Pharmacological Characterization of Low-to-Moderate Affinity Opioid Receptor Agonists and Brain Imaging with<sup>18</sup>F-Labeled Derivatives in Rats
作者:Julian Ott、Mona M. Spilhaug、Simone Maschauer、Waqas Rafique、Jimmy E. Jakobsson、Karoline Hartvig、Harald Hübner、Peter Gmeiner、Olaf Prante、Patrick J. Riss
DOI:10.1021/acs.jmedchem.0c00683
日期:2020.9.10
nM) were subjected to 18F-fluorination, autoradiography, and small-animal PET imaging. Radioligands [18F]3b and [18F]3e were obtained in activity yields of 21 ± 5 and 23 ± 4% and molar activities of 25–40 and 200–300 GBq/μmol, respectively. Displaceable binding matching MOR distribution in the brain was confirmed by imaging. Radioligands showed a rapid pharmacokinetic profile; however, metabolite-corrected
研究了3,4-二氯-N-(1-(二甲基氨基)环己基)甲基苯甲酰胺支架,作为18 F-正电子发射断层显像(18 F-PET)放射性示踪剂开发的模板,强调了对阿片受体(OR)变化的敏感性高亲和力。研究了15种候选药物的激动剂效价,结合亲和力和相关药理参数。对两种有希望的具有中度范围(EC 50 = 1–100 nM)的μ-OR(MOR)选择性激动剂活性的化合物3b和3e进行18 F氟化,放射自显影和小动物PET成像。放射性配体[ 18 F] 3b和[ 18F] 3e的活性产率分别为21±5和23±4%,摩尔活性分别为25–40和200–300 GBq /μmol。通过成像证实了与大脑中的MOR分布匹配的可置换结合。放射性配体表现出快速的药代动力学特征。但是,数据分析需要经过代谢物校正的基于血液的建模。观察到的BP ND低,尽管用纳洛酮治疗导致特异性结合显着降低,这证实了18 F标记的OR激动剂PET配体的新模板的发现。