Quantitative structure-activity relationship of flavonoids for inhibition of heterocyclic amine mutagenicity

F. T. Hatch, Felice C Lightstone, M. E. Colvin

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

The mutagenic/carcinogenic heterocyclic amines formed during the cooking of protein foods have been determined to be a potential risk to human health. Therefore, mitigation measures are beginning to be studied. A recent finding is that the induction of mutation in Salmonella by these amines can be inhibited by the addition of flavonoids to the assay. This study combines data on the inhibitory process with structural, ab initio quantum chemical, hydropathic, and antioxidant factors to develop a quantitative structure- activity relationship (QSAR) database and statistical analysis. For 39 diverse flavonoids the inhibitory potency varied approximately 100-fold. Three predictive variables, in order of decreasing contribution to variance, are: (1) a large dipole moment; (2) after geometric minimization of energy, a small departure from planarity (i.e., small dihedral angle between the benzopyran nucleus and the attached phenyl ring), and a low rotational energy barrier to achieving planarity; and (3) fewer hydroxyl groups on the phenyl ring. However, these variables account for less than half of the variance in inhibitory potency of the flavonoids. Frontier orbital energies and antioxidant or radical scavenging properties showed little or no relationship to potency. We conclude that interference by the flavonoids with cytochrome P450 activation of the promutagens is the probable mechanism for inhibition of mutagenesis, and suggest avenues for further research.

Original languageEnglish (US)
Pages (from-to)279-299
Number of pages21
JournalEnvironmental and Molecular Mutagenesis
Volume35
Issue number4
DOIs
StatePublished - 2000
Externally publishedYes

Keywords

  • Ames/Salmonella assay
  • Antimutagens
  • Cooking mutagens
  • Cytochrome P450
  • Inhibitory mechanisms
  • Molecular planarity

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Genetics
  • Genetics(clinical)
  • Toxicology
  • Health, Toxicology and Mutagenesis

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