While Alzheimer's Disease (AD) is the most common neurodegenerative disease, there is still a dearth of efficient therapeutic and diagnostic agents for this disorder. Reported herein are a series of new multifunctional compounds (MFCs) with appreciable affinity for amyloid aggregates that can be potentially used for both the modulation of Aβ aggregation and its toxicity, as well as positron emission tomography (PET) imaging of Aβ aggregates. Firstly, among the six compounds tested HYR-16 is shown to be capable to reroute the toxic Cu-mediated Aβ oligomerization into the formation of less toxic amyloid fibrils. In addition, HYR-16 can also alleviate the formation of reactive oxygen species (ROS) caused by Cu²⁺ ions through Fenton-like reactions. Secondly, these MFCs can be easily converted to PET imaging agents by pre-chelation with the ⁶⁴Cu radioisotope, and the Cu complexes of HYR-4 and HYR-17 exhibit good fluorescent staining and radiolabeling of amyloid plaques both in vitro and ex vivo. Importantly, the ⁶⁴Cu-labeled HYR-17 is shown to have a significant brain uptake of up to 0.99 ± 0.04 %ID per g. Overall, by evaluating the various properties of these MFCs valuable structure–activity relationships were obtained that should aid the design of improved therapeutic and diagnostic agents for AD.

中文翻译：

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用于调节和 64Cu PET 成像的 Aβ 聚集的金属螯合苯并噻唑多功能化合物

虽然阿尔茨海默病 (AD) 是最常见的神经退行性疾病，但仍然缺乏针对这种疾病的有效治疗和诊断药物。本文报道了一系列新的多功能化合物 (MFC)，它们对淀粉样蛋白聚集体具有明显的亲和力，可用于调节 Aβ 聚集及其毒性，以及 Aβ 聚集体的正电子发射断层扫描 (PET) 成像。首先，在所测试的六种化合物中，HYR-16被证明能够将有毒的 Cu 介导的 Aβ 寡聚化重新路由为毒性较小的淀粉样蛋白原纤维的形成。此外，HYR-16还可以缓解由Cu ²⁺引起的活性氧（ROS）的形成。离子通过类芬顿反应。^{其次，通过与64} Cu 放射性同位素的预螯合，这些 MFC 可以很容易地转化为 PET 显像剂，并且HYR-4和HYR-17的 Cu 配合物在体外和离体都表现出良好的淀粉样斑块的荧光染色和放射性标记。重要的是，⁶⁴ Cu 标记的HYR-17被证明具有高达 0.99 ± 0.04 %ID/g 的显着脑摄取。总体而言，通过评估这些 MFC 的各种特性，获得了有价值的构效关系，这将有助于设计改进的 AD 治疗和诊断试剂。