Molecular and Cellular Biochemistry

, Volume 266, Issue 1–2, pp 37–56 | Cite as

Role of oxygen radicals in DNA damage and cancer incidence

  • Marian Valko
  • Mario Izakovic
  • Milan Mazur
  • Christopher J. Rhodes
  • Joshua Telser
Article

Abstract

The development of cancer in humans and animals is a multistep process. The complex series of cellular and molecular changes participating in cancer development are mediated by a diversity of endogenous and exogenous stimuli. One type of endogenous damage is that arising from intermediates of oxygen (dioxygen) reduction—oxygen-free radicals (OFR), which attacks not only the bases but also the deoxyribosyl backbone of DNA. Thanks to improvements in analytical techniques, a major achievement in the understanding of carcinogenesis in the past two decades has been the identification and quantification of various adducts of OFR with DNA. OFR are also known to attack other cellular components such as lipids, leaving behind reactive species that in turn can couple to DNA bases. Endogenous DNA lesions are genotoxic and induce mutations. The most extensively studied lesion is the formation of 8-OH-dG. This lesion is important because it is relatively easily formed and is mutagenic and therefore is a potential biomarker of carcinogenesis. Mutations that may arise from formation of 8-OH-dG involve GC → TA transversions. In view of these findings, OFR are considered as an important class of carcinogens. The effect of OFR is balanced by the antioxidant action of non-enzymatic antioxidants as well as antioxidant enzymes. Non-enzymatic antioxidants involve vitamin C, vitamin E, carotenoids (CAR), selenium and others. However, under certain conditions, some antioxidants can also exhibit a pro-oxidant mechanism of action. For example, β-carotene at high concentration and with increased partial pressure of dioxygen is known to behave as a pro-oxidant. Some concerns have also been raised over the potentially deleterious transition metal ion-mediated (iron, copper) pro-oxidant effect of vitamin C. Clinical studies mapping the effect of preventive antioxidants have shown surprisingly little or no effect on cancer incidence. The epidemiological trials together with in vitro experiments suggest that the optimal approach is to reduce endogenous and exogenous sources of oxidative stress, rather than increase intake of anti-oxidants. In this review, we highlight some major achievements in the study of DNA damage caused by OFR and the role in carcinogenesis played by oxidatively damaged DNA. The protective effect of antioxidants against free radicals is also discussed (Mol Cell Biochem 266: 37–56, 2004)

radicals DNA damage cancer incidence antioxidants pro-oxidants carotenoids oxidative stress review 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Marian Valko
    • 1
  • Mario Izakovic
    • 1
  • Milan Mazur
    • 1
  • Christopher J. Rhodes
    • 2
  • Joshua Telser
    • 3
  1. 1.Faculty of Chemical and Food TechnologySlovak Technical UniversityBratislavaSlovakia.
  2. 2.School of ChemistryUniversity of ReadingReadingUK
  3. 3.Chemistry ProgramRoosevelt UniversityChicagoUSA

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