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Biol Psychiat:脑中谷胱甘肽水平——轻度认知障碍和AD的一种新的生物标志物

2015-10-23 candy 译 MedSci原创

背景:从现存的活体动物模型和尸检研究的数据表明,阿尔茨海默氏病(AD)的病理与大脑中抗氧化剂谷胱甘肽(GSH)的减少有关,但缺乏直接的临床证据。在这项研究中,研究人员研究了阿尔茨海默氏病(AD)中抗氧化剂谷胱甘肽(GSH)的调制;估计海马(HP)与额叶皮层(FC)中的GSH水平,评估AD、AD前驱期和轻度认知障碍(MCI)的生物标志物的诊断机制。方法:GSH组包括21例阿尔茨海默氏病患者(AD),

背景:现存的活体动物模型和尸检研究的数据表明,阿尔茨海默氏病(AD)的病理与大脑中抗氧化剂谷胱甘肽(GSH)的减少有关,但缺乏直接的临床证据。在这项研究中,研究人员研究了阿尔茨海默氏病(AD)中抗氧化剂谷胱甘肽(GSH)的调制;估计海马(HP)与额叶皮层(FC)中的GSH水平,评估AD、AD前驱期和轻度认知障碍(MCI)的生物标志物的诊断机制。

方法:GSH组包括21例阿尔茨海默氏病患者(AD), 22例轻度认知障碍患者(MCI),健康老年21例,测量其大脑海马区(HP)的抗氧化剂谷胱甘肽(GSH)水平;另外,磁共振组包括19例AD,19例MCI,28例HC,进行活体质子磁共振波谱检测。线性回归模型被用来决定各脑区GSH估计的最佳组合,以区分AD、MCI和HC者。

结果:研究发现阿尔茨海默氏病患者的GSH水平在海马(HP)与额叶皮层(FC)中显著减小(P< .001)。而且,研究发现这些脑区GSH的减小与认知功能的减退有相关性。接收操作特性分析表明,海马区GSH可明显区分轻度认知障碍(MCI)和健康对照者,灵敏性为87.5%,特异性为100%,阳性与阴性的似然比(LR)为8.76/.13;而外皮层的GSH区分MCI与AD的灵敏性为91.7%,特异性为 100%,阳性与阴性的似然比为9.17/.08。

结论:本研究提供了令人信服的体内证据,表明在磁共振波谱的特定大脑区域的GSH水平估计是与MCI和AD临床相关的生物标志物。

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