Effects of microplastics on the accumulation and neurotoxicity of methylmercury in zebrafish larvae

Zhu Jun; Zhang Yi; Xu YawenWang LiWu QianZhang ZhanLi Lei

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Effects of microplastics on the accumulation and neurotoxicity of methylmercury in zebrafish larvae

机译：Effects of microplastics on the accumulation and neurotoxicity of methylmercury in zebrafish larvae

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Microplastics (MPs) and methylmercury (MeHg) have attracted increasing attention due to ubiquitous occurrence and toxicity. This study aimed to investigate whether MPs could absorb MeHg and thus modify its bio-concentration and neurotoxicity in the zebrafish larvae (Danio rerio). The pseudo-second-order model (R-2 = 0.989) was found to be suitable for describing the adsorption kinetics of MeHg onto MPs. Compared with Freundlich and Temkin models, the Langmuir isotherm model provided a better fit with the experimental data exhibiting a maximum monolayer adsorption capacity of 54.945 mg/g. These results suggested that adsorption occurs mainly by a chemical process dominated by monolayer adsorption. MPs adsorbed MeHg to form MPs/ MeHg complex, which was ingested by zebrafish larvae, and promoted accumulation of MeHg. Thus, the presence of MPs aggravated the reduction of locomotor activity induced by MeHg, and downregulation of neuro-transmitters related genes, such as ache, gfap and scl1A3b. Metabolome analysis also revealed disrupted glutathione (GSH) metabolism upon exposure of MeHg alone and in combination with MPs, as reflected by the increased in the ratio of GSH and oxidized glutathione. These effects were also confirmed by upregulation of oxidative stress-related genes, such as sod, sod mt and gpx4a. Collectively, these results indicated that MPs could act as a carrier of MeHg and enhance its accumulation in zebrafish, thereby disrupting locomotor activity by excessive oxidative stress. This study provides a scientific basis for improving health risk assessment of environmental pollutants, particularly those potentially able to adsorb to MPs by virtue of their chemical nature.

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《Marine environmental research》 |2022年第4期|105615.1-105615.9|共9页
作者
Zhu Jun; Zhang Yi; Xu YawenWang LiWu QianZhang ZhanLi Lei;
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作者单位

Nanjing Med Univ, Ctr Global Hlth, Sch Publ Hlth, 101 Longmian Ave, Nanjing 211166, Jiangsu, Peoples R China;

Nanjing Med Univ, Sch Publ Hlth, Key Lab Modern Toxicol, Minist Educ, 101 Longmian Ave, Nanjing 211166, Jiangsu, Peoples R China;

Nanjing Med Univ, Ctr Global Hlth, Sch Publ Hlth, 101 Longmian Ave, Nanjing 211166, Jiangsu, Peoples R China|Nanjing Med Univ, Sch Publ Hlth, Key Lab Modern Toxicol, Minist Educ, 101 Longmian Ave, Nanjing 211166, Jiangsu, Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类
关键词
Microplastics; Methylmercury; Zebrafish; Adsorption; Neurotoxicity; Metabonomics; Gene expression; Accumulation;

Effects of microplastics on the accumulation and neurotoxicity of methylmercury in zebrafish larvae

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