量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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Induction of adaptive response (AR) by the high LET accelerated heavy ion irradiations (HI) is being attempted both in young adult female mice and in fetal mice of C57BL/6J strain, using mainly thirty-day survival in vivo and prenatal death & malformation in utero as endpoints. In fiscal year 2011, using carbon, silicon, neon, and iron HI and X-rays, we demonstrated that 1) in the in utero studies, the priming low dose neon-ion irradiations could not induce any protective effects against the detrimental effects from the challenging irradiations from X-rays; 2) in the in vivo studies, no AR was observable in the following combinations for the priming and challenging irradiations: silicon plus carbon, iron plus carbon, and iron plus silicon. Thus we have finished all the radiation combinations in the in utero studies. The findings in the in utero studies indicate that induction of AR by X-rays against high LET HI is an event depending on the LET or/and species of the ions, and it seems hardly to induce AR by high LET HI against X-rays. For the in vivo studies, most radiation combinations are finished or under investigation, and we expect to complete the remaining combination in the fiscal year 2012.
雑誌名
Annual Report of the Research Project with Heavy Ions at NIRS-HIMAC
Does Radioadaptive Response Also Apply to the Case of Heavy-ion Irradiations in Fetal and Adult Mice?
