title: [Regulation of CD3, CD4 and CD8 expressions on PMA-activated human peripheral T cells].
abstract: To investigate the effect of mitogen Phorbol 12-myristate 13-Acetate (PMA) on CD3, CD4 and CD8 expression of human T-lymphocytes.
  
  
  
  Peripheral blood mononuclear cells from 37 blood samples stimulated in vitro with PMA at different concentrations (2,5,10,20 and 50 ng/ml for 4 hours) and time (10 ng/ml for 2,4 and 6 hours) were analyzed by 4-color flow cytometry (FCM).
  
  
  
  Under different PMA stimulation protocols,significant CD4 down-regulation was observed,which was negatively correlated with intracellular cytokine secretion (r=  0.601,P<.001), except for PMA stimulation at 10 ng/ml for 2-hours which showed no significant intracellular cytokine secretion. The expressions of CD3 and CD8 molecules after PMA activation were not significantly affected as compared with pre-activation. Among CD3 positive T  lymphocytes, CD4/CD8 double-negative cells only account for 5.52%.
  
  
  
  PMA has a significant down-regulation effect on CD4 molecules of Th cells, without altering the CD3 and CD8 expression. For quantitative analysis of Th1/Th2 variation, indirect method such as CD3(+)CD8(  ) T cells can be used to define CD4(+) Th cells stimulated by PMA in the future.
authors.affiliation: The Affiliated Children's Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Mao
authors.forename: Zhi-min
authors.initials: ZM
authors.lastname: Chen
authors.forename: Yong-min
authors.initials: YM
authors.lastname: Tang
authors.forename: Li
authors.initials: L
authors.lastname: Liang
authors.forename: Li-zhong
authors.initials: LZ
authors.lastname: Du
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D017252:CD3 Complex / Q000097:blood*; D015704:CD4 Antigens / Q000097:blood*; D016827:CD8 Antigens / Q000097:blood*; D002648:Child; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D008213:Lymphocyte Activation / Q000187:drug effects*; D013601:T-Lymphocytes / Q000737:chemistry / Q000187:drug effects*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology
chemical_list: D017252:CD3 Complex; D015704:CD4 Antigens; D016827:CD8 Antigens; D015847:Interleukin-4; D007371:Interferon-gamma; D013755:Tetradecanoylphorbol Acetate