Doxorubicin inhibits oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) by a lactoperoxidase/H(2)O(2) system by reacting with ABTS-derived radical.

Doxorubicin inhibits oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) by a lactoperoxidase/H(2)O(2) system by reacting with ABTS-derived radical.
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Doxorubicin 通过与 ABTS 衍生的自由基反应,抑制乳过氧化物酶/H(2)O(2) 系统对 2,2-azino-bis(3-乙基苯并噻唑啉-6-磺酸盐) (ABTS) 的氧化。

DOI:
10.1016/j.abb.2007.06.027
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发表时间:
2007
影响因子:
3.9
通讯作者:
Britigan,BradleyE
Britigan,BradleyE
中科院分区:
生物学3区
文献类型:
--
作者:
Reszka,KrzysztofJ;Britigan,BradleyE

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研究了阿霉素对乳过氧化物酶和过氧化氢氧化2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate)(ABTS)的影响。结果表明:(1)阿霉素对ABTS+的氧化为自由基阳离子(Abts+)有明显的抑制作用,其滞后期的持续时间取决于阿霉素的浓度;(2)阿霉素的抑制作用是由于阿霉素对ABTS+自由基的还原(化学计量比为1:1.8);(3)阿霉素的氧化伴随着阿霉素的氧化,只有当阿霉素的浓度降到接近零时,才能检测到ABTS的净氧化;(4)阿霉素的氧化导致其降解为3-甲氧基水杨酸和3-甲氧基邻苯二甲酸;(5)阿霉素对ABTS+的猝灭效果与对苯二酚、谷胱甘肽和Trolox C相似。这些观察结果支持了阿霉素在一定条件下可以作为抗氧化剂的断言。他们还提出,阿霉素与氧化剂的相互作用可能会导致其氧化降解。
The effect of doxorubicin on oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) by lactoperoxidase and hydrogen peroxide has been investigated. It was found that: (1) oxidation of ABTS to its radical cation (ABTS+) is inhibited by doxorubicin as evidenced by its induction of a lag period, duration of which depends on doxorubicin concentration; (2) the inhibition is due to doxorubicin hydroquinone reducing the ABTS+radical (stoichiometry 1: 1.8); (3) concomitant with the ABTS+reduction is oxidation of doxorubicin; only when the doxorubicin concentration decreases to a near zero level, net oxidation of ABTS could be detected; (4) oxidation of doxorubicin leads to its degradation to 3-methoxysalicylic acid and 3-methoxyphthalic acid; (5) the efficacy of doxorubicin to quench ABTS+is similar to the efficacy of p-hydroquinone, glutathione and Trolox C. These observations support the assertion that under certain conditions doxorubicin can function as an antioxidant. They also suggest that interaction of doxorubicin with oxidants may lead to its oxidative degradation.
乳过氧化物酶亚硝酸盐刺激催化机制。
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蒽环类抗癌药物柔红霉素和阿霉素的过氧化物酶和亚硝酸盐依赖性代谢。
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乳过氧化物酶催化H2O2代谢和不可逆酶失活的分子机制研究。
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以 ABTS 作为色原的乳过氧化物酶的稳态动力学。
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发表时间: 1975
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