title: Intra-CNS activation by antigen-specific T lymphocytes in experimental autoimmune encephalomyelitis.
abstract: Identification and quantitation of autoreactive T lymphocytes is crucial in order to understand the pathogenesis of autoimmune diseases. We used flow cytometry to analyze autoantigen-specific T cellular responses in the well characterized rat experimental autoimmune encephalomyelitis (EAE) model. Cells isolated from both the central nervous system (CNS) tissue and peripheral lymph nodes were analyzed directly ex vivo or after short term in vitro culture with specific autoantigen. CNS infiltrating T lymphocytes displaying an interferon-gamma response to selected encephalitogenic myelin protein epitopes were measured kinetically during an individual disease episode and also between relapses in a chronic rat EAE model. One of the EAE models used displays a restriction towards TCRBV8S2 chain usage by the encephalitogenic T cells. In this model, in vitro production of intracellular interferon-gamma was selectively detected within this T cell subset derived from both the CNS and peripheral lymph nodes. Furthermore, antigen-specific cells infiltrating the CNS in this model produced several-fold higher amounts of interferon-gamma upon antigen stimulation and displayed a significantly increased in vivo proliferation compared with peripheral lymphocytes. These data thus directly demonstrates that T cells stimulated by a specific autoantigen in the periphery primarily acquire effector functions in the cellular environment of the target organ of the autoantigen.
authors.affiliation: Neuroimmunology Unit, Center of Molecular Medicine, Department of Medicine, Karolinska Institute, Stockholm, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Muhallab
authors.forename: O
authors.initials: O
authors.lastname: Lidman
authors.forename: R
authors.initials: R
authors.lastname: Weissert
authors.forename: T
authors.initials: T
authors.lastname: Olsson
authors.forename: A
authors.initials: A
authors.lastname: Svenningsson
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001324:Autoantigens / Q000276:immunology; D001921:Brain / Q000276:immunology / Q000378:metabolism; D002455:Cell Division; D002478:Cells, Cultured; D002490:Central Nervous System / Q000473:pathology / Q000503:physiopathology*; D002908:Chronic Disease; D016207:Cytokines / Q000096:biosynthesis; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology / Q000473:pathology / Q000503:physiopathology*; D000939:Epitopes; D007371:Interferon-gamma / Q000096:biosynthesis; D007425:Intracellular Membranes / Q000378:metabolism; D007700:Kinetics; D051381:Rats; D011917:Rats, Inbred Lew; D012008:Recurrence; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology / Q000502:physiology*
chemical_list: D001324:Autoantigens; D016207:Cytokines; D000939:Epitopes; D007371:Interferon-gamma