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Molecular mimicry: Any role in the pathogenesis of spondyloarthropathies?

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Abstract

Ankylosing spondylitis and reactive arthritis are seronegative spondyloarthropathies, which are strongly associated with HLA-B27. Despite intensive investigation, the basis for this association is not clear. However, in recent years one favored hypothesis to explain this linkage has been that of molecular mimicry, i.e., sharing of linear or conformational epitopes common to microbial antigens and host structures. During the past few years several examples of molecular mimicry between HLA-B27 and microbial antigens have been described. Heat shock proteins, among others, have been considered as target candidates for autoimmune phenomena, because of the high degree of homology between bacterial and mammalian species. Reactive arthritis triggered byYersinia orSalmonella provides a unique model for studying the pathogenetic mechanisms underlying human inflammatory joint diseases in general, because the arthritogenic microbes are known and well-characterized. We have described two bacterial proteins that share amino acid homology with HLA-B27, namely YadA (Yersinia adhesin) and OmpH, outer surface proteins ofYersinia andSalmonella, respectively. Notably, the area of identity of these amino acid sequences is located in the same place on the HLA-B27 molecule as a hexapeptide identical betweenKlebsiella nitrogenase and HLA-B27, and a pentapeptide shared by aShigella flexneri protein and HLA-B27. We have investigated immune responses to a panel of synthetic peptides based on the HLA-B27-homologous portions of pathogen-specific antigens in patients with reactive arthritis and ankylosing spondylitis. One third of the patients have antibodies to the synthetic peptides. However, instead of recognizing the HLA-B27-homologous portion, the antibodies are directed against the flanking sequences of the synthetic peptides. The concept of the role of molecular mimicry between HLA-B27 and microbial antigens in the pathogenesis of spondyloarthropathies is discussed, with a conclusion that no convincing evidence for its significance exists at the present.

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  1. Department of Medical Microbiology, Turku University, FIN-20520, Turku, Finland

    Riitta Lahesmaa, Mikael Skurnik & Padvo Toivanen

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  1. Riitta Lahesmaa
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Lahesmaa, R., Skurnik, M. & Toivanen, P. Molecular mimicry: Any role in the pathogenesis of spondyloarthropathies?. Immunol Res 12, 193–208 (1993). https://doi.org/10.1007/BF02918304

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