Abstract
Iron oxide nanoparticles (IONPS) have been widely investigated as a platform for a new class of multifunctional theranostic agents. They are considered biocompatible, and some formulations are already available in the market for clinical use. However, contradictory results regarding toxicity of IONPs raise a concern about the potential harm of these nanoparticles. Changes in the nanoparticle (NP) physicochemical properties or exposure media can significantly alter their behavior and, as a consequence, their toxic effects. Here, behavior and two-step RT-qPCR were employed to access the potential toxicological effects of dextran-coated IONPs (CLIO-NH2) and uncoated IONPs (UCIO) in zebrafish larvae. Animals were exposed for 7 days to NP solutions ranging from 0.1–100 μg/mL directly mixed to the system water. UCIO showed high decantation and instability in solution, altering zebrafish mortality but showing no alterations in behavior and molecular expression analysis. CLIO-NH2 exposure did not cause significant mortality or changes in hatching rate of zebrafish larvae; however, behavior and expression profiles of the group exposed to lower concentration (1 μg/mL) presented a tendency to decrease the locomotor activity and apoptotic pathway activation.
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Acknowledgements
This research was supported by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), FINEP (Financiadora de Estudos e Projetos) Research Grant “Implantação, Modernização e Qualificação de Estrutura de Pesquisa da PUCRS” (PUCRSINFRA) #01.11.0014-00 and INCT—Brain Disease Excitotoxicity and Neuroprotection. G.M.T.O and E.M.N.O are recipients of fellowship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). T.C.B.P is recipient from CAPES/PNPD Program. R.M.P. and M.R.B are Research Career Awardees from CNPq.
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Supplementary Fig. 1
Stability over 7 days. Size distribution for (a) CLIO-NH2 and (b) UCIO. Symbols are as follows: (●) Day 1, (□) Day 2, (◊) Day 3, (x) Day 4, (+) Day 5, (▵) Day 6, (◣) Day 7. DLS measurements of hydrodynamic size (c) and Zeta potential (d) of the CLIO-NH2 (blue lines) and UCIO (black lines) solutions measured during 7 days (GIF 434 kb)
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de Oliveira, G.M.T., de Oliveira, E.M.N., Pereira, T.C.B. et al. Implications of exposure to dextran-coated and uncoated iron oxide nanoparticles to developmental toxicity in zebrafish. J Nanopart Res 19, 389 (2017). https://doi.org/10.1007/s11051-017-4074-5
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DOI: https://doi.org/10.1007/s11051-017-4074-5