Article
Effects of Depuration on HistopathologicalChanges in Tilapia (Oreochromis Niloticus) AfterExposure to Cylindrospermopsin
Author/s | Guzmán Guillén, Remedios
Prieto Ortega, Ana Isabel Moreno Navarro, Isabel María Ríos Camacho, María Victoria Moyano, Rosario Blanco, Alfonso Vasconcelos, Vitor Cameán Fernández, Ana María |
Department | Universidad de Sevilla. Departamento de Nutrición y Bromatología, Toxicología y Medicina Legal |
Publication Date | 2017 |
Deposit Date | 2021-12-09 |
Published in |
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Abstract | Cylindrospermopsin (CYN) is a highly water-soluble cytotoxin produced by several species of freshwater cyanobacteria and it is considered the second most studied cyanotoxin worldwide. CYN acts as a potent protein and ... Cylindrospermopsin (CYN) is a highly water-soluble cytotoxin produced by several species of freshwater cyanobacteria and it is considered the second most studied cyanotoxin worldwide. CYN acts as a potent protein and glutathione synthesis inhibitor, as well as inducing genotoxicity, oxidative stress and histopathological alterations. Studies concerning the depuration of cyanobacterial toxins in aquatic organisms, especially in fish, are of great interest for fish economy and public health, but are scarce in the case of CYN. This is the first study reporting the ability of depuration (3 − 7 days) in reversing or ameliorating the histopathological lesions induced in liver, kidney, heart, intestines, and gills of tilapia (Oreochromis niloticus) due to exposure by immersion to repeated doses of a CYN-containing culture of A. ovalisporum for 14 days. The main histopathological changes induced by CYN were glucogenic degeneration and loss of the normal hepatic cord-structure (liver), hyperemia, dilated Bowman's capsule and cellular tumefaction (kidney), myofibrolysis, hemorrhages and edema (heart), necrosis and partial loss of microvilli (gastrointestinal tract), and hyperemia and inflammatory cells infiltrates (gills). After 3 days of depuration, gills were totally recovered, while the liver, kidney, and gastrointestinal tract required 7 days, and longer depuration periods may be needed for a full recovery of the heart. In addition, the morphometric study indicated that depuration managed to reverse the affectation in the hepatocytes nuclear diameters and cross sections of the proximal and distal convoluted tubules induced in CYN-exposed fish. In general, these results validate depuration as an effective practice for detoxification of fish contaminated with CYN. |
Funding agencies | Ministerio de Ciencia e Innovación (MICIN). España Junta de Andalucía |
Project ID. | AGL2009-10026
AGL2015-64558-R P09-AGR-4672 |
Citation | Guzmán Guillén, R., Prieto Ortega, A.I., Moreno Navarro, I.M., Ríos Camacho, M.V., Moyano, R., Blanco, A.,...,Cameán Fernández, A.M. (2017). Effects of Depuration on HistopathologicalChanges in Tilapia (Oreochromis Niloticus) AfterExposure to Cylindrospermopsin. Environmental Toxicology, 32 (4), 1318-1332. |
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10.1002_tox.22326.pdf | 1.524Mb | [PDF] | View/ | Postprint |