Abstract
This study aimed to evaluate the biological effects of gamma irradiation on zebrafish embryos. Different doses of gamma rays (0.01, 0.05, 0.1, 0.5 and 1 Gy) were used to irradiate zebrafish embryos at three developmental stages (stage 1, 6 h post-fertilization (hpf); stage 2, 12 hpf; stage three, 24 hpf), respectively. The survival, malformation and hatching rates of the zebrafish embryos were measured at the morphological endpoint of 96 hpf. The activities of superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), glutathione peroxidase (GPx) and glutathione S-transferase (GST) were assayed. Morphology analysis showed that gamma irradiation inhibited hatching and induced developmental toxicity in a dose-dependent manner. Interestingly, after irradiation the malformation rate changed not only in a dose-dependent manner but also in a developmental stage-dependent manner, indicating that the zebrafish embryos at stage 1 were more sensitive to gamma rays than those at other stages. Biochemical analysis showed that gamma irradiation modulated the activities of antioxidant enzymes in a dose-dependent manner. A linear relationship was found between GPx activity and irradiation dose in 0.1–1 Gy group, and GPx was a suitable biomarker for gamma irradiation in the dose range from 0.1 to 1 Gy. Furthermore, the activities of SOD, CAT, GR and GPx of the zebrafish embryos at stage 3 were found to be much higher than those at other stages, indicating that the zebrafish embryos at stage 3 had a greater ability to protect against gamma rays than those at other stages, and thus the activities of antioxidant enzymes changed in a developmental stage-dependent manner.
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Abbreviations
- BCA:
-
Bicinchoninic acid
- hpf:
-
Hours post-fertilization
- XOD:
-
Xanthine oxidase
- SOD:
-
Superoxide dismutase
- GSSG:
-
L-Glutathione oxidized
- CAT:
-
Catalase
- GSH:
-
Reduced glutathione
- GR:
-
Glutathione reductase
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- GPx:
-
Glutathione peroxidase
- DTNB:
-
5,5′-Dithiobis-2-nitrobenzoic acid
- GST:
-
Glutathione S-transferase
- CDNB:
-
1-Chloro-2,4-dinitrobenzene
- ROS:
-
Reactive oxygen species
- LPO:
-
Lipid hydroperoxide
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Acknowledgments
This work was supported by the Defense Industrial Technology Development Program (No. B3720132001) and the National Natural Science Foundation of China (No. U1401231).
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All applicable international, national and institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of Institutional Animal Care and Use Committees (IACUC) of University of South China, Hengyang, China.
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Miao Hu and Nan Hu contributed equally to this work.
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Hu, M., Hu, N., Ding, D. et al. Developmental toxicity and oxidative stress induced by gamma irradiation in zebrafish embryos. Radiat Environ Biophys 55, 441–450 (2016). https://doi.org/10.1007/s00411-016-0663-4
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DOI: https://doi.org/10.1007/s00411-016-0663-4