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SFB 633:  Induction and Modulation of T cell Mediated Immune Responses in the Gastrointestinal Tract

Subject Area Medicine
Term from 2003 to 2015
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 5485888
 
Final Report Year 2015

Final Report Abstract

The immune system of the gastrointestinal tract has a unique position since it represents the largest interface of the human body. The associated exposure to a multitude of microorganisms – mostly harmless and beneficial commensals - requires a differential reaction towards these microrganisms as well as food antigens in contrast to pathogens. Hence, the balance in between tolerance and inflammatory reactions is pivotal for the gastrointestinal tract. Thus it is not surprising that inflammatory bowel diseases, besides allergies, not only belong to the most abundant immune-mediated diseases but furthermore that the experimental interference with numerous regulatory pathways results in intestinal inflammation that translated to more than 50 animal models for intestinal inflammation. Accordingly, localization, development, and composition of immune cells in the intestine, development of lymphatic structures, reactivity and functional specialization, homing and life cycle of cells are unique. Nowhere else, but in the mucosal immune system architecture, function and systemic impact depend on the interaction with the complex microbiota. The main goal of the SFB633 was to elucidate these interactions in an interdisciplinary approach. The PI of the projects provided a profound expertise in three main areas: i) in the biology of T cells in terms of specialized effector cells playing a central role as versatile regulators for the reactivity of the mucosal immune system, ii) in the analysis and modulation of the intestinal microbiota, acknowledging them as essential reaction partners and stimulators for the physiology and pathology of the mucosal immune system, and iii) in the clinical representation of inflammatory diseases and infections of the gastrointestinal tract, but also of other organ systems corresponding to mucosal reactions. This unique combination not only allowed for introducing novel methods and concepts for the analysis of the complex system of gastrointestinal immune reactions, but was also instrumental in translating the findings into new strategies for the therapy of chronic-inflammatory diseases and for the protection from infectious diseases.

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