首页> 外文期刊>Antioxidants and redox signalling >Do proteomics analyses provide insights into reduced oxidative stress in the brain of an Alzheimer disease transgenic mouse model with an M631L amyloid precursor protein substitution and thereby the importance of amyloid-beta-resident methionine 35 in Alzheimer disease pathogenesis?
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Do proteomics analyses provide insights into reduced oxidative stress in the brain of an Alzheimer disease transgenic mouse model with an M631L amyloid precursor protein substitution and thereby the importance of amyloid-beta-resident methionine 35 in Alzheimer disease pathogenesis?

机译:蛋白质组学分析是否可提供有关M631L淀粉样蛋白前体蛋白替代的阿尔茨海默氏病转基因小鼠模型脑部氧化应激降低的见解,以及淀粉样蛋白-β-蛋氨酸35在阿尔茨海默氏病发病机理中的重要性?

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摘要

The single methionine (Met/M) residue of amyloid-beta (Aβ) peptide, at position 35 of the 42-mer, has important relevance for Aβ-induced oxidative stress and neurotoxicity. Recent in vivo brain studies in a transgenic (Tg) Alzheimer disease (AD) mouse model with Swedish and Indiana familial AD mutations in human amyloid precursor protein (APP) (referred to as the J20 Tg mouse) demonstrated increased levels of oxidative stress. However, the substitution of the Met631 residue of APP to leucine (Leu/L) (M631L in human APP numbering, referred to as M631L Tg and corresponding to residue 35 of Aβ1-42) resulted in no significant in vivo oxidative stress levels, thereby supporting the hypothesis that Met-35 of Aβ contributes to oxidative insult in the AD brain. It is conceivable that oxidative stress mediated by Met-35 of Aβ is important in regulating numerous downstream effects, leading to differential levels of relevant biochemical pathways in AD. Therefore, in the current study using proteomics, we tested the hypothesis that several brain proteins involved in pathways such as energy and metabolism, antioxidant activity, proteasome degradation, and pH regulation are altered in J20Tg versus M631L Tg AD mice.
机译:淀粉样β(Aβ)肽的单个蛋氨酸(Met / M)残基位于42-mer的35位,与Aβ诱导的氧化应激和神经毒性具有重要的关系。最近在人类淀粉样蛋白前体蛋白(APP)(称为J20 Tg小鼠)中具有瑞典和印第安纳家族AD突变的转基因(Tg)阿尔茨海默病(AD)小鼠模型中的体内大脑研究表明,氧化应激水平升高。然而,将APP的Met631残基替换为亮氨酸(Leu / L)(人APP编号中的M631L,称为M631L Tg,对应于Aβ1-42的残基35)导致体内氧化应激水平不显着,因此支持Aβ的Met-35有助于AD脑氧化损伤的假说。可以想象,由Aβ的Met-35介导的氧化应激在调节众多下游效应中很重要,从而导致AD中相关生化途径的水平不同。因此,在当前使用蛋白质组学的研究中,我们测试了以下假设:J20Tg与M631L Tg AD小鼠相比,参与能量和代谢,抗氧化活性,蛋白酶体降解和pH调节等途径的几种脑蛋白发生了改变。

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