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Biodosimetry of persons chronically exposed to low and therapeutic doses of ionizing radiation

机译:长期暴露于低剂量和治疗剂量电离辐射下的人的生物剂量测定

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Dynamic changes of the chromosomal aberrations and the DNA damage were analyzed in individuals exposed to low and therapeutic doses of radiation. The investigation included 37 persons living in areas where the radioactive sources were discovered 10–12 years ago. It was established by biodosimetry methods that the examined persons had absorbed dose of 0.2–0.7 Gy or had increased number of chromosomal aberrations, though insufficient to determine a dose. Clinical examination, chromosomal analysis, and assay of DNA damage by the comet (single-cell gel electrophoresis) assay were carried out. There was no correlation between the doses received 10 years ago and the cytogenetic changes with clinical outcome. The effect of the local fractionated gamma-irradiation with doses of 40–70 Gy was studied in cancer patients with localized head and neck tumors. The study of chromosomal abnormalities, the DNA damages by the comet assay, and the micronuclei detection of the buccal cells revealed a statistically significant correlation between the initial cytogenetic indices in cancer patients and their dynamic changes during and after the radiation exposure. In addition, the correlation was detected between the initial cytogenetic parameters and the functional stage of red blood system. Our results allow us to conclude that there is a need for further research to estimate the individual radiation risk to optimize and individualize the subsequent medical management of radiotherapy.
机译:在暴露于低剂量和治疗剂量的个体中分析了染色体畸变的动态变化和DNA损伤。调查包括10到12年前发现放射源的地区的37人。通过生物剂量学方法确定,尽管不足以确定剂量,被检查者吸收的剂量为0.2-0.7 Gy或染色体畸变数量增加。进行了临床检查,染色体分析和彗星DNA损伤检测(单细胞凝胶电泳)。 10年前接受的剂量与细胞遗传学变化与临床结局之间没有相关性。在患有局部头颈部肿瘤的癌症患者中,研究了剂量为40–70 Gy的局部分装伽马射线辐照的效果。染色体异常,彗星试验对DNA的损伤以及颊细胞的微核检测的研究表明,癌症患者的初始细胞遗传学指标与其在放射线照射期间和之后的动态变化之间存在统计学上的显着相关性。另外,在初始细胞遗传学参数和红血系统功能阶段之间检测到相关性。我们的结果使我们得出结论,需要进行进一步的研究来估计个体放射风险,以优化和个性化随后的放射治疗医学管理。

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