Adaptive response in zebrafish embryos induced using microbeam protons as priming dose and and X-ray photons as challenging dose

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  • CHOI Viann Wing Yan
    Department of Physics and Materials Science, City University of Hong Kong
  • KONISHI Teruaki
    Department of Technical Support and Development, National Institute of Radiological Sciences
  • OIKAWA Masakazu
    Department of Technical Support and Development, National Institute of Radiological Sciences
  • ISO Hiroyuki
    Department of Technical Support and Development, National Institute of Radiological Sciences
  • CHENG Shuk Han
    Department of Biology and Chemistry, City University of Hong Kong
  • YU Kwan Ngok
    Department of Physics and Materials Science, City University of Hong Kong

書誌事項

タイトル別名
  • Adaptive Response in Zebrafish Embryos Induced Using Microbeam Protons as Priming Dose and X-ray Photons as Challenging Dose
公開日
2010
資源種別
journal article
DOI
  • 10.1269/jrr.10054
公開者
Journal of Radiation Research 編集委員会

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説明

In the studies reported here, a high-linear-energy-transfer (high-LET)-radiation dose was used to induce adaptive response in zebrafish embryos in vivo. Microbeam protons were used to provide the priming dose and X-ray photons were employed to provide the challenging dose. The microbeam irradiation system (Single-Particle Irradiation System to Cell, acronym as SPICE) at the National Institute of Radiological Sciences (NIRS), Japan, was employed to control and accurately quantify the number of protons at very low doses, viz., about 100 μGy. The embryos were dechorionated at 4 h post fertilization (hpf) and irradiated at 5 hpf by microbeam protons. For each embryo, ten irradiation points were arbitrarily chosen without overlapping with one another. To each irradiation point, 5, 10 or 20 protons each with an energy of 3.4 MeV were delivered. The embryos were returned back to the incubator until 10 hpf to further receive the challenging exposure, which was achieved using 2 Gy of X-ray irradiation, and then again returned to the incubator until 24 hpf for analyses. The levels of apoptosis in zebrafish embryos at 25 hpf were quantified through terminal dUTP transferase-mediated nick end-labeling (TUNEL) assay, with the apoptotic signals captured by a confocal microscope. The results revealed that 5 to 20 protons delivered at 10 points each on the embryos, or equivalently 110 to 430 μGy, could induce radioadaptive response in the zebrafish embryos in vivo.

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