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Research Article

Enteropathogenic Escherichia coli decreases the transepithelial electrical resistance of polarized epithelial monolayers.

C Canil, I Rosenshine, S Ruschkowski, M S Donnenberg, J B Kaper, B B Finlay
C Canil
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I Rosenshine
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S Ruschkowski
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M S Donnenberg
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J B Kaper
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B B Finlay
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ABSTRACT

The mechanisms whereby enteropathogenic Escherichia coli (EPEC) causes diarrhea remain undefined. We found that EPEC caused a decrease in transepithelial electrical resistance across polarized monolayers of Caco-2 and MDCK epithelial cells. This occurred approximately 6 to 10 h after bacterial addition and was reversible if the monolayers were treated with tetracycline or gentamicin. Although significant alterations in host actin occurred beneath adherent EPEC, actin filaments supporting tight junctions were not noticeably affected in the epithelial cells, nor was the distribution of ZO-1, a tight junction protein. Despite the decrease in transepithelial electrical resistance, EPEC did not cause an increase in [3H]inulin penetration across MDCK monolayers. Unlike in the parental strain, mutations in any loci involved in adherence or formation of attaching and effacing lesions were unable to cause a decrease in transepithelial resistance. These data indicate that EPEC causes a decrease in transepithelial electrical resistance by disrupting a transcellular (intracellular) pathway rather than by disrupting intercellular tight junctions (paracellular) and that these disruptions occur only when attaching and effacing lesions are formed.

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Enteropathogenic Escherichia coli decreases the transepithelial electrical resistance of polarized epithelial monolayers.
C Canil, I Rosenshine, S Ruschkowski, M S Donnenberg, J B Kaper, B B Finlay
Infection and Immunity Jul 1993, 61 (7) 2755-2762; DOI:

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Enteropathogenic Escherichia coli decreases the transepithelial electrical resistance of polarized epithelial monolayers.
C Canil, I Rosenshine, S Ruschkowski, M S Donnenberg, J B Kaper, B B Finlay
Infection and Immunity Jul 1993, 61 (7) 2755-2762; DOI:
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