Microplastics aggravate the adverse effects of methylmercury than inorganic mercury on zebrafish (Danio rerio)

文献类型： 外文期刊

第一作者： Lei, Yajie

作者： Lei, Yajie;Li, Xue;Mao, Xuefei;Lei, Yajie;Li, Xue;Mao, Xuefei;Lei, Yajie

作者机构：

关键词： Microplastic; Mercury speciation; Combined toxicity; Zebrafish; Bioaccumulation; Metabonomics

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0269-7491

年卷期： 2025 年 367 卷

页码：

收录情况： SCI

摘要： The potential health risks of microplastics (MPs) and their combined exposure with heavy metals such as mercury (Hg) in aquatic environment are increasingly concerned recently. In this work, zebrafish embryos were exposed to different levels of polystyrene microplastics (PS-MPs, similar to 0.1 mu m) coupled with Hg(II) or/and MeHg at 20 mu g/L, to investigate the tissue biodistribution and accumulation of PS-MPs and Hg species, and their interaction, as well as embryo toxicity, oxidative stress and metabolic profiles. With zebrafish embryo development, PS-MPs were ingested and then primarily translocated to yolk sac, liver, and intestinal tissues, further acted as a significant vector for improving the bioaccumulation of MeHg vs. Hg(II). Whatever single or combined exposure of PS-MPs and Hg species, embryo disorders, such as delayed hatching, developmental abnormalities, and motor behavioral, and increased oxidative stress indications were obviously found. Herein, PS-MPs + MeHg aggravated oxidative stress compared with MeHg alone, which might been relevant to the high accumulation of Hg level in zebrafish larvae induced by PS-MPs. Non-targeted metabolomics results proved PS-MPs involvement disturbed lipid metabolism, amino acid metabolism, and energy metabolism compared with alone Hg(II) or MeHg exposure, of which excessive energy metabolism by activating the glycolysis process was found in PS-MPs + MeHg treatment. This work reveals the enhancement efficacy of PS-MPs on MeHg induced toxicity and adverse stress, further proving the differentiated effect of elemental chemical forms with microplastics. In the future, elemental species must be considered for the combined toxicity evaluation and ecological risk assessments of microplastics and heavy metals.

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