title: T cells are the main cell type expressing B7-1 and B7-2 in the central nervous system during acute, relapsing and chronic experimental autoimmune encephalomyelitis.
abstract: T cell co-stimulation through the CD28 receptor on T cells is critical to the induction of experimental autoimmune encephalomyelitis (EAE). In this study, expression of the co-stimulatory ligands B7-1 (CD80) and B7-2 (CD86), as well as the receptors CD28 and CTLA-4, were quantitated in central nervous system (CNS) tissues from mice at various stages of EAE. Immunohistochemistry and flow cytometry of CNS-infiltrating cells revealed a high percentage of infiltrating T cells expressing B7-1 and B7-2 during acute, chronic and relapsing EAE. Of the infiltrating cells 10-20% were CTLA-4(+), most of which were CD4(+) T cells. B7-1 and B7-2 expression within the CNS during active EAE might increase the potential for local activation of autoimmune T cells; however, the high level of expression of B7 molecules may also provide a mechanism for the autoregulation of activated CTLA-4(+) T cells.
authors.affiliation: Department of Neurology and Neurosurgery, Washington University School of Medicine, St. Louis 63110, USA. crossa@neuro.wustl.edu
authors.forename: A H
authors.initials: AH
authors.lastname: Cross
authors.forename: J A
authors.initials: JA
authors.lastname: Lyons
authors.forename: M
authors.initials: M
authors.lastname: San
authors.forename: R M
authors.initials: RM
authors.lastname: Keeling
authors.forename: G
authors.initials: G
authors.lastname: Ku
authors.forename: M K
authors.initials: MK
authors.lastname: Racke
mesh_terms: D000069594:Abatacept; D000208:Acute Disease; D000818:Animals; D015703:Antigens, CD / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D000943:Antigens, Differentiation / Q000032:analysis; D018122:B7-1 Antigen / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D051940:B7-2 Antigen; D018106:CD28 Antigens / Q000032:analysis; D060908:CTLA-4 Antigen; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology*; D005260:Female; D005434:Flow Cytometry; D018796:Immunoconjugates; D007150:Immunohistochemistry; D008198:Lymph Nodes / Q000737:chemistry / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D004676:Myelin Basic Protein / Q000276:immunology; D012333:RNA, Messenger / Q000096:biosynthesis; D012008:Recurrence; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013116:Spinal Cord / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism; D013601:T-Lymphocytes / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D018106:CD28 Antigens; D060908:CTLA-4 Antigen; C497965:Cd86 protein, mouse; C556707:Ctla4 protein, mouse; D018796:Immunoconjugates; D008562:Membrane Glycoproteins; D004676:Myelin Basic Protein; D012333:RNA, Messenger; D000069594:Abatacept