نتایج جستجو برای: b27 subtypes
تعداد نتایج: 41930 فیلتر نتایج به سال:
The human leukocyte Ag HLA-B27 (B27) is strongly associated with the spondyloarthritides. B27 can be expressed at the cell surface of APC as both classical β2-microglobulin-associated B27 and B27 free H chain forms (FHC), including disulfide-bonded H chain homodimers (termed B27(2)). B27 FHC forms, but not classical B27, bind to KIR3DL2. HLA-A3, which is not associated with spondyloarthritis (S...
The structure of a variant HLA-B27 antigen, B27.2, that is distinguished from the HLA-B27.1 and HLA-B27.3 subgroups by specific cytolytic T lymphocytes has been established by comparative peptide mapping and sequence analysis. There are only three amino acid substitutions between B27.1 and B27.2: aspartate-77, threonine-80, and leucine-81 in HLA-B27.1 are changed to asparagine-77, isoleucine-80...
مقدمه: آنتی ژن های لکوسیتی انسان 1 (HLA) به دلیل وجود ارتباط بین برخی آلل های HLA با بیماریهای مختلف، در ارزیابی استعداد ابتلا به بیماریها و کمک به تشخیص آنها اهمیت دارند. بر اساس بسیاری از تحقیقات انجام شده در سراسر دنیا، قویترین این ارتباطات بین آنتی ژن HLA-B27 و اسپوندیلوآرتروپاتیها، بخصوص اسپوندیلیت آنکیلوزانت (جمود التهابی مهره های کمری ستون فقرات)، وجود دارد. هدف از این تحقیق...
OBJECTIVE The intracellular persistence of viable Chlamydia trachomatis (CT) within the joint is thought to initiate and maintain the inflammatory process in CT-induced arthritis. CT-induced arthritis is associated with HLA-B27. Recently it was shown that HLA-B27, besides being a T-cell restriction element, can directly influence the invasion and/or replication of enterobacteriae and alters sal...
Cytotoxic T lymphocytes, induced by stimulating the PBMC of an HLA-B27+ normal individual (B27+, AS-) with the PBMC of an HLA-identical sibling suffering from ankylosing spondylitis (AS) (B27+, AS+), specifically lyse B27+, AS+ PBMC but not PBMC from HLA-27+ or B27-, AS- normal controls, or from HLA-B27- AS patients (B27-,AS+). CTL of similar specificity can also be raised by immunizing in vitr...
Although association of HLA-B27 with human spondyloarthropathies has been known for several years, its role in disease pathogenesis is not understood. Recently, a few investigators have proposed that presentation of B27-derived peptides by MHC class II molecules may be the underlying mechanism. HLA-B27 transgenic rat and mouse models have provided a new tool for understanding the exact role of ...
There is a strong association between seronegative arthritis and HLA B27, but it is still unresolved whether the contribution of B27 to disease pathogenesis is solely as a restriction element for an arthritogenic peptide, or whether B27 itself serves as an autoantigen. This study uses transgenic rats to address the question as to whether exposure to an arthritogenic pathogen can alter tolerance...
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