Synthesis and evaluation of 2-, 4-, 5-substituted nitroimidazole-iminodiacetic acid-99mTc(CO)3 complexes to target hypoxic tumors
作者:Madhava B. Mallia、Suresh Subramanian、Anupam Mathur、H. D. Sarma、Meera Venkatesh、Sharmila Banerjee
DOI:10.1002/jlcr.1754
日期:——
Determination of hypoxia in tumor is an important problem in the clinical management of cancer. Towards this, a series of differently substituted nitroimidazoles, viz. 2-nitro, 4-nitro and 5-nitroimidazole iminodiacetic acid (IDA) derivatives were synthesized and radio-labeled with a [99mTc(CO)3(H2O)3]+ core. The corresponding 185/187Re(CO)3 analogue of 2-nitroimidazole-IDA-99mTc(CO)3 complex was also prepared and characterized to elucidate the mode of bonding between the ligand and the M(CO)3 core (M=99mTc, 185/187Re). All the three nitroimidazole-IDA-99mTc(CO)3 complexes could be prepared in over 95% yield determined by HPLC. The three complexes were then evaluated in a suitable animal model bearing tumor. Though the in vivo accumulation of complexes in hypoxic tissue is governed by factors such as lipophilicity, charge, etc., the variation in accumulation in hypoxic tissue, in the present case, could be explained by considering the reported values of single electron reduction potential of the respective nitroimidazoles. Among the three derivatives studied, the 2-nitroimidazole-IDA-99mTc(CO)3 complex produced the best result followed by the 5-nitroimidazole complex. Copyright © 2010 John Wiley & Sons, Ltd.
肿瘤缺氧的测定是癌症临床治疗中的一个重要问题。为此,一系列不同取代的硝基咪唑,即。合成了 2-硝基、4-硝基和 5-硝基咪唑亚氨基二乙酸 (IDA) 衍生物,并用 [99mTc(CO)3(H2O)3]+ 核心进行放射性标记。还制备了 2-硝基咪唑-IDA-99mTc(CO)3 配合物的相应 185/187Re(CO)3 类似物并对其进行了表征,以阐明配体与 M(CO)3 核心之间的键合模式(M=99mTc, 185/187Re)。通过 HPLC 测定,所有三种硝基咪唑-IDA-99mTc(CO)3 配合物的产率均超过 95%。然后在合适的荷瘤动物模型中评估这三种复合物。尽管缺氧组织中复合物的体内积累受亲脂性、电荷等因素控制,但在目前的情况下,缺氧组织中积累的变化可以通过考虑单电子还原电位的报告值来解释。各自的硝基咪唑。在研究的三种衍生物中,2-硝基咪唑-IDA-99mTc(CO)3 络合物产生了最好的结果,其次是5-硝基咪唑络合物。版权所有 © 2010 约翰威利父子有限公司