Development of 18F-Labeled Radiotracers for PET Imaging of the Adenosine A2A Receptor: Synthesis, Radiolabeling and Preliminary Biological Evaluation
作者:Thu Hang Lai、Susann Schröder、Magali Toussaint、Sladjana Dukić-Stefanović、Mathias Kranz、Friedrich-Alexander Ludwig、Steffen Fischer、Jörg Steinbach、Winnie Deuther-Conrad、Peter Brust、Rareş-Petru Moldovan
DOI:10.3390/ijms22052285
日期:——
metabolic stability of [18F]PPY1 and [18F]PPY2 in CD-1 mice by radio-HPLC analysis revealed parent fractions of more than 76% of total activity in the brain. Specific binding of [18F]PPY2 on mice brain slices was demonstrated by in vitro autoradiography. In vivo PET/magnetic resonance imaging (MRI) studies in CD-1 mice revealed a reasonable high initial brain uptake for both radiotracers, followed by a fast
腺苷A 2A受体(A 2A R)代表神经退行性疾病的潜在治疗靶标。为了开发正电子发射断层扫描(PET)示踪剂以监测A 2A R量身定制的治疗过程中受体密度和/或占有率的变化,我们基于最近发表的铅化合物(PPY)设计了一个氟化类似物库。其中,高亲和力的4-氟苄基衍生物(PPY1 ; K i(h A 2A R)= 5.3 nM)和2-氟苄基衍生物(PPY2 ; K i(h A 2A)从相应的硼酸频哪醇酯前体开始,通过醇增强的铜介导的方法,选择R)= 2.1 nM)进行18 F标记。的代谢稳定性的研究[ 18 F] PPY 1和[18 F] PPY2在通过放射性HPLC分析CD-1小鼠显示在脑的总活性的76%以上父级分。通过体外放射自显影证实了[ 18 F] PPY 2在小鼠脑片上的特异性结合。在CD-1小鼠中进行的体内PET /磁共振成像(MRI)研究表明,两种放射性示踪剂的初始脑摄取量均较高,然后快速清除。