title: TNF-alpha receptor 1 deficiency reduces antigen-presenting capacity of Schwann cells and ameliorates experimental autoimmune neuritis in mice.
abstract: Tumor necrosis factor-alpha (TNF-alpha) is a pleiotropic pro-inflammatory cytokine with potentially neurodestructive effects and plays a pivotal role in autoimmune demyelinating disease. To address the role of TNF-alpha in the pathogenesis of experimental autoimmune neuritis (EAN), the current study investigated the antigen-presenting capacity of Schwann cells (SCs) in EAN induced by P0 protein peptide 106-125 in TNF-alpha receptor 1 deficient (TNFR1(-/-)) mice. The antigen-presenting capacity of SCs was assessed by the expression of MHC class II (MHCII), CD40, CD80 and CD86 molecules on activated SCs as well as by induction of T cell proliferation in co-cultures of P0 protein peptide 106-125 specific T cells with activated SCs. In addition, the expression of inducible nitric oxide synthase (iNOS) was measured in activated SCs by flow cytometry. TNFR1(-/-) EAN mice developed significantly delayed and reduced clinical signs of EAN compared to wild type EAN mice. In parallel, the expression of MHCII, CD80 and iNOS on SCs were decreased in TNFR1(-/-) mice compared to wild type mice. Likewise, proliferation of P0 protein peptide 106-125 specific T cells simulated by activated SCs of TNFR1(-/-) EAN mice was lower than that of wild type EAN mice. Our data suggest that TNF-alpha may exert pro-inflammatory effects in EAN via TNFR1 by up-regulating the antigen-presenting function and iNOS production of SCs.
authors.affiliation: Department of Neurology, First Hospital of Jilin University, Changchun, China.
authors.forename: Xi-Jing
authors.initials: XJ
authors.lastname: Mao
authors.forename: Xing-Mei
authors.initials: XM
authors.lastname: Zhang
authors.forename: Hong-Liang
authors.initials: HL
authors.lastname: Zhang
authors.forename: Hernan Concha
authors.initials: HC
authors.lastname: Quezada
authors.forename: Eilhard
authors.initials: E
authors.lastname: Mix
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Bengt
authors.initials: B
authors.lastname: Winblad
authors.forename: Abdu
authors.initials: A
authors.lastname: Adem
authors.forename: Jie
authors.initials: J
authors.lastname: Zhu
mesh_terms: D000818:Animals; D000941:Antigens / Q000378:metabolism*; D049109:Cell Proliferation; D002478:Cells, Cultured; D018920:Coculture Techniques; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018993:Myelin P0 Protein / Q000378:metabolism; D009444:Neuritis, Autoimmune, Experimental / Q000378:metabolism*; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D012583:Schwann Cells / Q000201:enzymology / Q000378:metabolism*; D013601:T-Lymphocytes / Q000502:physiology; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D000941:Antigens; D018993:Myelin P0 Protein; D047888:Receptors, Tumor Necrosis Factor, Type I; C506236:Tnfrsf1a protein, mouse; D014409:Tumor Necrosis Factor-alpha; D052247:Nitric Oxide Synthase Type II