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Am J Physiol Gastrointest Liver Physiol 275: G564-G571, 1998;
0193-1857/98 $5.00
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Vol. 275, Issue 3, G564-G571, September 1998

Enteroinvasive bacteria directly activate expression of iNOS and NO production in human colon epithelial cells

Thomas Witthöft, Lars Eckmann, Jung Mogg Kim, and Martin F. Kagnoff

Department of Medicine, University of California, San Diego, La Jolla, California 92093-0623

In these studies, we investigated whether bacterial infection of human colon epithelial cells is a sufficient stimulus to upregulate epithelial cell expression of inducible nitric oxide synthase (iNOS) and nitric oxide (NO) production. Human colon epithelial cells (Caco-2 and HT-29) rapidly upregulated iNOS mRNA and protein expression and NO production after infection with enteroinvasive Escherichia coli, Salmonella dublin, or Shigella flexneri but not after infection with noninvasive E. coli or an invasion-deficient mutant of S. dublin. Bacterial infection in the absence of added cytokines was as potent or more potent a stimulus of iNOS expression and NO production as stimulation of cells with combinations of cytokines known to strongly upregulate this epithelial cell response. Enteroinvasive E. coli increased epithelial NO production to a greater extent than S. dublin, although S. dublin was a stronger stimulus of epithelial cell interleukin-8 (IL-8) production. After enteroinvasive E. coli infection of polarized epithelial cell monolayers, nitrite, a stable NO end product, was released predominately into the apical compartment early after infection, whereas IL-8 was released in parallel into the basolateral compartment. These studies suggest NO and/or its redox products are an important component of the intestinal epithelial cell response to microbial infection.

intestinal inflammation; microbial pathogenesis; host response; polarized epithelial cells; Salmonella; Escherichia coli


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