title: Elevated interferon gamma expression in the central nervous system of tumour necrosis factor receptor 1-deficient mice with experimental autoimmune encephalomyelitis.
abstract: Inflammation in the central nervous system (CNS) can be studied in experimental autoimmune encephalomyelitis (EAE). The proinflammatory cytokines interferon-gamma (IFN-gamma) and tumour necrosis factor (TNF) are implicated in EAE pathogenesis. Signals through the type 1 TNF receptor (TNFR1) are required for severe EAE to develop, whereas deficiency in IFN-gamma or its receptor result in more severe EAE. We investigated IFN-gamma expression in TNFR1-deficient (TNFR1-/-) mice. We describe here that there were more IFN-gamma-secreting T cells present in the CNS of TNFR1-/- mice during EAE compared to wild-type (WT) mice, despite that clinical symptoms were mild, with delayed onset. There was greater expression of IL-12/23p40 by antigen-presenting cells in these mice, and in vitro, TNFR1-/- antigen-presenting cells induced greater secretion of IFN-gamma but not interleukin (IL)-17 when cultured with primed T cells than did WT antigen presenting cells. TNFR1-/- mice with EAE had significantly higher expression of CXCL10 mRNA (but not CCL5 mRNA) in the CNS compared to WT mice with EAE. These data demonstrate that IFN-gamma expression is enhanced in the CNS of TNFR1-/- mice with EAE and suggest that IFN-gamma levels do not necessarily correlate with EAE severity.
authors.affiliation: Neuroimmunology Unit, Montreal Neurological Institute, Montreal, Quebec, Canada.
authors.forename: Rachel D
authors.initials: RD
authors.lastname: Wheeler
authors.forename: Simone P
authors.initials: SP
authors.lastname: Zehntner
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Kelly
authors.forename: Lyne
authors.initials: L
authors.lastname: Bourbonnière
authors.forename: Trevor
authors.initials: T
authors.lastname: Owens
mesh_terms: D000818:Animals; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000235:genetics / Q000276:immunology* / Q000382:microbiology; D005786:Gene Expression Regulation; D007371:Interferon-gamma / Q000032:analysis / Q000235:genetics*; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000032:analysis / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013116:Spinal Cord / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D047888:Receptors, Tumor Necrosis Factor, Type I; D007371:Interferon-gamma