Insulin is an important target antigen in type 1 diabetes and a useful model antigen for ancilysis of mechanisms in antigen presentation and immune regulation. In this competing renewal application we propose experiments to further investigate antigen- prccessing mechanisms for presentation of insulin to T cells. We have identified T cells that recognize insulin presented by the nonclassical MHC class I molecule Qa-1. A major foe as of the proposal is to characterize the function of Qa-1 an its role in the immune response to insulin.
The specific aims are 1) to investigate the role of endosomal proteins in mediating disulfide reduction and antigen unfolding during antigen processing, 2) to analyze the peptide-binding behavior of the MHC class Ib molecule, Qa-1, 3) to characterize the determinant and investigate the pathway used by Qa-1-restricted T cells to recognize insulin, and 4) to investigate selection and function of insulin-specific, Qa-1- res :ricted T cells using TCR transgenic mice. This research is expected to broaden our general understanding of antigen processing and immune responses to insulin, as well as the function of Qa-1 and its human homolog, HLA-E.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Method to Extend Research in Time (MERIT) Award (R37)
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Special Emphasis Panel (NSS)
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Bourcier, Katarzyna
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University of Utah
Schools of Medicine
Salt Lake City
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Chen, Lili; Reyes-Vargas, Eduardo; Dai, Hu et al. (2014) Expression of the mouse MHC class Ib H2-T11 gene product, a paralog of H2-T23 (Qa-1) with shared peptide-binding specificity. J Immunol 193:1427-39
Gu, Yapeng; Jensen, Peter E; Chen, Xinjian (2013) Immunodeficiency and autoimmunity in H2-O-deficient mice. J Immunol 190:126-37
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Jay, David C; Reed-Loisel, Lisa M; Jensen, Peter E (2008) Polyclonal MHC Ib-restricted CD8+ T cells undergo homeostatic expansion in the absence of conventional MHC-restricted T cells. J Immunol 180:2805-14
Chen, Xinjian; Reed-Loisel, Lisa M; Karlsson, Lars et al. (2006) H2-O expression in primary dendritic cells. J Immunol 176:3548-56
Reed-Loisel, Lisa M; Sullivan, Barbara A; Laur, Oskar et al. (2005) An MHC class Ib-restricted TCR that cross-reacts with an MHC class Ia molecule. J Immunol 174:7746-52
Kambayashi, Taku; Kraft-Leavy, Jennifer R; Dauner, Joseph G et al. (2004) The nonclassical MHC class I molecule Qa-1 forms unstable peptide complexes. J Immunol 172:1661-9
Madakamutil, Loui T; Christen, Urs; Lena, Christopher J et al. (2004) CD8alphaalpha-mediated survival and differentiation of CD8 memory T cell precursors. Science 304:590-3

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