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J. Biol. Chem., Vol. 277, Issue 9, 7438-7446, March 1, 2002
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From the Max-Planck-Institute of Infection Biology, Department of
Molecular Biology, Schumannstrasse 21/22, Berlin 10117, Germany
The human-specific pathogen Neisseria
gonorrhoeae expresses opacity-associated (Opa) protein adhesins
that bind to various members of the carcinoembryonic antigen-related
cellular adhesion molecule (CEACAM) family. In this study, we have
analyzed the mechanism underlying N. gonorrhoeae-induced
CEACAM up-regulation in epithelial cells. Epithelial cells represent
the first barrier for the microbial pathogen. We therefore
characterized CEACAM expression in primary human ovarian surface
epithelial (HOSE) cells and found that CEACAM1-3 (L, S) and CEACAM1-4
(L, S) splice variants mediate an increased
Opa52-dependent gonoccocal binding to HOSE
cells. Up-regulation of these CEACAM molecules in HOSE cells is a
direct process that takes place within 2 h postinfection and
depends on close contact between microbial pathogen and HOSE cells.
N. gonorrhoeae-triggered CEACAM1 up-regulation involves activation of the transcription factor nuclear factor
Nuclear Factor-
B Directs Carcinoembryonic Antigen-related
Cellular Adhesion Molecule 1 Receptor Expression in
Neisseria gonorrhoeae-infected Epithelial
Cells*
, and
B (NF-
B), which translocates as a p50/p65 heterodimer into the nucleus, and an
NF-
B-specific inhibitory peptide inhibited CEACAM1-receptor up-regulation in N. gonorrhoeae-infected HOSE cells.
Bacterial lipopolysaccharides did not induce NF-
B and CEACAM
up-regulation, which corresponds to our findings that HOSE cells do not
express toll-like receptor 4. The ability of N. gonorrhoeae
to up-regulate its epithelial receptor CEACAM1 through NF-
B suggests
an important mechanism allowing efficient bacterial colonization during
the initial infection process.
*
This work was supported in part by Deutsche
Forschungsgemeinschaft Grant Me705/5-1 and the Fonds der Chemischen
Industrie and by a European Molecular Biology Organization long term
fellowship (to O. B.).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.: 49-30-284-60- 402; Fax: 49-30-28460-401; E-mail: meyer@mpiib-berlin.mpg.de.
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