Synthesis and Biological Evaluation of Pyrazolo[1,5-a]-pyrimidine-containing 99mTc Nitrido Radiopharmaceuticals as Imaging Agents for Tumors
作者:Rui Ding、Yong He、Jingli Xu、Hang Liu、Xiao Wang、Man Feng、Chuanmin Qi、Junbo Zhang
DOI:10.3390/molecules15128723
日期:——
The compound 5-((2-aminoethylamino)methyl)-7-(4-bromoanilino)-3-cyano-pyrazolo[1,5-a]pyrimidine (ABCPP) was synthesized and conjugated with N-mercapto-acetylglycine (MAG), N-mercaptoacetylphenylalanine (MAF) and N-mercaptoacetylvaline (MAA), respectively. These three compounds were labeled successfully with [99mTcN]2+ intermediate in high radiochemical purities. Biodistribution in tumor-bearing mice demonstrated that the three new complexes showed tumor accumulation, high tumor-to-muscle (T/M) ratios and fast clearance from blood and muscle. Among them, the 99mTcN-MAG-ABCPP showed the most favorable characteristics, with tumor/blood and tumor/ muscle ratios reaching 1.51 and 2.97 at 30 min post-injection, 1.84 and 2.49 at 60 min post-injection, suggesting it could be further studied as potential tumor imaging agent for single photon emission computed tomography (SPECT).
合成了5-((2-氨基乙基氨基)甲基)-7-(4-溴苯胺基)-3-氰基吡唑并[1,5-a]嘧啶(ABCPP),并分别与N-巯基乙酰甘氨酸(MAG)、N-巯基乙酰苯丙氨酸(MAF)和N-巯基乙酰缬氨酸(MAA)共轭。这三种化合物均成功标记了[99mTcN]2+中间体,且放射化学纯度很高。在肿瘤小鼠体内的生物分布表明,这三种新复合物具有肿瘤蓄积、高肿瘤-肌肉(T/M)比和快速从血液和肌肉中清除的特点。其中,99mTcN-MAG-ABCPP表现出最有利的特性,注射后30分钟的肿瘤/血液和肿瘤/肌肉比分别达到1.51和2.97,注射后60分钟的肿瘤/血液和肿瘤/肌肉比分别达到1.84和2.49,这表明它可作为潜在的肿瘤成像剂用于单光子发射计算机断层扫描(SPECT)的进一步研究。