Non-induction of radioadaptive response in zebrafish embryos by neutrons
| Autor: | C. Y. P. Ng, Alisa Kobayashi, K.N. Yu, Shuk Han Cheng, Noriyoshi Suya, Eva Yi Kong, Yukio Uchihori, Teruaki Konishi |
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| Rok vydání: | 2016 |
| Předmět: |
NASBEE
Embryo Nonmammalian animal structures radioadaptive response Health Toxicology and Mutagenesis Danio Priming (immunology) Apoptosis Biology 030218 nuclear medicine & medical imaging Andrology 03 medical and health sciences 0302 clinical medicine hormesis In vivo Regular Paper Animals Radiology Nuclear Medicine and imaging Neutron Zebrafish Neutrons Radiation business.industry technology industry and agriculture Hormesis Embryo Alpha Particles biology.organism_classification 030220 oncology & carcinogenesis embryonic structures zebrafish embryos Nuclear medicine business |
| Zdroj: | Journal of Radiation Research |
| ISSN: | 1349-9157 0449-3060 |
| DOI: | 10.1093/jrr/rrv089 |
| Popis: | In vivo neutron-induced radioadaptive response (RAR) was studied using zebrafish ( Danio rerio ) embryos. The Neutron exposure Accelerator System for Biological Effect Experiments (NASBEE) facility at the National Institute of Radiological Sciences (NIRS), Japan, was employed to provide 2-MeV neutrons. Neutron doses of 0.6, 1, 25, 50 and 100 mGy were chosen as priming doses. An X-ray dose of 2 Gy was chosen as the challenging dose. Zebrafish embryos were dechorionated at 4 h post fertilization (hpf), irradiated with a chosen neutron dose at 5 hpf and the X-ray dose at 10 hpf. The responses of embryos were assessed at 25 hpf through the number of apoptotic signals. None of the neutron doses studied could induce RAR. Non-induction of RAR in embryos having received 0.6- and 1-mGy neutron doses was attributed to neutron-induced hormesis, which maintained the number of damaged cells at below the threshold for RAR induction. On the other hand, non-induction of RAR in embryos having received 25-, 50- and 100-mGy neutron doses was explained by gamma-ray hormesis, which mitigated neutron-induced damages through triggering high-fidelity DNA repair and removal of aberrant cells through apoptosis. Separate experimental results were obtained to verify that high-energy photons could disable RAR. Specifically, 5- or 10-mGy X-rays disabled the RAR induced by a priming dose of 0.88 mGy of alpha particles delivered to 5-hpf zebrafish embryos against a challenging dose of 2 Gy of X-rays delivered to the embryos at 10 hpf. |
| Databáze: | OpenAIRE |
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