BACKGROUND & AIMS: Although multiple studies have focused on Helicobacter pylori, little is known about the mucosa-associated flora of the colon. The aim of this study was to detect bacteria directly in colonic mucosa from patients screened for colorectal cancer. METHODS: Bacteria were quantified with the polymerase chain reaction and identified by comparative sequence analysis in colonoscopic biopsy specimens from 31 asymptomatic and 34 symptomatic controls with normal colonoscopic findings, 29 patients with colonic adenoma, and 31 patients with colorectal carcinoma. In 41 patients, intra- and extracellular location of bacteria was confirmed with the gentamicin protection assay. RESULTS: No bacteria were detected in biopsy specimens from 97% of asymptomatic and 69% of symptomatic controls. In contrast, bacterial concentrations of 10(3)-10(5) colony-forming units per microliter were detected in biopsy specimens from both malignant and macroscopically normal tissue in 90% and 93% of patients with adenoma and carcinoma, respectively. E. coli and coli-like bacteria were shown to colonize the colonic mucosa in 82% of these patients. The gentamicin protection assay indicated that E. coli was partially intracellular in 87% of patients with adenoma and carcinoma and in none of the controls. CONCLUSIONS: The colonic mucosa of patients with colorectal carcinoma but not normal colonic mucosa is colonized by intracellular E. coli.
BACKGROUND & AIMS: Although multiple studies have focused on Helicobacter pylori, little is known about the mucosa-associated flora of the colon. The aim of this study was to detect bacteria directly in colonic mucosa from patients screened for colorectal cancer. METHODS: Bacteria were quantified with the polymerase chain reaction and identified by comparative sequence analysis in colonoscopic biopsy specimens from 31 asymptomatic and 34 symptomatic controls with normal colonoscopic findings, 29 patients with colonic adenoma, and 31 patients with colorectal carcinoma. In 41 patients, intra- and extracellular location of bacteria was confirmed with the gentamicin protection assay. RESULTS: No bacteria were detected in biopsy specimens from 97% of asymptomatic and 69% of symptomatic controls. In contrast, bacterial concentrations of 10(3)-10(5) colony-forming units per microliter were detected in biopsy specimens from both malignant and macroscopically normal tissue in 90% and 93% of patients with adenoma and carcinoma, respectively. E. coli and coli-like bacteria were shown to colonize the colonic mucosa in 82% of these patients. The gentamicin protection assay indicated that E. coli was partially intracellular in 87% of patients with adenoma and carcinoma and in none of the controls. CONCLUSIONS: The colonic mucosa of patients with colorectal carcinoma but not normal colonic mucosa is colonized by intracellular E. coli.
Authors: Vannary Tieng; Chantal Le Bouguénec; Laurence du Merle; Philippe Bertheau; Pierre Desreumaux; Anne Janin; Dominique Charron; Antoine Toubert Journal: Proc Natl Acad Sci U S A Date: 2002-02-05 Impact factor: 11.205
Authors: Oliver von Kampen; Simone Lipinski; Andreas Till; Seamus J Martin; Wilfried Nietfeld; Hans Lehrach; Stefan Schreiber; Philip Rosenstiel Journal: J Biol Chem Date: 2010-04-12 Impact factor: 5.157
Authors: Janelle C Arthur; Ernesto Perez-Chanona; Marcus Mühlbauer; Sarah Tomkovich; Joshua M Uronis; Ting-Jia Fan; Barry J Campbell; Turki Abujamel; Belgin Dogan; Arlin B Rogers; Jonathan M Rhodes; Alain Stintzi; Kenneth W Simpson; Jonathan J Hansen; Temitope O Keku; Anthony A Fodor; Christian Jobin Journal: Science Date: 2012-08-16 Impact factor: 47.728
Authors: S Schreiber; P Rosenstiel; J Hampe; S Nikolaus; B Groessner; A Schottelius; T Kühbacher; J Hämling; U R Fölsch; D Seegert Journal: Gut Date: 2002-09 Impact factor: 23.059