title: Anti-CD25 antibodies affect cytokine synthesis pattern of human dendritic cells and decrease their ability to prime allogeneic CD4+ T cells.
abstract: Anti-CD25 monoclonal antibodies are widely used in clinical transplantation to prevent acute allograft rejection. Although their effects on T lymphocytes have been extensively studied, their impact on human dendritic cells (DC) has never been reported. Furthermore, the role of the IL-2 in DC functions has not yet been fully elucidated. In this study, we confirm that the stimulation of human monocyte-derived DC with LPS strongly induced the expression of CD25 and that LPS-matured DC also expressed the beta and gamma chain of the IL-2R. We also showed that adding anti-CD25 monoclonal antibodies to LPS induced a decrease in IL-12, IL-1, TNF-alpha, IL-6, and IFN-gamma production and an increase in IL-10 synthesis by DC compared with stimulation with LPS alone. Furthermore, we showed that these modifications diminished the T helper priming ability of DC and polarized the alloimmune response toward TH2. In contrast, humanized anti-CD25 monoclonal antibodies did not affect the up-regulation of CD86, CD80, CD83, HLADR, or CD40 induced upon LPS stimulation. Taken together, this study discloses some previously unrecognized effects of anti-CD25 monoclonal antibodies on DC that may contribute to their clinical efficacy. In addition, this study also shed some light on the role of the IL-2 in human DC activation.
authors.affiliation: JE 2448, Cellules Dendritiques et Greffe, Faculté de Medicine, Université François Rabelais, Equipe 10 Bd Tonnelle, 37032 Tours Cedex, France.
authors.forename: K
authors.initials: K
authors.lastname: Mnasria
authors.forename: C
authors.initials: C
authors.lastname: Lagaraine
authors.forename: F
authors.initials: F
authors.lastname: Velge-Roussel
authors.forename: R
authors.initials: R
authors.lastname: Oueslati
authors.forename: Y
authors.initials: Y
authors.lastname: Lebranchu
authors.forename: C
authors.initials: C
authors.lastname: Baron
mesh_terms: D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D015704:CD4 Antigens / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D016207:Cytokines / Q000096:biosynthesis*; D003713:Dendritic Cells / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006801:Humans; D053645:Interleukin-2 Receptor alpha Subunit / Q000096:biosynthesis / Q000276:immunology*; D007519:Isoantigens / Q000276:immunology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed
chemical_list: D000888:Antibodies, Anti-Idiotypic; D015704:CD4 Antigens; D016207:Cytokines; D053645:Interleukin-2 Receptor alpha Subunit; D007519:Isoantigens; D008070:Lipopolysaccharides