Aβ receptors specifically recognize molecular features displayed by fibril ends and neurotoxic oligomers.

Aβ receptors specifically recognize molecular features displayed by fibril ends and neurotoxic oligomers.
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DOI:
10.1038/s41467-021-23507-z
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发表时间:
2021-06-08
影响因子:
16.6
通讯作者:
Harris DA
Harris DA
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Amin L;Harris DA

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已经描述了几种神经毒性淀粉样蛋白-β (Aβ)的细胞表面受体,但它们与Aβ组装的分子相互作用以及它们在介导阿尔茨海默病病理中的相对作用仍然不确定。在这里,我们使用超分辨率显微镜在纳米尺度上直接观察a β受体的相互作用。我们报道了一种记录的Aβ受体PrPC,通过结合每个纤维的快速生长端特异性地抑制Aβ原纤维的聚合,从而阻止该端极化伸长。PrPC以类似的方式结合神经毒性低聚物和原纤维,这表明它可能在所有这些组装上识别一个共同的、末端特异性的结构基序。最后,另外两个a β受体fc - γ riib和LilrB2以类似于PrPC的方式影响a β纤维的生长。我们的研究结果表明,受体可能通过与这些组件上的共同分子决定因子结合,将a β低聚物和原原纤维捕获在神经元表面,从而启动神经毒性信号。PrPC是a β低聚物的受体,通过与每根a β原纤维快速生长的末端结合来阻止a β原纤维的极化伸长。PrPC和其他受体可能通过与共同的分子决定因子结合,在神经元表面捕获a β低聚物和原原纤维,从而启动神经毒性信号。
Several cell-surface receptors for neurotoxic forms of amyloid-β (Aβ) have been described, but their molecular interactions with Aβ assemblies and their relative contributions to mediating Alzheimer’s disease pathology have remained uncertain. Here, we used super-resolution microscopy to directly visualize Aβ-receptor interactions at the nanometer scale. We report that one documented Aβ receptor, PrPC, specifically inhibits the polymerization of Aβ fibrils by binding to the rapidly growing end of each fibril, thereby blocking polarized elongation at that end. PrPC binds neurotoxic oligomers and protofibrils in a similar fashion, suggesting that it may recognize a common, end-specific, structural motif on all of these assemblies. Finally, two other Aβ receptors, FcγRIIb and LilrB2, affect Aβ fibril growth in a manner similar to PrPC. Our results suggest that receptors may trap Aβ oligomers and protofibrils on the neuronal surface by binding to a common molecular determinant on these assemblies, thereby initiating a neurotoxic signal. PrPC, a receptor for Aβ oligomers, blocks polarized elongation of Aβ fibrils by binding to the rapidly growing end of each fibril. PrPC and other receptors may trap Aβ oligomers and protofibrils on the neuronal surface by binding to a common molecular determinant, initiating a neurotoxic signal.
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