title: The role of the ICOS/B7RP-1 T cell costimulatory pathway in murine experimental autoimmune uveoretinitis.
abstract: ICOS/B7RP-1 is a new member of the CD28/B7 family of costimulatory molecules and plays differential roles in autoimmune diseases. In this study, we examined the role of ICOS/B7RP-1 pathway in the pathogenesis of mouse experimental autoimmune uveoretinitis (EAU), an animal model of human autoimmune uveitis. ICOS expression was found on infiltrating CD4+ T cells in the region of the retina in EAU-induced mice. The anti-B7RP-1 monoclonal antibody (mAb)-treated or ICOS-deficient mice showed a substantial reduction of disease scores. Blockade of ICOS/B7RP-1 interaction during the effector phase ameliorated the disease, whereas its blockade during the induction phase exhibited no significant effect. Moreover, administration of anti-B7RP-1 mAb effectively ameliorated the disease induced by adoptive transfer of pathogenic T cells. The anti-B7RP-1 mAb treatment inhibited the expansion and/or effector function of pathogenic T cells, given that proliferative response and IFN-gamma production by lymph node cells were reduced upon restimulation with the antigen peptide in vitro. These results suggest that the ICOS/B7RP-1 interaction plays a critical role in the pathogenesis of uveitis. We also indicated that ICOS-mediated costimulation plays differential roles in EAU and experimental autoimmune encephalomyelitis, which is also a Th1 disease induced in the same manner as EAU.
authors.affiliation: Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Usui
authors.forename: Hisaya
authors.initials: H
authors.lastname: Akiba
authors.forename: Masaru
authors.initials: M
authors.lastname: Takeuchi
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kezuka
authors.forename: Aya
authors.initials: A
authors.lastname: Takeuchi
authors.forename: Takaaki
authors.initials: T
authors.lastname: Hattori
authors.forename: Yoko
authors.initials: Y
authors.lastname: Okunuki
authors.forename: Tomohide
authors.initials: T
authors.lastname: Yamazaki
authors.forename: Hideo
authors.initials: H
authors.lastname: Yagita
authors.forename: Masahiko
authors.initials: M
authors.lastname: Usui
authors.forename: Ko
authors.initials: K
authors.lastname: Okumura
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D001327:Autoimmune Diseases / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D018122:B7-1 Antigen / Q000032:analysis / Q000378:metabolism*; D015496:CD4-Positive T-Lymphocytes / Q000737:chemistry / Q000276:immunology* / Q000473:pathology; D004195:Disease Models, Animal; D020022:Genetic Predisposition to Disease / Q000235:genetics; D060945:Inducible T-Cell Co-Stimulator Ligand; D060889:Inducible T-Cell Co-Stimulator Protein; D007371:Interferon-gamma / Q000378:metabolism; D008198:Lymph Nodes / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D008817:Mice, Mutant Strains; D012160:Retina / Q000737:chemistry / Q000276:immunology; D012173:Retinitis / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D014605:Uveitis / Q000235:genetics / Q000276:immunology* / Q000473:pathology
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D018122:B7-1 Antigen; C556692:ICOS protein, human; C556694:Icos protein, mouse; D060945:Inducible T-Cell Co-Stimulator Ligand; D060889:Inducible T-Cell Co-Stimulator Protein; D007371:Interferon-gamma