Fachbereich Veterinärmedizin



    Age-Dependent Susceptibility to Enteropathogenic Escherichia coli (EPEC) Infection in Mice (2016)

    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Dupont, Aline
    Sommer, Felix
    Zhang, Kaiyi
    Repnik, Urska
    Basic, Marijana
    Bleich, André
    Kühnel, Mark
    Bäckhed, Fredrik
    Litvak, Yael
    Fulde, Marcus (WE 7)
    Rosenshine, Ilan
    Hornef, Mathias W
    PLoS Pathogens; 12(5) — S. e1005616
    ISSN: 1553-7366
    DOI: 10.1371/journal.ppat.1005616
    Pubmed: 27159323
    Institut für Mikrobiologie und Tierseuchen

    Robert-von-Ostertag-Str. 7-13
    Gebäude 35
    14163 Berlin
    +49 30 838 51840 / 51843

    Abstract / Zusammenfassung

    Enteropathogenic Escherichia coli (EPEC) represents a major causative agent of infant diarrhea associated with significant morbidity and mortality in developing countries. Although studied extensively in vitro, the investigation of the host-pathogen interaction in vivo has been hampered by the lack of a suitable small animal model. Using RT-PCR and global transcriptome analysis, high throughput 16S rDNA sequencing as well as immunofluorescence and electron microscopy, we characterize the EPEC-host interaction following oral challenge of newborn mice. Spontaneous colonization of the small intestine and colon of neonate mice that lasted until weaning was observed. Intimate attachment to the epithelial plasma membrane and microcolony formation were visualized only in the presence of a functional bundle forming pili (BFP) and type III secretion system (T3SS). Similarly, a T3SS-dependent EPEC-induced innate immune response, mediated via MyD88, TLR5 and TLR9 led to the induction of a distinct set of genes in infected intestinal epithelial cells. Infection-induced alterations of the microbiota composition remained restricted to the postnatal period. Although EPEC colonized the adult intestine in the absence of a competing microbiota, no microcolonies were observed at the small intestinal epithelium. Here, we introduce the first suitable mouse infection model and describe an age-dependent, virulence factor-dependent attachment of EPEC to enterocytes in vivo.