Department of Chemistry, University of Texas at Dallas , 800 West Campbell Road, Richardson, Texas 75080, United States.
Advanced Imaging Research Center, University of Texas Southwestern Medical Center , Dallas, Texas 75390, United States.
J Am Chem Soc. 2017 Dec 6;139(48):17431-17437. doi: 10.1021/jacs.7b08292. Epub 2017 Nov 17.
A previous report demonstrated that EuDO3A could be used as an NMR shift reagent for imaging extracellular lactate produced by cancer cells using CEST imaging. In this work, a series of heptadentate macrocyclic YbDO3A-trisamide complexes with δ-chiral carbons in the three pendant side-arms were examined as shift reagents for lactate detection. High resolution H NMR spectra and DFT calculations provided evidence for the formation of stereoselective lactate·YbDO3A-trisamide complexes each with a different CEST signature. This stereoselectivity allowed discrimination of d- versus l-lactate by both high-resolution NMR and CEST. This work demonstrates that lanthanide-based paramagnetic shift reagents can be designed to detect important metabolites by CEST MRI selectively.
先前的一份报告表明，EuDO3A 可用作 NMR 位移试剂，通过 CEST 成像对癌细胞产生的细胞外乳酸进行成像。在这项工作中，研究了一系列具有 δ-手性碳的七齿大环 YbDO3A-三酰胺配合物作为位移试剂，用于检测乳酸。高分辨率 H NMR 光谱和 DFT 计算为形成立体选择性乳酸·YbDO3A-三酰胺配合物提供了证据，每个配合物都具有不同的 CEST 特征。这种立体选择性允许通过高分辨率 NMR 和 CEST 对 d-乳酸与 l-乳酸进行区分。这项工作表明，基于镧系元素的顺磁位移试剂可通过 CEST MRI 选择性地设计用于检测重要代谢物。
