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Infection and Immunity, April 2002, p. 2057-2064, Vol. 70, No. 4
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.4.2057-2064.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Lipoteichoic Acids from Lactobacillus johnsonii Strain La1 and Lactobacillus acidophilus Strain La10 Antagonize the Responsiveness of Human Intestinal Epithelial HT29 Cells to Lipopolysaccharide and Gram-Negative Bacteria

Karine Vidal,1* Anne Donnet-Hughes,1 and Dominique Granato2

Food Immunology Group,1 Digestive Health Group, Nestlé Research Center, Nestec Limited, Vers-chez-les-Blanc, Lausanne, Switzerland2

Received 2 October 2001/ Returned for modification 1 November 2001/ Accepted 21 December 2001

Intestinal epithelial cells (IECs) respond to lipopolysaccharide (LPS) from gram-negative bacteria in the presence of the soluble form of CD14 (sCD14), a major endotoxin receptor. Since sCD14 is also known to interact with gram-positive bacteria and their components, we looked at whether sCD14 could mediate their effects on human IECs. To this end, we examined the production of proinflammatory cytokines following exposure of the IECs to specific gram-positive bacteria or their lipoteichoic acids (LTAs) in the absence and presence of human milk as a source of sCD14. In contrast to LPS from Escherichia coli or Salmonella enteritidis, neither the gram-positive bacteria Lactobacillus johnsonii strain La1 and Lactobacillus acidophilus strain La10 nor their LTAs stimulated IECs, even in the presence of sCD14. However, both LTAs inhibited the sCD14-mediated LPS responsiveness of IECs. We have previously hypothesized that sCD14 in human milk is a means by which the neonate gauges the bacterial load in the intestinal lumen and liberates protective proinflammatory cytokines from IECs. The present observations suggest that gram-positive organisms, via their LTAs, temper this response and prevent an exaggerated inflammatory response.

* Corresponding author. Mailing address: Food Immunology Group, Nestec Limited, Nestlé Research Center, Vers-chez-les-Blanc, P.O. Box 44, CH-1000 Lausanne 26, Switzerland. Phone: 41 21 785 82 65. Fax: 41 21 785 89 25. E-mail: karine.vidal{at}rdls.nestle.com.

Editor: E. I. Tuomanen

Infection and Immunity, April 2002, p. 2057-2064, Vol. 70, No. 4
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.4.2057-2064.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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