Accumulation and detoxification dynamics of microcystin-LR and antioxidant responses in male red swamp crayfish Procambarus clarkii

文献类型： 外文期刊

第一作者： Yuan, Julin

作者： Yuan, Julin;Zhang, Yingying;Gao, Jiancao;Chen, Shu;Wang, Zaizhao;Yuan, Julin;Gu, Zhimin;Zheng, Yao;Zheng, Yao

作者机构：

关键词： Procambarus clarkii; Microcystin-LR; Accumulation; Detoxification; Antioxidation

期刊名称：AQUATIC TOXICOLOGY （ 影响因子：4.964； 五年影响因子：5.071 ）

ISSN： 0166-445X

年卷期： 2016 年 177 卷

页码：

收录情况： SCI

摘要： MC-LR is one of major microcystin isoforms with potent hepatotoxicity. In the present study, we aim to: 1) explore the dynamics of MC-LR accumulation and elimination in different tissues of male red swamp crayfish Procambarus clarkii; 2) reveal the mechanisms underlying hepatic antioxidation and detoxification. In the semi-static toxicity tests under the water temperature of 25 +/- 2 degrees C, P. clarkii were exposed to 0.1, 1, 10 and 100 mu g/L MC-LR for 7 days for accumulation and subsequently relocated to freshwater for another 7 days to depurate MC-LR. MC-LR was measured in the hepatopancreas, intestine, abdominal muscle and gill by HPLC. The enzyme activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione S-transferase (GST), content of glutathione (GSH), and transcripts of Mn-sod, cat, gpxl, Mu-gst, heat shock protein90 (hsp90), hsp70 and hsp60 in hepatopancreas were detected. The results showed that P. clarkii accumulated more MC-LR in intestine, and less in abdominal muscle and gill during accumulation period and eliminated the toxin more quickly in gill and abdominal muscle, and comparatively slowly in intestine during depuration period. The fast increase of SOD and CAT activities at early stage, subsequent decrease at later stage of accumulation period and then fast increase during depuration period were partially consistent with the transcriptional changes of their respective genes. GPx was activated by longer MC-LR exposure and gpxl mRNA expression showed uncoordinated regulation pattern compared with its enzyme. Hsp genes were up-regulated when P. clarkii was exposed to MC-LR. (C) 2016 Elsevier B.V. All rights reserved.

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