Structure–Activity Relationship Studies of Pyridine-Based Ligands and Identification of a Fluorinated Derivative for Positron Emission Tomography Imaging of Cannabinoid Type 2 Receptors
作者:Ahmed Haider、Julian Kretz、Luca Gobbi、Hazem Ahmed、Kenneth Atz、Markus Bürkler、Christian Bartelmus、Jürgen Fingerle、Wolfgang Guba、Christoph Ullmer、Michael Honer、Irene Knuesel、Markus Weber、Andreas Brink、Adrienne Müller Herde、Claudia Keller、Roger Schibli、Linjing Mu、Uwe Grether、Simon M. Ametamey
DOI:10.1021/acs.jmedchem.9b01280
日期:2019.12.26
selectivity factor of nearly 700 over cannabinoid type 1 receptors, target compound 3 exhibited optimal in vitro properties and was selected for evaluation as a PET radioligand. [18F]3 was obtained in an average radiochemical yield of 11 ± 4% and molar activities between 33 and 114 GBq/μmol. Specific binding of [18F]3 to CB2 was demonstrated by in vitro autoradiography and in vivo PET experiments using the
大麻素2型(CB2)受体已成为治疗和免疫介导的病理学成像的重要靶标。为了找到先前报道的CB2正电子发射断层扫描(PET)放射性配体[11C] RSR-056的合适的放射性氟化类似物,合成了38种氟化衍生物,并通过体外结合试验进行了测试。与大麻素1型受体相比,Ki(hCB2)为6 nM,选择性因子接近700,目标化合物3表现出最佳的体外特性,因此被选作PET放射性配体进行评估。[18F] 3的平均放射化学产率为11±4%,摩尔活性为33至114 GBq /μmol。[18F] 3与CB2的特异性结合通过使用CB2配体GW-405 833的体外放射自显影和体内PET实验得到证明。代谢物分析显示,大鼠脑中仅完整的[18F] 3。[18F] 3在人类肌萎缩性侧索硬化症脊髓组织中检测到CB2上调,因此可能成为人类诊断用途的候选者。