1887

Abstract

Enterohaemorrhagic O157 : H7 is a major foodborne and environmental pathogen responsible for both sporadic cases and outbreaks of food poisoning, which can lead to serious sequelae, such as haemolytic uraemic syndrome. The structural subunit of O157 : H7 flagella is flagellin, which is both the antigenic determinant of the H7 serotype, an important factor in colonization, and an immunomodulatory protein that has been determined to be a major pro-inflammatory component through the instigation of host cell signalling pathways. Flagellin has highly conserved N- and C-terminal regions that are recognized by the host cell pattern recognition receptor Toll-like receptor (TLR) 5. Activation of this receptor triggers cell signalling cascades, which are known to activate host cell kinases and transcription factors that respond with the production of inflammatory mediators such as the chemokine interleukin-8 (IL-8), although the exact components of this pathway are not yet fully characterized. We demonstrate that O157 : H7-derived flagellin induces rapid phosphorylation of the epidermal growth factor receptor (EGFR), as an early event in intestinal epithelial cell signalling, and that this is required for the release of the pro-inflammatory cytokine IL-8.

Funding
This study was supported by the:
  • Biotechnology and Biological Sciences Research Council
  • BBSRC (Award BB/C508485/1)
  • Rural and Environment Research and Analysis Directorate
  • RERAD
  • RERAD (Award 22050)
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2011-08-01
2024-04-16
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