The level of induced DNA double-strand breaks does not correlate with cell killing in X-irradiated mitotic and G1-phase CHO cells.

The level of induced DNA double-strand breaks does not correlate with cell killing in X-irradiated mitotic and G1-phase CHO cells.
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在 X 射线照射的有丝分裂和 G1 期 CHO 细胞中,诱导的 DNA 双链断裂水平与细胞杀伤无关。

DOI:
10.1080/09553008814552531
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发表时间:
1988
期刊:
International journal of radiation biology and related studies in physics, chemistry, and medicine
影响因子:
--
通讯作者:
Okayasu,R
Okayasu,R
中科院分区:
--
文献类型:
--
作者:
Iliakis,G;Okayasu,R

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本文用中性(pH9.6)滤膜洗脱技术研究了不同孵育条件和辐射后处理条件下,有丝分裂期和G1期受照CHO细胞DNA损伤的情况。有丝分裂期和G1/S期边缘细胞比G1期细胞对辐射更敏感,但表现出相似的(G1/S)或更低的(M)DNA洗脱剂量-反应曲线。类似的细胞存活率和DNA/洗脱剂量-反应曲线,获得与plateauphase文化主要包含G1-细胞,以及与G1细胞分裂后获得的有丝分裂细胞在新鲜或条件培养基。然而,平台期细胞的存活率可以通过延迟接种或辐射后用araA处理而显著改变。这些结果,连同以前发表的意见,表明DNA双链断裂的诱导不能被调用作为一个解释的变化,在整个周期中观察到的放射敏感性,或作为一个解释形成的生存曲线肩。有人提出,修复和固定辐射诱导的DNA损伤,在细胞存活水平上表达为修复和固定的α-PLD,是负责这些影响。
The neutral (pH 9·6) filter elution technique was used to evaluate DNA damage induced in CHO cells irradiated at mitosis or in G1-phase under various incubation and postirradiation treatment conditions. Mitotic and G1/S border cells were more sensitive to radiation than G1cells with respect to cell killing, but showed similar (G1/S) or lower (M) DNA elution dose–response curves. Similar cell survival and DNA/elution dose–response curves were obtained with plateauphase cultures containing mainly G1-cells, as well as with G1cells obtained after division of mitotic cells in either fresh or conditioned medium. However, survival of plateau-phase cells could be modified substantially by delayed-plating or postirradiation treatment with araA. These results, together with previously published observations, indicate that induction of DNA dsb cannot be invoked as an explanation for the variations in radiosensitivity observed through the cycle, or as an explanation for the formation of the survival curve shoulder. It is proposed that repair and fixation of radiation-induced DNA damage, expressed at the cell survival level as repair and fixation of alpha-PLD, are responsible for these effects.
通过艾利希腹水肿瘤细胞的细胞周期观察到的证据表明,潜在致命损伤的修复和表达会导致 X 照射后细胞存活率的变化。
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