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首页> 外文期刊>Environmental toxicology and chemistry >EXAMINATION OF THE MECHANISM OF PHENANTHRENEQUINONE TOXICITY TO VIBRIO FISCHERI: EVIDENCE FOR A REACTIVE OXYGEN SPECIES-MEDIATED TOXICITY MECHANISM
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EXAMINATION OF THE MECHANISM OF PHENANTHRENEQUINONE TOXICITY TO VIBRIO FISCHERI: EVIDENCE FOR A REACTIVE OXYGEN SPECIES-MEDIATED TOXICITY MECHANISM

机译:菲苯醌对费氏弧菌的毒性机理研究:反应性氧介导的毒性机理的证据

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摘要

Phenanthrenequinone (PHQ) is a photoproduct of phenanthrene, one of the most prevalent polycyclic aromatic hydrocarbons in the environment. Phenanthrenequinone is a compound of substantial interest, because its toxicity can be much greater than its parent chemical to aquatic organisms. The toxicity mechanisms of PHQ to the luminescent marine bacterium Vibrio fischeri were examined in the present study. Phenanthrenequinone can redox cycle in bacterial cells and transfer electrons to O_2. enhancing the production of superoxide (O·_2-), hydrogen peroxide (H_2O_2). and other reactive oxygen species (ROS). Exposure of cells to PHQ increased activity of superoxide dismutase (SOD), which detoxifies the ROS superoxide. Concentrations of PHQ that induced the production of H_2O_2 and other ROS, as well as the elevated levels of Fe-SOD. were correlated with its toxicity as measured by luminescence. Furthermore, toxicity of PHQ to V. fischeri was lowered under the anaerobic conditions, suggesting that the absence of oxygen, which would limit the production of ROS, alleviated toxicity of PHQ. Thus, a ROS-mediated toxicity mechanism of PHQ is highly implicated by in the present study.
机译:菲醌(PHQ)是菲的光产物,菲是环境中最普遍的多环芳烃之一。菲醌是备受关注的化合物,因为它对水生生物的毒性可能远大于其母体化学品。在本研究中检查了PHQ对发光的海洋细菌费氏弧菌的毒性机理。菲醌可以在细菌细胞中氧化还原循环并将电子转移到O_2。增强了超氧化物(O·_2-),过氧化氢(H_2O_2)的产生。和其他活性氧(ROS)。将细胞暴露于PHQ会增加超氧化物歧化酶(SOD)的活性,从而使ROS超氧化物解毒。引起H_2O_2和其他ROS产生的PHQ浓度以及Fe-SOD含量升高。通过发光测量其毒性。此外,在厌氧条件下,PHQ对费氏弧菌的毒性降低了,这表明缺氧会限制ROS的产生,从而减轻了PHQ的毒性。因此,本研究高度涉及ROS介导的PHQ的毒性机制。

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