Microbial pattern recognition receptors mediate M-cell uptake of a gram negative bacterium

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Tyrer, P
Foxwell, AR
Cripps, AW
Apicella, MA
Kyd, JM
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Alison D. O'Brien
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2006
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Abstract

The receptors involved in the sampling of particulate microbial antigens by the gut are largely unknown. Here we demonstrate for the first time in an in vitro M-cell model and in situ in isolated murine intestinal segments that the receptors TLR-4, PAF-R, and {alpha}5߱ integrin are all involved in mediating bacterial uptake associated with transcytosis. The pattern of expression of TLR-4 and {alpha}5߱ integrin differed between M cells and enterocytes. There was increased apical expression of TLR-4 in M-cell cultures, and it was present on the apical surface of murine M cells but not enterocytes in situ. In contrast, PAF-R was expressed equally by both cell types in vitro and was abundantly expressed throughout the intestinal epithelium. Inhibition of TLR-4 and PAF-R, but not TLR-2, reduced gram-negative bacterial uptake by both cell types, whereas inhibition of the apically expressed {alpha}5߱ integrin significantly reduced the ability of M cells to translocate bacteria. Hence, the involvement of each receptor was dependent not only on differences in the level of receptor expression but the cellular localization. Using bacteria that had mutations that affected the bacterial lipooligosaccharide structure indicated that the oligosaccharide moiety was important in bacterial uptake. Taken together, the data suggest that pathogen-associated molecular pattern interactions with pattern recognition receptors are key factors in M-cell recognition of intestinal antigens for mucosal immune priming.

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Infection and Immunity
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© 2006 American Society for Microbiology.This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
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Biological sciences
Agricultural, veterinary and food sciences
Biomedical and clinical sciences
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