[18F]Fluorobenzoyllysinepentanedioic Acid Carbamates: New Scaffolds for Positron Emission Tomography (PET) Imaging of Prostate-Specific Membrane Antigen (PSMA)

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• 作者：Xing Yang ; Ronnie C. Mease ; Mrudula Pullambhatla ; Ala Lisok ; Ying Chen ; Catherine A. Foss ; Yuchuan Wang ; Hassan Shallal ; Hannah Edelman ; Adam T. Hoye ; Giorgio Attardo ; Sridhar Nimmagadda ; Martin G. Pomper
• 刊名：Journal of Medicinal Chemistry
• 出版年：2016
• 出版时间：January 14, 2016
• 年：2016
• 卷：59
• 期：1
• 页码：206-218
• 全文大小：570K
• ISSN：1520-4804

文摘

Radiolabeled urea-based low-molecular weight inhibitors of the prostate-specific membrane antigen (PSMA) are under intense investigation as imaging and therapeutic agents for prostate and other cancers. In an effort to provide agents with less nontarget organ uptake than the ureas, we synthesized four ¹⁸F-labeled inhibitors of PSMA based on carbamate scaffolds. 4-Bromo-2-[¹⁸F]fluorobenzoyllysineoxypentanedioic acid (OPA) carbamate [¹⁸F]23 and 4-iodo-2-[¹⁸F]fluorobenzoyllysine OPA carbamate [¹⁸F]24 in particular exhibited high target-selective uptake in PSMA+ PC3 PIP tumor xenografts, with tumor-to-kidney ratios of >1 by 4 h postinjection, an important benchmark. Because of its high tumor uptake (90% injected dose per gram of tissue at 2 h postinjection) and high tumor-to-organ ratios, [¹⁸F]23 is promising for clinical translation. Prolonged tumor-specific uptake demonstrated by [¹⁸F]24, which did not reach equilibrium during the 4 h study period, suggests carbamates as alternative scaffolds for mitigating dose to nontarget tissues.