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Shiga toxins decrease enterohaemorrhagic Escherichia coli survival within Acanthamoeba castellanii

Chekabab, Samuel Mohammed; Daigle, France; Charette, Steve J.; Dozois, Charles M.; Harel, Josée (2013). Shiga toxins decrease enterohaemorrhagic Escherichia coli survival within Acanthamoeba castellanii FEMS Microbiology Letters , vol. 344 , nº 1. p. 86-93. DOI: 10.1111/1574-6968.12158.

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Résumé

Enterohaemorrhagic Escherichia coli (EHEC) are zoonotic pathogens transmitted to humans through contaminated water or bovine products. One of the strategies used by pathogenic bacteria to survive in aquatic environments is using free-living amoebae as hosts. Acanthamoeba castellanii is an amoeba known to host several waterborne pathogens. This study investigates the survival of EHEC with A. castellanii, which could contribute to its spread and transmission to humans. We used a gentamicin protection assay as well as fluorescence and electron microscopy to monitor the intra-amoebae survival of EHEC O157:H7 over 24 h. The results showed that EHEC were able to survive within A. castellanii and that this survival was reduced by Shiga toxins (Stx) produced by EHEC. A toxic effect mediated by Stx was demonstrated by amoebae mortality and LDH release during co-culture of EHEC and amoeba. This work describes the ability of EHEC to survive within A. castellanii, and this host-pathogen interaction is partially controlled by the Stx. Thus, this ubiquitous amoeba could represent an environmental niche for EHEC survival and transmission. © 2013 Federation of European Microbiological Societies.

Type de document:
Mots-clés libres: Acanthamoeba castellanii; Cytotoxicity; EHEC O157:H7; Intracellular survival; Shiga toxins
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 16 mai 2017 18:42
Dernière modification: 16 mai 2017 18:42
URI: http://espace.inrs.ca/id/eprint/2877

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