Nano-Infrared Imaging of Primary Neurons.

Nano-Infrared Imaging of Primary Neurons.
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原代神经元的纳米红外成像。

DOI:
10.3390/cells10102559
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发表时间:
2021-09-27
期刊:
影响因子:
6
通讯作者:
Klementieva O
Klementieva O
中科院分区:
生物学2区
文献类型:
--
作者:
Freitas RO;Cernescu A;Engdahl A;Paulus A;Levandoski JE;Martinsson I;Hebisch E;Sandt C;Gouras GK;Prinz CN;Deierborg T;Borondics F;Klementieva O

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阿尔茨海默病(AD)约占神经退行性疾病的70%,是三分之一老年人认知能力下降和死亡的原因。AD目前诊断不足,无法有效预防。淀粉样蛋白-β(Aβ)蛋白的聚集与AD的发展有关,并且已经确定,在病理条件下,Aβ蛋白经历结构变化以形成被认为具有神经毒性的β-折叠结构。许多深入的体外研究提供了关于淀粉样蛋白多晶型物的详细信息;然而,关于富含淀粉样蛋白β-片层的聚集体如何在相关环境中引起神经毒性知之甚少。我们使用散射型扫描近场光学显微镜(s-SNOM)来研究单个神经元中纳米级的淀粉样蛋白结构。具体来说,我们表明,在经过充分验证的系统中,s-SNOM可以检测单个神经元中具有纳米空间分辨率的淀粉样蛋白β折叠结构。这是一项概念验证研究,证明s-SNOM可用于检测纳米级细胞表面的Aβ折叠结构。此外,这项研究旨在提高神经生物学家对s-SNOM作为分析神经元中纳米级淀粉样蛋白β折叠结构而无需免疫标记的工具的潜力的认识。
Alzheimer’s disease (AD) accounts for about 70% of neurodegenerative diseases and is a cause of cognitive decline and death for one-third of seniors. AD is currently underdiagnosed, and it cannot be effectively prevented. Aggregation of amyloid-β (Aβ) proteins has been linked to the development of AD, and it has been established that, under pathological conditions, Aβ proteins undergo structural changes to form β-sheet structures that are considered neurotoxic. Numerous intensive in vitro studies have provided detailed information about amyloid polymorphs; however, little is known on how amyloid β-sheet-enriched aggregates can cause neurotoxicity in relevant settings. We used scattering-type scanning near-field optical microscopy (s-SNOM) to study amyloid structures at the nanoscale, in individual neurons. Specifically, we show that in well-validated systems, s-SNOM can detect amyloid β-sheet structures with nanometer spatial resolution in individual neurons. This is a proof-of-concept study to demonstrate that s-SNOM can be used to detect Aβ-sheet structures on cell surfaces at the nanoscale. Furthermore, this study is intended to raise neurobiologists’ awareness of the potential of s-SNOM as a tool for analyzing amyloid β-sheet structures at the nanoscale in neurons without the need for immunolabeling.
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