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• W2806236052 abstract "Crohn’s disease (CD), characterized by discontinuous intestinal injury and inflammation, has been associated with changes in luminal microbial composition and impaired barrier function. The relationships between visual features of intestinal injury, permeability, and the mucosa-associated microbiota are unclear. Individuals undergoing routine colonoscopy (controls) and patients with CD were evaluated by clinical parameters and confocal laser scanning endomicroscopic colonoscopy (CLE). Patients with CD were categorized as either CD with no injury (CD-NI) or CD with injury (CD-I). Colonic biopsies were taken from adjacent matched sites in all individuals, and CLE images from these sites were analyzed for vascular permeability. Microbial composition was evaluated by 16S rRNA gene sequencing of the V3 region, and the mycome was identified through internal transcribed spacer 2 sequencing. Subgroup analyses were performed for histology, paracellular permeability (Ussing chamber), and encroachment of bacteria (fluorescent in situ hybridization). CD-I patients showed an altered microbial community compared with both controls and CD-NI patients, with enrichment in Escherichia and a decrease in Firmicutes, including Lachnospira, Faecalibacterium, and Blautia. In CD-I patients, bacterial encroachment to host epithelial cells was greater in sites of injury than in matched biopsy sites. Biopsies from sites of injury also demonstrated greater vascular and paracellular permeability. Overall, CD-I patients showed an altered mucosal microbial community compared with CD-NI patients and controls. Matched biopsy samples in CD-I patients revealed that sites of injury, identified endoscopically, are characterized by increased encroachment of bacteria to host epithelial cells, associated with increased paracellular and vascular permeability, which may drive inflammation in CD. NEW & NOTEWORTHY Patients with Crohn’s disease (CD) with areas of colonic injury have an altered microbial community compared with patients who have no endoscopic evidence of injury or active disease. Although matched biopsies from patients with colonic injury show no differences in the mucosa-associated microbiota, injured sites are associated with increased permeability and increased encroachment. Our results support the notion that dysbiotic communities within patients with colonic injury cause or permit disruption of the mucosal and endothelial layers in CD." @default.
• W2806236052 created "2018-06-13" @default.
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• W2806236052 date "2018-09-01" @default.
• W2806236052 modified "2023-10-01" @default.
• W2806236052 title "Inflammation-related differences in mucosa-associated microbiota and intestinal barrier function in colonic Crohn’s disease" @default.
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• W2806236052 doi "https://doi.org/10.1152/ajpgi.00411.2017" @default.
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