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The Journal of Immunology, Vol 148, Issue 10 3004-3011, Copyright © 1992 by American Association of Immunologists
ARTICLES |
DB Crumpacker, J Alexander, P Cresswell and VH Engelhard
Department of Microbiology, University of Virginia, Charlottesville 22908.
One model to explain the high frequency of alloreactive T cells proposes that allogeneic MHC molecules are recognized together with host cell-derived peptides. A model system was developed to investigate the relevance of this mechanism by expression of H-2Dd or H-2Ld in 174xCEM.T2 (T2) cells. This human cell line contains a mutation in its Ag-processing pathway that should restrict the association of endogenous peptides with cell surface class I molecules. CTL generated by stimulating C57BL/6 (H-2b) responder cells with H-2Dd or H-2Ld transfectants of the human B cell line C1R or the murine T cell lymphoma EL4 were assayed for their ability to recognize alloantigenic determinants on these transfectants. The major fraction of the H-2Dd- specific allogeneic CTL response, generated in a MLC or under clonal limiting dilution conditions, was composed of T cells that recognized H- 2Dd expressed on C1R or EL4 cells, but failed to recognize this molecule on T2 cells. Clonal analysis indicated that approximately one- third of these CTL recognized determinants that were unique to H-2Dd expressed on C1R stimulator cells whereas the remainder recognized determinants that were also found on EL4 transfectants. Less than 10% of H-2Dd-reactive CTL recognized the T2 transfectant, and these clones also killed C1R-Dd and EL4-Dd. This result suggests that the great majority of H-2Dd-specific alloreactive CTL recognize determinants that are formed by a complex of H-2Dd with endogenous peptides that are absent or significantly reduced in T2 cells. Based on recognition of human or murine transfectants, these CTL exhibit some level of specificity for the structure or composition of the bound peptides. Examination of allogeneic CTL specific for H-2Ld revealed populations similar to those described for H-2Dd. In addition, a major new population was present that recognized determinants shared between C1R- Ld and T2-Ld but not present on EL4-Ld. These results are consistent with the idea that the alloreactive response to H-2Ld is also largely dependent on the presence of bound peptide. However, they also may indicate that the H-2Ld molecule expressed on T2 cells is occupied by one or more peptides that are shared with other human, but not murine, cells. The significance of these results to current models of alloreactivity is discussed.
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