PMID: 11340099May 8, 2001Paper

Elevated iron status increases bacterial invasion and survival and alters cytokine/chemokine mRNA expression in Caco-2 human intestinal cells

The Journal of Nutrition
S L FosterM L Failla

Abstract

Iron status affects both microbial growth and immune function. Mammalian iron homeostasis is maintained primarily by regulating the absorption of the micronutrient in the proximal small intestine. The iron concentration of the enterocyte can fluctuate widely in response to both dietary and whole body iron status, as well as in response to infections. The possibility that an enterocyte with an elevated iron concentration is more susceptible to invasion by enteric pathogens is not known. Therefore, we examined the impact of enterocyte iron status on the invasion and survival of an enteric pathogen, as well as on the levels of several cytokine and chemokine mRNAs by the host cell. The enterocyte-like Caco-2 human intestinal cell line and Salmonella enteritidis served as the models to examine the effect of iron on the host-parasite interaction. Iron status of Caco-2 cells was altered by incubation in serum-free medium supplemented with varying levels of iron. Elevated iron status of Caco-2 cells increased the efficiency of the invasion and the number of bacteria surviving in the intracellular environment. Caco-2 cells constitutively expressed transforming growth factor-beta1, interleukin-8, monocyte chemotactic protein-1, tumor nec...Continue Reading

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Citations

Dec 15, 2004·Canadian Journal of Dietetic Practice and Research : a Publication of Dietitians of Canada = Revue Canadienne De La Pratique Et De La Recherche En Diététique : Une Publication Des Diététistes Du Canada·Noreen D Willows, Katherine Gray-Donald
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