Metabolomics Analysis of the Potential Toxicological Mechanisms of Diquat Dibromide Herbicide in Adult Zebrafish (Danio Rerio) Liver

Overview

Journal Fish Physiol Biochem

Specialty Biochemistry

Date 2022 Jul 13

PMID 35831485

Authors

Ye Xiao

Xiang Lin

Meilan Zhou

Tianyu Ren

Ruili Gao

Zhongqun Liu

Wenjing Shen

Rong Wang

Xi Xie

Yanting Song

Wenting Hu

Affiliations

Soon will be listed here.

Abstract

Although diquat is a widely used water-soluble herbicide in the world, its sublethal adverse effects to fish have not been well characterised. In this study, histopathological examination and biochemical assays were applied to assess hepatotoxicity and combined with gas chromatography-mass spectrometry (GC-MS)-based metabolomics analysis to reveal overall metabolic mechanisms in the liver of zebrafish (Danio rerio) after diquat exposure at concentrations of 0.34 and 1.69 mg·L for 21 days. Results indicated that 1.69 mg·L diquat exposure caused cellular vacuolisation and degeneration with nuclear abnormality and led to the disturbance of antioxidative system and dysfunction in the liver. No evident pathological injury was detected, and changes in liver biochemistry were not obvious in the fish exposed to 0.34 mg·L diquat. Multivariate statistical analysis revealed differences between profiles obtained by GC-MS spectrometry from control and two treatment groups. A total of 17 and 22 metabolites belonging to different classes were identified following exposure to 0.34 and 1.69 mg·L diquat, respectively. The metabolic changes in the liver of zebrafish are mainly manifested as inhibition of energy metabolism, disorders of amino acid metabolism and reduction of antioxidant capacity caused by 1.69 mg·L diquat exposure. The energy metabolism of zebrafish exposed to 0.34 mg·L diquat was more inclined to rely on anaerobic glycolysis than that of normal zebrafish, and interference effects on lipid metabolism were observed. The metabolomics approach provided an innovative perspective to explore possible hepatic damages on fish induced by diquat as a basis for further research.

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