Synthesis and evaluation of 2-pyrrolopyridinylquinoline derivatives as selective tau PET tracers for the diagnosis of Alzheimer's disease
作者:Pradith Lerdsirisuk、Ryuichi Harada、Yoshimi Hayakawa、Yuki Shimizu、Yoichi Ishikawa、Ren Iwata、Yukitsuka Kudo、Nobuyuki Okamura、Shozo Furumoto
DOI:10.1016/j.nucmedbio.2020.10.002
日期:2021.2
respectively). The radiosynthesis of [18F]PPQ8 and [18F]PPQ9 yielded 1.4% and 50.1% isolated non-decay corrected radiochemical yield, respectively, with >99% radiochemical purity. The molar radioactivities of [18F]PPQ8 and [18F]PPQ9 were 16.9 and 64.8 GBq/μmol, respectively. The in vitro and ex vivo biological characterization of [18F]PPQ8 and [18F]PPQ9 revealed that these tracers were selective for tau in AD brain
介绍 [ 18 F]THK-5351 最初是作为正电子发射断层扫描 (PET) 成像示踪剂开发的,用于检测积累的 tau 蛋白,这是阿尔茨海默病 (AD) 的病理标志。然而,[ 18 F]THK-5351 的临床研究表明存在与单胺氧化酶-B (MAO-B) 的脱靶结合。为了克服这种脱靶结合,在这项工作中,我们合成并评估了 2-吡咯并吡啶基喹啉 (PPQ) 衍生物作为选择性 tau PET 成像示踪剂。 方法 PPQ衍生物的核心结构主要使用Buchwald-Hartwig胺化偶联反应合成。通过体外竞争性结合测定评估所有衍生物对 tau 和 MAO-B 的结合亲和力。PPQ 衍生物的放射合成是通过在二甲基亚砜中用活化的 [ 18 F]KF/Kryptofix222 复合物在 110 °C 下加热 10 分钟对其甲苯磺酸盐前体进行18 F-放射性标记来进行的。这些[ 18 F]PPQ 衍生物的生物学特性通过死后