Abstract
The aryl hydrocarbon receptor (AHR) is widely expressed in immune and non-immune cells of the gut and its activation has been correlated to the outcome of inflammatory bowel diseases (IBD). In ulcerative colitis and Crohn’s disease, there is an excessive chronic inflammation with massive accumulation of leukocytes in the gut, in an attempt to constrain the invasion of pathogenic microorganisms on the damaged organ. Accordingly, it is known that dietary components, xenobiotics, and some chemicals or metabolites can activate AHR and induce the modulation of inflammatory responses. In fact, the AHR triggering by specific ligands during inflammatory conditions results in decreased IFNγ, IL-6, IL-12, TNF, IL-7, and IL-17, along with reduced microbial translocation and fibrosis in the gut. Moreover, upon AHR activation, there are increased regulatory mechanisms such as IL-10, IL-22, prostaglandin E2, and Foxp3, besides the production of anti-microbial peptides and epithelial repair. Most interestingly, commensal bacteria or their metabolites may also activate this receptor, thus contributing to the restoration of gut normobiosis and homeostasis. In line with that, Lactobacillus reuteri, Lactobacillus bulgaricus, or microbial products such as tryptophan metabolites, indole-3-pyruvic acid, urolithin A, short-chain fatty acids, dihydroxyquinoline, and others may regulate the inflammation by mechanisms dependent on AHR activation. Hence, here we discussed the potential modulatory role of AHR on intestinal inflammation, focused on the reestablishment of homeostasis through the receptor triggering by microbial metabolites. Finally, the development of AHR-based therapies derived from bacteria products could represent an important future alternative for controlling IBD.
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We would like to acknowledge the financial agencies and the Biosciences and Biotechnology Post Graduation Program from the Faculty of Pharmaceutical Sciences of Ribeirão Preto at the University of São Paulo that supported this work.
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This work was supported by CAPES financial code 001, CNPq (310174/2016-3) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2017/08651.1).
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LP designed and wrote the review; MDS wrote and discussed the work; CRBC wrote, discussed, and reviewed the manuscript.
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Pernomian, L., Duarte-Silva, M. & de Barros Cardoso, C.R. The Aryl Hydrocarbon Receptor (AHR) as a Potential Target for the Control of Intestinal Inflammation: Insights from an Immune and Bacteria Sensor Receptor. Clinic Rev Allerg Immunol 59, 382–390 (2020). https://doi.org/10.1007/s12016-020-08789-3
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DOI: https://doi.org/10.1007/s12016-020-08789-3