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Helicobacter pylori membrane protein 1: a new carcinogenic factor of Helicobacter pylori

M Suganuma1, M Kurusu, S Okabe

  • 1Saitama Cancer Center, Saitama 362-0806, Japan.

Cancer Research
|August 28, 2001
PubMed

Insights

Helicobacter pylori membrane protein 1 (HP-MP1) shows strong carcinogenic activity. HP-MP1 cooperates with viral Ras protein, promoting stomach cancer development.

Area of Science:

  • Microbiology
  • Oncology
  • Molecular Biology

Background:

  • Helicobacter pylori infection is linked to human stomach cancer.
  • A novel H. pylori gene, membrane protein 1 (HP-MP1), induces inflammatory cytokines.
  • Tumor necrosis factor-alpha (TNF-α) is implicated in cancer initiation and promotion.

Purpose of the Study:

  • To investigate the role of HP-MP1 in H. pylori-associated carcinogenesis.
  • To determine the carcinogenic potential of HP-MP1 and urease B genes in specific cell lines.

Main Methods:

  • Transfection of BALB/3T3 (control) and Bhas 42 (initiated) cells with HP-MP1, urease B, or vector DNA.
  • Assessment of TNF-α gene expression.
  • Tumorigenicity testing in nude mice.

Main Results:

  • Bhas 42 cells transfected with HP-MP1 (Bhas/mpl clones) exhibited strong TNF-α expression and 100% tumor formation in nude mice.
  • Bhas 42 cells transfected with urease B (Bhas/ure clones) showed weak tumorigenicity.
  • Control BALB/3T3 cells and vector-transfected cells did not form tumors.

Conclusions:

  • HP-MP1 demonstrates significant carcinogenic activity, particularly in cooperation with viral Ras protein.
  • Urease B exhibits weak carcinogenic activity.
  • HP-MP1 is a key factor in H. pylori-induced stomach carcinogenesis.

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