Cellular metabolism of proxyl nitroxides and hydroxylamines.

Cellular metabolism of proxyl nitroxides and hydroxylamines.
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代理硝基氧和羟胺的细胞代谢。

DOI:
10.1016/0304-4165(91)90139-8
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发表时间:
1991
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Swartz,H
Swartz,H
中科院分区:
--
文献类型:
--
作者:
Sentjurc,M;Pecar,S;Chen,K;Wu,M;Swartz,H

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以前来自模型系统的数据表明,proxyl氮氧化物应该特别抵抗生物还原,因此可以有效地解决氮氧化物的这个经常有问题的特性。因此,我们研究了细胞和通常的模型系统抗坏血酸对四种proxyl氮氧化物和三种参比氮氧化物的还原速率。我们发现,虽然抗坏血酸对proxyl nitrooxide的还原速率比原型pyrolidine nitrooxide (PCA)的还原速率慢,但细胞的还原速率正好相反。我们还研究了相应羟胺的氧化速率。酰基羟胺的细胞氧化速率相对较快,特别是对最亲脂的衍生物。这些结果表明:(i)在功能性生物系统中,丙基氮氧化物可能没有异常的抗生物还原能力;(ii)细胞和组织中氮氧化物和羟胺代谢的相对速率的准确知识需要在这些系统中进行直接研究,因为这些速率可能与在模型(化学)系统中观察到的速率不太接近;(iii)通过其对应羟胺的氧化速率,丙基氮氧化物显示出作为测量氧浓度的潜在价值。
Previous data from model systems indicated that the proxyl nitroxides should be especially resistant to bioreduction and therefore could be an effective to this often problematic characteristic of nitroxides. Therefore, we investigated the rate of reduction by cells and by the usual model system, ascorbate, of four proxyl nitroxides and three reference nitroxides. We found that, while the rate of reduction by ascorbate of the proxyl nitroxides was slower than the rate of a prototypic pyrrolidine nitroxide (PCA), the reverse was true for reduction by cells. We also studied the rate of oxidation of the corresponding hydroxylamines. The rate of oxidation by cells of the proxyl hydroxylamines was relatively fast, especially for the most lipophilic derivative. These results indicate that: (i) proxyl nitroxides may not be unusually resistant to bioreduction by functional biological systems; (ii) accurate knowledge of relative rates of metabolism of nitroxides and hydroxylamines in cells and tissues will require direct studies in these systems because the rates may not closely parallel those observed in model (chemical) systems; and (iii) proxyl nitroxides show potential value as agents to measure oxygen concentrations by the rates of oxidation of their corresponding hydroxylamines.
DOI: 10.1016/0167-4889(86)90073-x
发表时间: 1986-08
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影响因子: --
作者:
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DOI: 10.1097/00004424-198808000-00013
发表时间: 1988
影响因子: 6.7
作者:
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DOI: 10.1002/9780470110492.ch5
发表时间: 1983
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影响因子: --
作者:
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通讯作者: Swartz,SM
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发表时间: 1987-07-01
影响因子: 3.9
作者:
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通讯作者: PACKER, L