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Improving metabolic stability of cancer chemoprotective polyphenols

Thomas Walle1, Xia Wen, U Kristina Walle

  • 1Medical University of South Carolina, Department of Cell and Molecular Pharmacology and Experimental Therapeutics, 173 Ashley Avenue, Charleston, SC 29425, USA. wallet@musc.edu

Expert Opinion on Drug Metabolism & Toxicology
|June 2, 2007
PubMed

Insights

Dietary polyphenols show promise for cancer prevention but suffer from poor bioavailability. Permethylation enhances their absorption and stability, suggesting a future for these modified compounds as chemoprotective agents.

Area of Science:

  • Nutritional biochemistry
  • Pharmacology
  • Cancer chemoprevention

Background:

  • Dietary flavonoids and polyphenols offer potential therapeutic benefits for cancer and other diseases.
  • Poor oral bioavailability, primarily due to glucuronidation and sulfation, significantly limits their efficacy.
  • Developing strategies to enhance polyphenol bioavailability is crucial for their therapeutic application.

Purpose of the Study:

  • To assess the metabolic stability of polyphenols using a human hepatic S9 fraction model.
  • To investigate the impact of permethylation on polyphenol bioavailability and biological activity.
  • To evaluate the potential of permethylated polyphenols as chemoprotective agents.

Main Methods:

  • Utilized a commercially available human hepatic S9 fraction to assess metabolic stability.
  • Employed permethylation to block metabolic conjugation pathways of polyphenols.
  • Evaluated changes in metabolic stability and intestinal absorption post-permethylation.

Main Results:

  • The human hepatic S9 fraction provided an effective and accurate method for assessing metabolic stability.
  • Permethylation significantly increased the metabolic stability and intestinal absorption of polyphenols.
  • Biological activities were maintained or enhanced after permethylation.

Conclusions:

  • Permethylated polyphenols demonstrate improved bioavailability and metabolic stability.
  • This modification strategy holds promise for overcoming the limitations of natural polyphenols.
  • Permethylated polyphenols represent a potential future for chemoprotective agents in disease prevention and treatment.

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