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Infect Immun, March 1998, p. 1216-1224, Vol. 66, No. 3
Max von Pettenkofer-Institut für
Hygiene und Medizinische
Mikrobiologie, Ludwig-Maximilians-Universität München,
D-80336 Munich, Germany
Received 25 August 1997/Returned for modification 3 October
1997/Accepted 3 December 1997
In response to bacterial entry epithelial cells up-regulate
expression and secretion of various proinflammatory cytokines, including interleukin-8 (IL-8). We studied Yersinia
enterocolitica O:8-induced IL-8 secretion by intestinal
epithelial cells as a function of cell differentiation. For this
purpose, human T84 intestinal epithelial cells were grown on permeable
supports, which led to the formation of tight monolayers of polarized
intestinal epithelial cells. To analyze IL-8 secretion as a function of
cell differentiation, T84 monolayers were infected from the apical or
basolateral side at different stages of differentiation. Both virulent
(plasmid-carrying) and nonvirulent (plasmid-cured) Y. enterocolitica strains invaded nondifferentiated T84 cells from the apical side. Yersinia invasion into T84 cells was
followed by secretion of IL-8. After polarized differentiation of T84
cells Y. enterocolitica was no longer able to invade
from the apical side or to induce IL-8 secretion by T84 cells. However,
Y. enterocolitica invaded and induced IL-8 secretion
by polarized T84 cells after infection from the basolateral side.
Basolateral invasion required the presence of the Yersinia
invasion locus, inv, suggesting
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Yersinia enterocolitica-Induced Interleukin-8
Secretion by Human Intestinal Epithelial Cells Depends on Cell
Differentiation
1 integrin-mediated cell invasion. After basolateral infection, Yersinia-induced IL-8 secretion was not strictly dependent
on cell invasion. Thus, although the plasmid-carrying Y. enterocolitica strain did not significantly invade T84 cells, it
induced significant IL-8 secretion. Taken together, these data show
that Yersinia-triggered IL-8 secretion by intestinal
epithelial cells depends on cell differentiation and might be induced
by invasion as well as by basolateral adhesion, suggesting that
invasion is not essential for triggering IL-8 production. Whether IL-8
secretion is involved in the pathogenesis of
Yersinia-induced abscess formation in Peyer's patch tissue
remains to be shown.
*
Corresponding author. Mailing address: Max von
Pettenkofer-Institut für Hygiene und Medizinische Mikrobiologie,
Ludwig-Maximilians-Universität München, Pettenkoferstrasse
9a, D-80336 Munich, Germany. Phone: 49-89-51 60 52 59. Fax: 49-89-53 80 584. E-mail:
schulte{at}m3401.mpk.med.uni-muenchen.de.
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