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The Journal of Immunology, 2004, 173: 3103-3111.
Copyright © 2004 by The American Association of Immunologists

Diabetes Incidence Is Unaltered in Glutamate Decarboxylase 65-Specific TCR Retrogenic Nonobese Diabetic Mice: Generation by Retroviral-Mediated Stem Cell Gene Transfer1

Paula Y. Arnold, Amanda R. Burton and Dario A. A. Vignali2

Department of Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105

TCR transgenic mice are valuable tools for dissecting the role of autoantigen-specific T cells in the pathogenesis of type 1 diabetes but are time-consuming to generate and backcross onto congenic strains. To circumvent these limitations, we developed a new approach to rapidly generate mice expressing TCR using retroviral-mediated stem cell gene transfer and a novel picornavirus-like 2A peptide to link the TCR {alpha}- and {beta}-chains in a single retroviral vector. We refer to these as retrogenic (Rg) mice to avoid confusion with conventional transgenic mice. Our approach was validated by demonstrating that Rg nonobese diabetic (NOD)-scid mice expressing the diabetogenic TCRs, BDC2.5 and 4.1, generate clonotype-positive T cells and develop diabetes. We then expressed three TCR specific for either glutamate decarboxylase (GAD) 206–220 or GAD 524–538 or for hen egg lysozyme 11–25 as a control in NOD, NOD-scid, and B6.H2g7 mice. Although T cells from these TCR Rg mice responded to their respective Ag in vitro, the GAD-specific T cells exhibited a naive, resting phenotype in vivo. However, T cells from Rg mice challenged with Ag in vivo became activated and developed into memory cells. Neither of the GAD-reactive TCR accelerated or protected mice from diabetes, nor did activated T cells transfer or protect against diabetes in NOD-scid recipients, suggesting that GAD may not be a primary target for diabetogenic T cells. Generation of autoantigen-specific TCR Rg mice represents a powerful approach for the analysis of a wide variety of autoantigens.




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