CD Id-restricted T cells (or """"""""iNKT cells"""""""") have been reported to regulate an extremely diverse set of immunologic responses and diseases. Dysfunction including cytokine secretion by these T cells is clearly correlated with the development of autoimmunity, and in particular autoimmune diabetes. Despite the importance of CD Id-restricted T cells in this disease, how these T cells function normally and the exact nature of the disease-associated defects remains unclear. In this regard, potential regulatory functions that would be predicted to have significant impact on type 1 diabetes include recently described critical interactions of CD Id-restricted T cells with dendritic cells and the activation-induced secretion of Thl and Th2 cytokines. Th2 cytokine secretion by CD Id-restricted T cells has been associated with protection from autoimmune diabetes in murine models. Conversely, CD Id-restricted T cells cloned from patients with type 1 diabetes were found, amongst other defects, to have an extreme Thl cytokine bias. Recent work has demonstrated that in normal human volunteers, the CD4+ CD Id-restricted subset is responsible for Th2 cytokine production in vivo, whereas the CD4- (or """"""""DN"""""""") subset were strongly biased towards the secretion of Thl cytokines and expressed greater levels of proteins with cytotoxic function. Recently we found that people at risk for type 1 diabetes have a significant increase in the DN subset. Importantly, we have also identified factors secreted by CD4+ but not by DN iNKT cells that positively regulate DC differentiation. Defective maturation of myeloid DC is thought to be a significant cellular defect related to diabetes risk. Hence, CD4+ iNKT cells might serve to prevent progression to diabetes whilst DN iNKT cells might promote pro-inflammatory responses. To test the hypothesis of distinct effector function for these two subsets we propose to compare diabetes patients, at risk donors, and control donors in the following specific aims:
Aim 1. Analyses of CDld-restricted T frequency and function.
Aim 2. Characterization of dendritic cell differentiation factor(s) secreted by CD4+ iNKT cells Aim 3. Molecular analysis of the requirements for co-receptor function during APC-dependent activation and formation of the immunologic synapse.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI045051-07
Application #
7052877
Study Section
Hypersensitivity, Autoimmune, and Immune-mediated Diseases Study Section (HAI)
Program Officer
Ridge, John P
Project Start
1999-04-01
Project End
2009-12-31
Budget Start
2006-01-01
Budget End
2006-12-31
Support Year
7
Fiscal Year
2006
Total Cost
$394,994
Indirect Cost
Name
Massachusetts General Hospital
Department
Type
DUNS #
073130411
City
Boston
State
MA
Country
United States
Zip Code
02199
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Arrizabalaga, Gustavo; Ruiz, Felix; Moreno, Silvia et al. (2004) Ionophore-resistant mutant of Toxoplasma gondii reveals involvement of a sodium/hydrogen exchanger in calcium regulation. J Cell Biol 165:653-62
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