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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Both ionizing radiation (IR) and psychological stresses (PS) cause detrimental effects on humans. There is a great concern to understand if PS could cause any alterations in the response of human beings to IR. A pioneering study showed chronic restraint-induced PS (CRIPS) increased gamma-radiation-induced carcinogenesis in Trp53+/- mice. Prior to carcinogenesis study, to investigate the effects from PS on IR-induced health consequences, effects of Fe total body irradiation (Fe TBI) on the hematopoietic system in Trp53+/- mice under CRIPS were studied. Six-week-old male C57BL/6N mice were chronically restrained 6 hours daily for consecutive 28 days, being given Fe TBI (0.1 Gy or 2.0 Gy) on the 8th day. The peripheral blood and the bone marrow were collected for analysis of hematological abnormality and residual damage in the erythrocytes. Results showed that CRIPS alone hardly induce marked alteration in hematological parameters in the peripheral blood and the formation of micronucleated erythrocytes in the bone marrow while Fe TBI alone could induce significant hematological alteration and increased micronucleated erythrocytes. On the other hand, concurrent exposure of the animals to CRIPS and Fe TBI always showed a tendency of increased micronucleated erythrocytes when compared to the animals receiving only Fe TBI, and the increase was statistically significant for the mice receiving Fe TBI at 0.1 Gy.
Effects from Chronic Restraint-Induced Stress and Total Body Fe Irradiation on the Hematopoietic System in Trp53-Heterozygous Mice
