Structure–Activity Relationship of <sup>18</sup>F-Labeled Phosphoramidate Peptidomimetic Prostate-Specific Membrane Antigen (PSMA)-Targeted Inhibitor Analogues for PET Imaging of Prostate Cancer
作者:Shorouk Dannoon、Tanushree Ganguly、Hendry Cahaya、Jonathan J. Geruntho、Matthew S. Galliher、Sophia K. Beyer、Cindy J. Choy、Mark R. Hopkins、Melanie Regan、Joseph E. Blecha、Lubica Skultetyova、Christopher R. Drake、Salma Jivan、Cyril Barinka、Ella F. Jones、Clifford E. Berkman、Henry F. VanBrocklin
DOI:10.1021/acs.jmedchem.5b01850
日期:2016.6.23
A series of phosphoramidate-based prostate specific membrane antigen (PSMA) inhibitors of increasing lipophilicity were synthesized (4, 5, and 6), and their fluorine-18 analogs were evaluated for use as positron emission tomography (PET) imaging agents for prostate cancer. To gain insight into their modes of binding, they were also cocrystallized with the extracellular domain of PSMA. All analogs exhibited
一系列基于磷酸酯前列腺特异性膜抗原的(PSMA)增加亲脂性的抑制剂,合成(4,5,和6),以及它们的氟-18类似物进行了评价,用作正电子发射断层扫描(PET),用于前列腺癌的显像剂。为了深入了解它们的结合方式,它们还与PSMA的细胞外结构域共结晶。所有类似物均表现出与IC 50不可逆结合的PSMA值范围从0.4到1.3 nM。体外测定显示,PSMA(+)细胞中放射性标记的配体具有结合和快速内在化作用(80–95%,2小时)。体内分布显示CWR22Rv1(PSMA(+))肿瘤具有显着摄取,[ 18 F] 4,[ 18 F] 5和[ 18 F] 6,分别在注射后2小时。在氨基磷酸酯支架中安装氨基己酸(AH)接头可改善其PSMA结合和抑制作用,对于实现合适的体内成像特性,定位[ 18 F] 5和[ 18 F] 6至关重要。 作为未来前列腺癌成像临床试验的有利候选者。