title: Antigen-specific suppression by induced CD4+CD25high regulatory T cells in kidney recipients.
abstract: The biology and function of induced CD4(+)CD25(high) regulatory T (Treg) cells have not been clarified for their specificity to a foreign antigen. To test whether the regulatory functions of the induced CD4(+)CD25(high) Treg cells after transplantation require antigen-specific triggering, we analyzed the capacity of induced CD4(+)CD25(high) Treg cells to inhibit the proliferation of conventional CD4(+)CD25(-) T cells in response to T-cell receptor stimulation using donor cells or HLA-mismatched third-party cells in vitro. CD4(+)CD25(high) Treg cells did not proliferate in response to allogeneic stimulation and suppressed proliferation of the co-cultured autologous CD4(+)CD25(-) populations in a dose-dependent manner. The proliferation of CD4(+)CD25(-)T cells from the same donor in mixed lymphocyte reactions was significantly inhibited at a 1:8 ratio of conventional T cells:Treg cells: 14,404 +/- 673 cpm without CD4(+)CD25(high) Treg cells versus 10,781 +/- 539 cpm with CD4(+)CD25(high) Treg cells P = .01). At the same 1:8 ratio, the proliferation of CD4(+)CD25(-) cells derived from major histocompatibility complex-mismatched patients was not significantly inhibited: 14,404 +/- 673 cpm without CD4(+)CD25(high) Treg cells versus 12,471 +/- 709 cpm with CD4(+)CD25(high) Treg cells (P = .06). Antigen specificity of the induced CD4(+)CD25(high) Treg cells was demonstrated, after transplantation, supporting the use of antigen-specific Treg cells as a therapeutic strategy.
authors: Organ Transplant Center, The Chinese People's Liberation Army General Hospital, Beijing, China.
authors: Z
authors: Z
authors: Wang
authors: X-Y
authors: XY
authors: Fu
authors: B-Y
authors: BY
authors: Shi
authors: Y-Y
authors: YY
authors: Qian
authors: L
authors: L
authors: Xiao
authors: H-W
authors: HW
authors: Bai
mesh_terms: D004359:Drug Therapy, Combination; D005838:Genotype; D006680:HLA Antigens / Q000235:genetics; D015234:HLA-A Antigens / Q000235:genetics; D015798:HLA-DR1 Antigen / Q000235:genetics; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I / Q000235:genetics; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use; D016030:Kidney Transplantation / Q000276:immunology*; D019520:Living Donors; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D014019:Tissue Donors
chemical_list: D006680:HLA Antigens; D015234:HLA-A Antigens; D015798:HLA-DR1 Antigen; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I; D007166:Immunosuppressive Agents