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- W2004367631 abstract "Nano-scale zinc oxide (nano-ZnO) is widely used in various industrial and commercial applications. However, the available toxicological information was inadequate to assess the potential ecological risk of nano-ZnO to aquatic organisms and the publics. In this study, the developmental toxicity, oxidative stress and DNA damage of nano-ZnO embryos were investigated in the embryo-larval zebrafish, the toxicity of Zn(2+) releasing from nano-ZnO were also investigated to ascertain the relationship between the nano-ZnO and corresponding Zn(2+). Zebrafish embryos were exposed to 1, 5, 10, 20, 50, and 100mg/L nano-ZnO and 0.59, 2.15, 3.63, 4.07, 5.31, and 6.04 mg/L Zn(2+) for 144 h post-fertilisation (hpf), respectively. Up to 144 hpf, activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx), and malondialdehyde (MDA) contents, the genes related to oxidative damage, reactive oxygen species (ROS) generation and DNA damage in zebrafish embryos were measured. The nano-ZnO was found to exert a dose-dependent toxicity to zebrafish embryos and larvae, reducing the hatching rate and inducing malformation and the acute toxicity to zebrafish embryos was greater than that of the Zn(2+) solution. The generation of ROS was significantly increased at 50 and 100mg/L nano-ZnO. DNA damage of zebrafish embryo was evaluated by single-cell gel electrophoresis and was enhanced with increasing nano-ZnO concentration. Moreover, the transcriptional expression of mitochondrial inner membrane genes related to ROS production, such as Bcl-2, in response to oxidative damage, such as Nqo1, and related to antioxidant response element such as Gstp2 were significantly down-regulated in the nano-ZnO treatment groups. However, the nano-ZnO up-regulated the transcriptional expression of Ucp2-related to ROS production. In conclusion, nano-ZnO induces developmental toxicity, oxidative stress and DNA damage on zebrafish embryos and the dissolved Zn(2+) only partially contributed to the toxicity of nano-ZnO. The adverse effects of nano-ZnO may be the important mechanisms of its toxicity to zebrafish embryos." @default.
- W2004367631 created "2016-06-24" @default.
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- W2004367631 date "2013-07-01" @default.
- W2004367631 modified "2023-10-14" @default.
- W2004367631 title "Acute ZnO nanoparticles exposure induces developmental toxicity, oxidative stress and DNA damage in embryo-larval zebrafish" @default.
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- W2004367631 doi "https://doi.org/10.1016/j.aquatox.2013.03.019" @default.
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