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Infect. Immun., Jun 1996, 2106-2113, Vol 64, No. 6
R Schulte, P Wattiau, EL Hartland, RM Robins-Browne and GR Cornelis
Epithelial cells of the intestinal mucosa are among the first cells
encountered by invasive pathogens. Bacterial invasion of the mucosa gives
rise to an inflammatory response, characterized by the influx of
polymorphonuclear leukocytes. The chemotactic stimulus responsible for this
accumulation is unknown, but several in vitro studies have demonstrated
that epithelial cells secrete the chemokine interleukin-8 (IL-8), a potent
chemoattractant of polymorphonuclear leukocytes, upon bacterial entry. In
this study we analyzed the secretion of IL-8 by human intestinal (T84) and
cervical (HeLa) epithelial cell lines in response to infection with the
enteric pathogen Yersinia enterocolitica. IL-8 was secreted by T84 and HeLa
cells in response to invasion by Y. enterocolitica. Virulent Y.
enterocolitica induced a significantly lower level of IL-8 secretion than
nonvirulent Y. enterocolitica. Subsequent analysis employing a mutant
defective in Yop secretion and various yop mutants showed that the reduced
secretion of IL-8 is due to the presence of Yop proteins. Our data suggest
that YopB and YopD are required for the suppressive effect.
Copyright © 1996, American Society for Microbiology
Differential secretion of interleukin-8 by human epithelial cell lines upon entry of virulent or nonvirulent Yersinia enterocolitica
Microbial Pathogenesis Unit, International Institute of Cellular and Molecular Pathology, Brussels, Belgium.
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