Synthesis and in vitro evaluation of three novel radiotracers for imaging of metabotropic glutamate receptor subtype 2 in rat brain
作者:Katsushi Kumata、Tomoteru Yamasaki、Akiko Hatori、Yiding Zhang、Wakana Mori、Masayuki Fujinaga、Lin Xie、Takayuki Okubo、Nobuki Nengaki、Ming-Rong Zhang
DOI:10.1016/j.bmcl.2017.05.029
日期:2017.7
new radiotracers, 1-(cyclopropylmethyl)-4-([11C/18F]substituted-phenyl)piperidin-1-yl-2-oxo-1,2-dihydropyridine-3-carbonitrile ([11C]1, [11C]2, and [18F]4), and to examine their specific bindings with metabotropic glutamate receptor subtype 2 (mGluR2) in rat brain sections by using in vitro autoradiography. These compounds were found to possess potent in vitro binding affinities (Ki: 8.0–34.1 nM) for
这项研究的目的是开发三种新的放射性示踪剂,1-(环丙基甲基)-4-([[ 11 C / 18 F]取代的苯基)哌啶-1-基-2-氧-2-1,2-二氢吡啶-3-碳腈([ 11 C] 1,[ 11 C] 2和[ 18 F] 4),并使用体外放射自显影法检查它们在大鼠脑切片中与代谢型谷氨酸受体亚型2(mGluR2)的特异性结合。发现这些化合物对大鼠脑匀浆中的mGluR2具有有效的体外结合亲和力(K i:8.0-34.1 nM)。[ 11 C] 1,[ 11 C] 2,和[ 18 F] 4通过相应的苯酚前体的[ 11 C / 18 F]烷基化与[ 11 C]甲基碘或[ 18 F]氟乙基溴化物进行化学合成,其化学纯度> 98%,且80-130 GBq /μmol合成结束时的比活。体外放射自显影显示这些放射性示踪剂在富含mGluR2的大脑区域(例如大脑皮层,纹状体,海马和小脑颗粒层)中显示出异质特异性结合。