Interventions with antioxidants and nutrients in relation to oxidative DNA damage and repair

Mutation Research
Peter Møller, Steffen Loft

Abstract

Cells are constantly exposed to oxidants from metabolic and other biochemical reactions as well as external factors, suggesting that DNA repair systems and nutritional antioxidants are important determinants for low levels of DNA damage and cancer risk. The effects of single antioxidants, as well as various vegetables, fruits and carotenoid- and polyphenolic-rich products, have been assessed with biomarkers, mainly including DNA damage in white blood cells (WBC), urinary excretion of oxidized bases and nucleosides and DNA repair capacity. The basal levels of oxidative DNA damage, and effects of the interventions have been rather variable, possibly reflecting differences in the populations, regimens, and the type of assays. In general, single dose antioxidant interventions have shown protective effects with respect to WBC DNA oxidation. Studies with continuous ingestion of antioxidants show mixed results with respect to effects on oxidative DNA damage in WBC, possibly due to various problems with design, statistical power and period effects. Studies with only male subjects appear to show consistent antioxidant effects in terms of reduced levels of oxidized pyrimidines. Investigations of oxidatively stressed subjects, e.g. HIV-in...Continue Reading

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