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- W2048702747 abstract "Autoantibodies to soluble liver antigen and liver pancreas (SLA/LP) have been described as specific markers for Autoimmune Hepatitis (AIH), occurring in about 20% of patients with AIH. The high degree of specificity for SLA/LP in autoimmune liver disease suggests a possible role in its pathogenesis. This study aims to map the exact epitope(s) recognized by SLA/LP autoantibodies and to assess the role of molecular mimicry between microbial antigens and self-epitopes. Using SLA/LP-reactive sera of 18 individual AIH patients and a pool of 15 patient sera, we found the dominant immune reactivity directed to peptide p395-414 and a less prominent immune response to 2 other epitopes adjacent to the dominant epitope. Immunodominance of peptide p395-414 was confirmed by absorption experiments. The SLA/LP autoantibodies of all tested AIH patients were mainly of the IgG1 type, suggesting that SLA/LP autoantibodies may arise by a common and specific underlying immune stimulus. Based on sequence homologies of the SLA/LP antigenic region with viral proteins, it was hypothesized that molecular mimicry may drive autoimmunity to SLA/LP. However, the homologous virus-derived peptides were not recognized by SLA/LP autoantibodies. Similarly, the only known procaryotic homologue, MJ0610 of Methanococcus jannaschii, was only weakly recognized by SLA/LP-positive sera. Thus, no evidence could be found for molecular mimicry being the causative mechanism for the development of SLA/LP autoantibodies. In conclusion, the exquisite epitope specificity and IgG subtype are evidence for the maturity of the SLA/LP autoantibody response; a specific autoantigen-driven process underlying the immunopathogenesis is likely." @default.
- W2048702747 created "2016-06-24" @default.
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- W2048702747 date "2002-02-01" @default.
- W2048702747 modified "2023-10-02" @default.
- W2048702747 title "Fine specificity of autoantibodies to soluble liver antigen and liver/pancreas" @default.
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- W2048702747 doi "https://doi.org/10.1053/jhep.2002.30699" @default.
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