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MHC Class II-Bound Self Peptides from Autoimmune MRL/lpr Mice Reveal Potential T Cell Epitopes for Autoantibody Production in Murine Systemic Lupus Erythematosus¹

John H. Freed^2,*,, Amy Marrs^*, Jennifer VanderWall^*, Philip L. Cohen and Robert A. Eisenberg

^* Division of Basic Immunology, Department of Medicine, National Jewish Medical and Research Center, Denver, CO 80206; Department of Immunology, University of Colorado Health Sciences Center, Denver, CO 80262; and Division of Rheumatology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104

The systemic lupus erythematosus-like syndrome in MRL/lpr mice involves high-titered IgG autoantibodies, particularly antinuclear Abs that target histones, DNA, and RNA particles. Although T cell help is required for the generation of antinuclear Abs, the epitopes recognized by such helper T cells are unknown. To address this question, we isolated and sequenced self peptides bound by MHC class II molecules from MRL/lpr mice. We identified a number of peptides that are not seen in similar preparations from nonautoimmune C3H animals. The "abnormal" peptide donors include histone, a protein component of a small nuclear ribonucleoprotein, ribosomal proteins, and RNA processing enzymes. We postulate that the peptides from these donors are T cell epitopes required for the generation of the most frequent antinuclear Abs specificities seen in MRL/lpr mice.

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