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*
Gastroenterology Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215;
Division of Gastroenterology, Vanderbilt University Medical Center, Nashville, TN 37232; and
School of Health Sciences, University of Wolverhampton, Wolverhampton, United Kingdom
The aim of this study was to determine whether Helicobacter
pylori activates mitogen-activated protein (MAP) kinases in
gastric epithelial cells. Infection of AGS cells with an H.
pylori cag+ strain rapidly (5 min) induced a
dose-dependent activation of extracellular signal-regulated kinases
(ERK), p38, and c-Jun N-terminal kinase (JNK) MAP kinases, as
determined by Western blot analysis and in vitro kinase assay. Compared
with cag+ strains,
cag- clinical isolates were less potent in
inducing MAP kinase, particularly JNK and p38, activation. Isogenic
inactivation of the picB region of the
cag pathogenicity island resulted in a similar loss of
JNK and p38 MAP kinase activation. The specific MAP kinase inhibitors,
PD98059 (25 µM; MAP kinase kinase (MEK-1) inhibitor) and SB203580 (10
µM; p38 inhibitor), reduced H. pylori-induced IL-8
production in AGS cells by 78 and 82%, respectively
(p < 0.01 for each). Both inhibitors together
completely blocked IL-8 production (p < 0.001).
However, the MAP kinase inhibitors did not prevent H.
pylori-induced I
B
degradation or NF-
B activation.
Thus, H. pylori rapidly activates ERK, p38, and JNK MAP
kinases in gastric epithelial cells; cag+
isolates are more potent than cag- strains
in inducing MAP kinase phosphorylation and gene products of the
cag pathogenicity island are required for maximal MAP
kinase activation. p38 and MEK-1 activity are required for H.
pylori-induced IL-8 production, but do not appear to be
essential for H. pylori-induced NF-
B activation.
Since MAP kinases regulate cell proliferation, differentiation,
programmed death, stress, and inflammatory responses, activation of
gastric epithelial cell MAP kinases by H. pylori
cag+ strains may be instrumental in inducing
gastroduodenal inflammation, ulceration, and
neoplasia.
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