Synthesis and automated fluorine‐18 radiolabeling of new PSMA‐617 derivatives with a CuAAC radiosynthetic approach
作者:Marco N. Iannone、Stefano Stucchi、Elia A. Turolla、Chiara Beretta、Samuele Ciceri、Clizia Chinello、Lisa Pagani、Sergio Todde、Patrizia Ferraboschi
DOI:10.1002/jlcr.3959
日期:2022.3
In the last decade, the development of new radiopharmaceuticals for the imaging and therapy of prostate cancer has been a highly active and important area of research, especially focusing on the prostate-specific membrane antigen (PSMA), an antigen which is upregulated in prostate, as well as in other tumor cells. A large variety of PSMA ligands have been radiolabeled, to date. Among the various derivatives, PSMA-617 resulted to be one of the most interesting in terms of interaction with the antigen and clinical properties, and its lutetium-177 labeled version has recently been approved by regulatory agencies for therapeutic purposes. For this reasons, the radiolabeling with fluorine-18 of a PSMA-617 derivative might be of interest. Beside other methodologies to radiolabel macromolecules with fluorine-18, the “click-chemistry” approach resulted to be very useful, and the copper-catalyzed azide-alkyne cycloaddition (CuAAC) is considered one of most efficient and reliable. This paper proposes the synthesis of a suitable precursor for the radiolabeling with fluorine-18 of a new PSMA-617 derivative. The whole radiosynthetic procedure has been fully automated, and the final product, which proved to be stable in plasma, has been obtained with radiochemical yield and purity suitable for subsequent preclinical studies.
近十年来,用于前列腺癌成像和治疗的新型放射性药物的开发一直是一个非常活跃和重要的研究领域,尤其是前列腺特异性膜抗原(PSMA),这是一种在前列腺和其他肿瘤细胞中上调的抗原。迄今为止,已有多种 PSMA 配体被放射性标记。在各种衍生物中,PSMA-617 是在与抗原的相互作用和临床特性方面最令人感兴趣的一种,其镥-177 标记版本最近已被监管机构批准用于治疗目的。因此,用氟-18 对 PSMA-617 衍生物进行放射性标记可能会引起人们的兴趣。除了用氟-18 对大分子进行放射性标记的其他方法外,"点击化学 "方法也非常有用,铜催化叠氮-炔环加成(CuAAC)被认为是最有效、最可靠的方法之一。本文提出了一种合适的前体合成方法,用于对一种新的 PSMA-617 衍生物进行氟-18 辐射标记。整个放射合成过程完全自动化,最终产物在血浆中稳定,其放射化学收率和纯度适合后续的临床前研究。