title: Epitope specificity of autoreactive T and B cells associated with experimental autoimmune encephalomyelitis and optic neuritis induced by oligodendrocyte-specific protein in SJL/J mice.
abstract: The encephalitogenic potential of oligodendrocyte-specific protein (OSP) in mice, its specific localization in the intralamellar tight junctions in CNS myelin, and the detection of autoreactivity against OSP in multiple sclerosis (MS) strongly suggest the relevance of autoreactivity against OSP in the pathogenesis of MS. In this study, we have characterized the autoimmune T and B cells that are associated with clinicopathological manifestations of OSP-induced MS-like disease in mice by using recombinant soluble mouse OSP (smOSP) and synthetic overlapping peptides spanning smOSP. SJL/J mice immunized with smOSP developed chronic relapsing clinical experimental autoimmune encephalomyelitis accompanied with intense perivascular and parenchymal inflammatory infiltrates, widespread demyelination, axonal loss, and remarkable optic neuritis. The smOSP-primed lymph node cells reacted predominantly against OSP55-80 and to a lesser extent also to OSP22-46 and OSP179-207. Unexpectedly, in vitro selection with smOSP resulted in pathogenic smOSP-specific CD4+ T cells that reacted equally well against OSP55-80, OSP22-46, OSP45-66, and OSP179-207. Fine analysis of the anti-OSP autoimmunity revealed that the disease is primarily associated with CD4+ T cells directed against the major (OSP55-80) and the minor (OSP179-207) encephalitogenic regions that were further delineated, both in vitro and in vivo, to OSP55-66 and OSP194-207, respectively. In contrast, the OSP-induced Abs were predominantly directed against OSP22-46; these Abs were mostly of IgG1 isotype, but high levels of IgG2a and IgG2b and significant levels of IgE were also observed. The reactivity of pathogenic T cells to two encephalitogenic regions, OSP55-80 and OSP179-207, and their diverse TCRVbeta gene repertoire may impose difficulties for epitope-directed or TCR-targeting approaches to immune-specific modulation of OSP-related pathogenesis.
authors.affiliation: Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel.
authors.forename: Nathali
authors.initials: N
authors.lastname: Kaushansky
authors.forename: Ming-Chao
authors.initials: MC
authors.lastname: Zhong
authors.forename: Nicole
authors.initials: N
authors.lastname: Kerlero de Rosbo
authors.forename: Romana
authors.initials: R
authors.lastname: Hoeftberger
authors.forename: Hans
authors.initials: H
authors.lastname: Lassmann
authors.forename: Avraham
authors.initials: A
authors.lastname: Ben-Nun
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001323:Autoantibodies / Q000096:biosynthesis / Q000097:blood; D001324:Autoantigens / Q000008:administration & dosage / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002460:Cell Line; D002908:Chronic Disease; D057167:Claudins; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology* / Q000473:pathology; D018604:Epitope Mapping; D018985:Epitopes, B-Lymphocyte / Q000008:administration & dosage / Q000276:immunology*; D018984:Epitopes, T-Lymphocyte / Q000008:administration & dosage / Q000276:immunology*; D005260:Female; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor; D051379:Mice; D008809:Mice, Inbred C3H; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000008:administration & dosage / Q000276:immunology*; D009836:Oligodendroglia / Q000276:immunology; D009902:Optic Neuritis / Q000276:immunology* / Q000473:pathology; D010446:Peptide Fragments / Q000008:administration & dosage / Q000276:immunology; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism
chemical_list: D001323:Autoantibodies; D001324:Autoantigens; D057167:Claudins; C492354:Cldn11 protein, mouse; D018985:Epitopes, B-Lymphocyte; D018984:Epitopes, T-Lymphocyte; D009419:Nerve Tissue Proteins; D010446:Peptide Fragments; D016693:Receptors, Antigen, T-Cell, alpha-beta