Novel Polar Single Amino Acid Chelates for Technetium-99m Tricarbonyl-Based Radiopharmaceuticals with Enhanced Renal Clearance: Application to Octreotide
作者:Kevin P. Maresca、John C. Marquis、Shawn M. Hillier、Genliang Lu、Frank J. Femia、Craig N. Zimmerman、William C. Eckelman、John L. Joyal、John W. Babich
DOI:10.1021/bc900517x
日期:2010.6.16
Single amino acid chelate (SAAC) systems for the incorporation of the M(CO)3 moiety (M = Tc/Re) have been successfully incorporated into novel synthetic strategies for radiopharmaceuticals and evaluated in a variety of biological applications. However, the lipophilicity of the first generation Tc(CO)3-dipyridyl complexes has resulted in substantial hepatobiliary uptake when either examined as lysine
用于结合M(CO)3部分(M = Tc / Re)的单氨基酸螯合物(SAAC)系统已成功地结合到放射性药物的新型合成策略中,并在各种生物学应用中进行了评估。但是,第一代Tc(CO)3-二吡啶基复合物的亲脂性在被检测为赖氨酸衍生物或整合到具有生物活性的小分子和肽中时已导致大量的肝胆吸收。在这里,我们设计,合成和评估了经过化学修饰以提高总体Tc(CO)3 L 3的新型SAAC系统复杂的亲水性,旨在增强肾脏清除率。通过赖氨酸的ε氨基的还原烷基化反应,合成了一系列由官能化的极性咪唑环和/或羧酸组成的赖氨酸衍生的SAAC体系。用99m Tc对SAAC系统进行放射性标记,进行纯化,并评估其在大鼠中的放射化学稳定性,亲脂性和组织分布。通过实验确定了99m Tc配合物的log P值,范围为-0.91至-2.33。所得复合物在至少24小时内稳定(> 90%)。正常大鼠铅99m的组织分布与二吡啶基赖氨酸复合物(DpK)相比,注射后2