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    Two plasmid-encoded genes of enteropathogenic Escherichia coli strain K798 promote invasion and survival within HEp-2 cells

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    Publication date
    2014
    Author
    Burska, Urszula L.
    Fletcher, Jonathan N.
    Keyword
    Cell line; Tumor; Enteropathogenic Escherichia coli; Humans; Escherichia coli proteins; Humans; Plasmids; Virulence; Epec; HEp-2 cells; PecM; TniA2; Invasion
    Peer-Reviewed
    Yes
    
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    Abstract
    Enteropathogenic Escherichia coli (EPEC) are considered to be extracellular pathogens, inducing attaching and effacing lesions following their attachment to the surface of eukaryotic cells; however, in vitro and in vivo invasion by EPEC has been reported in several studies. A cloned 4.6 kb fragment of EPEC plasmid pLV501 has been shown to facilitate invasion of E. coli K-12, and here we further investigate the nature of this process. Two of the three complete open reading frames contained within the plasmid fragment have been cloned to E. coli, and in HEp-2 adherence assays both tniA2 and pecM were shown to be expressed during the first 3 h of infection from a plac promoter. Escherichia coli transformants carrying pecM alone or in combination with tniA2 were able to both survive intracellularly and escape eukaryotic cells to re-establish themselves within the medium, whereas those bacterial cells carrying tniA2 alone could not be isolated from within HEp-2 cells after 24 h of infection, but were present in the previously sterile medium surrounding the cells. Bacteria carrying pecM and tniA2 adhered to HEp-2 cells with sites of adhesion characterized by underlying actin polymerization. The invasive potential conferred by these genes may give EPEC strains a survival advantage during prolonged infection.
    URI
    http://hdl.handle.net/10454/10431
    Version
    No full-text available in the repository
    Citation
    Burska UL and Fletcher JN (2014) Two plasmid-encoded genes of enteropathogenic Escherichia coli strain K798 promote invasion and survival within HEp-2 cells. APMIS. 122(10): 922-930.
    Link to publisher’s version
    https://doi.org/10.1111/apm.12234
    Type
    Article
    Collections
    Life Sciences Publications

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