Novel Kappa Opioid Receptor Agonist as Improved PET Radiotracer: Development and in Vivo Evaluation
作者:Songye Li、Ming-Qiang Zheng、Mika Naganawa、Hong Gao、Richard Pracitto、Anupama Shirali、Shu-fei Lin、Jo-Ku Teng、Jim Ropchan、Yiyun Huang
DOI:10.1021/acs.molpharmaceut.8b01209
日期:2019.4.1
specificity and selectivity. Metabolite-corrected arterial activities over time were measured and used as input functions to analyze the brain regional time-activity curves and derive kinetic and binding parameters with kinetic modeling. FEKAP displayed high KOR binding affinity ( Ki = 0.43 nM) and selectivity (17-fold over mu opioid receptor and 323-fold over delta opioid receptor) in vitro. 11C-FEKAP
κ阿片受体(KOR)与抑郁症,酒精中毒和药物滥用有关。当前的激动剂放射性示踪剂11C-GR103545由于其在人体中的缓慢的组织动力学,因此不适合用于对KOR成像。我们项目的目的是开发具有改进成像性能的新型KOR激动剂放射性示踪剂。设计,合成了新型化合物FEKAP(((R))-4-(2-(3,4-二氯苯基)乙酰基)-3-((乙基(2-氟乙基)氨基)甲基)哌嗪-1-甲酸) ,并进行体外结合亲和力测定。然后对其进行放射性标记并在恒河猴中进行评估。在Focus-220扫描仪上进行基线和阻断扫描,以评估结合特异性和选择性。测量随时间变化的代谢物校正的动脉活动,并将其用作输入功能,以分析大脑区域的时间活动曲线,并通过动力学建模得出动力学和结合参数。FEKAP在体外显示出高的KOR结合亲和力(Ki = 0.43 nM)和选择性(比μ阿片受体高17倍,比δ阿片受体高323倍)。制备的11C-FEKAP具有较高的摩尔活度(平均值为718