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Infect. Immun., May 1995, 1732-1738, Vol 63, No. 5
J Huang, PW O'Toole, P Doig and TJ Trust
Following exposure to Helicobacter pylori cells, epithelial cell lines
secreted interleukin-6 (IL-6) and IL-8 but not tumor necrosis factor alpha.
Purified IL-6 alone did not stimulate IL-8 production from the cell lines
tested, indicating that IL-6 was not an intermediary in IL-8 induction.
Enhanced IL-8 secretion occurred in a time- and dose- dependent manner.
None of 12 antibiotics tested exhibited a significant effect on
IL-8-inducing activity, suggesting that preformed antigens were responsible
for stimulating IL-8 secretion in vitro. Live bacterial cells caused the
highest level of stimulation. Proteinase- digested and heated (56 or 100
degrees C) cells had significantly reduced stimulatory activities. Purified
H. pylori lipopolysaccharide, but not exopolysaccharide, stimulated
low-level secretion of IL-8, but only at high concentrations, while a
water-extracted H. pylori antigen preparation was strongly stimulatory for
HEp-2 cells. No reduction in IL-8-stimulatory activity was observed for H.
pylori mutants negative for urease activity, production of a major
lipoprotein, and motility. The noncytotoxic strain CCUG 915 stimulated
lower IL-8 levels than other isolates. However, the otherwise isogenic
cytotoxin-negative mutant 17874 delta vacA (S. H. Phadnis, D. Ilver, L.
Janzon, S. Normark, and T. U. Westblom, Infect. Immun. 62:1557-1565, 1994)
had the same IL-8-stimulatory ability as the parent strain, suggesting that
surface proteins other than the vacuolating cytotoxin are involved in IL-8
stimulation.
Copyright © 1995, American Society for Microbiology
Stimulation of interleukin-8 production in epithelial cell lines by Helicobacter pylori
Canadian Bacterial Diseases Network, University of Victoria, British Columbia.
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