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Current Microbiology

, Volume 63, Issue 2, pp 131–137 | Cite as

Analysis of Escherichia coli Isolated from Patients Affected by Crohn’s Disease

  • Tiziana Raso
  • Sabrina Crivellaro
  • Maria Gabriella Chirillo
  • Paolo Pais
  • Ezio Gaia
  • Dianella Savoia
Article

Abstract

The etiopathogenesis of Crohn’s disease (CD) is still controversial: several genetic, immunologic, and environmental factors, including some bacteria, have been implicated. This study has been devised to assess the involvement of Escherichia coli in CD. Seven E. coli strains were isolated from 14 biopsies obtained from ileocolic ulcers of patients affected by inflammatory bowel disease (IBD), including six with ulcerative colitis and eight with CD. Five strains, exclusively isolated from CD patients, were found inside mucosal cells. Different PCR techniques (for chuA, yjaA, TspE4.C2, escV, and bfpB genes) were performed and PFGE was carried out to characterize these bacteria in comparison with other E. coli strains isolated from non-IBD specimens. The correlation of these characters with bacterial invasiveness on intestinal (Caco-2) and phagocytic (U937) cells was assessed. Overall our pilot data suggest that five among eight strains isolated from CD patients belonged to the adherent-invasive E. coli (AIEC) group, and were invasive on Caco-2 cells and resistant to phagocytosis. These findings suggest that these bacteria could be considered target organisms whose elimination could reduce the intestinal inflammatory process and CD progression.

Keywords

Inflammatory Bowel Disease Ulcerative Colitis Irritable Bowel Syndrome Confocal Laser Endomicroscopy Bioptic Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

This study was partly supported by a grant from Piedmont Region (2008 bis).

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Tiziana Raso
    • 1
  • Sabrina Crivellaro
    • 1
  • Maria Gabriella Chirillo
    • 2
  • Paolo Pais
    • 3
  • Ezio Gaia
    • 3
  • Dianella Savoia
    • 1
  1. 1.Department of Clinical and Biological Sciences, Faculty of Medicine S. Luigi GonzagaUniversity of Torino, S. Luigi Gonzaga HospitalOrbassanoItaly
  2. 2.Laboratory S. Luigi Gonzaga HospitalOrbassanoItaly
  3. 3.Division of GastroenterologyS. Luigi Gonzaga HospitalOrbassanoItaly

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