Suppression by flavonoids of cyclooxygenase-2 promoter-dependent transcriptional activity in colon cancer cells:

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Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach
10:01

Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach

Published on: June 23, 2026

M Mutoh1, M Takahashi, K Fukuda

  • 1Cancer Prevention Division, National Cancer Center Research Institute, Chuo-ku, Tokyo 104-0045, Japan.

Japanese Journal of Cancer Research : Gann
|August 2, 2000
PubMed

Insights

Quercetin effectively suppresses cyclooxygenase-2 (COX-2) gene transcription in colon cancer cells. Structural features of flavonoids, like hydroxyl groups, are key for this suppressive activity, guiding the development of new cancer therapies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Cyclooxygenase-2 (COX-2) is implicated in cancer development.
  • Understanding COX-2 gene regulation is crucial for cancer therapy.

Purpose of the Study:

  • To investigate the suppressive effects of various flavonoids on COX-2 gene transcription.
  • To identify structural features of flavonoids responsible for COX-2 inhibition.

Main Methods:

  • Reporter gene assay in human colon cancer DLD-1 cells.
  • Structure-activity relationship analysis of twelve different flavonoids.
  • Chemical modification (bromination) to assess hydroxyl group importance.

Main Results:

  • Quercetin demonstrated the highest potency in suppressing COX-2 transcription (IC50 = 10.5 microM).
  • Catechin and epicatechin exhibited weak activity (IC50 = 415.3 microM).
  • Flavonoid structure, including hydroxyl groups on the B ring, an oxo group at C4, and low electron density on the A ring's hydroxyl group, significantly impacts COX-2 suppression.

Conclusions:

  • Flavonoid structure dictates their efficacy in suppressing COX-2 transcription.
  • Specific structural modifications, like bromination, can enhance suppressive potency.
  • Findings provide a foundation for designing novel COX-2 transcriptional suppressors for cancer treatment.

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