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18F-Labeled Benzyldiamine Derivatives as Novel Flexible Probes for Positron Emission Tomography of Cerebral β-Amyloid Plaques
Journal of Medicinal Chemistry ( IF 6.8 ) Pub Date : 2016-11-29 00:00:00 , DOI: 10.1021/acs.jmedchem.6b01063
Zijing Li 1 , Xuran Zhang 1, 2 , Xiaoyang Zhang 2 , Mengchao Cui 2 , Jie Lu 2 , Xiaodong Pan 3, 4 , Xianzhong Zhang 1
Affiliation  

Early noninvasive visualization of cerebral β-amyloid (Aβ) plaques with positron emission tomography (PET) is the most feasible way to diagnose Alzheimer’s disease (AD). In this study, a series of flexible benzyldiamine derivatives (BDA) were proposed for binding to aggregated β-amyloid 1–42 (Aβ1–42) with high adaptability, high binding affinity (6.8 ± 0.6 nM), and rapid body excretion. The methylthio (12) and ethoxyl (10) derivatives were further labeled with 18F directly on their benzene ring and examined as PET probes for Aβ plaque imaging. [18F]12 displayed 4.87 ± 0.52% ID/g initial uptake and prompt washout from normal brain in biodistribution studies. MicroPET-CT imaging indicated sufficient retention of [18F]12 but lower white matter uptake in the brain of an AD transgenic mouse model compared with that of commercial [18F]AV-45. Our experimental results provide new insights for developing targeting ligands possessing a flexible framework for use as efficient Aβ probes for PET imaging of AD brain.

中文翻译:

18 F标签的苄基二胺衍生物作为脑β-淀粉样蛋白斑正电子发射断层成像的新型柔性探针

通过正电子发射断层扫描(PET)对脑β-淀粉样蛋白(Aβ)斑块进行早期无创可视化是诊断阿尔茨海默氏病(AD)的最可行方法。在这项研究中,提出了一系列柔性苄基二胺衍生物(BDA),以高适应性,高结合亲和力(6.8±0.6 nM)和快速排泄的方式与聚集的β-淀粉样蛋白1-42(Aβ1–42)结合。进一步在其苯环上直接用18 F标记甲硫基(12)和乙氧基(10)衍生物,并作为Aβ斑块成像的PET探针进行检查。[ 18楼] 12在生物分布研究中显示出4.87±0.52%ID / g的初始摄取和正常大脑的即时冲洗。MicroPET-CT成像表明,与商用[ 18 F] AV-45相比,AD转基因小鼠模型的[ 18 F] 12具有足够的保留能力,但在大脑中的白质摄取较低。我们的实验结果为开发具有灵活框架的靶向配体提供了新的见识,该框架可用作AD脑PET成像的有效Aβ探针。
更新日期:2016-11-29
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