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
中科院分区:
文献类型:
--
作者:
Sion,A;Samuni,A;Chevion,M
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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DOI:
10.1016/s0021-9258(17)42691-3
发表时间:
1984-12
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
J. V. van Mourik;D. Lawrence;D. Loskutoff
通讯作者:
J. V. van Mourik;D. Lawrence;D. Loskutoff
影响因子:
2.9
作者:
Erickson,LA;Lawrence,DA;Loskutoff,DJ
通讯作者:
Loskutoff,DJ
DOI:
10.1073/pnas.82.24.8710
发表时间:
1985
影响因子:
11.1
作者:
Erickson,LA;Hekman,CM;Loskutoff,DJ
通讯作者:
Loskutoff,DJ
DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Hekman,CM;Loskutoff,DJ
通讯作者:
Loskutoff,DJ
DOI:
10.1002/path.1700930238
发表时间:
1967
期刊:
The Journal of pathology and bacteriology
影响因子:
--
作者:
J. Henrichsen;T. Astrup
通讯作者:
T. Astrup