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Reactive oxygen species and other biochemical and morphological biomarkers in the gills and kidneys of the Neotropical freshwater fish, Prochilodus lineatus, exposed to titanium dioxide (TiO2) nanoparticles

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Abstract

This study investigated the action of titanium dioxide nanoparticles (TiO2-NPs), on the gills and kidneys of Neotropical freshwater fish, Prochilodus lineatus, with emphasis on reactive oxygen species (ROS) production, antioxidant responses, and morphological changes. Fish were exposed to 1, 5, 10, and 50 mg L−1 nominal TiO2-NPs suspended into water for 2 or 14 days. In gills, ROS decreased and glutathione (GSH) increased after 2 days, while ROS and GSH increased and superoxide dismutase activity decreased after 14 days. In kidneys, GSH and lipoperoxidation increased after 2 days and catalase activity decreased after 14 days. Common histopathologies in gills were epithelium hyperplasia, cellular hypertrophy, proliferation of mitochondria-rich cells (MRC), and lamellar stasis; in kidneys, there were cellular and nuclear hypertrophy, focal tubule degeneration, necrosis, and melanomacrophage (MM) proliferation. Although environmentally unlikely, high-dose exposures clarified biological effects of TiO2-NPs, such as ROS formation and MRC responses in the gills, which may impair ionic balance. It was also found that MM are likely responsible for eliminating NPs in the kidney. These findings will help to regulate TiO2-NP disposal, but longer-term studies are still needed.

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Acknowledgements

The authors are thankful to Hydrology and Fish Farming Station from Hydroelectric Plant of Furnas (FURNAS), Brazil, for donation of fish; J. G. Baldon, E.M. Marques, W. E. Risso, and M.C. Vaz for technical helping; and Dr. W. Zucolotto for facilities in the physical measurements of TiO2-NP. T.L.L. Carmo acknowledges São Paulo Research Foundation (FAPESP, Proc. 2011/10339-0) for scholarship.

Funding

This study was supported by the São Paulo Research Foundation (FAPESP, Grant No. 2014/05701-0) and National Council of Scientific and Technological Development (CNPq, 472875/2011-6) and National Council of Scientific and Technological Development/National Institute of Science and Technology-Aquatic Toxicology (CNPq/INCT) (Grant No. 573949/2008-5).

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Correspondence to Marisa Narciso Fernandes.

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The authors declare that they have no conflict of interest.

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Responsible editor: Philippe Garrigues

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do Carmo, T.L.L., Azevedo, V.C., de Siqueira, P.R. et al. Reactive oxygen species and other biochemical and morphological biomarkers in the gills and kidneys of the Neotropical freshwater fish, Prochilodus lineatus, exposed to titanium dioxide (TiO2) nanoparticles. Environ Sci Pollut Res 25, 22963–22976 (2018). https://doi.org/10.1007/s11356-018-2393-4

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  • DOI: https://doi.org/10.1007/s11356-018-2393-4

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