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首页> 外文期刊>Cell biology international. >Prooxidants prevent yeast cell death induced by genotoxic stress.
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Prooxidants prevent yeast cell death induced by genotoxic stress.

机译:前氧化剂可防止由遗传毒性应激诱导的酵母细胞死亡。

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摘要

It was shown earlier that DNA damage induced by alkylating agent MMS (methyl methanesulfonate) results in formation of ROS (reactive oxygen species) in yeast cells. Here, we asked whether this ROS generation is favourable for the cells. It appeared that prooxidants rather than antioxidants stimulate the survival after MMS treatment. We found that positively charged detergents increase the survival via induction of H2O2 formation in the cells. Interestingly, prooxidants protected yeast cells from the moderate doses of MMS and enhanced the toxicity of relatively high ones. Prooxidants also protect the cells arrested in mitosis (nocodazole treatment), indicating that the protection is mostly due to ROS-mediated transcriptional stress-response rather than due to enrichment of cell culture with highly MMS-resistant G2/M cells. The comparison of the published expression profile responses to prooxidant and MMS treatments identifies a set of ROS-activated genes, which are likely to protect cells from the genotoxic stress.
机译:较早的研究表明,烷基化剂MMS(甲磺酸甲酯)引起的DNA损伤导致酵母细胞中形成ROS(活性氧)。在这里,我们问这种ROS的产生是否对细胞有利。似乎在MMS处理后,前氧化剂而不是抗氧化剂会刺激生存。我们发现带正电荷的去污剂通过诱导细胞中过氧化氢的形成来增加存活率。有趣的是,抗氧化剂可以保护酵母细胞免受中等剂量的MMS侵害,并增强相对较高的MSE的毒性。促氧化剂还可以保护停在有丝分裂中的细胞(诺考达唑处理),这表明这种保护作用主要是由于ROS介导的转录应激反应,而不是由于细胞培养物对MMS的耐药性较高的G2 / M细胞的富集。比较已发表的对抗氧化剂和MMS处理的表达谱反应,可以鉴定出一组ROS激活基因,这些基因很可能保护细胞免受遗传毒性。

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