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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 10
BKCSDE 31(10)
October 20, 2010

Title	Oxidative Damage of DNA Induced by Ferritin and Hydrogen Peroxide
Author	Jung Hoon Kang
Keywords	Ferritin, DNA, Hydroxyl radical, Mutation
Abstract	Excess free iron generates oxidative stress that may contribute to the pathogenesis of various causes of neurodegenerative diseases. Previous studies have shown that one of the primary causes of increased brain iron may be the release of excess iron from intracellular iron storage molecules. In this study, we attempted to characterize the oxidative damage of DNA induced by the reaction of ferritin with H₂O₂. When DNA was incubated with ferritin and H₂O₂, DNA strand breakage increased in a time-dependent manner. Hydroxyl radical scavengers strongly inhibited the ferritin/H₂O₂ system-induced DNA cleavage. We investigated the generation of hydroxyl radical in the reaction of ferritin with H₂O₂ using a chromogen, 2,2'-azinobis-(2-ethylbenzthiazoline-6-sulfonate) (ABTS), which reacted with ·OH to form ABTS^+?. The initial rate of ABTS^+? formation increased as a function of incubation time. These results suggest that DNA strand breakage is mediated in the reaction of ferritin with H₂O₂ via the generation of hydroxyl radicals. The iron-specific chelator, deferoxamine, also inhibited DNA cleavage. Spectrophotometric study using a color reagent showed that the release of iron from H₂O₂-treated ferritin increased in a time-dependent manner. Ferritin enhanced mutation of the lacZ' gene in the presence of H₂O₂ when measured as a loss of α-complementation. These results indicate that ferritin/H₂O₂ system-mediated DNA cleavage and mutation may be attributable to hydroxyl radical generation via a Fenton-like reaction of free iron ions released from oxidatively damaged ferritin.
Page	2873 - 2876
Full Text	PDF

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