Evaluation of (64)Cu-Based Radiopharmaceuticals that Target Aβ Peptide Aggregates as Diagnostic Tools for Alzheimer's Disease.

Evaluation of (64)Cu-Based Radiopharmaceuticals that Target Aβ Peptide Aggregates as Diagnostic Tools for Alzheimer's Disease.
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DOI:
10.1021/jacs.7b05937
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发表时间:
2017-09-13
影响因子:
15
通讯作者:
Mirica LM
Mirica LM
中科院分区:
化学1区
文献类型:
--
作者:
Bandara N;Sharma AK;Krieger S;Schultz JW;Han BH;Rogers BE;Mirica LM

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正电子发射断层扫描(PET)成像剂,检测淀粉样蛋白斑块含有淀粉样蛋白β(Aβ)肽聚集体在阿尔茨海默病(AD)患者的大脑已被成功开发,并在最近由FDA批准用于临床使用。然而,目前使用的放射性核素11 C(20.4分钟)和18F(109.8分钟)的短半衰期可能限制这些显像剂的广泛使用。因此,我们已经开始评估新的AD诊断剂,可以用64 Cu放射性标记,64 Cu是一种半衰期为12.7小时的放射性核素,是PET成像的理想选择。本文描述了一系列双功能螯合剂(BFC),L1-L5,其被设计为紧密结合64 Cu,并显示在体外和转基因AD小鼠脑切片中与Aβ聚集体相互作用。重要的是,生物分布研究表明,这些化合物在野生型小鼠中表现出有希望的脑摄取和快速清除,并且转基因AD小鼠的初始microPET成像研究表明,这些化合物可以作为开发改进的AD诊断剂的先导化合物。
Positron emission tomography (PET) imaging agents that detect amyloid plaques containing amyloid beta (Aβ) peptide aggregates in the brain of Alzheimer’s disease (AD) patients have been successfully developed and recently approved by the FDA for clinical use. However, the short half-lives of the currently used radionuclides 11C (20.4 min) and 18F (109.8 min) may limit the widespread use of these imaging agents. Therefore, we have begun to evaluate novel AD diagnostic agents that can be radiolabeled with 64Cu, a radionuclide with a half-life of 12.7 h, ideal for PET imaging. Described herein are a series of bifunctional chelators (BFCs), L1–L5, that were designed to tightly bind 64Cu and shown to interact with Aβ aggregates both in vitro and in transgenic AD mouse brain sections. Importantly, biodistribution studies show that these compounds exhibit promising brain uptake and rapid clearance in wild-type mice, and initial microPET imaging studies of transgenic AD mice suggest that these compounds could serve as lead compounds for the development of improved diagnostic agents for AD.
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