Quaternary Structure Defines a Large Class of Amyloid-β Oligomers Neutralized by Sequestration.

Quaternary Structure Defines a Large Class of Amyloid-β Oligomers Neutralized by Sequestration.
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DOI:
10.1016/j.celrep.2015.05.021
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发表时间:
2015-06-23
期刊:
影响因子:
8.8
通讯作者:
Ashe KH
Ashe KH
中科院分区:
生物学1区
文献类型:
--
作者:
Liu P;Reed MN;Kotilinek LA;Grant MK;Forster CL;Qiang W;Shapiro SL;Reichl JH;Chiang AC;Jankowsky JL;Wilmot CM;Cleary JP;Zahs KR;Ashe KH

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淀粉样蛋白-β(Aβ)作为淀粉样纤维和毒性寡聚体的积累是阿尔茨海默病(AD)发展的重要步骤。然而,有许多潜在的毒性低聚物,当在活体大脑中产生时,对其神经系统的影响知之甚少。在这里,我们表明Aβ低聚物可以根据其与淀粉样蛋白原纤维的时间、空间和结构关系被分配到至少两种类型(1型和2型)中的一种。2型寡聚体与淀粉样蛋白原纤维相关,代表体内产生的大多数寡聚体,但仍局限于淀粉样蛋白斑块附近,并且在与AD相关的水平上不损害认知。1型寡聚体与淀粉样蛋白原纤维无关,并且可能具有更大的潜力导致AD中的整体神经功能障碍,因为它们是分散的。这些结果完善了我们对Aβ寡聚体体内致病性的理解。
The accumulation of amyloid-β (Aβ) as amyloid fibrils and toxic oligomers is an important step in the development of Alzheimer's disease (AD). However, there are numerous potentially toxic oligomers and little is known about their neurological effects when generated in the living brain. Here, we show that Aβ oligomers can be assigned to one of at least two classes (Type 1 and Type 2) based on their temporal, spatial and structural relationships to amyloid fibrils. The Type 2 oligomers are related to amyloid fibrils and represent the majority of oligomers generated in vivo, but remain confined to the vicinity of amyloid plaques and do not impair cognition at levels relevant to AD. Type 1 oligomers are unrelated to amyloid fibrils and may have greater potential to cause global neural dysfunction in AD because they are dispersed. These results refine our understanding of the pathogenicity of Aβ oligomers in vivo.
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