T lymphocytes known as type 1 or invariant NKT cells (iNKT cells) recognize specific lipid ligands presented by the CD1d protein, and this component of the CD1-dependent immune response is highly conserved between humans and mice. Many detailed studies in mouse models have shown that iNKT cells contribute to immune responses against pathogens, elimination of malignant tumors, maintenance of immunological tolerance and prevention of autoimmune diseases. Great progress in understanding and potentially harnessing the many immunological activities of iNKT cells has been made in recent years as a result of the identification of various forms of synthetic a-galactosylceramide (aGalCer) that specifically activate these cells. The current proposal is focused on the identification of modified forms of aGalCer that activate different cytokine patterns when used to stimulate mouse or human iNKT cells. Numerous Th2-cytokine biasing forms of aGalCer have been identified in our ongoing studies, and we propose new synthetic approaches to create additional aGalCer analogues that will include examples with tolerogenic or proinflammatory activities based on cytokine production or other effects. These compounds will be characterized in detail using assay systems to analyze both mouse and human iNKT cell responses to identify those that are most suitable to carry forward into translational studies. Using new monoclonal antibody reagents specific for CD1d/aGalCer complexes, and soluble iNKT cell antigen receptors, we will carry out a range of studies to determine the mechanisms that lead to the stimulation of markedly different patterns of cytokines by various aGalCer analogues. Studies to optimize the adjuvant properties of selected aGalCer analogues in model systems of vaccination are also proposed. These studies will increase our understanding of the mechanisms governing the regulation of the many potential activities of iNKT cells, and will contribute to development of therapeutic applications for glycolipid activators of this T cell subset.
This project will develop chemical compounds that specifically activate a specialized subset of T lymphocytes known as iNKT cells. These T cells have the ability to either stimulate or suppress immune responses, depending on how they are activated. The studies put forth in this proposal will identify compounds that selectively activate either the stimulatory or suppressive functions of iNKT cells, which will lead to the ability to more precisely control the functions of these cells for the prevention or treatment of human disease. The potential range of applications for iNKT cell activators is very broad and includes their use as drugs for prevention of autoimmune diseases such as type 1 diabetes or multiple sclerosis, as well as their incorporation into new vaccines for infections and cancer.
|Chennamadhavuni, Divya; Saavedra-Avila, Noemi Alejandra; Carreño, Leandro J et al. (2018) Dual Modifications of ?-Galactosylceramide Synergize to Promote Activation of Human Invariant Natural Killer T Cells and Stimulate Anti-tumor Immunity. Cell Chem Biol 25:571-584.e8|
|Wang, Y; Sedimbi, S; Löfbom, L et al. (2018) Unique invariant natural killer T cells promote intestinal polyps by suppressing TH1 immunity and promoting regulatory T cells. Mucosal Immunol 11:131-143|
|Chandra, Shilpi; Gray, James; Kiosses, William B et al. (2018) Mrp1 is involved in lipid presentation and iNKT cell activation by Streptococcus pneumoniae. Nat Commun 9:4279|
|Kunnath-Velayudhan, Shajo; Porcelli, Steven A (2018) Isolation of intact RNA from murine CD4+ T cells after intracellular cytokine staining and fluorescence-activated cell sorting. J Immunol Methods 456:77-80|
|Trujillo-Ocampo, Abel; Cho, Hyun-Woo; Herrmann, Amanda C et al. (2018) Rapid ex vivo expansion of highly enriched human invariant natural killer T cells via single antigenic stimulation for cell therapy to prevent graft-versus-host disease. Cytotherapy 20:1089-1101|
|Carreño, Leandro J; Saavedra-Ávila, Noemí A; Porcelli, Steven A (2016) Synthetic glycolipid activators of natural killer T cells as immunotherapeutic agents. Clin Transl Immunology 5:e69|
|Arora, Pooja; Porcelli, Steven A (2016) An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets. J Vis Exp :e53824|
|Arora, Pooja; Kharkwal, Shalu S; Ng, Tony W et al. (2016) ""Endocytic pH regulates cell surface localization of glycolipid antigen loaded CD1d complexes"". Chem Phys Lipids 194:49-57|
|Wen, Xiangshu; Kim, Seil; Xiong, Ran et al. (2015) A Subset of CD8??+ Invariant NKT Cells in a Humanized Mouse Model. J Immunol 195:1459-69|
|Birkholz, Alysia M; Girardi, Enrico; Wingender, Gerhard et al. (2015) A Novel Glycolipid Antigen for NKT Cells That Preferentially Induces IFN-? Production. J Immunol 195:924-33|
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