We report the synthesis and biological evaluation of novel (E)-5-styryl-1H-indole and (E)-6-styrylquinoline derivatives as probes for imaging β-amyloid (Aβ) plaques. These derivatives showed binding affinities for Aβ1–40 aggregates with Ki values varying from 4.1 to 288.4 nM. (E)-5-(4-iodostyryl)-1H-indole (8) clearly stained Aβ plaques in the brain sections of Alzheimer’s disease (AD) model mice (APP/PS1). Furthermore, autoradiography for [125I]8 displayed intense and specific labeling of Aβ plaques in the brain sections mentioned above with low background. In biodistribution experiments using normal mice [125I]8 showed high initial brain uptake followed by rapid washout (4.27 and 0.64% ID/g at 2 and 30 min post injection, respectively). These findings suggests that [123I]8 may be a potential SPECT imaging agent for detecting Aβ plaques in AD brain.
我们报告了新型(E)-5-
苯乙烯基-1H-
吲哚和(E)-6-
苯乙烯基
喹啉衍
生物的合成及其对β-淀粉样蛋白(Aβ)斑块的
生物学评价作为成像探针。这些衍
生物对Aβ1-40聚集体显示出结合亲和力,其Ki值在4.1至288.4 nM之间变化。(E)-5-(4-
碘苯乙烯基)-1H-
吲哚(8)明显染色了阿尔茨海默病(AD)模型小鼠(APP/PS1)脑切片的Aβ斑块。此外,[125I]8的自显影显示上述脑切片的Aβ斑块具有强烈且特异的标记,背景较低。在正常小鼠的
生物分布实验中,[125I]8显示出高初始脑摄取量后迅速洗出(分别在注射后2分钟和30分钟为4.27%和0.64%ID/g)。这些发现表明[123I]8可能是一种用于检测AD脑中Aβ斑块的潜在
SPECT成像剂。