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Cancer Epidemiology, Biomarkers & Prevention
Cancer Epidemiology, Biomarkers & Prevention
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No Effect of 600 Grams Fruit and Vegetables Per Day on Oxidative DNA Damage and Repair in Healthy Nonsmokers

Peter Møller, Ulla Vogel, Anette Pedersen, Lars O. Dragsted, Brittmarie Sandström and Steffen Loft
Peter Møller
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Ulla Vogel
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Anette Pedersen
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Lars O. Dragsted
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Brittmarie Sandström
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Steffen Loft
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DOI:  Published October 2003
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Abstract

In several epidemiological studies, high intakes of fruits and vegetables have been associated with a lower incidence of cancer. Theoretically, intake of antioxidants by consumption of fruits and vegetables should protect against reactive oxygen species and decrease the formation of oxidative DNA damage. We set up a parallel 24-day dietary placebo-controlled intervention study in which 43 subjects were randomized into three groups receiving an antioxidant-free basal diet and 600 g of fruits and vegetables, or a supplement containing the corresponding amounts of vitamins and minerals, or placebo. Blood and urine samples were collected before, once a week, and 4 weeks after the intervention period. The level of strand breaks, endonuclease III sites, formamidopyrimidine sites, and sensitivity to hydrogen peroxide was assessed in mononuclear blood cells by the comet assay. Excretion of 7-hydro-8-oxo-2′-deoxyguanine was measured in urine. The expressions of oxoguanine glycosylase 1 and excision repair cross complementing 1 DNA repair genes, determined by real-time reverse transcription-PCR of mRNAs, were investigated in leukocytes. Consumption of fruits and vegetables or vitamins and minerals had no effect on oxidative DNA damage measured in mononuclear cell DNA or urine. Hydrogen peroxide sensitivity, detected by the comet assay, did not differ between the groups. Expression of excision repair cross complementing 1 and oxoguanine glycosylase 1 in leukocytes was not related to the diet consumed. Our results show that after 24 days of complete depletion of fruits and vegetables, or daily ingestion of 600 g of fruit and vegetables, or the corresponding amount of vitamins and minerals, the level of oxidative DNA damage was unchanged. This suggests that the inherent antioxidant defense mechanisms are sufficient to protect circulating mononuclear blood cells from reactive oxygen species.

  • Received October 30, 2002.
  • Revision received June 17, 2003.
  • Accepted June 19, 2003.
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Cancer Epidemiology Biomarkers & Prevention: 12 (10)
October 2003
Volume 12, Issue 10
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No Effect of 600 Grams Fruit and Vegetables Per Day on Oxidative DNA Damage and Repair in Healthy Nonsmokers
Peter Møller, Ulla Vogel, Anette Pedersen, Lars O. Dragsted, Brittmarie Sandström and Steffen Loft
Cancer Epidemiol Biomarkers Prev October 1 2003 (12) (10) 1016-1022;

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No Effect of 600 Grams Fruit and Vegetables Per Day on Oxidative DNA Damage and Repair in Healthy Nonsmokers
Peter Møller, Ulla Vogel, Anette Pedersen, Lars O. Dragsted, Brittmarie Sandström and Steffen Loft
Cancer Epidemiol Biomarkers Prev October 1 2003 (12) (10) 1016-1022;
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