单纤维福斯特共振能量转移成像和深度学习揭示了粉样β 42聚合通路的度依赖性
Sara H Sohail1, Janghyun Yoo1, Hoi Sung Chung1
1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.
PNAS nexus
|November 13, 2025
概括
粉样纤维的形成显示出显著的异质性. 实时弗斯特共振能量转移 (FRET) 成像显示,粉样β 42 (Aβ42) 聚合途径根据单体度不同,影响纤维结构.
科学领域:
- 生物化学 生化学
- 生物物理学的生物物理.
- 神经科学是一个神经科学.
背景情况:
- 粉样纤维的形成是一个复杂的,异质的过程.
- 纤维细胞结构的多态性与各种疾病有关.
- 了解聚合异质性对于了解疾病机制至关重要.
研究的目的:
- 开发和应用弗斯特共振能量转移 (FRET) 成像技术,用于实时分析粉样纤维的形成.
- 为了研究粉样β 42 (Aβ42) 纤维形成中的度依赖异质性.
- 根据FRET效率,受体光寿命和单体固体测量来表征单个纤维.
主要方法:
- 粉样纤维素形成的实时FRET成像.
- 未标记和标记 (捐赠者/接受者) Aβ42单体的化.
- 使用FRET效率,接受器光寿命和静电测量对单个纤维的表征.
主要成果:
- 在2μM Aβ42时,一个高FRET物种最初形成,其次是一个主导的低FRET物种.
- 在4μM Aβ42时,高FRET物种在整个聚合过程中保持主导地位.
- 分析表明每个度至少有三个不同的纤维物种,在度之间存在差异,与已知的纤维结构一致.
结论:
- 单体度显著影响Aβ42纤维素形成途径和由此产生的结构.
- 纤维的异质性是一个关键因素,必须在生物学上相关的聚合环境中考虑.
- 实时FRET成像为剖析复杂的粉样蛋白聚合过程提供了强大的工具.
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