首页> 外文期刊>Somatic Cell and Molecular Genetics >A CELL LINE SELECTED FOR RESISTANCE TO IONIZING RADIATION EXHIBITS CROSS RESISTANCE TO OTHER GENOTOXIC AGENTS AND A MUTATOR PHENOTYPE FOR LOSS OF HETEROZYGOSITY EVENTS
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A CELL LINE SELECTED FOR RESISTANCE TO IONIZING RADIATION EXHIBITS CROSS RESISTANCE TO OTHER GENOTOXIC AGENTS AND A MUTATOR PHENOTYPE FOR LOSS OF HETEROZYGOSITY EVENTS

机译:选择抗电离辐射表现力的细胞系与其他遗传氧化代理抗性和杂合性事件丧失的突变表型

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An ionizing radiation resistant derivative was obtained from the mouse P19H22 (aprt hemizygote) embryonal carcinoma cell line by repented exposure to Cs-137 gamma radiation. Ionizing radiation resistance in the 6Gy-R cell line was not correlated with a failure to undergo cell cycle arrest or a loss of the p53 response after exposure to Cs-137 gamma radiation. Moreover the cells did not display increased resistance to bleomycin, a double strand break inducing agent. However, the cells did display increased resistance to ultraviolet radiation, ethyl methanesulfonate, and 95% oxygen. A mutational analysis demonstrated a >700 fold-fold increase in the frequency of aprt mutants for the 6Gy-R cells, bur no change in the frequency of hprt or dhfr mutants, A molecular analysis suggested that the aprt mutations in the 6Gy-R cells arose by recombinational events. A possible association between radiation resistance, DNA repair, and a mutator phenotype for large-scale mutational events is discussed.
机译:通过re悔地暴露于Cs-137γ射线,从小鼠P19H22(aprt半合子)胚胎癌细胞系中获得了一种抗电离辐射的衍生物。 6Gy-R细胞系中的电离辐射抗性与​​暴露于Cs-137γ辐射后未能经历细胞周期停滞或p53反应丧失无关。此外,细胞对博莱霉素(双链断裂诱导剂)的抗性没有增加。但是,这些细胞确实显示出对紫外线,甲磺酸乙酯和95%氧气的增强抵抗力。突变分析表明6Gy-R细胞的aprt突变频率增加> 700倍,而hprt或dhfr突变体的频率却没有变化。分子分析表明6Gy-R细胞的aprt突变由重组事件引起的。讨论了辐射耐受性,DNA修复和大规模突变事件的突变表型之间的可能联系。

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