Probes which target diffuse and fibrillar forms of amyloid beta (Aβ) are described. These probes demonstrate high initial brain penetration and facile clearance from non-targeted regions. The agents can be used to image amyloid quantitatively for monitoring efficacy of Aβ-modifying therapeutics and assist in premortem diagnosis of Alzheimer's disease (AD). Disclosed probes can bind Aβ aggregates of preformed Aβ1-42 fibrils in vitro and can be used to image fibrillar and diffuse plaques ex vivo in brain sections. Disclosed probes can be used to determine Aβ burden in early stages of AD. These probes can be used for multimodality imaging of Aβ. F-AI-187 (1 μM) can detect Aβ plaques in brain sections of APP/PS1 mice. F-AI-187 (10 μM) can detect Aβ plaques in the frontal lobe in a brain section of a patient with confirmed AD. Some probes can be used for fluorescence imaging of plaque.
本文介绍了针对淀粉样β(Aβ)弥散和纤维形式的探针。这些探针显示出较高的初始脑穿透性,并能从非靶向区域轻松清除。这些制剂可用于对淀粉样蛋白进行定量成像,以监测 Aβ 改性疗法的疗效,并有助于阿尔茨海默病(AD)的死前诊断。所公开的探针可在体外结合预形成的 Aβ1-42 纤维的 Aβ 聚集体,并可用于在体外对脑切片中的纤维斑块和弥漫斑块进行成像。所公开的探针可用于确定 AD 早期阶段的 Aβ 负担。这些探针可用于 Aβ 的多模态成像。F-AI-187(1 μM)可检测APP/PS1小鼠脑切片中的Aβ斑块。F-AI-187(10 μM)可检测确诊为注意力缺失症患者大脑切片中额叶的 Aβ 斑块。有些探针可用于斑块的
荧光成像。