title: Amelioration of collagen-induced arthritis by blockade of inducible costimulator-B7 homologous protein costimulation.
abstract: B7 homologous protein (B7h)/B7-related protein 1 (B7RP-1) is a new member of the B7 family of costimulatory molecules that specifically interacts with inducible costimulator (ICOS) expressed on activated T cells. Collagen type II (CII)-induced arthritis (CIA) is an experimental model of arthritis that has been used to dissect the pathogenesis of human rheumatoid arthritis. In this study, we have investigated the effect of neutralizing anti-B7h mAb on the development and disease progression of CIA. Administration of anti-B7h mAb significantly ameliorated the disease as assessed by clinical arthritis score and histology in the joints, and a beneficial effect was also obtained by a delayed treatment after the onset of disease. Expression of ICOS and B7h was observed in the inflamed synovial tissue as well as in the draining lymph nodes (LNs) and expansion of ICOS(+) T cells in the LN was reduced by the anti-B7h mAb treatment. Expression of mRNA for proinflammatory cytokines such as TNF-alpha, IL-1beta, and IL-6 in the joints was inhibited by the treatment. Proliferative responses and production of IFN-gamma and IL-10 upon restimulation with CII in vitro were significantly inhibited in LN cells from the anti-B7h mAb-treated mice. Serum anti-CII IgG1, IgG2a, and IgG2b levels were also reduced. Our present results showed a beneficial effect of the B7h blockade on CIA through anti-inflammatory actions and inhibition of both Th1- and Th2-mediated immune responses, suggesting that the ICOS-B7h interaction plays an important role in the pathogenesis of CIA and thus the blockade of this pathway may be beneficial for the treatment of human rheumatoid arthritis.
authors.affiliation: Department of Molecular Immunology, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Iwai
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kozono
authors.forename: Sachiko
authors.initials: S
authors.lastname: Hirose
authors.forename: Hisaya
authors.initials: H
authors.lastname: Akiba
authors.forename: Hideo
authors.initials: H
authors.lastname: Yagita
authors.forename: Ko
authors.initials: K
authors.lastname: Okumura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kohsaka
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Miyasaka
authors.forename: Miyuki
authors.initials: M
authors.lastname: Azuma
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology* / Q000627:therapeutic use; D000945:Antigens, Differentiation, T-Lymphocyte / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D001169:Arthritis, Experimental / Q000276:immunology* / Q000473:pathology / Q000517:prevention & control* / Q000628:therapy; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000276:immunology / Q000502:physiology*; D002358:Cartilage, Articular / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D002417:Cattle; D024043:Collagen Type II / Q000037:antagonists & inhibitors / Q000276:immunology*; D016207:Cytokines / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D015536:Down-Regulation / Q000276:immunology*; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D006614:Hindlimb; D007074:Immunoglobulin G / Q000096:biosynthesis; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D060945:Inducible T-Cell Co-Stimulator Ligand; D060889:Inducible T-Cell Co-Stimulator Protein; D007249:Inflammation / Q000276:immunology / Q000517:prevention & control; D008198:Lymph Nodes / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D008213:Lymphocyte Activation / Q000276:immunology; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D018122:B7-1 Antigen; D024043:Collagen Type II; D016207:Cytokines; D018984:Epitopes, T-Lymphocyte; C556692:ICOS protein, human; C556694:Icos protein, mouse; D007074:Immunoglobulin G; D007166:Immunosuppressive Agents; D060945:Inducible T-Cell Co-Stimulator Ligand; D060889:Inducible T-Cell Co-Stimulator Protein