Biotransformation of dietary inorganic arsenic in a freshwater fish Carassius auratus and the unique association between arsenic dimethylation and oxidative damage

JOURNAL OF HAZARDOUS MATERIALS

卷:391

Article

Cui, Di¹  Zhang, Peng²  Li, Haipu^1,3  Zhang, Zhaoxue¹  Luo, Wenbao¹  Yang, Zhaoguang^1,3 

[1] Cent South Univ, Coll Chem & Chem Engn, Ctr Environm & Water Resources, Changsha 410083, Peoples R China

[2] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England

[3] Cent South Univ, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Peoples R China

关键词: Arsenic;    Bioaccumulation;    Biotransformation;    Oxidative stress;    Freshwater fish;   

DOI  :  10.1016/j.jhazmat.2020.122153

来源: Elsevier

【 摘 要 】

The metabolic process and toxicity mechanism of dietary inorganic arsenic (iAs) in freshwater fish remain unclear to date. The present study conducted two iAs [arsenate (As(V)) and arsenite (As(III))] dietary exposures in freshwater fish crucian carp (Carassius auratus). The fish were fed on As supplemented artificial diets at nominal concentrations of 50 and 100 mu g As(III) or As(V) g(-1) (dry weight) for 10 d and 20 d. We found that the liver, kidney, spleen, and intestine of fish accumulated more As in As(V) feeding group than that in As(III), while the total As levels in muscle were similar between As(V) and As(III) group at the end of exposure. Reduction of As(V) to As(III) and oxidation of As(III) to As(V) occurred in fish fed with As(V) and As(III), respectively, indicating that toxicity of iAs was likely elevated or reduced when iAs was absorbed by fish before entering into human body through diet. Biomethylation to monomethylarsonic acid and dimethylarsinic acid and transformation to arsenocholine and arsenobetaine were also found in the fish. The linear regression analysis showed a positive correlation between secondary methylation index and the malondialdehyde content in tissues, highlighting the vital role of arsenic dimethylation in the oxidative damages in fish.

【 授权许可】

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