Abstract
The cyanobacterial toxin cylindrospermopsin (CYN) is a widely distributed contaminant of freshwater systems with the consequent risk for human and wildlife, particularly fish. However, CYN toxicity data on fish are still scarce. It is known that CYN inhibits glutathione synthesis and this could contribute to oxidative damage. In the present work tilapia (Oreochromis niloticus) were exposed by gavage to 200 and 400 μg/kg bw of pure CYN and sacrificed after 24 h. The activity and relative mRNA expression by real-time PCR of antioxidant enzymes glutathione peroxidase (GPx) and soluble glutathione-S-transferases (sGST) and the sGST protein abundance by Western blot analysis were evaluated in liver and kidney. Also the induction of lipid peroxidation (LPO) was assayed. Results show an increase of LPO products in both organs. Moreover, CYN altered the activity, gene expression and protein abundance of the enzymes, indicating the importance of GPx and sGST in CYN pathogenicity. This is the first time that CYN is reported to affect these enzymes in fish and they have shown to be responsive biomarkers of CYN toxicity.
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Acknowledgments
The authors wish to thank the Spanish CICYT (AGL2009-10026ALI) and Junta de Andalucía (P09-AGR-04672I) for the financial support for this study, and the Biology Service of Centro de Investigación, Tecnología e Innovación de la Universidad de Sevilla (CITIUS) and Dr. Vitorica research group for providing technical assistance.
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Puerto, M., Jos, A., Pichardo, S. et al. Acute effects of pure cylindrospermopsin on the activity and transcription of antioxidant enzymes in tilapia (Oreochromis niloticus) exposed by gavage. Ecotoxicology 20, 1852–1860 (2011). https://doi.org/10.1007/s10646-011-0723-0
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DOI: https://doi.org/10.1007/s10646-011-0723-0