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Genetic Evidence of an Evolutionarily Conserved Role for Nrf2 in the Protection against Oxidative Stress

机译:Nrf2在抗氧化应激保护中的进化保守作用的遗传证据。

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Transcription factor Nrf2 is considered a master regulator of antioxidant defense in mammals. However, it is unclear whether this concept is applicable to nonmammalian vertebrates, because no animal model other than Nrf2 knockout mice has been generated to examine the effects of Nrf2 deficiency. Here, we characterized a recessive loss-of-function mutant of Nrf2 (nrf2fh318) in a lower vertebrate, the zebrafish (Danio rerio). In keeping with the findings in the mouse model, nrf2fh318 mutants exhibited reduced induction of the Nrf2 target genes in response to oxidative stress and electrophiles but were viable and fertile, and their embryos developed normally. The nrf2fh318 larvae displayed enhanced sensitivity to oxidative stress and electrophiles, especially peroxides, and pretreatment with an Nrf2-activating compound, sulforaphane, decreased peroxide-induced lethality in the wild type but not nrf2fh318 mutants, indicating that resistance to oxidative stress is highly dependent on Nrf2 functions. These results reveal an evolutionarily conserved role of vertebrate Nrf2 in protection against oxidative stress. Interestingly, there were no significant differences between wild-type and nrf2fh318 larvae with regard to their sensitivity to superoxide and singlet oxygen generators, suggesting that the importance of Nrf2 in oxidative stress protection varies based on the type of reactive oxygen species (ROS).
机译:转录因子Nrf2被认为是哺乳动物抗氧化防御的主要调节剂。但是,尚不清楚该概念是否适用于非哺乳动物的脊椎动物,因为除Nrf2基因敲除小鼠以外,没有其他动物模型可以用来研究Nrf2缺乏症的影响。在这里,我们表征了低等脊椎动物斑马鱼(Danio rerio)中Nrf2( nrf2 fh318 )的隐性功能丧失突变体。与小鼠模型中的发现一致, nrf2 fh318 突变体表现出对Nrf2靶基因诱导的氧化应激和亲电试剂响应降低,但是既能存活又能繁殖,它们的胚胎正常发育。 nrf2 fh318 幼虫显示出对氧化应激和亲电子试剂(特别是过氧化物)的增强敏感性,并使用Nrf2活化化合物萝卜硫烷进行预处理,减少了过氧化物-nrf2 fh318 突变体引起的野生型致死性,表明对氧化应激的抗性高度依赖于Nrf2的功能。这些结果揭示了脊椎动物Nrf2在保护抗氧化应激方面的进化保守作用。有趣的是,野生型和 nrf2 fh318 幼虫在对超氧化物和单线态氧产生剂的敏感性方面没有显着差异,这表明Nrf2在氧化应激保护中的重要性因活性氧(ROS)的类型而异。

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