Development of a New Thiol Site-Specific Prosthetic Group and Its Conjugation with [Cys<sup>40</sup>]-exendin-4 for in Vivo Targeting of Insulinomas
作者:Xuyi Yue、Dale O. Kiesewetter、Jinxia Guo、Zhongchan Sun、Xiaoxiang Zhang、Lei Zhu、Gang Niu、Ying Ma、Lixin Lang、Xiaoyuan Chen
DOI:10.1021/bc400084u
日期:2013.7.17
activity of 20–49 GBq/μmol. [18F]FPenM showed comparable labeling efficiency with N-[2-(4-[18F]fluorobenzamido)ethyl]maleimide ([18F]FBEM). Its application was demonstrated by conjugation with glucagon-like peptide type 1 (GLP-1) analogue [cys40]-exendin-4. The cell uptake, binding affinity, imaging properties, biodistribution, and metabolic stability of the radiolabeled [18F]FPenM-[cys40]-exendin-4 were
开发了一种新的示踪剂N -5-[ 18 F] 氟戊基马来酰亚胺([ 18 F] FPenM),用于蛋白质和肽中游离硫醇基团的位点特异性标记。示踪剂分三步合成(脂肪族甲苯磺酸酯的18 F 置换,通过 TFA 去除 di-Boc 以暴露游离胺,以及将游离胺掺入马来酰亚胺中)。放射合成在 110 分钟内完成,放射化学产率为 11-17%(未校正),比活为 20-49 GBq/μmol。[ 18 F]FPenM显示出与N- [2-(4-[ 18 F]氟苯甲酰胺基)乙基]马来酰亚胺([ 18F]FBEM)。它的应用通过与胰高血糖素样肽 1 (GLP-1) 类似物 [cys 40 ]-exendin-4的结合得到证实。使用 INS-1 肿瘤细胞和 INS-1 异种移植模型研究了放射性标记的 [ 18 F]FPenM-[cys 40 ]-exendin-4的细胞摄取、结合亲和力、成像特性、生物分布和代谢稳定性。正电子发射断层扫描