Differences in Gut Microbiota in Patients With vs Without Inflammatory Bowel Diseases: A Systematic Review.

Published on Mar 1, 2020in Gastroenterology22.682
· DOI :10.1053/J.GASTRO.2019.11.294
Rapat Pittayanon17
Estimated H-index: 17
(McMaster University),
Jennifer T. Lau8
Estimated H-index: 8
(McMaster University)
+ 4 AuthorsPaul Moayyedi117
Estimated H-index: 117
(McMaster University)
Sources
Abstract
Abstract Background & Aims Altering the intestinal microbiota has been proposed as a treatment for inflammatory bowel diseases (IBD), but there are no established associations between specific microbes and IBD. We performed a systematic review to identify frequent associations. Methods We searched the MEDLINE, EMBASE, Cochrane CDSR, and CENTRAL databases, through April 2, 2018 for studies that compared intestinal microbiota (from fecal or colonic or ileal tissue samples) among patients (adult or pediatric) with IBD vs healthy individuals (controls). The primary outcome was difference in specific taxa in fecal or intestinal tissue samples from patients with IBD vs controls. We used the Newcastle-Ottawa scale to assess the quality of studies included in the review. Results We identified 2631 citations; 48 studies from 45 articles were included in the analysis. Most studies evaluated adults with Crohn’s disease or ulcerative colitis. All 3 studies of Christensenellaceae and Coriobacteriaceae and 6 of 11 studies of Faecalibacterium prausnitzii reported a decreased amount of those organisms compared with controls, whereas 2 studies each of Actinomyces, Veillonella, and Escherichia coli revealed an increased amount in patients with Crohn’s disease. For patients with ulcerative colitis, Eubacterium rectale and Akkermansia were decreased in all 3 studies whereas E coli was increased in 4 of 9 studies. The microbiota diversity was either decreased or not different in patients with IBD vs controls. Fewer than 50% of the studies stated comparable sexes and ages of cases and controls. Conclusions In a systematic review, we found evidence for differences in abundances of some bacteria in patients with IBD vs controls, but we cannot make conclusions due to inconsistent results and methods among studies. Further large-scale studies, with better methods of assessing microbe populations, are needed
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References71
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Background & Aims Irritable bowel syndrome (IBS) is common but difficult to treat. Altering the gut microbiota has been proposed as a strategy for treatment of IBS, but the association between the gut microbiome and IBS symptoms has not been well established. We performed a systematic review to explore evidence for this association. Methods We searched databases, including MEDLINE, EMBASE, Cochrane CDSR, and CENTRAL, through April 2, 2018 for case–control studies comparing the fecal or colon mic...
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Intestinal microbiome dysbiosis has been consistently described in patients with IBD. In the last decades, Escherichia coli , and the adherent-invasive E coli (AIEC) pathotype in particular, has been implicated in the pathogenesis of IBD. Since the discovery of AIEC, two decades ago, progress has been made in unravelling these bacteria characteristics and its interaction with the gut immune system. The mechanisms of adhesion of AIEC to intestinal epithelial cells (via FimH and cell adhesion mole...
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