Quantification and characterization of mucosa-associated and intracellular Escherichia coli in inflammatory bowel disease.

Abstract:

BACKGROUND:Mucosa-associated Escherichia coli are abundant in inflammatory bowel disease (IBD), but whether these bacteria gain intracellular access within the mucosa is uncertain. If E. coli does gain intracellular access, the contribution of bacterial pathogenicity to this requires further elucidation. This study aimed to quantify and characterize mucosa-associated and intracellular E. coli in patients with IBD and in healthy control subjects (HC). METHODS:Mucosal biopsies from 30 patients with Crohn's disease (CD), 15 with ulcerative colitis (UC), and 14 HC were cultured with or without gentamicin protection to recover intracellular or mucosa-associated E. coli, respectively. Overall, 40 strains (CD: n = 24, UC: n = 9, and HC: n = 7) were characterized by phylogenetic typing, adhesion and invasion assays, detection of virulence factors, antimicrobial resistance genes, and proteomic analysis. RESULTS:Mucosa-associated E. coli were more abundant in CD and UC than in HC (2750 versus 1350 versus 230 median colony-forming units per biopsy; P = 0.01). Intracellular E. coli were more prevalent in CD (90%) than in UC (47%) or HC mucosal biopsies (0%) (P < 0.001). Of 24 CD strains, 2 were adherent and invasive, but there were no unifying pathogenicity determinants that could distinguish most CD strains from UC or HC strains, or intracellular isolates from mucosa-associated isolates. CONCLUSIONS:Intracellular E. coli are more common in CD than in UC and not identified in HC. Most intracellular E. coli did not have characterizing pathogenic features, suggesting a significant role for defects in mucosal immunity or barrier dysfunction in their ability to gain intracellular access.

journal_name

Inflamm Bowel Dis

authors

Elliott TR,Hudspith BN,Wu G,Cooley M,Parkes G,Quiñones B,Randall L,Mandrell RE,Fagerquist CK,Brostoff J,Rayment NB,Boussioutas A,Petrovska L,Sanderson JD

doi

10.1097/MIB.0b013e3182a38a92

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

2326-38

issue

11

eissn

1078-0998

issn

1536-4844

journal_volume

19

pub_type

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