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• W2051277983 abstract "Purpose Zebrafish (Danio rerio) embryos provide a unique vertebrate model to screen therapeutic agents easily and rapidly because of their relatively close genetic relationship to humans, ready abundance and accessibility, short embryonal development, and optical clarity. To validate zebrafish embryos as a screen for radiation modifiers, we evaluated the effects of ionizing radiation in combination with a known radioprotector (free radical scavenger Amifostine) or radiosensitizing agent (tyrosine kinase inhibitor AG1478). Methods and materials Viable zebrafish embryos were exposed to 0–10 Gy single-fraction 250 kVp X-rays with or without either Amifostine (0–4 mM) or AG1478 (0–10 μM) at defined developmental stages from 1–24 h postfertilization (hpf). Embryos were examined for morphologic abnormalities and viability until 144 hpf. Results Radiation alone produced a time- and dose-dependent perturbation of normal embryonic development and survival with maximal sensitivity at doses ≥4 Gy delivered before 4 hpf. Amifostine markedly attenuated this effect, whereas AG1478 enhanced teratogenicity and lethality, particularly at therapeutically relevant (2–6 Gy) radiation doses. Conclusions Collectively, these data validate the use of zebrafish as a vertebrate model to assess the effect of radiation alone or with radiation response modulators. Zebrafish embryos may thus provide a rapid, facile system to screen novel agents ultimately intended for human use in the context of therapeutic or accidental radiation exposure. Zebrafish (Danio rerio) embryos provide a unique vertebrate model to screen therapeutic agents easily and rapidly because of their relatively close genetic relationship to humans, ready abundance and accessibility, short embryonal development, and optical clarity. To validate zebrafish embryos as a screen for radiation modifiers, we evaluated the effects of ionizing radiation in combination with a known radioprotector (free radical scavenger Amifostine) or radiosensitizing agent (tyrosine kinase inhibitor AG1478). Viable zebrafish embryos were exposed to 0–10 Gy single-fraction 250 kVp X-rays with or without either Amifostine (0–4 mM) or AG1478 (0–10 μM) at defined developmental stages from 1–24 h postfertilization (hpf). Embryos were examined for morphologic abnormalities and viability until 144 hpf. Radiation alone produced a time- and dose-dependent perturbation of normal embryonic development and survival with maximal sensitivity at doses ≥4 Gy delivered before 4 hpf. Amifostine markedly attenuated this effect, whereas AG1478 enhanced teratogenicity and lethality, particularly at therapeutically relevant (2–6 Gy) radiation doses. Collectively, these data validate the use of zebrafish as a vertebrate model to assess the effect of radiation alone or with radiation response modulators. Zebrafish embryos may thus provide a rapid, facile system to screen novel agents ultimately intended for human use in the context of therapeutic or accidental radiation exposure." @default.
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• W2051277983 date "2005-01-01" @default.
• W2051277983 modified "2023-10-09" @default.
• W2051277983 title "Novel use of zebrafish as a vertebrate model to screen radiation protectors and sensitizers" @default.
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• W2051277983 doi "https://doi.org/10.1016/j.ijrobp.2004.09.046" @default.
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