Inhibiting HLA-B27 homodimer-driven immune cell inflammation in spondylarthritis.

Arthritis and Rheumatism
Sravan K PayeliPaul Bowness

Abstract

Spondylarthritides (SpA), including ankylosing spondylitis (AS), are common inflammatory rheumatic diseases that are strongly associated with positivity for the HLA class I allotype B27. HLA-B27 normally forms complexes with β(2) -microglobulin (β(2) m) and peptide to form heterotrimers. However, an unusual characteristic of HLA-B27 is its ability to form β(2) m-free heavy chain homodimers (HLA-B27(2) ), which, unlike classic HLA-B27, bind to killer cell immunoglobulin-like receptor 3DL2 (KIR-3DL2). Binding of HLA-B27(2) to KIR-3DL2-positive CD4+ T and natural killer (NK) cells stimulates cell survival and modulates cytokine production. This study was undertaken to produce an antibody to HLA-B27(2) in order to confirm its expression in SpA and to inhibit its proinflammatory properties. We generated monoclonal antibodies by screening a human phage display library positively against B27(2) and negatively against B27 heterotrimers. Specificity was tested by enzyme-linked immunosorbent assay (ELISA), surface plasmon resonance (SPR) assay, and fluorescence-activated cell sorting (FACS) analysis of B27(2) -expressing cell lines and peripheral blood mononuclear cells (PBMCs) and synovial fluid mononuclear cells (SFMCs) from patient...Continue Reading

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