title: Abrogation of high-affinity IgE receptor-mediated mast cell activation at the effector phase prevents contact hypersensitivity to oxazolone.
abstract: Inflammatory mediators released from mast cells (MCs) through engagement of the high-affinity receptor for IgE (FcepsilonRI) have pivotal roles in chemical allergen-induced contact hypersensitivity (CHS) reactions, which suggests that the blockade of MC activation through FcepsilonRI stimulation may attenuate allergic contact dermatitis (CD). To address this possibility, we employed the following two approaches: (i) modulation of FcepsilonRI-mediated MC activation by introducing mutations in tyrosine residues of the FcepsilonRI beta-chain immunoreceptor tyrosine-based activation motif (ITAM) and (ii) blockade of FcepsilonRI-mediated MC activation employing a recombinant soluble ecto-domain of the human FcepsilonRIalpha-chain (rsFcepsilonRIalpha). In this study, we show that optimal MC activation through the FcepsilonRI beta-chain ITAM has essential roles in the onset of CHS to oxazolone (Oxa), a well-characterized chemical allergen. In addition, we demonstrate that administration of the rsFcepsilonRIalpha after sensitization successfully prevents murine CHS to Oxa. In a chronic CD model elicited by multiple challenges with low-dose Oxa, application of the rsFcepsilonRIalpha during the course of the challenges showed suppressive effects on CHS to Oxa. Taken together, our data indicate that inhibition of FcepsilonRI-dependent MC activation can suppress allergic CD.
authors.affiliation: Division of Molecular Cell Immunology and Allergology, Advanced Medical Research Center, Department of Dermatology, Nihon University Graduate School of Medical Science, 30-1 Oyaguchikami-cho Itabashi-ku, Tokyo, Japan.
authors.forename: Maiko
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nunomura
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Gon
authors.forename: Daisuke
authors.initials: D
authors.lastname: Endo
authors.forename: Sachiko
authors.initials: S
authors.lastname: Kishiro
authors.forename: Makiko
authors.initials: M
authors.lastname: Fukunaga
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kitahata
authors.forename: Tadashi
authors.initials: T
authors.lastname: Terui
authors.forename: Chisei
authors.initials: C
authors.lastname: Ra
mesh_terms: D000276:Adjuvants, Immunologic / Q000633:toxicity; D019264:Adoptive Transfer; D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D003877:Dermatitis, Contact / Q000276:immunology* / Q000378:metabolism / Q000517:prevention & control*; D005260:Female; D007073:Immunoglobulin E / Q000276:immunology* / Q000378:metabolism; D008297:Male; D008407:Mast Cells / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D016296:Mutagenesis / Q000276:immunology; D010081:Oxazolone / Q000633:toxicity; D017455:Receptors, IgE / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D014162:Transfection
chemical_list: D000276:Adjuvants, Immunologic; C521907:Fc-epsilon receptor I beta-chain, mouse; D017455:Receptors, IgE; D010081:Oxazolone; D007073:Immunoglobulin E