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Dependence of mice fibrobslasts radiosensitivity on the exposure conditions

机译:小鼠成纤维细胞对放射敏感性的依赖性

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In the scientific literature there is lengthy discussion concerning utilization of low-dose hypersensitivity and bystander in radiation therapy which inspired us to investigate these effects using cells of mice fibroblasts C3H10T1/2. Irradiated were monolayers of fibroblasts cells cultivated on wall of plastic vials. To study the bystander effect, the therapeutic proton beam with the onset energy of 150 Me V was directed at the whole wall (25 cr2) or only the central area of 1 cv(2). In an hour after irradiation the cells were dispersed in 0.25 % tripsin solution and inoculated in vials for survivability analysis. In both cases survivability of the cells was essentially equal following irradiation by 0.5 Gy, 2 Gy and 5 Gy. The same observation was made also after fractionated irradiation by the total doses of 10 and 20 Gy (2 Gy per a day, 5 times a week). In these experiments, each time another area (1 cm(2)) of the vial wall was subjected to irradiation. Three 0.4 Gy fractionated irradiations of cellsC3H10OT1/2 per a day (5 times a week) by gamma-source 60Co with an interval of 3 hours showed that the total dose of 6 Gy and 12 Gy gathered by this protocol had the strongest lethal effect on fibroblast cells as compared with the daily one-time irradiation by 1.2 Gy. According to these results, detail studies of the low-dose hypersensitivity and bystander effects may come up with their effective utilization in radiation therapy. medicine
机译:在科学文献中,关于低剂量超敏反应和旁观者在放射治疗中的利用已进行了长时间的讨论,这激发了我们利用小鼠成纤维细胞C3H10T1 / 2的细胞研究这些作用的灵感。辐照在塑料瓶壁上培养的成纤维细胞单层。为了研究旁观者效应,将治疗能量为150 Me V的质子束对准整个壁(25 cr2)或仅将中心区域1 cv(2)对准。辐射后一小时,将细胞分散在0.25%的tripsin溶液中,并接种在小瓶中以进行生存力分析。在两种情况下,在0.5 Gy,2 Gy和5 Gy照射后,细胞的存活率基本相等。在分次照射总剂量为10和20 Gy(每天2 Gy,每周5次,每天)后,也进行了相同的观察。在这些实验中,每次对小瓶壁的另一区域(1 cm(2))进行辐照。每天(每周5次)用γ-源60Co对细胞C3H10OT1 / 2进行3次0.4 Gy的分次照射,间隔3小时,表明该协议收集的6 Gy和12 Gy的总剂量对C3H10OT1 / 2具有最强的致命作用成纤维细胞与每日一次经1.2 Gy照射相比。根据这些结果,对低剂量超敏反应和旁观者效应的详细研究可能与它们在放射治疗中的有效利用有关。药物

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