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首页> 外文期刊>Fisheries and Aquatic Sciences >Thermal Effects on Bioaccumulation and Antioxidant Enzyme Response in the Liver and Gills of Tilapia Oreochromis niloticus Exposed to Arsenic
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Thermal Effects on Bioaccumulation and Antioxidant Enzyme Response in the Liver and Gills of Tilapia Oreochromis niloticus Exposed to Arsenic

机译：热作用对暴露于砷的罗非鱼尼罗罗非鱼肝脏和G中生物积累和抗氧化酶响应的热效应

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摘要

The effects of waterborne arsenic (As) exposure on bioaccumulation and antioxidant defenses were examined in the liver and gills of tilapia, Oreochromis niloticus, under thermal stress. Tilapia were exposed to different As concentrations (0, 200, and ) at three water temperatures (20, 25, and ) for 20 days. After As exposure, higher levels of As accumulation were observed in the gills compared with the liver in elevated water temperatures. In terms of the antioxidant response, glutathione (GSH) levels and the activities of glutathione reductase (GR), glutathione peroxidase (GPx), and glutathione S-transferase (GST) significantly decreased in the liver and gills of tilapia exposed to As for 20 days, regardless of the As concentration (200 and ) or water temperature. These enzyme activities exhibited greater fluctuations in the liver and gills of tilapia after As exposure in water warmer than . The present findings suggest that the simultaneous stress of temperature change and As exposure can accelerate As accumulation and alter the antioxidant enzymes activities of tilapia.
机译：在热应激下，在罗非鱼的肝脏和g中，检测了水暴露于砷对生物积累和抗氧化防御的影响。罗非鱼在三种水温（20、25和）下暴露于不同的砷​​浓度（0、200和）下达20天。在砷暴露后，在升高的水温下，与肝脏相比，g中的砷积累水平更高。就抗氧化反应而言，暴露于As的罗非鱼肝和20中，谷胱甘肽（GSH）的水平和谷胱甘肽还原酶（GR），谷胱甘肽过氧化物酶（GPx）和谷胱甘肽S-转移酶（GST）的活性显着降低，持续20天天，无论As浓度（200和）或水温如何。在比水温高的水中暴露后，这些酶活性在罗非鱼的肝脏和罗非鱼g中表现出更大的波动。目前的发现表明，温度变化和砷暴露同时引起的压力可以加速砷的积累并改变罗非鱼的抗氧化酶活性。

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