Neurotoxicity of Combined Exposure to the Heavy Metals (Pb and As) in Zebrafish (Danio rerio)

文献类型： 外文期刊

第一作者： Liu, Ming

作者： Liu, Ming;Li, Guangyu;Liu, Haoling;Zuo, Junli;Zheng, Wenting;Luan, Ning;Deng, Ping;Cui, Wenwen;Zhang, Huixian;Chen, Xin;Yao, Jingjing;Peng, Xitian;Peng, Lijun;Liu, Jiao;Yan, Wei

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关键词： zebrafish; heavy metals; co-exposure; neurotoxicity; neurotransmitter; HPI axis

期刊名称：TOXICS （ 影响因子：4.6； 五年影响因子：4.8 ）

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年卷期： 2024 年 12 卷 4 期

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收录情况： SCI

摘要： Lead (Pb) and arsenic (As) are commonly occurring heavy metals in the environment and produce detrimental impacts on the central nervous system. Although they have both been indicated to exhibit neurotoxic properties, it is not known if they have joint effects, and their mechanisms of action are likewise unknown. In this study, zebrafish were exposed to different concentrations of Pb (40 mu g/L, 4 mg/L), As (32 mu g/L, 3.2 mg/L) and their combinations (40 mu g/L + 32 mu g/L, 4 mg/L + 3.2 mg/L) for 30 days. The histopathological analyses showed significant brain damage characterized by glial scar formation and ventricular enlargement in all exposed groups. In addition, either Pb or As staining inhibited the swimming speed of zebrafish, which was enhanced by their high concentrations in a mixture. To elucidate the underlying mechanisms, we examined changes in acetylcholinesterase (AChE) activity, neurotransmitter (dopamine, 5-hydroxytryptamine) levels, HPI axis-related hormone (cortisol and epinephrine) contents and neurodevelopment-related gene expression in zebrafish brain. The observations suggest that combined exposure to Pb and As can cause abnormalities in swimming behavior and ultimately exacerbate neurotoxicity in zebrafish by interfering with the cholinergic system, dopamine and 5-hydroxytryptamine signaling, HPI axis function as well as neuronal development. This study provides an important theoretical basis for the mixed exposure of heavy metals and their toxicity to aquatic organisms.

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