Journal of Clinical Immunology

, Volume 27, Issue 3, pp 317–326

CD4+CD25+ Regulatory T Cells Decreased the Antitumor Activity of Cytokine-Induced Killer (CIK) Cells of Lung Cancer Patients

  • Hui Li
  • Jin-Pu Yu
  • Shui Cao
  • Feng Wei
  • Peng Zhang
  • Xiu-Mei An
  • Zong-Tang Huang
  • Xiu-Bao Ren
Original Paper

 

CD4+CD25+ regulatory T cells (Tregs) have been shown to inhibit cytotoxic lymphocytes-mediated immune responses. Cytokine-induced killer (CIK) cells exert high impact on adoptive immunotherapeutic approaches. Therefore, the purpose of this report was to determine the effect of Tregs on CIK cell growth and CIK-induced cytotoxicity for inhibition of tumor growth in vivo as well as in vitro. After depletion of CD4+CD25+ cells before culture, the proliferation and cytotoxicity of CIK cells, which indicated in bromodeoxyuridine (BrdU) and lactic dehydrogenase (LDH) assays, were significantly increased. Depletion of CD4+CD25+ cells preculture also enhanced the suppression effect on the lung cancer cells inoculated in experimental animals. Blockage of glucocorticoid-induced tumor necrosis factor receptor (GITR) and transforming growth factor β1 (TGF-β1) by antibodies partially abrogated the suppressive effect of CD4+CD25+ cells on CIK. These results indicated that Tregs could inhibit the antitumor activity of CIK cells. The molecules TGF-β and GITR may contribute to the suppressive function of CD4+CD25+ cells.

KEY WORDS:

CD4+CD25+ regulatory T cells CIK GITR TGF-β 

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Hui Li
    • 1
  • Jin-Pu Yu
    • 1
  • Shui Cao
    • 1
  • Feng Wei
    • 1
  • Peng Zhang
    • 1
  • Xiu-Mei An
    • 1
  • Zong-Tang Huang
    • 1
  • Xiu-Bao Ren
    • 1
  1. 1.Department of ImmunologyCancer Institute and Hospital, Tianjin Medical UniversityTianjinChina

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