Development of 6-[<sup>18</sup>F]fluoro-carbohydrate-based prosthetic groups and their conjugation to peptides via click chemistry
作者:Charlotte Collet、Fatiha Maskali、Alexandra Clément、Françoise Chrétien、Sylvain Poussier、Gilles Karcher、Pierre-Yves Marie、Yves Chapleur、Sandrine Lamandé-Langle
DOI:10.1002/jlcr.3362
日期:2016.2
This work describes the development of new 6-[18F]fluoro-carbohydrate-based prosthetic groups equipped with an azido arm that are able to participate in copper(I)-catalyzed cycloadditions for 18F labeling of biomolecules under mild conditions. The radiolabeling in high radiochemical yields (up to 68 ± 6%) of these different prosthetic groups is presented. The flexibility of the azido arm introduced on the carbohydrate moieties allows efficient click reactions with different alkyne functionalized peptides such as gluthation or Arg-Gly-Asp derivatives in order to prepare glycopeptides. The radiosyntheses of 18F-labeled glycopeptides proceed in high radiochemical yields (up to 76%) in an automated process with excellent radiochemical purity. The addition of a sugar moiety on peptides should enhance the bioavailability, pharmacokinetic, and in vivo clearance properties of these glycopeptides, compared with the unlabeled native peptide, and these properties are highly favorable for positron emission tomography imaging. A high uptake of 18F-β-gluco-c(RGDfC) is shown by positron emission tomography imaging in a subcutaneous abscess model in the rat, revealing the potential of this tracer to monitor integrin expression as a part of inflammation and/or angiogenesis processes.
这项工作描述了新型6-[18F]氟代碳水化合物衍生辅基的开发,这些辅基配备了一个叠氮臂,能够在温和条件下参与铜(I)催化的环加成反应,用于生物分子18F标记。本文介绍了这些不同辅基的高放射化学产率(最高达68 ± 6%)的放射性标记。将叠氮臂引入到碳水化合物部分所提供的灵活性,使得其能与不同的炔基功能化肽(如谷胱甘肽或精氨酸-甘氨酸-天冬氨酸衍生物)高效进行点击反应,从而制备糖肽。18F标记糖肽的放射合成在自动化过程中以高放射化学产率(高达76%)进行,并且具有优异的放射性化学纯度。与未标记的天然肽相比,在肽上附加糖部分应改善这些糖肽的生物利用度、药代动力学和体内清除特性,这些特性对于正电子发射断层扫描成像非常有利。正电子发射断层扫描成像显示,18F-β-葡糖-c(RGDfC)在大鼠皮下脓肿模型中具有高摄取量,揭示了这种示踪剂在监测作为炎症和/或血管生成过程一部分的整合素表达方面的潜力。