title: Oxidation of cell surface thiol groups by contact sensitizers triggers the maturation of dendritic cells.
abstract: p38 mitogen-activated protein kinase (MAPK) has a crucial role in the maturation of dendritic cells (DCs) by sensitizers. Recently, it has been reported that the oxidation of cell surface thiols by an exogenous impermeant thiol oxidizer can phosphorylate p38 MAPK. In this study, we examined whether sensitizers oxidize cell surface thiols of monocyte-derived DCs (MoDCs). When cell surface thiols were quantified by flow cytometry using Alexa fluor maleimide, all the sensitizers that we examined decreased cell surface thiols on MoDCs. To examine the effects of decreased cell surface thiols by sensitizers on DC maturation, we analyzed the effects of an impermeant thiol oxidizer, o-phenanthroline copper complex (CuPhen). The treatment of MoDCs with CuPhen decreased cell surface thiols, phosphorylated p38 MAPK, and induced MoDC maturation, that is, the augmentation of CD83, CD86, HLA-DR, and IL-8 mRNA, as well as the downregulation of aquaporin-3 mRNA. The augmentation of CD86 was significantly suppressed when MoDCs were pretreated with N-acetyl-L-cystein or treated with SB203580. Finally, we showed that epicutaneous application of 2,4-dinitrochlorobenzene on mouse skin significantly decreased cell surface thiols of Langerhans cells in vivo. These data suggest that the oxidation of cell surface thiols has some role in triggering DC maturation by sensitizers.
authors.affiliation: Department of Dermatology, Tohoku University Graduate School of Medicine, Aoba-ku, Sendai, Japan.
authors.forename: Saori
authors.initials: S
authors.lastname: Kagatani
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Morihiko
authors.initials: M
authors.lastname: Hirota
authors.forename: Masato
authors.initials: M
authors.lastname: Mizuashi
authors.forename: Mie
authors.initials: M
authors.lastname: Suzuki
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Ohtani
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Itagaki
authors.forename: Setsuya
authors.initials: S
authors.lastname: Aiba
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D000818:Animals; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D004347:Drug Interactions; D004791:Enzyme Inhibitors / Q000494:pharmacology; D000078404:Epidermal Cells; D004817:Epidermis / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D016166:Free Radical Scavengers / Q000494:pharmacology; D006241:Haptens / Q000494:pharmacology; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D009000:Monocytes / Q000166:cytology; D016877:Oxidants / Q000494:pharmacology*; D010084:Oxidation-Reduction; D010618:Phenanthrolines / Q000494:pharmacology*; D010766:Phosphorylation / Q000187:drug effects; D011725:Pyridines / Q000494:pharmacology; D013438:Sulfhydryl Compounds / Q000378:metabolism*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D004791:Enzyme Inhibitors; D016166:Free Radical Scavengers; D006241:Haptens; D007093:Imidazoles; D016877:Oxidants; D010618:Phenanthrolines; D011725:Pyridines; D013438:Sulfhydryl Compounds; D048051:p38 Mitogen-Activated Protein Kinases; C093642:SB 203580; C025205:1,10-phenanthroline; D000111:Acetylcysteine