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Environmentally relevant concentration of chromium activates Nrf2 and alters transcription of related XME genes in liver of zebrafish

机译:与环境相关的铬浓度会激活Nrf2并改变斑马鱼肝脏中相关XME基因的转录

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Fish is an excellent model to decipher the mechanism of toxicity of aquatic contaminants such as hexavalent chromium (Cr [VI]). The present study looked into the manifestation of stress in liver of zebrafish exposed to an environmentally relevant concentration (2 mg L-1), and the functioning of the cytoprotective machinery that pacifies the formed stress. The results lead us to hypothesize that oxidative stress plays a key role in chromium-induced toxicity resulting in lipid peroxidation and extensive changes in tissue ultrastructure. In treated fish, production of reactive oxygen species, increase in reduced glutathione content and increase in malondialdehyde content along with enhanced catalase activity were evident. Nuclear factor (erythroid-derived 2)-like 2 (Nrf2) was found to increase both at transcriptional and translational level and its translocation into the nucleus was confirmed by fluorescence-based immunohistochemical studies. The mRNA levels of genes like Nqo1, Cyp1a and Cu/Zn Sod were found to increase whereas Ho1, Hsp70 and Ucp2 were down-regulated. The sensitivity of these genes towards Cr [VI] validates their candidature as important biomarkers of Cr [VI] exposure in zebrafish. (C) 2018 Elsevier Ltd. All rights reserved.
机译:鱼是解释六价铬(Cr [VI])等水生污染物毒性机理的绝佳模型。本研究调查了暴露于环境相关浓度(2 mg L-1)的斑马鱼肝脏中的应激表现,以及缓解形成的应激的细胞保护机制的功能。结果使我们假设氧化应激在铬诱导的毒性中起关键作用,导致脂质过氧化和组织超微结构的广泛变化。在处理过的鱼中,活性氧种类的产生,减少的谷胱甘肽含量的增加和丙二醛含量的增加以及过氧化氢酶活性的增加是明显的。发现核因子(类胡萝卜素2)样2(Nrf2)在转录和翻译水平上均增加,并且通过基于荧光的免疫组织化学研究证实了其向核内的转运。发现Nqo1,Cyp1a和Cu / Zn Sod等基因的mRNA水平增加,而Ho1,Hsp70和Ucp2的基因下调。这些基因对Cr [VI]的敏感性证实了它们的候选资格是斑马鱼中Cr [VI]暴露的重要生物标记。 (C)2018 Elsevier Ltd.保留所有权利。

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