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Erschienen in: Journal of Cancer Research and Clinical Oncology 6/2010

01.06.2010 | Original Paper

Nucleolin as cell surface receptor for tumor necrosis factor-α inducing protein: a carcinogenic factor of Helicobacter pylori

verfasst von: Tatsuro Watanabe, Hideaki Tsuge, Takahito Imagawa, Daisuke Kise, Kazuya Hirano, Masatoshi Beppu, Atsushi Takahashi, Kensei Yamaguchi, Hirota Fujiki, Masami Suganuma

Erschienen in: Journal of Cancer Research and Clinical Oncology | Ausgabe 6/2010

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Abstract

Purpose

Tumor necrosis factor-α inducing protein (Tipα) is a unique carcinogenic factor released from Helicobacter pylori (H. pylori). Tipα specifically binds to cells and is incorporated into cytosol and nucleus, where it strongly induces expression of TNF-α and chemokine genes mediated through NF-κB activation, resulting in tumor development. To elucidate mechanism of action of Tipα, we studied a binding protein of Tipα in gastric epithelial cells.

Methods

Tipα binding protein was found in cell lysates of mouse gastric cancer cell line MGT-40 by FLAG-pull down assay and identified to be cell surface nucleolin by flow cytometry using anti-nucleolin antibody. Incorporation of Tipα into the cells was determined by Western blotting and expression of TNF-α gene was quantified by RT-PCR.

Results

Nucleolin was co-precipitated with Tipα-FLAG, but not with del-Tipα-FLAG (an inactive mutant). After treatment with Tipα-FLAG, incorporated Tipα was co-immunoprecipitated with endogenous nucleolin using anti-nucleolin antibody. The direct binding of Tipα to recombinant His-tagged nucleolin fragment (284–710) was also confirmed. Although nucleolin is an abundant non-ribosomal protein of the nucleolus, we found that nucleolin is present on the cell surface of MGT-40 cells. Pretreatment with anti-nucleolin antibody enhanced Tipα-incorporation into the cells through nucleolin internalization. In addition, pretreatment with tunicamycin, an inhibitor of N-glycosylation, decreased the amounts of cell surface nucleolin and inhibited both internalization of Tipα and expression of TNF-α gene.

Conclusions

All the results indicate that nucleolin acts as a receptor for Tipα and shuttles Tipα from cell surface to cytosol and nuclei. These findings provide a new mechanistic insight into gastric cancer development with Tipα.
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Metadaten
Titel
Nucleolin as cell surface receptor for tumor necrosis factor-α inducing protein: a carcinogenic factor of Helicobacter pylori
verfasst von
Tatsuro Watanabe
Hideaki Tsuge
Takahito Imagawa
Daisuke Kise
Kazuya Hirano
Masatoshi Beppu
Atsushi Takahashi
Kensei Yamaguchi
Hirota Fujiki
Masami Suganuma
Publikationsdatum
01.06.2010
Verlag
Springer-Verlag
Erschienen in
Journal of Cancer Research and Clinical Oncology / Ausgabe 6/2010
Print ISSN: 0171-5216
Elektronische ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-009-0733-y

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