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首页> 外文期刊>Journal of Experimental Botany >Response to UV-C radiation in topo I-deficient carrot cells with low ascorbate levels.
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Response to UV-C radiation in topo I-deficient carrot cells with low ascorbate levels.

机译:低抗坏血酸水平的topo I缺陷胡萝卜细胞对UV-C辐射的响应。

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In animal cells, recent studies have emphasized the role played by DNA topoisomerase I (topo I) both as a cofactor of DNA repair complexes and/or as a damage sensor. All these functions are still unexplored in plant cells, where information concerning the relationships between DNA damage, PCD induction, and topo I are also limited. The main goal of this study was to investigate the possible responses activated in topo I-depleted plant cells under oxidative stress conditions which induce DNA damage. The carrot (Daucus carota L.) AT1-o/22 cell line analysed in this study (characterized by an antisense-mediated reduction of top1o gene expression of approximately 46% in association with a low ascorbate content) was more sensitive to UV-C radiation than the control line, showing consistent cell death and high levels of 8-oxo-dG accumulation. The topo I-depleted cells were also highly susceptible to the cross-linking agent mitomycin C. The death response was associated with a lack of oxidative burst and there were no changes in ascorbate metabolism in response to UV-C treatment. Electron and fluorescence microscopy suggested the presence of three forms of cell death in the UV-C-treated AT1-o/22 population: necrosis, apoptotic-like PCD, and autophagy. Taken together, the data reported here support a reduced DNA repair capability in carrot topo I-deficient cells while the putative relationship between topo I-depletion and ascorbate impairment is also discussed.
机译:在动物细胞中,最近的研究强调了DNA拓扑异构酶I(拓扑I)作为DNA修复复合物的辅助因子和/或损伤传感器的作用。所有这些功能在植物细胞中仍未开发,有关DNA损伤,PCD诱导和topo I之间关系的信息也很有限。这项研究的主要目的是研究在氧化应激条件下导致DNA损伤的top I耗尽植物细胞中可能激活的反应。在这项研究中分析的胡萝卜(Daucus carota L.)AT1-o / 22细胞系(特征在于反义介导的top1o基因表达降低约46%,同时抗坏血酸含量低)对UV-C更为敏感辐射比对照线高,显示出一致的细胞死亡和高水平的8-oxo-dG积累。耗尽了topo I的细胞也对交联剂丝裂霉素C高度敏感。死亡反应与缺乏氧化爆发有关,并且抗坏血酸代谢的变化没有响应于UV-C处理。电子显微镜和荧光显微镜表明,在经紫外线-C处理的AT1-o / 22人群中存在三种细胞死亡形式:坏死,凋亡样PCD和自噬。综上所述,此处报道的数据支持胡萝卜topo I缺陷细胞中DNA修复能力的降低,同时还讨论了topo I耗竭与抗坏血酸损害之间的推定关系。

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