title: Induction of auto-reactive regulatory T cells by stimulation with immature autologous dendritic cells.
abstract: We have shown in ex vivo studies in donor bone marrow-infused kidney transplant recipients, that chimeric cells of either donor or recipient origin taken from the recipient's bone marrow down-regulated the recipient's cellular immune responses. In the present study, we have now induced regulatory T cells from peripheral blood mononuclear cells (PBMC) of renal transplant recipients or laboratory volunteers by multi-stimulation with autologous immature dendritic cell (iDC) enriched populations derived from either bone marrow cells (BMC) of the (immunosuppressed) kidney transplant recipients or PBMC of the laboratory volunteers (i.e., ibDC and ipDC, respectively). These regulatory T cells, induced by ibDC and ipDC, were autoreactive and designated as TAb and TAp with similar phenotypes and functional profiles. They were largely CD4 + CD25high, CD45RA low and CD45RO high, and uniformly expressed intracellular CTLA-4, and message of IL-4, IL-10, Foxp3, and differentially expressed TGFbeta. Their proliferative responses to autologous mature dendritic stimulating cells (mDC) were approximately two-fold stronger than to allogeneic mDC, and to allogeneic mDC were significantly lower than those of (control) autologous TPBL, suggesting an anergic state. TAb and TAp were not cytotoxic to autologous cells expressing Epstein-Barr virus (EBV) antigens, but were able to inhibit (regulate) the effector phase of this TPBL response to both autologous and allogeneic EBV lymphoblasts. This regulation appeared to require cell-to-cell contact.
authors: The Lillian Jean Kaplan Renal Transplant Center of the Division of Transplantation of the Department of Surgery, University of Miami, Leonard M. Miller School of Medicine, Miami, Florida 33101, USA. YJin@med.miami.edu
authors: Yide
authors: Y
authors: Jin
authors: Laphalle
authors: L
authors: Fuller
authors: Violet
authors: V
authors: Esquenazi
authors: Bonnie B
authors: BB
authors: Blomberg
authors: George W
authors: GW
authors: Burke
authors: Gaetano
authors: G
authors: Ciancio
authors: Andreas G
authors: AG
authors: Tzakis
authors: Camillo
authors: C
authors: Ricordi
authors: Joshua
authors: J
authors: Miller
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D002450:Cell Communication / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology*; D015536:Down-Regulation; D020031:Epstein-Barr Virus Infections / Q000276:immunology; D051858:Forkhead Transcription Factors / Q000096:biosynthesis / Q000276:immunology; D004854:Herpesvirus 4, Human / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular; D053645:Interleukin-2 Receptor alpha Subunit / Q000096:biosynthesis / Q000276:immunology; D016030:Kidney Transplantation / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: C418974:FOXP3 protein, human; D051858:Forkhead Transcription Factors; D053645:Interleukin-2 Receptor alpha Subunit