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. 1994 Jan;62(1):41–47. doi: 10.1128/iai.62.1.41-47.1994

Epithelial cell invasion by bovine septicemic Escherichia coli.

M J Korth 1, J C Lara 1, S L Moseley 1
PMCID: PMC186065  PMID: 7903284

Abstract

Little is known regarding the pathogenesis of Escherichia coli-induced septicemic colibacillosis of calves. To understand the mechanism by which these strains penetrate the intestinal epithelium and gain access to the bloodstream, we examined the potential of bovine septicemic E. coli to invade cultured epithelial cells. By using a gentamicin survival assay, we demonstrated bacterial invasion of Madin-Darby canine kidney (MDCK) cells. Transcytosis of polarized MDCK cell monolayers was also observed, but only when bacteria were added to the basolateral surface. Electron microscopy confirmed the presence of intracellular organisms which appeared to be within membrane-bound vacuoles. The bovine septicemic isolate used in this study expressed the fimbrial adhesion CS31A. To examine the role of CS31A-mediated adherence in invasion and transcytosis of MDCK cell monolayers, a CS31A-deficient mutant was constructed by suicide vector-mediated insertional mutagenesis. Although nonadherent, the mutant showed a level of invasion similar to that of the wild-type parent. E. coli DH5 alpha carrying the cloned CS31A determinant was noninvasive. These findings suggest that expression of CS31A is neither required nor sufficient to mediate invasion.

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Selected References

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