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82

PABLO LOPEZ-BERGAMI AND ZE’EV RONAI

7. DNA DAMAGE FROM OXIDATIVE STRESS

Reactive oxygen species, generated as by-products of cellular metabolism (i.e., energy produced from mitochondria), are part of an antimicrobial or antiviral response, as are detoxification reactions carried out by the cytochrome P-450 system. Both antitumor and environmental agents (e.g., UV, IR, redox chemicals, and cigarette smoke) also readily generate reactive oxygen species. Oxidative stress occurs when levels of reactive oxygen species exceed the body’s natural antioxidant defense mechanisms.

The result is damage to biomolecules such as lipids, proteins, and DNA. Reactive oxygen species include superoxide anion radical (O2), singlet oxygen (O2), hydrogen peroxide (H2O2), and the highly reactive hydroxyl radical (OH). Superoxide and hydrogen peroxide are normally not reactive toward DNA. However, in the presence of ferrous or cuprous ion, both superoxide and hydrogen peroxide are converted to highly reactive hydroxyl radicals that induce multiple DNA modifications. DNA damage induced by reactive oxygen species includes a range of specifically oxidized purines and pyrimidines, alkali labile sites, single-strand breaks, base and nucleotide modifications, and instability formed directly or by repair processes. Reactive oxygen species also induce a number of covalent modifications to DNA, such as interand intrastrand cross-links and proteinDNA cross-links.

Because some of these lesions possess mutagenic properties, they may lead to carcinogenesis if not repaired. An oxidized form of guanine, 8-hydroxydeoxy- guanosine, is readily bypassed by DNA polymerase and is the major oxidative product resulting from damaged DNA that produces mutations (A:T to C:C or G:C to T:A transversion mutations) because it pairs with either adenine or cytosine bases. In human tumors, G to T transversions are the most frequent mutations found on the p53 suppressor gene. Oxidative modification of DNA is repaired by a ubiquitous base-excision repair pathway. At least in mammals, the response to oxidative stress involves p53. Recent studies reveal that reactive oxygen species act as both an upstream signal that activates p53 and as a downstream factor that mediates apoptosis and growth arrest. Thus DNA damage induced by reactive oxygen species leads to p53 activation, growth arrest, and apoptosis.

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