title: Naive T lymphocytes traffic to inflamed central nervous system, but require antigen recognition for activation.
abstract: Organ-specific autoimmune diseases may be induced by infiltration of the target tissue by CD4(+) T cells with specificity for self antigen(s). As disease progresses, T cells of other specificities appear in the tissue. Traffic of naive, antigen-inexperienced T cells to target tissues has not been shown, although many studies have shown extravasation of activated or memory T cells. We have used a novel experimental system to track naive T cells to the central nervous system (CNS) in TCR transgenic mice with adoptively transferred experimental autoimmune encephalomyelitis. Ovalbumin (OVA)-specific CD4(+) T cells were equivalent in number to disease-inducing myelin basic protein (MBP)-specific T cells at disease onset. Furthermore, OVA-specific T cells retained a naive phenotype and did not transcribe Th1 cytokines, in contrast to MBP-specific T cells. These findings demonstrate that the T cell pool in the CNS of animals with demyelinating disease contains potential recruits from the time of disease onset, and that T cells require more than an inflammatory milieu for their induction to the autoimmune attack.
authors.affiliation: Neuroimmunology Unit, Montreal Neurological Institute, and Department of Neurology andNeurosurgery, McGill University, Montreal, Canada.
authors.forename: M L
authors.initials: ML
authors.lastname: Krakowski
authors.forename: T
authors.initials: T
authors.lastname: Owens
mesh_terms: D019264:Adoptive Transfer; D000595:Amino Acid Sequence; D000818:Animals; D000941:Antigens / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002490:Central Nervous System / Q000276:immunology* / Q000473:pathology; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology* / Q000473:pathology*; D005260:Female; D005434:Flow Cytometry; D007371:Interferon-gamma / Q000235:genetics; D008198:Lymph Nodes / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008815:Mice, Inbred Strains; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D004676:Myelin Basic Protein / Q000276:immunology; D010047:Ovalbumin / Q000276:immunology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology / Q000378:metabolism; D013997:Time Factors
chemical_list: D000941:Antigens; D004676:Myelin Basic Protein; D012333:RNA, Messenger; D011948:Receptors, Antigen, T-Cell; D007371:Interferon-gamma; D010047:Ovalbumin