PMID- 30574151 OWN - NLM STAT- MEDLINE DCOM- 20191025 LR - 20200309 IS - 1664-3224 (Electronic) IS - 1664-3224 (Linking) VI - 9 DP - 2018 TI - Intestinal Dendritic Cells in Health and Gut Inflammation. PG - 2883 LID - 10.3389/fimmu.2018.02883 [doi] LID - 2883 AB - Dendritic cells (DCs) mediate tolerance to food antigens, limit reactivity to the gut microbiota and are required for optimal response to intestinal pathogens. Intestinal DCs are heterogeneous but collectively generate both regulatory and effector T cell responses. The balance of outcomes is determined by the activity of functionally distinct DC subsets and their modulation by environmental cues. DCs constantly sample luminal content to monitor for pathogens; the significance of the various pathways by which this occurs is incompletely understood. Intestinal DC have distinctive properties shaped by local host, dietary and microbial signals. These properties include the ability to produce all-trans retinoic acid (RA) and imprint gut tropism on T cells they activate. In the steady-state, subsets of intestinal DC are potent generators of inducible Treg, aided by their ability to activate TGFbeta and produce RA. However, responses induced by steady-state intestinal DCs are not exclusively regulatory in nature; effector T cells with specificity for commensal bacterial can be found in the healthy mucosa and these can be locally controlled to prevent inflammation. The ability of intestinal DCs to enhance effector responses in infection or sustain inflammation in disease is likely to involve both modulation of the local DC population and recruitment of additional populations. Immune pathways in the pathogenesis of inflammatory bowel disease can be mapped to DCs and in inflamed intestinal tissue, DCs show increased expression of microbial recognition machinery, activation, and production of key immunological mediators. Intestinal DCs may be targeted for disease therapy or to improve vaccine responses. FAU - Stagg, Andrew J AU - Stagg AJ AD - Centre for Immunobiology, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20181206 PL - Switzerland TA - Front Immunol JT - Frontiers in immunology JID - 101560960 RN - 0 (Allergens) RN - 0 (Immunologic Factors) RN - 0 (Transforming Growth Factor beta) RN - 5688UTC01R (Tretinoin) SB - IM MH - Allergens/immunology MH - Animals MH - Cell Communication/*immunology MH - Colitis/*immunology/microbiology MH - Dendritic Cells/*immunology/metabolism MH - Disease Models, Animal MH - Food Hypersensitivity/immunology MH - Gastrointestinal Microbiome/immunology MH - Humans MH - *Immunity, Mucosal MH - Immunologic Factors/immunology/metabolism MH - Intestinal Mucosa/cytology/*immunology/metabolism/microbiology MH - Intraepithelial Lymphocytes/immunology/metabolism MH - T-Lymphocytes, Cytotoxic/immunology/metabolism MH - T-Lymphocytes, Regulatory/immunology/metabolism MH - Transforming Growth Factor beta/immunology/metabolism MH - Tretinoin/immunology/metabolism PMC - PMC6291504 OTO - NOTNLM OT - Dendritic cells OT - antigen sampling OT - inflammatory bowel disease OT - intestinal inflammation OT - lymphocyte homing EDAT- 2018/12/24 06:00 MHDA- 2019/10/28 06:00 PMCR- 2018/01/01 CRDT- 2018/12/22 06:00 PHST- 2018/07/13 00:00 [received] PHST- 2018/11/23 00:00 [accepted] PHST- 2018/12/22 06:00 [entrez] PHST- 2018/12/24 06:00 [pubmed] PHST- 2019/10/28 06:00 [medline] PHST- 2018/01/01 00:00 [pmc-release] AID - 10.3389/fimmu.2018.02883 [doi] PST - epublish SO - Front Immunol. 2018 Dec 6;9:2883. doi: 10.3389/fimmu.2018.02883. eCollection 2018.