[18F]FEPPA a TSPO Radioligand: Optimized Radiosynthesis and Evaluation as a PET Radiotracer for Brain Inflammation in a Peripheral LPS-Injected Mouse Model
作者:Nicolas Vignal、Salvatore Cisternino、Nathalie Rizzo-Padoin、Carine San、Fortune Hontonnou、Thibaut Gelé、Xavier Declèves、Laure Sarda-Mantel、Benoît Hosten
DOI:10.3390/molecules23061375
日期:——
[18F]FEPPA was synthesized by nucleophilic substitution (90 °C, 10 min) with tosylated precursor, followed by improved semi-preparative HPLC purification (retention time 14 min). [18F]FEPPA radiosynthesis were carried out in 55 min (from EOB). The non-decay corrected radiochemical yield were 34 ± 2% (n = 17), and the radiochemical purity greater than 99%, with a molar activity of 198 ± 125 GBq/µmol at the
[18F]FEPPA 是 18 kDa 易位蛋白 (TSPO) 的特异性配体,用作神经胶质激活和神经炎症的正电子发射断层扫描 (PET) 生物标志物。[18F]FEPPA 放射合成经过优化,可在小鼠模型中评估在 PET 成像前 24 小时腹膜内注射肠道沙门氏菌血清型鼠伤寒杆菌脂多糖 (LPS;5 mg/kg) 诱发的脑炎症。[18F]FEPPA 是通过用甲苯磺酸化前体进行亲核取代(90°C,10 分钟)合成的,然后是改进的半制备型 HPLC 纯化(保留时间 14 分钟)。[18F]FEPPA 放射合成在 55 分钟内进行(来自 EOB)。未衰减校正的放射化学产率为 34 ± 2% (n = 17),放射化学纯度大于 99%,合成结束时的摩尔活性为 198 ± 125 GBq/µmol。蛋白质印迹分析表明,与对照相比,LPS 治疗的小鼠中 TSPO 脑表达增加了 2.2 倍。这与使用药代动力学模型估计的