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.
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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:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Barry Halliwell
Barry Halliwell
中科院分区:
--
文献类型:
--
作者:
David A. Rowley;Barry Halliwell

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1. NADPH和铁氧还蛋白还原酶的混合物是体外还原阿霉素的方便方法。在有氧条件下,阿霉素半醌与O2迅速反应,产生超氧自由基。2.阿霉素:铁氧还蛋白还原酶或次黄嘌呤:黄嘌呤氧化酶产生的超氧化物可以促进可溶性铁螯合物存在下羟基自由基的形成。3.次黄嘌呤:黄嘌呤氧化酶系统在铁螯合物存在下产生的羟基自由基导致双链DNA的广泛断裂。过氧化氢酶、超氧化物歧化酶或去铁胺提供保护。4.将双链DNA加入阿霉素、铁氧还蛋白还原酶、NADPH和铁螯合物的混合物中,可抑制超氧自由基和羟基自由基的形成。这不是由于铁氧还蛋白还原酶的直接抑制,单链DNA具有弱得多的抑制作用。结论:阿霉素嵌入DNA不能被还原。
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.
根据抗肿瘤药物对含氧和缺氧肿瘤细胞的选择性毒性进行分类。
DOI: --
发表时间: 1981
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影响因子: 11.2
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