCR was inserted to the coding region of the PcDNA3.1-3xflag vector, and the resultant recombinant expression vector PcDNA3.1-3xflag-CD45 was transfected into Hela cells. The expression of CD45 in Hela cells was detected by flow cytometry and Western blotting, and the phosphastase activity of CD45 was quantified using an alkaline phosphatase assay kit.
  
  
  RESULTS
  The cDNA fragment of about 3 900 bp was amplified from human PBMCs and cloned into pMD-18T vector. The recombinant expression vector PcDNA3.1-3xflag-CD45 was constructed, whose restriction maps and sequence were consistent with those expected. The expression of CD45 in transfected Hela cells was detected by flow cytometry and Western blotting, and the expressed recombinant CD45 protein in Hela cells showed a phosphastase activity.
  
  
  CONCLUSIONS
  The cDNA of human CD45 was successfully cloned and effectively expressed in Hela cells, which provides a basis for further exploration of the functions of CD45.
authors.affiliation: Department of Immunology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China.E-mail: 164757254 @qq.com.
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Tianyu
authors.initials: T
authors.lastname: Xu
authors.forename: Lulin
authors.initials: L
authors.lastname: Wu
authors.forename: Liyun
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiao
authors.initials: X
authors.lastname: Lu
authors.forename: Daming
authors.initials: D
authors.lastname: Zuo
authors.forename: Zhengliang
authors.initials: Z
authors.lastname: Chen
mesh_terms: D015153:Blotting, Western; D003001:Cloning, Molecular; D018076:DNA, Complementary; D005822:Genetic Vectors; D006367:HeLa Cells; D006801:Humans; D017493:Leukocyte Common Antigens / Q000235:genetics*; D007963:Leukocytes, Mononuclear; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000235:genetics; D014162:Transfection
chemical_list: D018076:DNA, Complementary; D011994:Recombinant Proteins; D017493:Leukocyte Common Antigens; C516769:PTPRC protein, human