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*
Medical Department I, Klinikum Benjamin Franklin, Freie Universität Berlin, Berlin, Germany;
Department of Immunology, Deutsches Rheuma Forschungszentrum Berlin, Berlin, Germany;
Department of Biochemistry, Institute for Biochemistry, Charité, Berlin, Germany;
Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom; and
¶ Institute for Anthropology and Human Genetics, Ludwig Maximilians Universität München, Munich, Germany
The association of HLA-B27 with ankylosing spondylitis and reactive arthritis is the strongest one known between an MHC class I Ag and a disease. We have searched the proteome of the bacterium Chlamydia trachomatis for HLA-B27 binding peptides that are stimulatory for CD8+ cells both in a model of HLA-B27 transgenic mice and in patients. This was done by combining two biomathematical computer programs, the first of which predicts HLA-B27 peptide binding epitopes, and the second the probability of HLA-B27 peptide generation by the proteasome system. After preselection, immunodominant peptides were identified by Ag-specific flow cytometry. Using this approach we have identified for the first time nine peptides derived from different C. trachomatis proteins that are stimulatory for CD8+ T cells. Eight of these nine murine-derived peptides were recognized by cytotoxic T cells. The same strategy was used to identify B27-restricted chlamydial peptides in three patients with reactive arthritis. Eleven peptides were found to be stimulatory for patient-derived CD8+ T cells, of which eight overlapped those found in mice. Additionally, we applied the tetramer technology, showing that a B27/chlamydial peptide containing one of the chlamydial peptides stained CD8+ T cells in patients with Chlamydia-induced arthritis. This comprehensive approach offers the possibility of clarifying the pathogenesis of B27-associated diseases.
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