Enhanced arecoline derivatives as muscarinic acetylcholine receptor M1 ligands for potential application as PET radiotracers
作者:Marius Ozenil、Katharina Pacher、Theresa Balber、Chrysoula Vraka、Alexander Roller、Wolfgang Holzer、Helmut Spreitzer、Markus Mitterhauser、Wolfgang Wadsak、Marcus Hacker、Verena Pichler
DOI:10.1016/j.ejmech.2020.112623
日期:2020.10
. Five arecoline derivatives and arecoline were labeled with carbon-11 in good yields. Arecaidine diphenylmethyl ester (3b), arecaidine bis(4-fluorophenyl)methyl ester (3c) and arecaidine (4-bromophenyl)(4-fluorophenyl)methyl ester (3e) showed a tremendous gain in mAChR affinity compared to arecoline and a pronounced subtype selectivity for M1. Metabolic stability and serum protein binding of [11C]3b
毒蕈碱乙酰胆碱受体(mAChRs)参与了许多神经退行性疾病的支持,是PET成像的一个有趣目标。然而,在临床常规中没有建立放射性示踪剂。在这项工作中,我们旨在开发基于槟榔碱结构的新型PET示踪剂。合成,表征和测试了十五种新型槟榔碱衍生物与mAChRs M1-M5和可能的脱靶乙酰胆碱酯酶的亲和力。五种槟榔碱衍生物和槟榔碱被高碳11标记。槟榔碱二苯甲基酯(3b),槟榔碱双(4-氟苯基)甲酯(3c)和槟榔碱(4-溴苯基)(4-氟苯基)甲基酯(3e))与槟榔碱相比在mAChR亲和力方面显示出巨大的增长,并且对M1具有明显的亚型选择性。[ 11 C] 3b和[ 11 C] 3c的代谢稳定性和血清蛋白结合与已建立的脑示踪剂的性质一致。[ 11 C] 3c的非特异性结合在活细胞的动力学和终点实验以及天然小鼠大脑切片的放射自显影中普遍存在,这促使我们在体内实验之前降低该物质类别的亲脂性。