Neurology:脑结构与功能作为淀粉样蛋白中间介质影响记忆

2015-02-24 MedSci MedSci原创

本研究的目的是检验在老年痴呆症早期,β淀粉样蛋白(Aβ) 对情景记忆的影响是否以新陈代谢和灰质容积为介质。研究方法:这是一个前瞻性的队列研究。我们测量了Aβ、脑部功能及构造的基线水平。通过介质分析,检测统计出的Aβ 阳性对横向及纵向情景记忆的影响是否以代谢减退或局部的灰质容积为介质。分析分为两组进行:认知健康对照组(CN, n = 280)及轻度认知功能障碍组(MCI, n = 463).。研究结

本研究的目的是检验在老年痴呆症早期,β淀粉样蛋白(Aβ) 对情景记忆的影响是否以新陈代谢和灰质容积为介质。

研究方法:
这是一个前瞻性的队列研究。我们测量了Aβ、脑部功能及构造的基线水平。通过介质分析,检测统计出的Aβ 阳性对横向及纵向情景记忆的影响是否以代谢减退或局部的灰质容积为介质。分析分为两组进行:认知健康对照组(CN, n = 280)及轻度认知功能障碍组(MCI, n = 463).。

研究结果:
较低的记忆力得分与Aβ 阳性、较小灰质容积及代谢减退相关。在MCI组,Aβ 的影响以较小容积及代谢减退为介质,在CN组则不然。最强的独立区域介导率约为25%,脑部构造及功能介导率约为40%。在若干区域,灰质萎缩和代谢减退可能会影响情景记忆,与Aβ 阳性无关 (at p < 0.05)。

研究结论:
某种程度上,脑部构造和功能的改变似乎是Aβ 病变的后阶段的结果,最终导致情景记忆的减退。然而,Aβ 病变也会通过不能用这些影像测量量化的机制与记忆力减退密切相关,且情景记忆力的衰退部分是由与老年痴呆症相似的脑部变化导致,与Aβ 病变无关。

原始出处:
Niklas Mattsson, MD, PhD, Philip S. Insel, MS, Paul S. Aisen, MD, PhD, William Jagust, MD, Scott Mackin, PhD, Michael Weiner, MD; For the Alzheimer's Disease Neuroimaging Initiative
Brain structure and function as mediators of the effects of amyloid on memory
February 13, 2015

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    2015-12-21 yinhl1978
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    2015-02-28 xiaoai5777

    不错的文章,学习了

    0

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    2015-02-25 wmr116

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  美国加州大学戴维斯分校阿尔茨海默病中心的科研人员进行的一项研究发现,与胰岛素一起分泌的一种蛋白通过血流运动,并且在2型糖尿病和痴呆患者的大脑中积累,其方式和与阿尔茨海默病有关联的β淀粉样蛋白斑一样。   该研究首次在阿尔茨海默病患者大脑中发现了这种被称为胰淀素的蛋白的沉积,还发现了胰淀素与β淀粉样蛋白斑的联合沉积,这提示胰淀素是第二种淀粉样蛋白,而且也是与年龄有关的痴呆和阿尔茨海默病