Abstract
The response of the copepod (Tigriopus japonicus Mori) to cadmium (Cd) additions was investigated under laboratory-controlled conditions in a 12-day exposure. Superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione-S-transferase (GST), acetylcholinesterase (AchE), reduced glutathione (GSH), the ratio of reduced to oxidized glutathione (GSH/GSSG), and metallothionein (MT) were analyzed for Cd treatments (0, 10, 20, 40, and 100 μg/L) after exposure for 1, 4, 7, and 12 days. Additionally, thiobarbituric reactive species assay was used to evaluate lipid peroxidation (LPO) of the copepod after the 12-day exposure. The results indicated that Cd treatments significantly influenced the biochemical indexes (SOD, GPx, GST, AchE, GSH, and GSH/GSSG) after certain exposure times. Exposure to Cd induced LPO in the treated copepods, hinting that the copepods had suffered from oxidative damage. During exposure, the Cd initiated an induced MT synthesis in the copepods by day 7, which peaked at day 12 and which was probably responsible for Cd detoxification. Thus, Cd exposure significantly affected the detoxification process and antioxidant system of this copepod, and T. japonicus could be used as a suitable bioindicator of exposure to Cd using SOD, GPx, GST, LPO, and GSH/GSSG as biomarkers.
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The work was funded by the National Natural Science Foundation of China (No. 40806051). Professor John Hodgkiss is thanked for his assistance with English in an earlier draft of this article.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00244-009-9412-x
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Wang, MH., Wang, GZ. Biochemical Response of the Copepod Tigriopus japonicus Mori Experimentally Exposed to Cadmium. Arch Environ Contam Toxicol 57, 707–717 (2009). https://doi.org/10.1007/s00244-009-9319-6
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DOI: https://doi.org/10.1007/s00244-009-9319-6