Journal of Cancer Research and Clinical Oncology

, Volume 133, Issue 5, pp 287–296

Helicobacter pylori-secreting protein Tipα is a potent inducer of chemokine gene expressions in stomach cancer cells

  • Takashi Kuzuhara
  • Masami Suganuma
  • Miki Kurusu
  • Hirota Fujiki
Original Paper

DOI: 10.1007/s00432-006-0169-6

Cite this article as:
Kuzuhara, T., Suganuma, M., Kurusu, M. et al. J Cancer Res Clin Oncol (2007) 133: 287. doi:10.1007/s00432-006-0169-6
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Abstract

Purpose

Stomach cancer has a high mortality rate in East Asia, and is strongly associated with Helicobacter pylori (H. pylori) infection. H.pylori is known to express chemokine genes in the gastric mucosa, chemokines that are important host immune factors facilitating inflammation and tumor growth. To investigate the mechanism of carcinogenesis in the stomach, it is essential to determine which molecule of H. pylori is involved in induction of chemokines, but this has remained unclear. We previously reported that a tumor necrosis factor-α (TNF-α) inducing protein (Tipα) secreted from H. pylori acts as a tumor promoter in stomach cancer development, and thus started to investigate whether Tipα is involved in induction of chemokine genes.

Methods

Comprehensive gene expression analysis was conducted using DNA microarray and KeyMolnet analyses. The gene expression was quantitatively analyzed by real-time RT-PCR.

Results

Comprehensive and quantitative gene expression analyses revealed that Tipα induces gene expression of the chemokines Ccl2, Ccl7, Ccl20, Cxcl1, Cxcl2, Cxcl5 and Cxcl10 extensively and simultaneously in mouse stomach cancer cells, MGT-40. Tipα induced high levels of chemokine gene expression, whereas inactive deleted Tipα, del-Tipα, showed only marginal expression, suggesting a correlation between tumor promotion and chemokine gene expression by Tipα. MG-132, a proteasome inhibitor which represses NF-κB-activation, inhibited chemokine gene expressions.

Conclusion

We report here that Tipα of H. pylori gene product is a strong inducer of chemokine gene expressions, providing a new model for stomach cancer development.

Keywords

TipαHelicobacter pyloriChemokineStomach cancerGastric epithelial cell

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Takashi Kuzuhara
    • 1
  • Masami Suganuma
    • 2
  • Miki Kurusu
    • 2
  • Hirota Fujiki
    • 1
  1. 1.Laboratory of Biochemistry, Faculty of Pharmaceutical SciencesTokushima Bunri UniversityTokushimaJapan
  2. 2.Saitama Cancer CenterResearch Institute for Clinical OncologySaitamaJapan