Multiple susceptibility (Idd) genes contribute to T cell mediated autoimmune type 1 diabetes (T1D) in both humans and NOD mice, but with particular MHC haplotypes providing the primary risk factor. While also present in many non-autoimmune prone strains, the H2g7 MHC haplotype encoded Kd and/or Db class I molecules play an essential diabetogenic role when expressed in NOD mice. The overall goal of this project continues to be determination of the immunogenetic basis for the aberrant generation of diabetogenic MHC class I dependent CD8 T cells in NOD mice, with the hope such knowledge could ultimately provide translational information for blocking development of similar effectors in humans at high future disease risk. In NOD mice the H2g7 class I gene products aberrantly lose ability to mediate the intrathymic negative selection of diabetogenic CD8 T cells. A currently unknown polymorphic gene(s) within the Idd7 locus plays a major interactive role in determining whether H2g7 class I restricted diabetogenic CD8 T cells undergo negative selection. Hence, specific aim 1 is to more finely map, functionally characterize, and potentially identify the Idd7 region gene(s) regulating the negative selection efficiency of diabetogenic CD8 T cells. There is now also compelling evidence in humans that when expressed in the right genetic context, certain quite common MHC class I variants, such as HLA-A2.1, aberrantly contribute to T1D development. Supporting this situation is our finding that NOD. ?2mnull.HHD mice expressing human HLA-A2.1, but no murine MHC class I molecules, continue to develop T1D. This was not a generic function of any human class I variant transgenically expressed in NOD mice. Previous work identified a series of pancreatic ? cell derived peptides that are presented by HLA-A2.1 class I molecules to diabetogenic CD8 T cells in NOD. ?2mnull.HHD mice. T1D protective tolerance can be induced to pancreatic ? cell peptides that are presented by H2g7 class I molecules in standard NOD mice through appropriated dosed injections into young pre-disease state recipients. Diabetogenic CD8 T cells in standard NOD mice also undergo negative selection if forced to mature in the presence of engrafted antigen presenting cells (APC) expressing some non-H2g7 MHC haplotypes.
Specific aim 2 will determine if diabetogenic HLA-A2.1 restricted T cell responses in NOD. ?2mnull.HHD mice can be attenuated by a potentially tolerogenic peptide administration or APC engraftment protocol. In the currently available NOD. ?2mnull.HHD stock only murine T cell receptor (TCR) molecules can engage antigens presented by the human HLA-A2.1 class I variant. Because of their respective human or murine origin, the TCR molecules expressed by diabetogenic HLA-A2.1 restricted T cells in T1D patients and NOD.?2mnull.HHD mice might vary in their antigen binding affinities, which in turn could result in differential selection and/or activation effects. Thus, specific aim 3 is to functionally characterize NOD.22mnull.HHD mice transgenically expressing a human T1D patient derived TCR that recognizes a known HLA-A2.1 restricted pancreatic ss cell autoantigen.
Type 1 diabetes (T1D) is a life threatening disease that results from an aberrant T lymphocyte mediated autoimmune response resulting in destruction of insulin producing cells in the pancreas. The goal of this current renewal application is to determine, through a series of mouse models, how a particular population of autoreactive T lymphocytes contributing to T1D aberrantly develop, and identify means that can stop this process. Such information may ultimately identify means that can attenuate the development of similar autoreactive T lymphocytes contributing to T1D in human patients.
|Scheuplein, Felix; Lamont, Deanna J; Poynter, Matthew E et al. (2015) Mouse Invariant Monoclonal Antibody NKT14: A Novel Tool to Manipulate iNKT Cell Function In Vivo. PLoS One 10:e0140729|
|Simecek, Petr; Churchill, Gary A; Yang, Hyuna et al. (2015) Genetic Analysis of Substrain Divergence in Non-Obese Diabetic (NOD) Mice. G3 (Bethesda) 5:771-5|
|Tsaih, S-W; Presa, M; Khaja, S et al. (2015) A locus on mouse chromosome 13 inversely regulates CD1d expression and the development of invariant natural killer T-cells. Genes Immun 16:221-30|
|Presa, Maximiliano; Chen, Yi-Guang; Grier, Alexandra E et al. (2015) The Presence and Preferential Activation of Regulatory T Cells Diminish Adoptive Transfer of Autoimmune Diabetes by Polyclonal Nonobese Diabetic (NOD) T Cell Effectors into NSG versus NOD-scid Mice. J Immunol 195:3011-9|
|Lamont, Deanna; Mukherjee, Gayatri; Kumar, P Rajesh et al. (2014) Compensatory mechanisms allow undersized anchor-deficient class I MHC ligands to mediate pathogenic autoreactive T cell responses. J Immunol 193:2135-46|
|Garabatos, Nahir; Alvarez, Raimon; Carrillo, Jorge et al. (2014) In vivo detection of peripherin-specific autoreactive B cells during type 1 diabetes pathogenesis. J Immunol 192:3080-90|
|Presa, Maximiliano; Ortiz, Angela Zarama; Garabatos, Nahir et al. (2013) Cholera toxin subunit B peptide fusion proteins reveal impaired oral tolerance induction in diabetes-prone but not in diabetes-resistant mice. Eur J Immunol 43:2969-79|
|Mukherjee, Gayatri; Geliebter, Ari; Babad, Jeffrey et al. (2013) DEC-205-mediated antigen targeting to steady-state dendritic cells induces deletion of diabetogenic CD8âº T cells independently of PD-1 and PD-L1. Int Immunol 25:651-60|
|Stolp, Jessica; Chen, Yi-Guang; Cox, Selwyn L et al. (2012) Subcongenic analyses reveal complex interactions between distal chromosome 4 genes controlling diabetogenic B cells and CD4 T cells in nonobese diabetic mice. J Immunol 189:1406-17|
|Lee, Jun Sik; Scandiuzzi, Lisa; Ray, Anjana et al. (2012) B7x in the periphery abrogates pancreas-specific damage mediated by self-reactive CD8 T cells. J Immunol 189:4165-74|
Showing the most recent 10 out of 24 publications