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Effects of exposure to waterborne polystyrene microspheres on lipid metabolism in the hepatopancreas of juvenile redclaw crayfish, Cherax quadricarinatus

文献类型： 外文期刊

作者： Chen, Qiang 1 ; Lv, Weiwei 2 ; Jiao, Yang 1 ; Liu, Zhiquan 1 ; Li, Yiming 1 ; Cai, Mingqi 1 ; Wu, Donglei 1 ; Zhou, Wenzo 1 ;

作者机构： 1.East China Normal Univ, Sch Life Sci, Shanghai 200241, Peoples R China

2.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

3.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200241, Peoples R China

关键词： Polystyrene microspheres; Cherax quadricarinatus; Hepatopancreas; Lipid metabolism

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

ISSN： 0166-445X

年卷期： 2020 年 224 卷

页码：

收录情况： SCI

摘要： Previous research has identified microplastics as new environmental pollutants that are widely distributed in a variety of environments, including aquaculture environments. However, the potential hazard of microplastics to aquaculture animals, especially toward lipid metabolism involved with the survival and growth of aquatic animal, has not yet been investigated. In the present study, redclaw crayfish (Cherax quadricarinatus) were exposed to different concentrations of 200 nm-sized polystyrene microspheres (0, 0.5, and 5 mg/L) for 21 days, to investigate the effects of microplastics on lipid metabolism. After ingestion, the microplastics were distributed in the intestines and hepatopancreas, and appeared to inhibit the growth of Cherax quadricarinatus. Subsequently, the lipid levels in the hepatopancreas and hemolymph was detected, and found that after 21 days of exposure, the lipid content and free fatty acids in the hepatopancreas and hemolymph decreased significantly, and total cholesterol and triglycerides levels increased significantly in the hemolymph. This might have been caused by insufficient intake of exogenous fat. A significant decrease in lipase activity also supported this view. The activity of lipoprotein lipase related to lipolysis in the hepatopancreas increased significantly, while the activity of fatty acid synthase related to fat synthesis increased, and the activity of acetyl-CoA carboxylase decreased. These results indicated disturbed lipid metabolism in the hepatopancreas. The significant increase of lipid transport-related low-density lipoprotein indicated that the lipolytic capacity was higher than the lipid synthesis capacity. The expression levels of fatty acid metabolism-related genes FAD6 and FABP decreased significantly, indicating that the fatty acid utilization ability of hepatopancreas cells was inhibited, which was consistent with the results of enzyme activities. Thus, microplastics represent a potential hazard to redclaw crayfish, at least on lipid metabolism. This study provided basic data on the ecotoxicological effects of microplastics on crustaceans.

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