Synthesis, radiolabelling, and in vitro evaluation of a new 125I-labelled iodouracil hexitol nucleoside analogue are reported. The target compound was successfully synthesized by an iodination–destannylation method and then purified by reverse phase HPLC. The radiochemical purity of the product was >99% with decay-corrected yields of 48±3%. In vitro cellular uptake testing was carried out using MCA and MCA-tk cell lines for comparison of compound 1 with [18F]FHBG. The newly synthesized compound 1 showed higher accumulation in herpex simplex virus type 1 thymidine kinase (HSV1-tk) gene expression cell line (MCA-tk cell line) than in the wild type MCA cell line compared with [18F]FHBG. The MCA-tk to MCA cellular uptake ratio for compound 1 was higher than that of [18F]FHBG from 2 h after incubation. The radioiodine-labelled compound 1 (I-125, t1/2=59.37 days) has a longer physical half-life than F-18-(t1/2=110 min) labelled FHBG. Radioiodine-labelled compound 1 could be used for monitoring gene expression for a long time. The selectivity for MCA-tk cell line makes compound 1 a promising imaging agent for HSV1-tk expression. Copyright © 2010 John Wiley & Sons, Ltd.
报道了一种新的125I标记的
碘尿
嘧啶己醇核苷类似物的合成、放射性标记和体外评估。目标化合物通过
碘化-去
锡化方法成功合成,并通过反相高效
液相色谱法纯化。产品的放射
化学纯度超过99%,其衰变校正产率为48±3%。体外细胞摄取测试采用MCA和MCA-tk
细胞系,比较化合物1与[18F]FHBG的表现。新合成的化合物1在单纯疱疹病毒1型胸腺
嘧啶激酶(HSV1-tk)
基因表达
细胞系(MCA-tk
细胞系)中的积累高于野生型MCA
细胞系,且与[18F]FHBG相比,化合物1的MCA-tk与MCA细胞摄取比率在孵育2小时后更高。放射性
碘标记的化合物1(I-125,t1/2=59.37天)的物理半衰期长于F-18(t1/2=110分钟)标记的FHBG。放射性
碘标记的化合物1可以用于长期监测
基因表达。对MCA-tk
细胞系的选择性使得化合物1成为HSV1-tk表达的有前景的成像剂。版权 © 2010 John Wiley & Sons, Ltd.