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KMID : 0923620130130030086
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Immune Network
2013 Volume.13 No. 3 p.86 ~ p.93
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Priming of Autoreactive CD8＋ T Cells Is Inhibited by Immunogenic Peptides Which Are Competitive for Major Histocompatibility Complex Class I Binding
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You Soo-Seong
Choi Yoon-Seok
Hong Seok-Chan
Shin Eui-Cheol
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Abstract
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In the present study, we investigated if priming of autoreactive CD8＋ T cells would be inhibited by competitive peptides for major histocompatibility complex (MHC) class I binding. We used a mouse model of vitiligo which is induced by immunization of Kb-binding tyrosinase-related protein 2 (TRP2)-180 peptide. Competitive peptides for Kb binding inhibited IFN-?production and proliferation of TRP2-180- specific CD8＋ T cells upon ex vivo peptide restimulation, while other MHC class I-binding peptides did not. In mice, the capability of inhibition was influenced by T-cell immunogenicity of the competitive peptides. The competitive peptide with a high T-cell immunogenicity efficiently inhibited priming of TRP2-180-specific CD8＋ T cells in vivo, whereas the competitive peptide with a low T-cell immunogenicity did not. Taken together, the inhibition of priming of autoreactive CD8＋ T cells depends on not only competition of peptides for MHC class I binding but also competitive peptide-specific CD8＋ T cells, suggesting that clonal expansion of autoreactive T cells would be affected by expansion of competitive peptide-specific T cells. This result provides new insights into the development of competitive peptides-based therapy for the treatment of autoimmune diseases.
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KEYWORD
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Autoimmune disease, Autoreactive CD8＋ T cell, Competitive peptide, Major histocompatibility complex class I
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