The replacement of amide bonds in the backbone of peptides by proteolytically stable 1,2,3-triazole isosteres can provide novel peptidomimetics with promising properties for the development of tumor-targeting radiopeptides. On the basis of our previous work with radiolabeled agonistic bombesin (BBN) derivatives of the sequence [Nle14]BBN(7–14), we substituted selected amide bonds of the structurally closely related antagonistic peptide analog JMV594. With the exception of the C-terminal modification, amide-to-triazole substitutions tolerated by [Nle14]BBN(7–14) without loss of biological function led to abolished receptor affinity in the case of JMV594. These findings provide an additional piece of evidence for the currently disputed differences in the modes of action of agonistic and antagonistic gastrin-releasing peptide receptor (GRPR)-targeting radiopeptides. Copyright © 2013 John Wiley & Sons, Ltd.
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1,2,3-三唑同类物替代肽骨架中的酰胺键,可以提供具有良好性质的新型肽类模拟物,促进肿瘤靶向放射肽的发展。基于我们之前对放射性标记的激动剂蛙肽(BBN)衍
生物[Nle14]BBN(7–14)的研究,我们对结构上密切相关的拮抗肽类似物JMV594的选定酰胺键进行了替换。除了C端的修饰外,[Nle14]BBN(7–14)能够耐受的酰胺-三唑替换在JMV594的情况下导致了受体亲和力的丧失。这些发现为当前有争议的激动剂与拮抗剂胃泌素释放肽受体(GRPR)靶向放射肽的作用机制差异提供了额外的证据。版权所有 © 2013 John Wiley & Sons, Ltd.