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• W2004582912 abstract "Molecular mimicry between microbial antigens and host tissue is suggested as a mechanism for post-infectious autoimmune disease. In the present work we describe the autoimmune reactions of two severe rheumatic heart disease (RHD) patients, through an analysis of heart-infiltrating T-cell repertoire, antigen recognition, and cytokine production induced by specific antigens. T-cell clones derived from oligoclonally expanded T cells in the heart cross-recognized M5 peptides, heart tissue-derived proteins, and myosin peptides. We show, using binding affinity assays, that an immunodominant streptococcal peptide (M5(81-96)) is capable of binding to the HLA-DR53 molecule. The same peptide was recognized by an infiltrating T-cell clone from a patient carrying HLA-DR15, DR7, and DR53 molecules. This suggests that this peptide is probably presented to T cells in the context of the HLA-DR53 molecule. Cross-reactive heart-infiltrating T cells activated by the M5 protein and its peptides and by heart tissue-derived proteins produced predominantly inflammatory cytokines. Interleukin (IL)-4 was produced in small amounts by mitral valve intralesional T-cell lines and clones. Altogether, these results suggest that mimicry between streptococcal antigens and heart-tissue proteins, combined with high inflammatory cytokine and low IL-4 production, leads to the development of autoimmune reactions and cardiac tissue damage in RHD patients." @default.
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• W2004582912 date "2005-03-01" @default.
• W2004582912 modified "2023-09-26" @default.
• W2004582912 title "How an autoimmune reaction triggered by molecular mimicry between streptococcal M protein and cardiac tissue proteins leads to heart lesions in rheumatic heart disease" @default.
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• W2004582912 doi "https://doi.org/10.1016/j.jaut.2005.01.007" @default.
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