The development of an automated and GMP compliant FASTlab™ Synthesis of [<sup>18</sup>F]GE-180; a radiotracer for imaging translocator protein (TSPO)
作者:Torild Wickstrøm、Alan Clarke、Ingvil Gausemel、Eric Horn、Karina Jørgensen、Imtiaz Khan、Dimitrios Mantzilas、Thanushan Rajanayagam、Dirk-Jan In 't Veld、William Trigg
DOI:10.1002/jlcr.3112
日期:2014.1
The level of the translocator protein (TSPO) increases dramatically in microglial cells when the cells are activated in response to neuronal injury and insult. The radiotracer [18F]GE-180 binds selectively and with high affinity to TSPO and can therefore be used to measure neuroinflammation in a variety of disease states. An optimized, automated synthesis of [18F]GE-180 has been developed for the GE FASTlab™ synthesizer. The entire process takes place on the single-use cassette. The radiolabelling is performed by nucleophilic fluorination of the S- enantiomer mesylate precursor. The crude product is purified post-radiolabelling using two solid-phase extraction cartridges integrated on the cassette. Experimental design and multivariate data analysis were used to assess the robustness, and critical steps were optimized with respect to efficacy and quality. The average radiochemical yield is 48% (RSD 6%, non-decay corrected), and the synthesis time including purification is approximately 43 min. The radiochemical purity is ≥95% for radioactive concentration ≤1100 MBq/mL. The total amount of precursor-related chemical impurities is 1–2 µg/mL. The use of solid-phase extraction purification results in a robust GMP compliant process with a product of high chemical and radiochemical purity and consistent performance across positron emission tomography (PET) centers.
当小胶质细胞因神经元损伤和侮辱而被激活时,小胶质细胞中转运蛋白(TSPO)的水平会急剧升高。放射性示踪剂[18F]GE-180可选择性地与TSPO高亲和力结合,因此可用于测量各种疾病状态下的神经炎症。 我们为 GE FASTlab™ 合成器开发了一种优化的[18F]GE-180 自动合成方法。整个过程在一次性使用盒上进行。通过对 S-对映体甲磺酸盐前体进行亲核氟化来进行放射性标记。放射性标记后的粗产品使用集成在盒上的两个固相萃取柱进行纯化。实验设计和多元数据分析用于评估稳健性,并对关键步骤的功效和质量进行了优化。 平均放射化学收率为 48%(RSD 为 6%,无衰变校正),包括纯化在内的合成时间约为 43 分钟。放射性浓度≤1100 MBq/mL时,放射化学纯度≥95%。前体相关化学杂质的总量为 1-2 µg/mL。 采用固相萃取纯化技术可实现符合 GMP 标准的稳健工艺,产品具有很高的化学和放射化学纯度,在各正电子发射断层扫描(PET)中心具有一致的性能。