Abstract
Paraquat (PQ) administration consists in a chemical model that mimics phenotypes observed in Parkinson’s disease (PD), due to its ability to induce changes in dopaminergic system and oxidative stress. The aim of this study was to evaluate the actions of PQ in behavioral functions of adult zebrafish and its influence on oxidative stress biomarkers in brain samples. PQ (20 mg/kg) was administered intraperitoneally with six injections for 16 days (one injection every 3 days). PQ-treated group showed a significant decrease in the time spent in the bottom section and a shorter latency to enter the top area in the novel tank test. Moreover, PQ-exposed fish showed a significant decrease in the number and duration of risk assessment episodes in the light–dark test, as well as an increase in the agonistic behavior in the mirror-induced aggression (MIA) test. PQ induced brain damage by decreasing mitochondrial viability. Concerning the antioxidant defense system, PQ increased catalase (CAT) and glutathione peroxidase (GPx) activities, as well as the non-protein sulfhydryl content (NPSH), but did not change ROS formation and decreased lipid peroxidation. We demonstrate, for the first time, that PQ induces an increase in aggressive behavior, alters non-motor patterns associated to defensive behaviors, and changes redox parameters in zebrafish brain. Overall, our findings may serve as useful tools to investigate the interaction between behavioral and neurochemical impairments triggered by PQ administration in zebrafish.
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Acknowledgments
We would like to thank the Federal University of Santa Maria for the support and facilities and the financial support and fellowships from the Brazilian agency CAPES (Coordination for the Improvement of Higher Education Personnel). V.L.L. and D.B.R. are recipients of CNPq (National Counsel of Technological and Scientific Development) research productivity grant (312983/2013-1, 307595/2015-3, respectively).
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Nunes, M.E., Müller, T.E., Braga, M.M. et al. Chronic Treatment with Paraquat Induces Brain Injury, Changes in Antioxidant Defenses System, and Modulates Behavioral Functions in Zebrafish. Mol Neurobiol 54, 3925–3934 (2017). https://doi.org/10.1007/s12035-016-9919-x
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DOI: https://doi.org/10.1007/s12035-016-9919-x