Mechanistic aspects of paraquat toxicity in E. coli. A spin trapping study.

Mechanistic aspects of paraquat toxicity in E. coli. A spin trapping study.
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百草枯对大肠杆菌的毒性机制。

DOI:
10.1016/0006-2952(89)90666-7
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发表时间:
1989
影响因子:
5.8
通讯作者:
Chevion,M
Chevion,M
中科院分区:
医学2区
文献类型:
--
作者:
Sion,A;Samuni,A;Chevion,M

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百草枯一价阳离子自由基(PQ.+和铜参与百草枯毒性的研究。大肠杆菌B细胞。电子自旋共振(ESR)谱结合细胞存活的研究来探讨自由基的产生和生物损伤之间的关系。用增宽剂铬酸根(CrOx)表征PQ+的缺氧分配。在细胞内外。在CrOx存在下,ESR信号完全消除,表明细胞内物质不可检测,与以前的报道相反,PQ.+只在细胞外聚集。PQ.+自由基不与H2O2反应,但在H2O2存在下消失时,催化痕量的Cu(II)存在。使用DMPO的自旋捕获研究表明,在有氧环境中,百草枯诱导的O2−自由基仅在细胞外室中可检测到。PQ.+之间的关系外观和生物损伤并不简单。PQ.+在没有氧气和Cu(II)或H2O2的情况下,无毒地积累。与此相反,H2O2和Cu(II)都能迅速杀死细胞,但PQ.+不可检测这些结果再次证实了过渡金属在百草枯毒性中的关键催化介导功能。
Mechanistic aspects of paraquat monocation radical (PQ.+and copper involvement in paraquat toxicity have been examined usingE. coli Bcells. Electron spin resonance (ESR) spectrometry combined with cell survival studies were used to explore the correlation between radical production and biological damage. The line broadening agent oxalato-chromiate (CrOx) was used to characterize the anoxic partition of PQ.+inside and outside the cell. In the presence of CrOx the ESR signal was totally eliminated, indicating that intracellular species were undetectable and that, contrary to previous reports, PQ.+exclusively accumulates outside the cell. The PQ.+radical does not react with H2O2but disappears in the presence of H2O2when catalytic traces of Cu(II) are present. Spin-trapping studies using DMPO showed that in aerobic environment paraquat-induced O2−radicals are detectable exclusively in the extracellular compartment. The correlation between PQ.+appearance and the biological damage is not simple. PQ.+non-toxically accumulates, in the absence of oxygen and either Cu(II) or H2O2. By contrast, with both H2O2and Cu(II) the cells are rapidly killed but PQ.+was undetectable. These results reconfirm the key catalytic mediatory function of transition metals in paraquat toxicity.
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影响因子: --
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发表时间: 1985
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作者:
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DOI: --
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期刊: The Journal of biological chemistry
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