Among 39 patients (23 males, 16 females) with sacroiliitis (SI) 17 were HLA-B27 positive. The female/male ratio in the B27-positive group was 2/15. Seventy-four first-degree relatives of 26 probands were also investigated. A high occurrence of SI (20%) was observed in the families of B27-positive probands compared with only 3.7% in the families of B27-negative probands. In the former families S...

A flow cytometric assay for lymphocyte HLA-B27 expression using a two-color direct immunofluorescent assay was compared to traditional microlymphocytotoxicity testing on 209 clinical samples. For the flow cytometric assay, whole blood was mixed with a monoclonal anti-B27 conjugated to fluorescein-isothiocyanate (FITC) and anti-CD3 conjugated to phycoerythrin (PE). The samples were analyzed with...

The HLA class I molecules identified serologically as HLA-B27 are highly associated with ankylosing spondylitis and related human disorders. All known HLA-B27 amino acid sequences contain a cysteine residue at position 67; no other published HLA class I sequence contains a cysteine within the hypervariable region of the alpha 1 domain, which extends from amino acid residues 63-84. To investigat...

After precipitation of the HLA-B27 antigen from the surface of peripheral blood lymphocytes (PBL) by means of an anti-HLA-B27 allospecific monoclonal antibody 2-dimensional gel electrophoresis was used to compare the structure of the B27 antigens derived from 5 patients with ankylosing spondylitis with that of healthy HLA-B27 positive counterparts. No significant difference in polypeptide struc...

The interplay between triggering bacteria and HLA-B27 in the pathogenesis of the spondyloarthropathies remains one of the most active areas of investigation in the rheumatic diseases. This has proved difficult to study systematically in the clinical setting, and in this study we utilized a rat model to address the influence that B27-related immunity may have on the process of generating anti-Ch...

INTRODUCTION HLA-B27 genotyping is commonly used to support a diagnosis of ankylosing spondylitis (AS). A recent study has suggested that HLA-B27 may adversely affect longevity. The objectives of this study were to determine, for the first time, the prevalence of HLA-B27 in the New Zealand population, and to test whether HLA-B27 prevalence declines with age. METHODS 117 Caucasian controls, 11...

AIMS To characterise the clinical features of human leucocyte antigen (HLA)-B27+acute anterior uveitis (AAU) patients with or without ankylosing spondylitis (AS) and investigate the retinal vascular involvement in these patients. METHODS A total of 1056 HLA-B27+ AAU patients (1525 eyes) were retrospectively studied from April 2008 to February 2016. Patients were divided into human leucocyte a...

BACKGROUND AND OBJECTIVE AS and other spondyloarthritides (SpA) are mostly chronic inflammatory rheumatic diseases characterised by a strong association with HLA B27. Recent data from our group have suggested that AS patients have a diminished secretion capacity of inflammatory cytokines, possibly associated with HLA B27. The aim of this study was to identify CD4+ and CD8+ T cell subsets respon...

Crystallographic studies have suggested that the cysteine at position 67 (Cys(67)) in the B pocket of the MHC molecule HLA-B*2705 is of importance for peptide binding, and biophysical studies have documented altered thermodynamic stability of the molecule when Cys(67) was mutated to serine (Ser(67)). In this study, we used HLA-B27.Cys(67) and HLA-B27.Ser(67) tetramers with defined T cell epitop...

One hundred and twenty-eight of 145 patients with ankylosing spondylitis (AS) were found to be HLA B27 positive. Five patients had evidence of a sero-negative peripheral arthritis resembling peripheral psoriatic arthritis and 3 of these were B27 negative. One further B27 negative patients had a sister with ankylosing spondylitis and ulcerative colitis and a mother with ulcerative colitis. There...