Abstract：
:Enterohemorrhagic Escherichia coli (EHEC) are major food-borne pathogens whose survival and virulence in the human digestive tract remain unclear owing to paucity of relevant models. EHEC interact with the follicle-associated epithelium of Peyer's patches of the distal ileum and translocate across the intestinal epithelium via M-cells, but the underlying molecular mechanisms are still unknown. Here, we investigated the involvement of Long polar fimbriae (Lpf) in EHEC pathogenesis. Of the 236 strains tested, a significant association was observed between the presence of lpf operons and pathogenicity. In sophisticated in vitro models of the human gastro-intestinal tract, lpf expression was induced during transit through the simulated stomach and small intestine, but not in the colonic compartment. To investigate the involvement of Lpf in EHEC pathogenesis, lpf isogenic mutants and their relative trans-complemented strains were generated. Translocation across M-cells, interactions with murine ileal biopsies containing Peyer's patches and the number of hemorrhagic lesions were significantly reduced with the lpf mutants compared to the wild-type strain. Complementation of lpf mutants fully restored the wild-type phenotypes. Our results indicate that (i) EHEC might colonize the terminal ileum at the early stages of infection, (ii) Lpf are an important player in the interactions with Peyer's patches and M-cells, and could contribute to intestinal colonization.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Cordonnier C,Etienne-Mesmin L,Thévenot J,Rougeron A,Rénier S,Chassaing B,Darfeuille-Michaud A,Barnich N,Blanquet-Diot S,Livrelli Vdoi
10.1038/srep44655subject
Has Abstractpub_date
2017-03-20 00:00:00pages
44655issn
2045-2322pii
srep44655journal_volume
7pub_type
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