title: TNFR1-dependent regulation of myeloid cell function in experimental autoimmune uveoretinitis.
abstract: Experimental autoimmune uveoretinitis is an autoimmune disease induced in mice, which involves the infiltration of CD11b(+) macrophages and CD4(+) T cells into the normally immune-privileged retina. Damage is produced in the target organ following the activation of Th1 and Th17 T cells and by the release of cytotoxic mediators such as NO by activated macrophages. The majority of immune cells infiltrating into the retina are CD11b(+) myeloid cells, but, despite the presence of these APCs, relatively limited numbers of T cells are observed in the retina during the disease course. These T cells do not proliferate when leukocytes are isolated from the retina and restimulated in vitro, although they do produce both IFN-gamma and IL-17. T cell proliferation was restored by depleting the myeloid cells from the cultures and furthermore those isolated myeloid cells were able to regulate the proliferation of other T cells. The ability of macrophages to regulate proliferation depends on activation by T cell-produced IFN-gamma and autocrine TNF-alpha signaling in the myeloid cells via TNFR1. In the absence of TNFR1 signaling, relative T cell expansion in the retina is increased, indicating that regulatory myeloid cells may also act in vivo. However, TNFR1 signaling is also required for macrophages, but not T cells, to migrate into the target organ. Thus, in TNFR1 knock out mice, the amplification of autoimmunity is limited, leading to resistance to experimental autoimmune uveoretinitis induction.
authors.affiliation: Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
authors.forename: Ben J E
authors.initials: BJ
authors.lastname: Raveney
authors.forename: David A
authors.initials: DA
authors.lastname: Copland
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Dick
authors.forename: Lindsay B
authors.initials: LB
authors.lastname: Nicholson
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001327:Autoimmune Diseases / Q000235:genetics / Q000276:immunology* / Q000473:pathology*; D002465:Cell Movement / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D005260:Female; D008264:Macrophages / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D022423:Myeloid Cells / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D047888:Receptors, Tumor Necrosis Factor, Type I / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D012173:Retinitis / Q000235:genetics / Q000276:immunology* / Q000473:pathology*; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D053319:Tumor Necrosis Factor Decoy Receptors / Q000172:deficiency / Q000235:genetics / Q000502:physiology; D014605:Uveitis / Q000235:genetics / Q000276:immunology* / Q000473:pathology*
chemical_list: D047888:Receptors, Tumor Necrosis Factor, Type I; C506236:Tnfrsf1a protein, mouse; D053319:Tumor Necrosis Factor Decoy Receptors; C069521:recombinant human tumor necrosis factor-binding protein-1