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Infection and Immunity logoLink to Infection and Immunity
. 1994 Aug;62(8):3494–3505. doi: 10.1128/iai.62.8.3494-3505.1994

Distinct binding properties of eaeA-negative verocytotoxin-producing Escherichia coli of serotype O113:H21.

M T Dytoc 1, A Ismaili 1, D J Philpott 1, R Soni 1, J L Brunton 1, P M Sherman 1
PMCID: PMC302983  PMID: 7518809

Abstract

Infection of humans with verotoxin-producing Escherichia coli (VTEC) O113:H21 is associated with clinical features comparable to those associated with infection with attaching and effacing VTEC strains including those of serotype O157:H7. We have shown previously that the adhesion phenotype of VTEC O157:H7 is influenced by the presence of a homolog of the chromosomal eaeA (for E. coli attaching and effacing) gene. In contrast, by colony blot hybridization, VTEC O113:H21 is negative for the eaeA gene. Therefore, the aim of this study was to define the adhesion phenotype of VTEC O113:H21 strain CL-15 to both cultured epithelial cells (HEp-2) and rabbit intestine in vivo. Under transmission electron microscopy, areas of microvillus effacement were observed in regions directly beneath the organism in CL-15-infected cells both in vitro and in vivo. However, F-actin adhesion pedestals on the host plasma membrane were absent. Failure of CL-15 to induce polymerization of actin was confirmed by using staining of F-actin with fluorescein-labeled phalloidin. Under indirect immunofluorescence microscopy, CL-15-infected HEp-2 cells also failed to demonstrate the recruitment of another cytoskeletal element, alpha-actinin, below foci of bacterial adhesion. In contrast, VTEC O157:H7 infection of HEp-2 cells was associated with increased alpha-actinin immunofluorescence. These findings suggest that bacterial factors distinct from those of EaeA are necessary for the adhesion phenotype of VTEC O113:H21.

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Selected References

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