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Vanadium pentoxide: an oxidative stress agent which disturbs glutathione conjugates metabolization in Saccharomyces cerevisiae UE-ME3

机译:五氧化二钒:一种氧化应激物质,可干扰酿酒酵母UE-ME3中的谷胱甘肽共轭物代谢。

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摘要

Under physiological conditions the vanadium can be detected in the oxidation state V (+5), a very toxic specie. Inthis study we used a wine wild-type Saccharomyces cerevisiae UE-ME3 to assess how eukaryotic cells respond toV2O5. Yeast cells in exponential phase were inoculated into YEPD medium with 2% (w / v) glucose and allowedto grow in the absence or presence of 0.5 to 2.0 mM V2O5 during 72 h. The results show that the cellularenvironment became more oxidizing, cell damages increase and failures in the transport and excretion of aminoacids to the vacuole ocurr in yeast cells grown in the presence of vanadium (+5), as can be inferred by thedecrease of GSH/GSSG ratio, increase of MDA cytoplasmic level and the sharp decrease of g-GT activityobserved. Although there was an apparent response anti-stress to V2O5, reflected in an increase of GR activity inall trials of metal exposure and of GPx in cells exposed to 1.5 and 2.0 mM, this was probably mitigated by thedecrease in activity G6PD and consequent availability of NADPH which compromise cell viability.
机译:在生理条件下,可以检测到钒的氧化态V(+5),这是一种剧毒物质。在这项研究中,我们使用了葡萄酒野生型酿酒酵母UE-ME3来评估真核细胞对V2O5的反应。将指数期的酵母细胞接种到含2%(w / v)葡萄糖的YEPD培养基中,让其在存在或不存在0.5至2.0 mM V2O5的情况下生长72小时。结果表明,在存在钒(+5)的酵母细胞中,细胞环境变得更加氧化,细胞损伤增加,氨基酸向液泡的运输和排泄失败,这可以通过GSH / GSSG的降低来推断。比例,MDA细胞质水平的增加和g-GT活性的急剧下降。尽管对V2O5有明显的抗应激反应,这反映在所有暴露于1.5和2.0 mM的细胞中的金属暴露和GPx试验中GR活性的增加,但G6PD活性的降低和随后NADPH的可用性可能减轻了这种活性。损害细胞活力。

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