Dendritic cells express tight junction proteins and penetrate gut epithelial monolayers to sample bacteria
- PMID: 11276208
- DOI: 10.1038/86373
Dendritic cells express tight junction proteins and penetrate gut epithelial monolayers to sample bacteria
Abstract
Penetration of the gut mucosa by pathogens expressing invasion genes is believed to occur mainly through specialized epithelial cells, called M cells, that are located in Peyer's patches. However, Salmonella typhimurium that are deficient in invasion genes encoded by Salmonella pathogenicity island 1 (SPI1) are still able to reach the spleen after oral administration. This suggests the existence of an alternative route for bacterial invasion, one that is independent of M cells. We report here a new mechanism for bacterial uptake in the mucosa tissues that is mediated by dendritic cells (DCs). DCs open the tight junctions between epithelial cells, send dendrites outside the epithelium and directly sample bacteria. In addition, because DCs express tight-junction proteins such as occludin, claudin 1 and zonula occludens 1, the integrity of the epithelial barrier is preserved.
Comment in
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Periscope, up! Monitoring microbes in the intestine.Nat Immunol. 2001 Apr;2(4):288-90. doi: 10.1038/86292. Nat Immunol. 2001. PMID: 11276197 No abstract available.
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