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Thomas Stratmann, Natalia Martin-Orozco, Valérie Mallet-Designe, Laurent Poirot, Dorian McGavern, Grigoriy Losyev, Cathleen M. Dobbs, Michael B.A. Oldstone, Kenji Yoshida, Hitoshi Kikutani, Diane Mathis, Christophe Benoist, Kathryn Haskins, Luc Teyton
J Clin Invest. 2003;
112(6):902
doi:10.1172/JCI18337
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T
o detect and characterize autoreactive T cells in diabetes-prone NOD mice, we have developed a multimeric MHC reagent with high affinity for the BDC-2.5 T cell receptor, which is reactive against a pancreatic autoantigen. A distinct population of T cells is detected in NOD mice that recognizes the same MHC/peptide target. These T cells are positively selected in the thymus at a surprisingly high frequency and exported to the periphery. They are activated specifically in the pancreatic LNs, demonstrating an autoimmune specificity that recapitulates that of the BDC-2.5 cell. These phenomena are also observed in mouse lines that share with NOD the H-2g7 MHC haplotype but carry diabetes-resistance background genes. Thus, a susceptible haplotype at the MHC seems to be the only element required for the selection and emergence of autoreactive T cells, without requiring other diabetogenic loci from the NOD genome.
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