Synthesis and biological evaluation of<sup>99m</sup>Tc(CO)<sub>3</sub>(IDA-CPT) for tumor imaging
作者:Jianjun Wang、Tingting Niu、Jing Yang、Cunmin Tan、Xiaobei Zheng、Wangsuo Wu、Feng Dong、Hongyun Guo
DOI:10.1002/jlcr.1690
日期:——
This work reports the synthesis, radiolabeling, and preliminary biodistribution results in tumor-bearing mice of 99mTc(CO)3(IDA-CPT). The novel camptothecin (CPT) derivate was successfully synthesized by conjugation of iminodiacetic acid (IDA) to camptothecin via a short carbonyl-methylene linker. Radiolabeling was performed in high yield with [99mTc(CO)3]+ core to get 99mTc(CO)3(IDA-CPT), which was hydrophilic and stable at room temperature. Biodistribution studies in tumor-bearing mice showed that 99mTc(CO)3(IDA-CPT) accumulated in the tumor with good uptake and retention. However, its clearance from normal organs was slow, resulting in poor T/NT ratios. Further modification on the linker or/and 99mTc-chelate to improve the tumor-targeting efficacy and in vivo kinetic profiles is currently in progress. Copyright © 2009 John Wiley & Sons, Ltd.
本研究报告了99m锝(CO)3(IDA-CPT)的合成、放射性标记以及在肿瘤小鼠体内的初步生物分布结果。这种新型喜树碱(CPT)衍生物是通过亚氨基二乙酸(IDA)与喜树碱通过短羰基-亚甲基连接体共轭而成功合成的。用[99mTc(CO)3]+核进行放射性标记可获得99mTc(CO)3(IDA-CPT),该衍生物亲水性好,室温下稳定。在肿瘤小鼠体内进行的生物分布研究表明,99m锝(CO)3(IDA-CPT)在肿瘤内蓄积,具有良好的摄取和保留能力。然而,它从正常器官中清除的速度较慢,导致 T/NT 比率较低。目前正在对连接体或/和 99mTc-chelate 进行进一步改良,以提高肿瘤靶向效力和体内动力学特征。Copyright © 2009 John Wiley & Sons, Ltd. All Rights Reserved.