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Evidence that dietary supplementation with carotenoids and carotenoid-rich foods modulates the DNA damage:repair balance in human lymphocytes

Published online by Cambridge University Press:  09 March 2007

Siân B. Astley ,
Ruan M. Elliott ,
David B. Archer  and
Susan Southon
Siân B. Astley*
Affiliation:
Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK
Ruan M. Elliott
Affiliation:
Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK
David B. Archer
Affiliation:
School of Life and Environmental Sciences, University Park, University of Nottingham, Nottingham NG7 2RD, UK
Susan Southon
Affiliation:
Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK
*
*Corresponding author: Dr Siân Astley, fax +44 1603 255 167, email sian.astley@bbsrc.ac.uk
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Abstract

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Epidemiological evidence has shown that the habitual consumption of diets high in fruits and vegetables is associated with reduced risk of cancers. The challenge is to identify causal mechanisms of effect. The aim of the current study was to determine whether an increase in rate of removal of DNA single-strand breaks (SSB) following oxidative challenge could be provoked ex vivo in peripheral blood lymphocytes (PBL). The PBL were isolated from apparently healthy volunteers following dietary intervention with: (1) a mixed carotene capsule; (2) a daily portion of cooked minced carrots; (3) a matched placebo; (4) a portion of mandarin oranges; (5) vitamin C tablets. Single-cell gel electrophoresis was employed to measure baseline levels of SSB and DNA susceptibility to oxidative damage, and to monitor the number of SSB over 4 h, in both unchallenged and H2O2-treated PBL. The enzymatic capacity for repair of different types of DNA oxidative lesions was also measured using two related cell-free assays. There was no evidence that any of the dietary supplementation regimens altered baseline levels of SSB, provided any direct antioxidant protection or altered DNA repair capacity, with two exceptions: the number of SSB following exposure to H2O2 decreased more rapidly in PBL from volunteers given the mixed carotene capsules and repair patch synthesis activity in PBL increased from volunteers given the cooked carrots. These results suggest that carotenoids and carotenoid-rich foods can influence DNA damage:repair by modulation of discrete stages in the DNA repair mechanisms.

Keywords

Carotenoidsβ-Caroteneβ-CryptoxanthinDNA damageDNA repairSingle-cell gel electrophoresis
Type
Research Article
Information
British Journal of Nutrition , Volume 91 , Issue 1 , January 2004 , pp. 63 - 72
Copyright
Copyright © The Nutrition Society 2004

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