The overarching theme of the current program project grant is to define how the innate immune system informs the adaptive immune system in the intestine and how miscommunication in this interaction results in the development of IBD. Our currently funded grant has a strong emphasis on the role of the lEC in regulating innate and adaptive Immune responses in health and disease. While the epithelial cell will continue to be a prominent focus in this renewal, the data generated thus far have allowed the projects to evolve in the direction of studying the regulation of Th17 responses, a key cell type involved in mucosal inflammation. All projects have aims that involve the use of mouse and human models allowing the investigators to make observations in human tissues that can then be modeled in the mouse and vice versa (results obtained through the study of animal models can be validated by studying human tissues). In the first project the focus is on assessing the role of a newly defined population that expresses both FoxP3 and IL-17 in Crohn's disease tissues and may represent the previously undescribed interface between Tregs and Th17 cells. The second project focuses on the transcription factor associated with Th17 development, ROR?t, by analyzing the contributions of chemokines in driving these cells to the gut (an extension of the previous granting period) and the role that IL23 plays in the development of Th17 mediated inflammation (taking advantage of murine models developed by the PI). The third project also reflects the evolution of studies from the first granting period by studying the role of the transcription facto IRF8 (ICSBP) on Th17 differentiation (acting as a negative regulator of IL17 production and ROR?t function) and its role in IBD pathogenesis. The fourth project is new to this PPG but takes advantage of the growth of mucosal immunology at Mount Sinai. Dr. Julie Blander studies the role of TLR signaling in Th17 responses in vitro and in vivo using infected vs. uninfected apoptic cells including an infection model (C. rodentium). Her studies fit perfectly with the other projects in our program and her participation in the group provides her access to unique resources to study murine and human IBD. At the same time, she provides models (C. rodentium) that will be helpful for the other PPG members. Overall the focus and interactive nature of the program (20 joint publications in 4 years, 3 additional NIH grants on related areas) provide a solid basis for a productive outcome.

Public Health Relevance

The studies detailed in this proposal focus new light on a pathway involved in mediating mucosal inflammation. It has direct relevance to IBD pathogenesis and may add new insights leading to novel therapies. TABLE OF CONTENTS Overall Description 2

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Research Program Projects (P01)
Project #
Application #
Study Section
Special Emphasis Panel (ZDK1-GRB-8 (O1))
Program Officer
Hamilton, Frank A
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Icahn School of Medicine at Mount Sinai
Internal Medicine/Medicine
Schools of Medicine
New York
United States
Zip Code
Chen, L; He, Z; Slinger, E et al. (2015) IL-23 activates innate lymphoid cells to promote neonatal intestinal pathology. Mucosal Immunol 8:390-402
Kent, Andrew; Blander, J Magarian (2014) Nod-like receptors: key molecular switches in the conundrum of cancer. Front Immunol 5:185
Bongers, Gerold; Pacer, Michelle E; Geraldino, Thais H et al. (2014) Interplay of host microbiota, genetic perturbations, and inflammation promotes local development of intestinal neoplasms in mice. J Exp Med 211:457-72
Sicherer, Scott H; Wood, Robert A; Vickery, Brian P et al. (2014) The natural history of egg allergy in an observational cohort. J Allergy Clin Immunol 133:492-9
Caubet, Jean-Christoph; Masilamani, Madhan; Rivers, Neisha A et al. (2014) Potential non-T cells source of interleukin-4 in food allergy. Pediatr Allergy Immunol 25:243-9
Moretti, Julien; Blander, J Magarian (2014) Insights into phagocytosis-coupled activation of pattern recognition receptors and inflammasomes. Curr Opin Immunol 26:100-10
Blander, J Magarian (2014) A long-awaited merger of the pathways mediating host defence and programmed cell death. Nat Rev Immunol 14:601-18
Davenport, Michael; Poles, Jordan; Leung, Jacqueline M et al. (2014) Metabolic alterations to the mucosal microbiota in inflammatory bowel disease. Inflamm Bowel Dis 20:723-31
Hammerich, Linda; Bangen, Jörg M; Govaere, Olivier et al. (2014) Chemokine receptor CCR6-dependent accumulation of ?? T cells in injured liver restricts hepatic inflammation and fibrosis. Hepatology 59:630-42
Manganaro, Lara; Pache, Lars; Herrmann, Tobias et al. (2014) Tumor suppressor cylindromatosis (CYLD) controls HIV transcription in an NF-?B-dependent manner. J Virol 88:7528-40

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