D-π-A-Based Trisubstituted Alkenes as Environmentally Sensitive Fluorescent Probes to Detect Lewy Pathologies
作者:Qi Zeng、Yimin Chen、Yingying Yan、Rong Wan、Yanjing Li、Hualong Fu、Yu Liu、Sen Liu、Xiao-Xin Yan、Mengchao Cui
DOI:10.1021/acs.analchem.2c02532
日期:2022.11.8
Lewy pathologies, which mainly consist of insoluble α-synuclein (α-syn) aggregates, are the hallmarks of Parkinson’s disease and many other neurodegenerative diseases termed “synucleinopathies”. Detection of Lewy pathologies with optical methods is of interest for preclinical studies, while the α-syn fluorescent probe is still in great demand. By rational design, we obtained a series of D-π-A-based trisubstituted alkenes with acceptable optical properties and high binding affinities to α-syn fibrils. Among these probes, FPQXN and TQXN-2 exhibited high binding affinities (6 and 8 nM, respectively), significant fluorescence enhancements (17.2- and 26.6-fold, respectively), and satisfying quantum yields (36.5% and 10.4%, respectively), which met the need for the in vitro neuropathological staining of Lewy pathologies in the PD brain sections. In addition, TQXN-2 showed great potential in fluorescent discrimination of Lewy pathologies and Aβ plaques. Our research provides flexible tools for in vitro detection of α-syn aggregates and offers new structural frameworks for the further development of α-syn fluorescent probes.
路易病变主要由不溶性α-突触核蛋白(α-syn)聚集体组成,是帕金森病和其他许多被称为 "突触核蛋白病 "的神经退行性疾病的特征。用光学方法检测路易病变是临床前研究的兴趣所在,而 α-syn 荧光探针仍有很大的需求。通过合理设计,我们获得了一系列基于 D-π-A 的三取代烯类探针,这些探针具有可接受的光学特性以及与 α-syn 纤维的高结合亲和力。在这些探针中,FPQXN和TQXN-2具有较高的结合亲和力(分别为6 nM和8 nM)、显著的荧光增强(分别为17.2倍和26.6倍)以及令人满意的量子产率(分别为36.5%和10.4%),可满足对帕金森病脑切片中路易病变进行体外神经病理学染色的需要。此外,TQXN-2 在路易病变和 Aβ 斑块的荧光鉴别方面也表现出了巨大的潜力。我们的研究为体外检测α-syn聚集体提供了灵活的工具,并为进一步开发α-syn荧光探针提供了新的结构框架。