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. 1997 Apr;65(4):1408–1413. doi: 10.1128/iai.65.4.1408-1413.1997

Effect of carbon source on localized adherence of enteropathogenic Escherichia coli.

R P Vanmaele 1, G D Armstrong 1
PMCID: PMC175147  PMID: 9119481

Abstract

Enteropathogenic Escherichia coli (EPEC) strains attach to epithelial cells as discrete clusters of bacteria which are localized at a few sites on the cell surface. Previously, it was shown that this localized-adherence (LA) phenotype is induced by specific growth conditions. We found that wild-type EPEC attached to HEp-2 cells in an LA pattern when the bacteria were grown in Dulbecco's modified Eagle medium (DMEM) containing glucose as the carbon source. In contrast, bacteria incubated in DMEM containing galactose did not adhere to epithelial cells. The latter results were similar to those observed when JPN15, an LA-negative strain, was grown under conditions which promoted bacterial binding. The differences in attachment of wild-type EPEC were independent of the stage of log-phase growth of the cultures and of the number of CFU incubated with the HEp-2 monolayers. Expression of the adherence phenotype by organisms grown in glucose was associated with increased expression of intimin and bundle-forming pilin. In contrast, bacteria grown in medium containing galactose expressed these proteins at levels similar to those observed when JPN15 was grown in medium containing glucose.

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Selected References

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