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• W1995414431 abstract "Some of the properties of cellular iron species which react with H2O2 to cause DNA single-strand breaks in HL-60 cells were characterized in control cells and in cells made deficient of iron using 4,7-phenylsulfonyl-1,10-phenanthroline (bathophenanthroline disulfonic acid or BPS) and ascorbate. Single-strand breaks were measured using alkaline elution of DNA of cells treated at 4 degrees to minimize repair during treatment. Strand breakage in the presence of 10% serum was only 40% of that in the absence of serum. This effect was traced to reaction of H2O2 with metals, most likely iron, in serum. Dimethyl sulfoxide (Me2SO) inhibited a maximum of 65% of breaks in control cells. The diffusion distance from the site of generation of hydroxyl radicals to the site of reaction with DNA for the Me2SO-inhibitable fraction was 6.9 nm. There was no significant alteration in the fraction of Me2SO-inhibitable strand breaks or in diffusion distance in iron-deficient cells, though total strand breaks decreased by 70%. When the effect of extracellular iron in serum was taken into account, 60 microM orthophenanthroline (OP) inhibited a maximum of 85% of strand breaks. In cells pretreated with 60 microM OP, the Me2SO-inhibitable fraction of the remaining strand breaks decreased to 32%, while the diffusion distance decreased to 4.1 nm. These data indicate the existence of a number of different iron species, as characterized by overlapping but not coincidental inhibition by OP and Me2SO, and by differing diffusion distances." @default.
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• W1995414431 creator A5063688377 @default.
• W1995414431 date "1996-01-01" @default.
• W1995414431 modified "2023-09-23" @default.
• W1995414431 title "Evidence for involvement of multiple iron species in DNA single-strand scission by H2O2 in HL-60 cells" @default.
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• W1995414431 doi "https://doi.org/10.1016/0891-5849(96)02097-7" @default.
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