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Green tea polyphenol (-)-epigallocatechin-3-gallate inhibits cyclooxygenase-2 expression in colon carcinogenesis

Guang Peng1, Dan A Dixon, Stephanie J Muga

  • 1Department of Pathology and Microbiology, School of Medicine, The University of South Carolina, and South Carolina Cancer Center, Columbia, South Carolina 29203, USA.

Molecular Carcinogenesis
|March 2, 2006
PubMed

Insights

Green tea

Area of Science:

  • Oncology
  • Molecular Biology
  • Nutritional Science

Background:

  • Green tea consumption is linked to anti-cancer effects, particularly in colon cancer.
  • Cyclooxygenase-2 (COX-2) overexpression is implicated in colon cancer development.
  • Non-steroidal anti-inflammatory drugs (NSAIDs) show chemopreventive potential by inhibiting COX-2.

Purpose of the Study:

  • To investigate if green tea's anti-cancer properties involve the modulation of COX-2 expression.
  • To determine the specific mechanisms by which green tea polyphenols affect COX-2 in colon cancer cells.

Main Methods:

  • Human colorectal cancer cell lines (HT-29 and HCA-7) were treated with (-)-epigallocatechin-3-gallate (EGCG).
  • Analysis of COX-2 mRNA and protein levels, signaling pathways (ERK1/2, Akt), and NF-kappaB activation.
  • Investigation of COX-2 promoter activity and mRNA decay via the 3'UTR.

Main Results:

  • EGCG significantly inhibited both COX-2 mRNA and protein overexpression in colon cancer cells.
  • EGCG downregulated the ERK1/2 and Akt signaling pathways.
  • EGCG reduced COX-2 promoter activity by inhibiting NF-kappaB activation and promoted mRNA decay.

Conclusions:

  • Inhibition of COX-2 is a key mechanism underlying green tea's anti-proliferative effects in colon cancer.
  • Dietary factors like green tea polyphenols play a significant role as anti-cancer agents.
  • EGCG's multifaceted action on COX-2 regulation highlights its therapeutic potential.

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