Synthesis, Structure–Activity Relationships, Radiofluorination, and Biological Evaluation of [<sup>18</sup>F]RM365, a Novel Radioligand for Imaging the Human Cannabinoid Receptor Type 2 (CB2R) in the Brain with PET
作者:Rodrigo Teodoro、Daniel Gündel、Winnie Deuther-Conrad、Aleksandr Kazimir、Magali Toussaint、Barbara Wenzel、Guy Bormans、Evamarie Hey-Hawkins、Klaus Kopka、Peter Brust、Rareş-Petru Moldovan
DOI:10.1021/acs.jmedchem.3c01035
日期:2023.10.26
The development of cannabinoid receptor type 2 (CB2R) PET radioligands has been intensively explored due to the pronounced CB2R upregulation under various pathological conditions. Herein, we report on the synthesis of a series of CB2R affine fluorinated indole-2-carboxamide ligands. Compound RM365 was selected for PET radiotracer development due to its high CB2R affinity (Ki = 2.1 nM) and selectivity
由于各种病理条件下 CB2R 显着上调,2 型大麻素受体 (CB2R) PET 放射性配体的开发已得到深入探索。在此,我们报道了一系列 CB2R 仿射氟化吲哚-2-甲酰胺配体的合成。化合物 RM365 因其高 CB2R 亲和力 ( K i = 2.1 nM) 和相对于 CB1R 的选择性(因子 > 300)而被选用于 PET 放射性示踪剂开发。[ 18 F]RM365 的初步体外评估表明与 CB2R 的结合存在物种差异(hCB2R 的K D为 2.32 nM,而rCB2R 的K D > 10,000 nM)。小鼠代谢研究表明 [ 18 F]RM365具有较高的体内稳定性。在大脑局部 hCB2R(D80N) 过度表达的大鼠模型中进行 PET 成像,证明 [ 18 F]RM365 能够以高信号背景比到达并选择性标记 hCB2R(D80N)。因此,[ 18 F]RM365 是一种非常有前途的 PET