Synthesis, radiolabelling and biological evaluation of terminal oxamide derivatives of mercaptoacetyltriglycine
作者:S.M. Okarvi、P. Torfs、P. Adriaens、A.M. Verbruggen
DOI:10.1002/jlcr.568
日期:2002.4
99mTc-MAG3 is widely used in clinical nuclear medicine as a potential replacement of 131I-OIH for renal function studies. The terminal carbonylglycine in the MAG3 backbone is assumed to be essential for maintaining its efficient renal handling characteristics. A number of MAG3-derivatives have been prepared and evaluated in which the terminal carbonylglycine sequence is substituted by an oxamide moiety in order to study the effect of the modified carbonylglycine sequence on the renal handling characteristics. These ‘oxamide’ derivatives have been synthesized starting from mercaptoacetic acid or cysteamine using the common synthetic procedures of peptide chemistry. These thiol-protected MAG3-precursors were labelled with 99mTc by an exchange method using tartrate as a complexing agent. Biodistribution studies in mice showed that some of these agents were cleared rapidly from the blood and efficiently excreted into the urine and displayed comparable renal excretion characteristics to those of 99mTc-MAG3. Copyright © 2002 John Wiley & Sons, Ltd.
99mTc-MAG3广泛用于临床核医学,作为131I-OIH用于肾功能研究的潜在替代品。MAG3骨架中的末端羰基甘氨酸被认为对其高效肾处理特性至关重要。已经制备并评估了一系列MAG3衍生物,其中末端羰基甘氨酸序列被草酰胺基团替代,以研究修饰的羰基甘氨酸序列对肾处理特性的影响。这些“草酰胺”衍生物是从巯基乙酸或半胱胺开始合成的,采用肽化学的常见合成程序。这些硫醇保护的MAG3前体通过使用酒石酸作为配位剂的交换方法用99mTc进行标记。在小鼠中的生物分布研究表明,其中一些试剂迅速从血液中清除并有效排入尿液,显示出与99mTc-MAG3相当的肾排泄特性。版权所有 © 2002 John Wiley & Sons, Ltd.