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Alloreactive T cells recognize framework or peptide-dependent determinants on foreign MHC molecules. Among the peptide-dependent alloreactive T cells a significant proportion is specific for one particular peptide presented by the allo-MHC molecule as antigen-specific T cells would do. Such alloreactive, peptide-specific T cells are referred to as 'allorestricted'. High-avidity HLA-A*02 allorestricted cytotoxic T lymphocyte (CTL) clones specific for peptide libraries can be generated from HLA-A*02(-) donors. We made use of this technique to study the role of closely related self-HLA molecules on shaping of the alloreactive T cell repertoire. Peripheral blood lymphocytes from HLA-A*0205 individuals were stimulated by HLA-A*0201 targets pulsed with an HLA-A*0201 peptide library. We did not observe a bias towards peptide-specific CTL in the HLA-A*0201-directed alloreactive repertoire of HLA-A*0205 donors as compared to HLA-A*02(-) donors. Comparison of the alloreactive T cell response between two donors having similar HLA haplotypes demonstrated that the allorestricted T cell repertoire is largely different between individuals.

international immunology

The peptide-specific alloreactive human T cell repertoire varies largely between individuals and is not extended in HLA-A*0205–anti-HLA-A*0201 pairings