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In enterobacteria-induced reactive arthritis (ReA), different T cell subsets play a role in the induction and maintenance of the synovitic process. Synovial fluid-derived alphabeta CD4, alphabeta CD8, and gammadelta T lymphocyte clones (TLC) that recognize Yersinia or Salmonella antigens on professional antigen-presenting cells (APC) have been characterized, and T cells themselves can function as nonprofessional APC. T cells were infected with the facultatively intracellular, arthritogenic enterobacterium Yersinia enterocolitica O:3. A CD8 TLC isolated from a patient with Yersinia-induced ReA recognized and efficiently lysed autologous and allogeneic Yersinia-infected T cells. Infected cytotoxic T lymphocytes (CTL) had a reduced lytic capacity against syngeneic and allogeneic infected target cells, suggesting that the infection of CTL by bacteria may represent a mechanism of immune escape. In ReA, antigen presentation by T cells may modify the antibacterial immune response and may also contribute to network control mechanisms of T cell-mediated cytotoxicity.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Enterobacteria‐Infected T Cells as Antigen‐Presenting Cells for Cytotoxic CD8 T Cells: A Contribution to the Self‐Limitation of Cellular Immune Reactions in Reactive Arthritis?