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Disruption of Brain Redox Homeostasis, Microglia Activation and Neuronal Damage Induced by Intracerebroventricular Administration of S-Adenosylmethionine to Developing Rats

机译:脑氧化还原稳态的破坏,颅内甲基硫甲硫醚脑内施用对大鼠脑内脑内施用诱导的小胶质细胞活化和神经元损伤

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S-Adenosylmethionine (AdoMet) concentrations are highly elevated in tissues and biological fluids of patients affected by S-adenosylhomocysteine hydrolase deficiency. This disorder is clinically characterized by severe neurological symptoms, whose pathophysiology is not yet established. Therefore, we investigated the effects of intracerebroventricular administration of AdoMet on redox homeostasis, microglia activation, synaptophysin levels, and TAU phosphorylation in cerebral cortex and striatum of young rats. AdoMet provoked significant lipid and protein oxidation, decreased glutathione concentrations, and altered the activity of important antioxidant enzymes in cerebral cortex and striatum. AdoMet also increased reactive oxygen (2,7-dichlorofluorescein oxidation increase) and nitrogen (nitrate and nitrite levels increase) species generation in cerebral cortex. Furthermore, the antioxidants N-acetylcysteine and melatonin prevented most of AdoMet-induced pro-oxidant effects in both cerebral structures. Finally, we verified that AdoMet produced microglia activation by increasing Iba1 staining and TAU phosphorylation, as well as reduced synaptophysin levels in cerebral cortex. Taken together, it is presumed that impairment of redox homeostasis possibly associated with microglia activation and neuronal dysfunction caused by AdoMet may represent deleterious pathomechanisms involved in the pathophysiology of brain damage in S-adenosylhomocysteine hydrolase deficiency.
机译:S-腺苷甲硫氨酸(Adomet)浓度高度升高,受到S-腺眼肌细胞水解酶缺乏的患者的组织和生物液中的高度升高。这种疾病在临床上以严重的神经症状为特征,其病理生理学尚未建立。因此,我们研究了脑内脑皮脑皮,微血花症活化,突触菌蛋白水平和幼小大鼠纹状体中的氧化还原稳态,小胶质植物活化,突触菌水平和Tau磷酸化的影响。 Adomet激发了显着的脂质和蛋白质氧化,降低了谷胱甘肽浓度,并改变了脑皮层和纹状体中重要的抗氧化酶的活性。 Adomet还增加了在脑皮层中产生的反应性氧(2,7-二氯流荧光蛋白氧化增加)和氮(硝酸盐和硝酸盐水平增加)物种。此外,抗氧化剂N-乙酰半胱氨酸和褪黑激素在脑结构中防止了大部分诱导的促氧化剂效应。最后,我们通过增加IBA1染色和Tau磷酸化以及降低脑皮质的突触蛋白水平降低了Adomet来产生微血花症活化。据推测,它被推测,氧化还原稳态可能与Adomet引起的小胶质细胞活化和神经元功能障碍相关的损伤可能代表涉及S-腺眼囊肿水解酶缺乏症脑损伤的病理生理学的有害土地机制。

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