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• W2000227924 endingPage "1260" @default.
• W2000227924 startingPage "1255" @default.
• W2000227924 abstract "The genetic toxicity of the antitumour antibiotic bleomycin (BLM) is thought to involve the formation of a reactive oxygen intermediate. 8-Oxo-7,8-dihydrodeoxyguanosine (oxo8dG), an oxidation product of deoxyguanosine, is one of the major products formed when isolated DNA is exposed to oxygen radical generating systems. Gamma-irradiation (10-500 Gy 60Co; 10 Gy/min) or BLM and Fe2+ (37.5-150 U/L and 0.5 mM, respectively) treatment of isolated DNA (0.25 mg/mL) increased oxo8dG above background. In the latter case, the effect was greater than that with Fe2+ (0.5 mM) alone and was dependent on the dose of BLM. When DNA was irradiated with 500 Gy60Co, deoxyguanosine oxidation was inhibited by antioxidants (ethanol: 37.5 and 98% inhibition at 2 and 20 mM, respectively; mannitol: 20.5, 60 and 92% inhibition at 0.1, 1.0 and 10 mM, respectively). Similarly the BLM-induced production of oxo8dG was inhibited (64%) by mannitol (10 mM). BLM also caused production of base propenals on interaction with isolated DNA. In contrast, oxo8dG was not induced above background concentration (27 mol oxo8dG/10(6) mol dG) in permeabilized (37 degrees) and non-permeabilized (4 degrees and 37 degrees) rat hepatocytes treated with BLM (260 U/L). Despite this, there was extensive BLM-induced unscheduled DNA synthesis (10 and 100 U/L) in non-permeabilized rat and human hepatocytes in the absence of hydroxyurea. These findings, in accord with other observations, draw into question the role of .OH in BLM-induced DNA damage and the mimicry of ionizing radiation in cellular systems." @default.
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• W2000227924 date "1992-10-01" @default.
• W2000227924 modified "2023-10-14" @default.
• W2000227924 title "Bleomycin-induced unscheduled DNA synthesis in non-permeabilized human and rat hepatocytes is not paralleled by 8-oxo-7,8-dihydrodeoxyguanosine formation" @default.
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• W2000227924 doi "https://doi.org/10.1016/0006-2952(92)90523-l" @default.
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