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Effects of diclofenac on the expression of Nrf2 and its downstream target genes in mosquito fish (Gambusia affinis)

文献类型： 外文期刊

作者： Bao, Shuang 1 ; Nie, Xiangping 1 ; Ou, Ruikang 1 ; Wang, Chao 1 ; Ku, Peijia 1 ; Li, Kaibing 2 ;

作者机构： 1.Jinan Univ, Dept Ecol, Hydrobiol Res Inst, Guangzhou 510632, Guangdong, Peoples R China

2.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Guangzhou 510380, Guangdong, Peoples R China

关键词： Diclofenac;Mosquito fish;Nrf2;Oxidative stress

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

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收录情况： SCI

摘要： Diclofenac (DCF) is one of widely used non-steroidal anti-inflammatory drugs. Recently, this drug has been universally detected in aquatic environment. However, its potential adverse effects and oxidative stress toxic mechanisms on fish remain unclear. In the present study, we first cloned the crucial partial sequences of some key oxidative stress related genes, which include NF-E2-related factor 2 (Nrf2), NAD(P)H: quinoneoxidor-eductase (NQO1), glutamate-cysteine ligase catalytic subunit (GCLC), Cu-Zn superoxide dismutase (SOD2), catalase (CAT), alpha-glutathione S-transferase (GSTA), and UDP-glucuronosyltransferases (UGT) in mosquito fish (Gambusia affinis). We also deduced amino acids of Nrf2 and then constructed the phylogenetic trees of Nrf2, NQO1 and GCLC, respectively. Results showed that a high identity percentage was founded between G. affinis and other bony fish species, such as Xiphophorus maculates and Poecilia reticulate. The transcriptional expression of these genes and partly related enzymes activities were then investigated under the included environmental relevant concentration DCF exposure (0 mu mol L-1, 1.572 x 10(-3) mu mol L-1, 1.572 x 10(-2) mu mol L-1, 0.1572 mu mol L-1 and 1.572 mu mol L-1) for 24 h and 168 h. The expression of Nrf2 was inhibited at 24 h but induced at 168 h, exhibiting a significant time and/or dose-effect relationship under DCF exposure. Similar observation was found in its downstream target genes. However, Nrf2-mediated antioxidant enzymes activities displayed differently under the same concentration of DCF exposure for the same time. Under DCF exposure for 168 h, the genes exhibited dramatic induction trend, but there were no significant changes in enzyme activities and MDA content. Overall, mRNA responses were more sensitive than enzyme changes in mosquito fish under DCF exposure.

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