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COX-2 and colon cancer

M M Taketo1

  • 1Laboratory of Biomedical Genetics, Graduate School of Pharmaceutical Sciences, University of Tokyo, Japan. taketo@mol.f.u-tokyo.ac.jp

Inflammation Research : Official Journal of the European Histamine Research Society ... [Et Al.]
|November 27, 1998
PubMed
Summary

Cyclooxygenase-2 (COX-2) significantly drives colorectal tumor growth in mice. Inhibiting COX-2 or knocking out its gene dramatically reduced intestinal polyps, suggesting therapeutic potential.

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Area of Science:

  • Oncology
  • Genetics
  • Pharmacology

Background:

  • Familial adenomatous polyposis (FAP) is a hereditary condition characterized by numerous intestinal polyps.
  • Cyclooxygenase-2 (COX-2) is an enzyme implicated in inflammation and cancer development.
  • Understanding COX-2's role in colorectal tumorigenesis is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the role of COX-2 in colorectal tumorigenesis using a mouse model.
  • To evaluate the effects of COX-2 gene knockout on polyp development.
  • To assess the efficacy of a COX-2-selective inhibitor in preventing polyp formation.

Main Methods:

  • Utilized heterozygous Apcdelta716 knockout mice, a model for human FAP.
  • Crossed Apcdelta716 mice with COX-2 gene knockout mice.
  • Administered a COX-2-selective inhibitor to Apcdelta716 mice via chow.
  • Used Apcdelta716 littermates as positive controls.

Main Results:

  • Apcdelta716 mice developed a high number of intestinal polyps (652+/-198 SD at 10 weeks).
  • Both COX-2 gene mutation and COX-2 inhibitor treatment significantly reduced polyp number and size.
  • Demonstrated a dramatic reduction in intestinal polyps in treated/mutated mice.

Conclusions:

  • Provided direct genetic evidence for COX-2's critical role in colorectal tumorigenesis.
  • Indicated that COX-2-selective inhibitors represent a promising therapeutic strategy for colorectal polyposis.
  • Supported the potential of COX-2 inhibitors as agents for colorectal cancer prevention and treatment.

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