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Oxidative stress alters arginine metabolism in rat brain: effect of sub-convulsive hyperbaric oxygen exposure.

机译:氧化应激会改变大鼠脑中的精氨酸代谢:亚抽搐高压氧暴露的影响。

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摘要

The effect of hyperbaric oxygenation on arginine metabolism was investigated. Rats were exposed to oxygen at 3 atmospheres absolute for 2 h. Under these conditions, lipid peroxidation and activation of the anti-oxidant system were observed. Levels of thiobarbiturate reactive substances and carbon-centered radicals were increased in the cerebral cortex, while superoxide dismutase activity was also increased in the mitochondrial and cytosolic fraction of cerebrocortical homogenates. This suggested that the increase of both Mn and Cu,Zn-superoxide dismutase activities was probably an early compensatory reaction to oxidative stress. Levels of arginine as well as its metabolite, guanidinoacetic acid, were increased in the cerebral cortex. This increase seemed to be, at least in part, explained by a decrease in the arginase activity in the same region. Moreover, arginase activity in the brain showed heterogeneous distribution. Arginine: glycine amidinotransferase activity was decreased in the pons-medulla oblongata. The observed effects of hyperbaric oxygenation seem to favor nitric oxide generation.
机译:研究了高压氧对精氨酸代谢的影响。大鼠在3个绝对大气压下暴露于氧气2小时。在这些条件下,观察到脂质过氧化和抗氧化剂系统的活化。大脑皮层中的硫代巴比妥酸酯反应性物质和以碳为中心的自由基水平增加,而脑皮质匀浆的线粒体和胞质部分中的超氧化物歧化酶活性也增加。这表明锰和铜,锌超氧化物歧化酶活性的增加可能是对氧化应激的早期补偿反应。大脑皮层中精氨酸及其代谢产物胍基乙酸的含量增加。这种增加似乎至少部分是由相同区域中精氨酸酶活性的下降所解释的。此外,大脑中的精氨酸酶活性表现出异质性分布。精氨酸:延髓中甘氨酸酰胺基转移酶活性降低。高压氧的观察到的作用似乎有利于一氧化氮的产生。

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