title: Reactive oxygen species activate human peripheral blood dendritic cells.
abstract: This study investigates the effects of hydrogen peroxide, a potent oxygen free radical donor, on the phenotype and function of dendritic cells differentiated from peripheral blood precursors. We report that hydrogen peroxide induces an up-regulation of several dendritic cell surface markers involved in interaction with T cells, including MHC Class II molecules (DQ and DR) and the co-stimulatory molecules CD40 and CD86. Moreover we have observed that H2O2-treated dendritic cells are more efficient in promoting T cell proliferation than normal dendritic cells and that this enhancement can be blocked using the free radical scavenger agent N-acetylcysteine. Oxygen free radicals are a common by-product of inflammation, and our results suggest they may play an important role in activation of sentinel dendritic cells, linking tissue damage to the initiation of an adaptive immune response.
authors.affiliation: Immunology Department, Windeyer Institute of Medical Sciences, University College London, UK.
authors.forename: K
authors.initials: K
authors.lastname: Rutault
authors.forename: C
authors.initials: C
authors.lastname: Alderman
authors.forename: B M
authors.initials: BM
authors.lastname: Chain
authors.forename: D R
authors.initials: DR
authors.lastname: Katz
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D015703:Antigens, CD / Q000378:metabolism; D051940:B7-2 Antigen; D019013:CD40 Antigens / Q000378:metabolism; D002450:Cell Communication; D003713:Dendritic Cells / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism*; D016166:Free Radical Scavengers / Q000494:pharmacology; D006683:HLA-DQ Antigens / Q000378:metabolism; D006684:HLA-DR Antigens / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008562:Membrane Glycoproteins / Q000378:metabolism; D018384:Oxidative Stress; D010641:Phenotype; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D015703:Antigens, CD; D051940:B7-2 Antigen; D019013:CD40 Antigens; C497964:CD86 protein, human; D016166:Free Radical Scavengers; D006683:HLA-DQ Antigens; D006684:HLA-DR Antigens; D008562:Membrane Glycoproteins; D017382:Reactive Oxygen Species; D006861:Hydrogen Peroxide; D000111:Acetylcysteine