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首页> 外文期刊>Journal of biochemical and molecular toxicology >Effect of copper intoxication on rat liver proteasome activity: relationship with oxidative stress.
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Effect of copper intoxication on rat liver proteasome activity: relationship with oxidative stress.

机译:铜中毒对大鼠肝蛋白酶体活性的影响:与氧化应激的关系。

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摘要

Copper toxicity is associated with formation of reactive oxygen species, which are capable to oxidize proteins. The selective removal of the latter by the 20S proteasome is considered an essential part of the cell antioxidant defense system. The aim of the present study was to investigate whether peptidase activities of rat liver proteasomes were affected by chronic (40 mg CuSO(4)/rat/daily with the drinking water for 2 weeks) and acute (20 mg/kg CuSO(4), s.c.) copper treatment. To evaluate the role of proteasome, its inhibitor MG132 was also used. The degree of copper-induced oxidative stress (OS), established by measuring lipid peroxidation, protein oxidation, and cellular glutathione level, as well as activities of antioxidant enzymes--catalase, superoxide dismutase, and gultathionine peroxidase, depended on the mode of copper administration. Chronic copper administration (mild oxidative stress) did not affect proteasome activities, whereas acute copper treatment (severe oxidative stress) caused a decline in chymotryptic- and tryptic-like activities. The treatment of copper-loaded animals with MG132 did not change copper-induced alterations in the tested indices, except an additional increase in protein oxidation and inhibition of glutathionine peroxidase activity. The results suggested that the in vivo copper-induced oxidative stress was associated with changes in the catalytic activity of proteasome.
机译:铜的毒性与能够氧化蛋白质的活性氧形成有关。 20S蛋白酶体选择性去除后者被认为是细胞抗氧化剂防御系统的重要组成部分。本研究的目的是研究大鼠肝脏蛋白酶体的肽酶活性是否受到慢性(40 mg CuSO(4)/大鼠/每天饮水2周)和急性(20 mg / kg CuSO(4))的影响,sc)铜处理。为了评估蛋白酶体的作用,还使用了其抑制剂MG132。铜诱导的氧化应激(OS)的程度通过测量脂质过氧化,蛋白质氧化和细胞内的谷胱甘肽水平以及抗氧化酶的活性-过氧化氢酶,超氧化物歧化酶和谷胱甘肽过氧化物酶来确定,取决于铜的模式行政。长期施用铜(轻度氧化应激)不会影响蛋白酶体的活性,而急性铜处理(严重氧化应激)会导致糜蛋白酶和类胰蛋白酶的活性下降。用MG132处理含铜动物不会改变铜诱导的测试指标变化,只是蛋白质氧化进一步增加并抑制了谷胱甘肽过氧化物酶活性。结果表明,体内铜诱导的氧化应激与蛋白酶体催化活性的变化有关。

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