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J. Biol. Chem., Vol. 275, Issue 21, 16064-16072, May 26, 2000
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From the Helicobacter pylori is an etiological
agent in the development of mucosa-associated lymphoid tissue lymphoma
and gastric adenocarcinoma. Patients infected with H. pylori carry a 3-6-fold increased risk of developing cancer
compared with uninfected individuals. H. pylori strains
expressing the cytotoxin-associated antigen A (CagA) are more
frequently associated with the development of neoplasia than
cagA-negative strains. However, the molecular mechanism by which
H. pylori causes neoplastic transformation remains unclear. Here we report that exposure of gastric epithelial cells to H. pylori induces activation of the transcription factor activator protein 1. Activation of the proto-oncogenes c-fos and
c-jun is strongly induced. We show that H. pylori activates the ERK/MAP kinase cascade, resulting in Elk-1
phosphorylation and increased c-fos transcription. H. pylori strains that do not express CagA or that are mutated in
cag genes encoded by the CagI pathogenicity island do not
induce activator protein 1, MAP kinase activity, or c-fos
or c-jun activation. Proto-oncogene activation may
represent a crucial step in the pathomechanism of H. pylori
induced neoplasia.
Helicobacter pylori Activates Mitogen-activated
Protein Kinase Cascades and Induces Expression of the
Proto-oncogenes c-fos and c-jun*
,
Division of Experimental Anaesthesiology,
University Hospital Freiburg, Center for Tumor Biology, P. O. Box
1120, 79106 Freiburg, Germany, the § IRIS-BIOCINE, Via
Fiorentina 1, 53100 Siena, Italy, and the ¶ Institut für
Medizinische Mikrobiologie und Hygiene der Universität Freiburg,
Hermann-Herder-Strasse 11, 79104 Freiburg, Germany
*
This work was supported by Grant Pa 611/4-1 from the
Deutsche Forschungsgemeinschaft and by the Alfried
Krupp-Förderpreis (to H. L. P.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.:
49-761-206-1530; Fax.: 49-761-206-1529; E-mail:
pahl@uni-freiburg.de.
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