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. 1989 Jul;57(7):1928–1935. doi: 10.1128/iai.57.7.1928-1935.1989

Invasive potential of noncytotoxic enteropathogenic Escherichia coli in an in vitro Henle 407 cell model.

M D Miliotis 1, H J Koornhof 1, J I Phillips 1
PMCID: PMC313822  PMID: 2659527

Abstract

The invasive capacity of 13 enteropathogenic Escherichia coli strains was assessed in vitro in Henle 407 cell culture. Both fluorescent microscopy of infected monolayers stained with acridine orange and electron microscopy revealed the presence of intracellular bacteria. As shown by acridine orange-stained infected monolayers, the number of internalized bacteria increased with time. Monolayers infected for 3 h were treated with antibiotics and either [14C]glutamine or [3H]leucine and incubated for various time intervals, after which the amount of radioactivity present in the washed monolayers was measured. A significant (P less than 0.005) increase in uptake was evident for up to 4 h after the addition of radiolabeled amino acid. This finding was confirmed by an increase in bacterial number in cultured cells and in protein concentration of infected cells with time. None of the South African enteropathogenic E. coli isolates used in these studies produced Vero cytotoxin. These findings demonstrate that, in addition to adherence, cell penetration and intracellular multiplication take place in epithelial cell-derived tissue culture cells infected by enteropathogenic E. coli.

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Selected References

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