PMID- 18242222 OWN - NLM STAT- MEDLINE DCOM- 20080214 LR - 20220408 IS - 1528-0012 (Electronic) IS - 0016-5085 (Linking) VI - 134 IP - 2 DP - 2008 Feb TI - Microbial influences in inflammatory bowel diseases. PG - 577-94 LID - 10.1053/j.gastro.2007.11.059 [doi] AB - The predominantly anaerobic microbiota of the distal ileum and colon contain an extraordinarily complex variety of metabolically active bacteria and fungi that intimately interact with the host's epithelial cells and mucosal immune system. Crohn's disease, ulcerative colitis, and pouchitis are the result of continuous microbial antigenic stimulation of pathogenic immune responses as a consequence of host genetic defects in mucosal barrier function, innate bacterial killing, or immunoregulation. Altered microbial composition and function in inflammatory bowel diseases result in increased immune stimulation, epithelial dysfunction, or enhanced mucosal permeability. Although traditional pathogens probably are not responsible for these disorders, increased virulence of commensal bacterial species, particularly Escherichia coli, enhance their mucosal attachment, invasion, and intracellular persistence, thereby stimulating pathogenic immune responses. Host genetic polymorphisms most likely interact with functional bacterial changes to stimulate aggressive immune responses that lead to chronic tissue injury. Identification of these host and microbial alterations in individual patients should lead to selective targeted interventions that correct underlying abnormalities and induce sustained and predictable therapeutic responses. FAU - Sartor, R Balfour AU - Sartor RB AD - Department of Medicine, Center for Gastrointestinal Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA. rbs@med.unc.edu LA - eng GR - P30 DK34987/DK/NIDDK NIH HHS/United States GR - P40 RR018603/RR/NCRR NIH HHS/United States GR - R01 DK40249/DK/NIDDK NIH HHS/United States GR - R01 DK53347/DK/NIDDK NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Review PL - United States TA - Gastroenterology JT - Gastroenterology JID - 0374630 SB - IM MH - Animals MH - Bacterial Infections/etiology MH - Disease Models, Animal MH - Humans MH - Immunity, Mucosal/immunology/*physiology MH - Inflammatory Bowel Diseases/complications/*microbiology/*physiopathology MH - Intestinal Mucosa/immunology/microbiology/physiopathology MH - Mice MH - Rats RF - 213 EDAT- 2008/02/05 09:00 MHDA- 2008/02/15 09:00 CRDT- 2008/02/05 09:00 PHST- 2007/09/28 00:00 [received] PHST- 2007/11/28 00:00 [accepted] PHST- 2008/02/05 09:00 [pubmed] PHST- 2008/02/15 09:00 [medline] PHST- 2008/02/05 09:00 [entrez] AID - S0016-5085(07)02157-9 [pii] AID - 10.1053/j.gastro.2007.11.059 [doi] PST - ppublish SO - Gastroenterology. 2008 Feb;134(2):577-94. doi: 10.1053/j.gastro.2007.11.059.