DNA damage by superoxide-generating systems in relation to the mechanism of action of the anti-tumour antibiotic adriamycin.
DNA damage by superoxide-generating systems in relation to the mechanism of action of the anti-tumour antibiotic adriamycin.
复制标题
超氧化物生成系统对 DNA 的损伤与抗肿瘤抗生素阿霉素的作用机制有关。
DOI:
10.1016/0304-4165(83)90365-3
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发表时间:
1983
期刊:
影响因子:
--
通讯作者:
Barry Halliwell
中科院分区:
文献类型:
--
作者:
David A. Rowley;Barry Halliwell
1. A mixture of NADPH and ferrodoxin reductase is a convenient way of reducing adriamycin in vitro. Under aerobic conditions the adriamycin semiquinone reacts rapidly with O2and superoxide radical is produced. 2. Superoxide generated either by adriamycin:ferredoxin reductase or by hypoxanthine: xanthine oxidase can promote the formation of hydroxyl radicals in the presence of soluble iron chelates. 3. Hydroxyl radicals produced by a hypoxanthine:xanthine oxidase system in the presence of an iron chelate cause extensive fragmentation in double-stranded DNA. Protection is offered by catalase, superoxide dismutase or desferrioxamine. 4. Addition of double-stranded DNA to a mixture of adriamycin, ferredoxin reductase, NADPH and iron chelate inhibits formation of both superoxide and hydroxyl radicals. This is not due to direct inhibition of ferredoxin reductase and single-stranded DNA has a much weaker inhibitory effect. It is concluded that adriamycin intercalated into DNA cannot be reduced.
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