title: HLA-B27 heavy chain homodimers are expressed in HLA-B27 transgenic rodent models of spondyloarthritis and are ligands for paired Ig-like receptors.
abstract: HLA-B27 transgenic rats and strains of HLA-B27-transgenic beta(2)-microglobulin (beta(2)m)-deficient mice develop a multisystem inflammatory disease affecting the joints, skin, and bowel with strong similarity to human spondyloarthritis. We show that HLA-B27 transgenic mice and rats express HC10-reactive, beta(2)m-free HLA-B27 homodimers (B27(2)) and multimers, both intracellularly and at the cell surface of leukocytes, including rat dendritic cells. Fluorescent-labeled tetrameric complexes of HLA-B27 homodimers (B27(2) tetramers) bind to populations of lymphocytes, monocytes, and dendritic cells. The murine (and probably rat) paired Ig-like receptors (PIRs) are ligands for B27(2). Thus, B27(2) tetramers stain RBL cells transfected with murine activating PIR-A4 and inhibitory PIR-B receptors. Murine PIR-A and -B can be immunoprecipitated from the RAW264.7 macrophage cell line, and murine PIR-A can be immunoprecipitated from the J774.A1 line using B27(2). B27(2) tetramer staining corresponds to the distribution of PIR expression on lymphoid and myeloid cells and on murine macrophage cell lines. B27(2) can induce TNF-alpha release from the J774.A1 macrophage cell line. The binding of B27(2) to PIR is inhibited by HC10, an mAb that ameliorates arthritis in HLA-B27(+) beta(2)m(-/-) mice. The expression and PIR recognition of B27(2) could explain the pathogenesis of rodent spondyloarthritis.
authors.affiliation: Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford, United Kingdom.
authors.forename: Simon
authors.initials: S
authors.lastname: Kollnberger
authors.forename: Lucy A
authors.initials: LA
authors.lastname: Bird
authors.forename: Matthew
authors.initials: M
authors.lastname: Roddis
authors.forename: Cecile
authors.initials: C
authors.lastname: Hacquard-Bouder
authors.forename: Hiromi
authors.initials: H
authors.lastname: Kubagawa
authors.forename: Helen C
authors.initials: HC
authors.lastname: Bodmer
authors.forename: Maxime
authors.initials: M
authors.lastname: Breban
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: McMichael
authors.forename: Paul
authors.initials: P
authors.lastname: Bowness
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D000911:Antibodies, Monoclonal / Q000276:immunology; D001704:Biopolymers; D019921:Biotinylation; D002460:Cell Line / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology / Q000378:metabolism; D019281:Dimerization; D004195:Disease Models, Animal; D015796:HLA-B27 Antigen / Q000737:chemistry / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D008024:Ligands; D016131:Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism; D008264:Macrophages / Q000276:immunology / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D011233:Precipitin Tests; D011485:Protein Binding; D051381:Rats; D011971:Receptors, Immunologic / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000276:immunology / Q000378:metabolism; D025241:Spondylarthritis / Q000235:genetics / Q000276:immunology*; D013167:Spondylitis, Ankylosing / Q000235:genetics / Q000276:immunology; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D001613:beta 2-Microglobulin / Q000172:deficiency / Q000235:genetics
chemical_list: D000911:Antibodies, Monoclonal; D001704:Biopolymers; D015796:HLA-B27 Antigen; D008024:Ligands; C105948:Pira1 protein, mouse; C105949:Pirb protein, mouse; C491380:Pirb protein, rat; D011971:Receptors, Immunologic; D011993:Recombinant Fusion Proteins; D014409:Tumor Necrosis Factor-alpha; D001613:beta 2-Microglobulin