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The role of NSAIDs in colon cancer prevention

Nikolaos Antonakopoulos1, D G Karamanolis

  • 1Department of Gastroenterology, Tzaneio Hospital, Piraeus, Greece. nikolaos.antonakopoulos@novartis.com

Hepato-Gastroenterology
|November 21, 2007
PubMed

Insights

Nonsteroidal anti-inflammatory drugs (NSAIDs) show promise in preventing colorectal cancer by inhibiting COX-2, a key enzyme in tumor growth. NSAIDs reduce prostaglandin E2 and induce apoptosis, offering a protective effect against cancer development.

Area of Science:

  • Oncology
  • Pharmacology

Background:

  • Nonsteroidal anti-inflammatory drugs (NSAIDs) demonstrate efficacy in colorectal cancer prevention through animal and population studies.
  • Cyclooxygenase-2 (COX-2) is overexpressed in neoplastic colorectal tissues and plays a role in tumor angiogenesis and other oncogenic pathways.
  • Non-selective COX inhibition also shows a protective effect, indicating multiple mechanisms involved in neoplastic transformation.

Purpose of the Study:

  • To elucidate the mechanisms by which NSAIDs exert their chemopreventive effects against colorectal cancer.
  • To investigate the role of COX-2, prostaglandin E2, and PPARdelta in colorectal tumorigenesis and NSAID action.

Main Methods:

  • Review of existing animal and population-based studies on NSAID efficacy in colorectal cancer prevention.
  • Analysis of the molecular pathways involving COX-2, prostaglandin E2, and PPARdelta in neoplastic epithelium.
  • Examination of NSAID-induced effects, including prostaglandin E2 down-regulation and apoptosis induction.

Main Results:

  • NSAIDs are effective in preventing colorectal cancer, with COX-2 overexpression observed in neoplastic tissues.
  • Inhibition of COX-2 by NSAIDs down-regulates prostaglandin E2 (PGE2), which appears to negatively impact cancer occurrence.
  • NSAID-mediated induction of apoptosis is another key mechanism contributing to their protective effect.

Conclusions:

  • NSAIDs offer a protective effect against colorectal cancer through multiple mechanisms, including COX-2 inhibition and apoptosis induction.
  • Down-regulation of PGE2 by NSAIDs is a significant factor in reducing cancer occurrence.
  • The newly identified PPARdelta factor, overexpressed in neoplastic tissue, may mediate COX-2's oncogenic effects.

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