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Methyleugenol and oxidative metabolites induce DNA damage and interact with human topoisomerases

Isabel Anna Maria Groh1,2, Olga Rudakovski1, Malte Gründken3

  • 1Institute of Chemistry, Division of Food Chemistry and Toxicology, University of Kaiserslautern, Kaiserslautern, Germany.

Archives of Toxicology
|November 7, 2015
PubMed

Insights

Methyleugenol and its metabolites cause DNA damage in human colon cells. Its metabolites, methyleugenol-2

Area of Science:

  • Toxicology
  • Molecular Biology
  • Carcinogenesis

Background:

  • Methyleugenol, a compound in herbs and spices, is recognized as a genotoxic carcinogen by the EU.
  • Understanding the genotoxic mechanisms of methyleugenol and its metabolites is crucial for risk assessment.

Purpose of the Study:

  • To investigate the biological mechanisms underlying the genotoxic properties of methyleugenol and its oxidative metabolites.
  • To assess the impact of methyleugenol and its metabolites on DNA integrity and topoisomerase activity in human colon cells.

Main Methods:

  • Exposure of human colon carcinoma cells (HT29) to methyleugenol and its metabolites.
  • Assessment of DNA damage using biomarkers such as phosphorylated H2AX and micronuclei induction.
  • Evaluation of topoisomerase I activity and interaction with DNA.

Main Results:

  • Methyleugenol and its metabolites enhanced DNA damage in HT29 cells.
  • Specific metabolites, methyleugenol-2',3'-epoxide and 3'-oxomethylisoeugenol, increased phosphorylated H2AX levels and induced micronuclei.
  • These metabolites inhibited topoisomerase I activity but did not act as classical topoisomerase poisons.

Conclusions:

  • Methyleugenol metabolites contribute to genotoxicity through mechanisms involving DNA damage and topoisomerase I inhibition.
  • 3'-oxomethylisoeugenol may reduce the effectiveness of conventional topoisomerase I poisons.
Keywords:
DNA damageDNA double-strand breaksMethyleugenolMicronucleus inductionOxidative metabolitesTopoisomerase inhibition

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