doi:10.1016/j.asr.2006.11.011

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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。
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Permalink : http://id.nii.ac.jp/1657/00044870/

Effects of Prenatal Irradiation with an Accelerated Heavy-Iron Beam on Postnatal Development in Rats: II.. Further Study on Neurophysiologic Alterations 利用統計を見る

アイテムタイプ	学術雑誌論文 / Journal Article
言語	英語
著者	Bing Wang Murakami Masahiro Eguchi-Kasai Kiyomi Nojima Kumie Shang Yi Tanaka Kaoru Watanabe Keiko Fujita Kazuko Moreno Stephanie.G Herve Coffigny Hayata Isamu
抄録	Organogenesis is a highly radiosensitive period, study of prenatal exposure to high LET heavy ion beams on postnatal development is important for clarifying the radiation risk in space and promoting the evidence-based mechanism research. The effects from heavy ion irradiations are not well studied as those for low LET radiations such as X-rays in this field, even the ground-based investigations remain to be addressed. Using the Heavy Ion Medical Accelerator in Chiba (HIMAC) and Wistar rats, postnatal neurophysiological development in offspring was investigated following exposure of pregnant rats to accelerated neon-ion beams with a LET value of about 30 keV/um at a dose range from 0.1 to 2.0Gy on the 15th day of gestation. The age for appearance of four physiologic markers and attainment of five neonatal reflexes, and gain in body weight were monitored. Male offspring were evaluated as young adults using two behavioral tests including open field and hole-board dipping tests. The effects of X-rays at 200 kVp measured for the same biological end points were studied for comparison. For most of the endpoints at early age, significant neurophysiological alteration was observed even in offspring receiving 0.1 Gy of accelerated neon ions but not X-rays. All offspring receiving 2.0 Gy of accelerated neon ions died prior to weaning. Offspring prenatally irradiated with neon ions generally showed higher incidences of prenatal death, increased preweaning mortality, markedly delayed accomplishment in physiological markers and reflexes, significantly lower body weight and reduced ratios of main organ weight to body weight, and altered behavior compared to those exposed to X-rays at doses of 0.1 to 1.5 Gy. These findings indicate that irradiations with neon ions at 0.1 to 1.5 Gy on day 15 of gestation caused varied developmental alterations in offspring, and efficient dose leading to the detrimental effects seemed to be lower than that of X-rays.
雑誌名	Advances in Space Research
巻	39
号	6
ページ	994 - 1003
発行年	2007-01
ISSN	0273-1177
DOI	10.1016/j.asr.2006.11.011
著者版フラグ	none