Commensal Escherichia coli Strains of Bovine Origin Competitively Mitigated Escherichia coli O157:H7 in a Gnotobiotic Murine Intestinal Colonization Model with or without Physiological Stress

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DOI

https://doi.org/10.3390/ani13162577

Language of the publication
English
Date
2023-08-10
Type
Article
Author(s)
  • Lange, Maximo E.
  • Clarke, Sandra T.
  • Boras, Valerie F.
  • Brown, Catherine L. J.
  • Zhang, Guangzhi
  • Laing, Chad R.
  • Uwiera, Richard R. E.
  • Montina, Tony
  • Kalmokoff, Martin L.
  • Taboada, Eduardo N.
  • Gannon, Victor P. J.
  • Metz, Gerlinde A. S.
  • Church, John S.
  • Inglis, G. Douglas
Publisher
Multidisciplinary Digital Publishing Institute (MDPI)

Abstract

Cattle are a primary reservoir of enterohemorrhagic Escherichia coli (EHEC) O157:H7. Currently, there are no effective methods of eliminating this important zoonotic pathogen from cattle, and colonization resistance in relation to EHEC O157:H7 in cattle is poorly understood. We developed a gnotobiotic EHEC O157:H7 murine model to examine aspects of the cattle pathogen-microbiota interaction, and to investigate competitive suppression of EHEC O157:H7 by 18 phylogenetically distinct commensal E. coli strains of bovine origin. As stress has been suggested to influence enteric colonization by EHEC O157:H7 in cattle, corticosterone administration (±) to incite a physiological stress response was included as an experimental variable. Colonization of the intestinal tract (IT) of mice by the bovine EHEC O157:H7 strain, FRIK-2001, mimicked characteristics of bovine IT colonization. In this regard, FRIK-2001 successfully colonized the IT and temporally incited minimal impacts on the host relative to other EHEC O157:H7 strains, including on the renal metabolome. The presence of the commensal E. coli strains decreased EHEC O157:H7 densities in the cecum, proximal colon, and distal colon. Moreover, histopathologic changes and inflammation markers were reduced in the distal colon of mice inoculated with commensal E. coli strains (both propagated separately and communally). Although stress induction affected the behavior of mice, it did not influence EHEC O157:H7 densities or disease. These findings support the use of a gnotobiotic murine model of enteric bovine EHEC O157:H7 colonization to better understand pathogen-host-microbiota interactions toward the development of effective on-farm mitigations for EHEC O157:H7 in cattle, including the identification of bacteria capable of competitively colonizing the IT.

Subject

  • Health

Keywords

  • calf model,
  • competitive exclusion,
  • germ-free,
  • gut,
  • mouse

Rights

Peer review

Yes

Open access level

Gold

Identifiers

PubMed ID
37627368
ISSN
2076-2615
Other
PMC10451813

Article

Journal title
Animals
Journal volume
13
Journal issue
16
Article number
2577

Citation(s)

Lange, M. E., Clarke, S. T., Boras, V. F., Brown, C. L. J., Zhang, G., Laing, C. R., Uwiera, R. R. E., Montina, T., Kalmokoff, M. L., Taboada, E. N., Gannon, V. P. J., Metz, G. A. S., Church, J. S., & Inglis, G. D. (2023). Commensal Escherichia coli Strains of Bovine Origin Competitively Mitigated Escherichia coli O157:H7 in a Gnotobiotic Murine Intestinal Colonization Model with or without Physiological Stress. Animals: an open access journal from MDPI, 13(16), 2577. https://doi.org/10.3390/ani13162577

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Collection(s)

Communicable diseases

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