Abstract
The intestinal epithelium forms a highly active functional interface between the relatively sterile internal body surfaces and the enormously complex and diverse microbiota that are contained within the lumen. Genetic models that allow for manipulation of genes specifically in the intestinal epithelium have provided an avenue to understand the diverse set of pathways whereby intestinal epithelial cells (IECs) direct the immune state of the mucosa associated with homeostasis versus either productive or non-productive inflammation as occurs during enteropathogen invasion or inflammatory bowel disease (IBD), respectively. These pathways include the unfolded protein response (UPR) induced by stress in the endoplasmic reticulum (ER), autophagy, a self-cannibalistic pathway important for intracellular bacterial killing and proper Paneth cell function as well as the interrelated functions of NOD2/NF-κB signaling which also regulate autophagy induction. Multiple genes controlling these IEC pathways have been shown to be genetic risk factors for human IBD. This highlights the importance of these pathways not only for proper IEC function but also suggesting that IECs may be one of the cellular originators of organ-specific and systemic inflammation as in IBD.
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Acknowledgments
Work in the authors’ laboratories is supported by NIH RO1 grants DK44319, DK51362, DK53056 and DK08819 (R.S.B.), Innsbruck Medical University (MFI 2007-407, A.K.), the Austrian Science Fund and Ministry of Science P21530 and START Y446 (A.K.), the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant agreement no. 260961 (A.K.) and the National Institute for Health Research Cambridge Biomedical Research Centre (A.K.).
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Kaser, A., Niederreiter, L. & Blumberg, R.S. Genetically determined epithelial dysfunction and its consequences for microflora–host interactions. Cell. Mol. Life Sci. 68, 3643–3649 (2011). https://doi.org/10.1007/s00018-011-0827-y
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DOI: https://doi.org/10.1007/s00018-011-0827-y