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大脑中粉样β-水平升高与认知能力下降之间的相关性
J Näslund1, V Haroutunian, R Mohs
1Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, NY, USA.
JAMA
|March 29, 2000
概括
阿尔茨海默病 (AD) 涉及粉样β- (Abeta) 积累与认知能力下降相关. 阿贝塔水平提早上升,先于tau病理,支持阿贝塔向的AD治疗.
科学领域:
- 神经科学是一个神经科学.
- 神经病理学神经病理学
- 老年学是一门学科.
背景情况:
- 阿尔茨海默氏病 (AD) 在神经病理上是由粉样β- (Abeta) 斑块和团组成的.
- 在阿尔茨海默病研究中的一个关键辩论是关于阿贝塔积累和痴呆症严重程度之间的相关性,以及阿贝塔和病理之间的时间关系.
研究的目的:
- 调查阿贝塔积累与早期认知恶化指标之间的相关性.
- 阐明阿贝塔积累的进展与陶蛋白早期变化之间的关系.
主要方法:
- 一项死后横截面研究,涉及79名养老院住户,临床痴呆评分 (CDR) 分数各不相同 (0.0-5.0).
- 在五个新皮层大脑区域的阿贝塔变体 (A(beta) x-40和A(beta) x-42) 的量化.
- 评估前额叶皮质早期的蛋白形状变化,与CDR得分相关.
主要成果:
- 甚至在具有可疑痴呆症的个体中也观察到A(beta) x-40和A(beta) x-42的水平升高 (CDR 0.5).
- 两个阿贝塔的增加与痴呆症严重程度的进展密切相关.
- 即使在没有痴呆症的个体中,A(β) x-42水平也始终高于A(β) x-40,并且这种模式在整个疾病进展过程中持续存在.
- 最重要的是,发现A(beta) x-40和A(beta) x-42的增加在前额叶皮层出现显著的tau病理之前.
结论:
- 阿贝塔水平 (A(beta) x-40和A(beta) x-42) 在痴呆的早期阶段升高,并且与阿尔茨海默病的认知能力下降有很强的相关性.
- 阿贝塔积累在前额叶皮层的显著tau病理之前,支持阿贝塔在启动AD病变发生过程中发挥主要作用.
- 这些发现倡导针对阿贝塔的形成,积累或其细胞毒性作用的治疗策略,用于潜在的AD治疗.
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