Increased recovery of brain acetylcholinesterase activity in dichlorvos-intoxicated European eels Anguilla anguilla by bath treatment withN-acetylcysteine

Diseases of Aquatic Organisms

Juan B. Peña¹  Dolores Ferrando¹  Samuel Peña-Llopis¹ 

关键词: Detoxification;    Organophosphorus pesticide;    Organophosphate poisoning;    Cholinesterase inhibitor;    Oxidative stress;    N-acetyl-l-cysteine;    AChE;    Glutathione metabolism;   

DOI  :  10.3354/dao055237

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Organophosphate (OP) pesticides are widely used as antiparasitic chemicals in finfish aquaculture. However, current antidotes cannot be applied to treat intoxicated fish. We showed in previous studies the importance of glutathione (GSH)metabolism in pesticide resistance of the European eel Anguilla anguilla L. The present work studied the effects of the antioxidant and glutathione pro-drug N-acetyl-l-cysteine (NAC) on the recovery of European eels exposed for 96 h to asublethal concentration (0.17 mg l^-1; 20% of its 96 h LC₅₀) of the OP pesticide dichlorvos (2,2-dichlorovinyl dimethyl phosphate; DDVP). This insecticide and acaricide decreased muscular GSH content and increased oxidisedglutathione (GSSG), lowering the GSH:GSSG ratio, which is indicative of a condition of oxidative stress. Acetylcholinesterase (AChE) and glutathione reductase (GR) activities in the brain, which were biomarkers of neurotoxicity and oxidative stress,respectively, were also highly inhibited. Recovery in a 0.5 mM (81.6 mg l^-1) NAC concentration ameliorated muscular GSH depletion, GSH:GSSG ratio, and the inhibition of brain AChE and GR activities. Hence, this is the first evidence of improvedrecovery of organophosphate-poisoned fish by bath treatments.

【 授权许可】

Unknown