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- W2008049771 abstract "Background. The immune mechanisms by which corneal allografts are rejected in normal ocular graft beds have not been identified. Both acceptors and rejectors of these types of grafts display donor-specific delayed hypersensitivity and in vitro proliferating primed T cells, yet neither develop conventional, donor-specific cytotoxic T cells. We wished to determine whether unconventional donor-specific cytotoxic T cells are generated in rejector mice that recognize donor minor alloantigens presented by recipient major histocompatibility complex (MHC) molecules. Methods. BALB/c mice received orthotopic corneal allografts from C57BL/10 donors in normal eyes. At 4 weeks (when 50% of grafts can be designated as rejected), primed cytotoxic T lymphocyte (CTL) activity in draining lymph nodes and spleen was assayed on targets selected to present donor-type minor H antigens on recipient MHC molecules. Control mice received heterotopic corneal allografts and were similarly examined. Results. Lymphoid organs of recipients that rejected orthotopic or heterotopic corneal allografts contained CTL that lysed targets expressing donor-type minor H antigens presented by recipient MHC molecules. By contrast, no CTL activity was detected from lymphoid cells of recipients that accepted orthotopic corneal allografts. Rejection of orthotopic corneal allografts placed into normal mouse eyes correlates directly with the generation of donor-specific CTL that recognize minor H antigens in the context of recipients MHC molecules. Conclusions. These results indicate the indirect pathway of alloantigen presentation is the only pathway operative in the process by which orthotopic corneal allografts are rejected. The roles of emigrant Langerhans cells and corneal lymphatics in the indirect pathway are discussed." @default.
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- W2008049771 date "1999-10-01" @default.
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- W2008049771 title "DETECTION OF MINOR ALLOANTIGEN-SPECIFIC CYTOTOXIC T CELLS AFTER REJECTION OF MURINE ORTHOTOPIC CORNEAL ALLOGRAFTS" @default.
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- W2008049771 doi "https://doi.org/10.1097/00007890-199910150-00011" @default.
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