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The Journal of Immunology, Vol 156, Issue 7 2473-2480, Copyright © 1996 by American Association of Immunologists
ARTICLES |
MH Newberg, DH Smith, SB Haertel, DR Vining, E Lacy and VH Engelhard
Department of Microbiology, University of Virginia, Charlottsville, 22908, USA.
The importance of the species of different domains of class I MHC molecules in peripheral T cell recognition and positive and negative selection was evaluated in a single system. In transgenic mice expressing AAD (containing the alpha1+alpha2 domains of HLA-A2.1 and the alpha3 domain of H-2Dd), the CTL response to influenza peptide M1(58-66) in the context of the alpha1+alpha2 domains of HLA-A2.1 was as strong as the influenza-specific H-2Db-restricted response. However, this strong response was only discernible if the target cell MHC molecule also contained a murine alpha3 domain. In contrast, the response in HLA-A2.1 transgenic mice was about 30-fold weaker, and these CTL were indifferent to the origin of the target molecule alpha3 domain. Further analysis suggested that the major impact of the murine alpha3 domain of the transgene product was to enhance positive selection of a low affinity population of AAD-restricted T cells, presumably through species-specific interaction with CD8. Surprisingly, the response to non-self human class I MHC determinants was not augmented in AAD mice, indicating that the T cells selected are narrowly focused on AAD-related structures. Further analysis indicated that the alphal+alpha2 domains as well as the alpha3 domain influenced the magnitude of the response to non-self human class I MHC determinants, and this effect was mapped to alpha2. We suggest that the alpha2 domains of murine class I molecules contain conserved structural elements that augment the avidity of T cell-class I interactions, and this is particularly important in the recognition of non-self MHC molecules.
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