BACKGROUND Spondyloarthropathies are a group of closely related inflammatory arthritis which involve the axial skeleton and are negative for rheumatoid factor. OBJECTIVE This case-control study was conducted to examine HLA- B27 positivity in patients with seronegative spondyloarthritis (SSA) as per ESSG criteria and compare the frequency with healthy controls because a lower positivity is rep...

The class I major histocompatibility complex (MHC) glycoprotein HLA-B27 binds short peptides containing arginine at peptide position 2 (P2). The HLA-B27/peptide complex is recognized by T cells both as part of the development of the repertoire of T cells in the cellular immune system and during activation of cytotoxic T cells. Based on the three-dimensional structure of HLA-B27, we have synthes...

1.1 What is it? Juvenile SpA-ERA constitutes a group of chronic inflammatory diseases of the joints (arthritis), as well as tendon and ligament attachments to certain bones (enthesitis) and affects predominantly the lower limbs and in some cases the pelvic and spinal joints (sacroiliitis buttock pain and spondylitis back pain). Juvenile SpA-ERA is significantly more common in people that have a...

background: it has been arguedthat unprecedented degree of human leukocyte antigen (hla) loci polymorphism within a population is requiredto avoid the devastating effects of infectious diseases. the present study was conducted to determine the associations between some of hla classi genes and the outcome of hepatitis b virus (hbv) infection.   methods: using sequential sampling method, 64 indiv...

CD4 Th cells producing the proinflammatory cytokine IL-17 (Th17) have been implicated in a number of inflammatory arthritides including the spondyloarthritides. Th17 development is promoted by IL-23. Ankylosing spondylitis, the most common spondyloarthritis (SpA), is genetically associated with both HLA-B27 (B27) and IL-23R polymorphisms; however, the link remains unexplained. We have previousl...

We proposed that the killer cell Ig-like receptor KIR3DL2 binding more strongly to HLA-B27 (B27) β2-microglobulin free H chain (FHC) dimers than other HLA-class I molecules regulates lymphocyte function in arthritis and infection. We compared the function of B27 FHC dimers with other class I H chains and identified contact residues in KIR3DL2. B27 FHC dimers interacted functionally with KIR3DL2...

Chlamydia trachomatis is an obligate intracellular pathogen. Infection of susceptible individuals with this bacterium can trigger the development of reactive arthritis, an acute inflammation that is associated with the expression of the class I major histocompatibility antigen, HLA-B27. Other facultative intracellular pathogens, such as Yersinia and Salmonella spp., are also known triggers of r...