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Kaempferol-induced nuclear DNA damage and lipid peroxidation
1Division of Toxicological Research, Food and Drug Administration, Laurel, MD 20708.
Cancer Letters
|October 14, 1994
Summary
Kaempferol, a flavonoid, caused DNA damage and lipid peroxidation in rat liver nuclei, especially with iron or copper. This suggests potential pro-oxidant effects, challenging its antioxidant reputation.
Area of Science:
- Biochemistry
- Molecular Biology
- Toxicology
Background:
- Polyphenolic flavonoids, like kaempferol, are often recognized for antioxidant and anticarcinogenic properties.
- However, their potential pro-oxidant activities and mechanisms of cellular damage require further investigation.
Purpose of the Study:
- To investigate the DNA damaging and lipid peroxidation effects of kaempferol in isolated rat-liver nuclei.
- To determine the influence of transition metals (iron and copper) and radical scavengers on these effects.
Main Methods:
- Isolated rat-liver nuclei were treated with varying concentrations of kaempferol under aerobic conditions.
- The effects of iron(III), copper(II), catalase, superoxide dismutase (SOD), mannitol, and sodium azide on DNA damage and lipid peroxidation were assessed.
Main Results:
- Kaempferol induced significant, concentration-dependent nuclear DNA degradation and lipid peroxidation.
- These effects were potentiated by iron(III) or copper(II).
- Radical scavengers showed complex interactions, sometimes inhibiting and sometimes stimulating kaempferol-induced damage, particularly in the presence of transition metals.
Conclusions:
- Kaempferol exhibits pro-oxidant properties, capable of inducing DNA damage and lipid peroxidation.
- The pro-oxidant activity is modulated by transition metals and radical scavengers.
- These findings suggest a potential dual role for flavonoids in mutagenesis and carcinogenesis, contrary to their commonly accepted antioxidant roles.