Transferrin conjugates of triazacyclononane-based bifunctional NE3TA chelates for PET imaging: Synthesis, Cu-64 radiolabeling, and in vitro and in vivo evaluation
作者:Chi Soo Kang、Ningjie Wu、Yunwei Chen、Xiang Sun、Nilantha Bandara、Dijie Liu、Michael R. Lewis、Buck E. Rogers、Hyun-Soon Chong
DOI:10.1016/j.jinorgbio.2015.10.012
日期:2016.1
Three different polyaminocarboxylate-based bifunctional NE3TA (7-[2-[carboxymethyl)amino]ethyl]-1,4,7-triazacyclononane-1,4-diacetic acid) chelating agents were synthesized for potential use in copper 64-PET imaging applications. The bifunctional chelates were comparatively evaluated using transferrin (Tf) as a model targeting vector that binds to the transferrin receptor overexpressed in many different
合成了三种不同的基于聚氨基羧酸盐的双功能NE3TA(7- [2- [羧甲基]氨基]乙基] -1,4,7-三氮杂环壬烷-1,4-二乙酸)螯合剂,可用于铜64-PET成像应用。使用运铁蛋白(Tf)作为模型靶向载体与在许多不同癌细胞中过表达的运铁蛋白受体结合,对双功能螯合物进行了比较评估。评估了基于NE3TA的双功能螯合物的运铁蛋白缀合物对64 Cu的放射性标记。分别在人血清和前列腺癌(PC-3)癌细胞中评估了64种Cu-放射性标记的偶联物的体外稳定性和细胞摄取。在测试的三种NE3TA–Tf共轭物中,N-NE3TA–Tf被确定为64 Cu放射性标记的最佳结合物。N -NE3TA–Tf快速结合到64 Cu(> 98%的放射性标记效率,1分钟,RT),并且64 Cu – N -NE3TA–Tf在人血清中保持稳定2天,并显示出PC-3癌细胞的高摄取。 。结果显示,在24小时内,携带PC-3肿瘤的小鼠体内64