Low-dose ionising radiation effects: effects of thoron inhalation

Q4 Medicine
A. Menon, R. Indu, Tiju Chacko, C. Nair
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引用次数: 4

Abstract

Cellular DNA damage, tissue antioxidant levels, serum parameters, blood count and histopathological alterations were examined in tissues of mice exposed to thoron (average radiation dose0.065 μSv/hr). Alkaline cometassay results indicated that inhalation of thoron caused significant increase in the damage to DNA of lung tissue, while there was no significant damage to DNA in bone marrow cells. A small increase in cellular DNA damage was also seen in blood leukocytesfollowing thoron exposure. Inhalation of thoron induced severe damage in the lung cells leading to their elimination by apoptosis. Histology of lungs showed areas of abnormalities. An increase in the level of inflammatory response mediator, NF-κB, was also observed in the lung tissue of exposed mice. The DNA damage in lung cells could be induced by high energy radiation emanating from radioactive decay of thoron and its progeny particularly the alpha radiation of 8.88 MeV from 212Po.
低剂量电离辐射效应:吸入钍的效应
在平均辐射剂量为0.065 μSv/hr的辐照下,检测小鼠组织中细胞DNA损伤、组织抗氧化水平、血清参数、血细胞计数和组织病理学改变。碱性cometassay结果显示,吸入钍引起肺组织DNA损伤明显增加,而对骨髓细胞DNA无明显损伤。暴露于钍后,血液白细胞中细胞DNA损伤也有小幅增加。吸入刺激素对肺细胞造成严重损伤,导致细胞凋亡。肺组织学显示异常区。暴露小鼠肺组织中炎症反应介质NF-κB水平升高。钍及其子代放射性衰变产生的高能辐射可引起肺细胞DNA损伤,尤其是212Po产生的8.88 MeV的α辐射。
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来源期刊
International Journal of Low Radiation
International Journal of Low Radiation Environmental Science-Health, Toxicology and Mutagenesis
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期刊介绍: The IJLR is a peer-reviewed journal dedicated to the publication of research articles, review papers and technical notes in all domains related to low-dose radiation, among which are the biological and health effects in humans and the biota, in vitro and in vivo research on low radiation effects, regulatory and policy aspects, risk estimation and public perception.
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