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首页> 外文期刊>Environmental Science & Technology >Nonlethal Biomarkers of Oxidative Stress in Oiled Sediment Exposed Southern Flounder (Paralichthys lethostigma): Utility for Field-Base Monitoring Exposure and Potential Recovery
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Nonlethal Biomarkers of Oxidative Stress in Oiled Sediment Exposed Southern Flounder (Paralichthys lethostigma): Utility for Field-Base Monitoring Exposure and Potential Recovery

机译:暴露在南部比目鱼(Paralichthys lethostigma)中的油污沉积物中氧化应激的非致死生物标志物:用于实地监测暴露和潜在恢复的工具

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摘要

The Deepwater Horizon (DWH) blowout resulted in the deposition of toxic polycyclic aromatic hydrocarbons (PAHs), in the coastal sediments of the Gulf of Mexico. The immediate effects on an ecosystem from an oil spill are clearly recognizable, however the long-term chronic effects and recovery after a spill are still not well understood. Current methodologies for biomonitoring wild populations are invasive and mostly lethal. Here, two potential nonlethal biomonitoring tools for the assessment of PAH toxicity and induced biological alterations in the field, were identified using laboratory-validated methods. In this study, subadult southern flounder (Paralichthys lethostigma) were chronically exposed to DWH surrogate oiled sediments for 35 days; a subset of these exposed flounder were then provided a clean nonexposure period to ascertain the utility of selected biomarkers to monitor recovery post exposure. After chronic exposure, there was an increase in gene expression of cytochrome P450 1A but not glutathione S-transferase. There was also a notable imbalance of oxidants to antioxidants, measured as reduced glutathione, oxidized glutathione, and their ratio in the blood. Evidence of subsequent oxidative damage due to chronic exposure was found through lipid peroxidation and DNA damage assessments of liver, gill, and blood.
机译:深水地平线(DWH)井喷导致有毒的多环芳烃(PAH)在墨西哥湾的沿海沉积物中沉积。溢油对生态系统的直接影响是显而易见的,但是对溢油后的长期慢性影响和恢复仍然知之甚少。目前用于野生种群生物监测的方法是侵入性的,并且大多数是致命的。在这里,使用实验室验证的方法确定了两种潜在的非致死性生物监测工具,用于评估PAH毒性和在现场引起的生物学变化。在这项研究中,亚成年南部比目鱼(Paralichthys lethostigma)长期暴露于DWH替代油污沉积物中35天。然后为这些裸露的比目鱼的一个子集提供一个干净的非暴露期,以确定所选生物标记物在暴露后监测回收率的效用。长期暴露后,细胞色素P450 1A的基因表达增加,但谷胱甘肽S-转移酶没有增加。氧化剂与抗氧化剂之间也存在明显的不平衡,以还原型谷胱甘肽,氧化型谷胱甘肽及其在血液中的比例来衡量。通过脂质过氧化作用以及肝,腮和血液的DNA损伤评估,发现了由于长期暴露而导致随后的氧化损伤的证据。

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