Optimizing Water Exchange Rates and Rotational Mobility for High-Relaxivity of a Novel Gd-DO3A Derivative Complex Conjugated to Inulin as Macromolecular Contrast Agents for MRI
作者:Luigi Granato、Luce Vander Elst、Celine Henoumont、Robert N. Muller、Sophie Laurent
DOI:10.1002/cbdv.201700487
日期:2018.2
removing the amide function from the DOTA‐AA ligand [1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetraacetic acid mono(p‐aminoanilide)] (L) previously designed. This new ligand 10[2(1‐oxo‐1‐p‐propylthioureidophenylpropyl]‐1,4,7,10‐tetraazacyclodecane‐1,4,7‐tetraacetic acid (L1) was then covalently conjugated to API [O‐(aminopropyl)inulin] to get the complex API‐(GdL1)x with intent to slow down the rotational
由于了解了配位水分子与大环 Gd 配合物的停留寿命 τM 与这些结构的旋转迁移率 τR 之间的关系,并且根据顺磁弛豫理论,现在可以设计大分子造影剂通过配体结构修饰优化这两个参数来增强弛豫度。我们通过在水结合位点周围诱导空间压缩,并通过去除 DOTA-AA 配体 [1,4,7,10-四氮杂环十二烷-1,4,7,10-四乙酸酸单(对氨基苯胺)](L)先前设计。这种新的配体 10[2(1-oxo-1-p-丙基硫脲基苯基丙基]-1,4,7,10-四氮杂环癸烷-1,4, 然后将 7-四乙酸 (L1) 与 API [O-(氨基丙基) 菊粉] 共价结合以获得复合物 API-(GdL1)x,目的是减慢大分子复合物的旋转相关时间 (τR)。不同磁场下纵向弛豫率的评估和低分子量化合物(GdL1)在不同温度下的 17O-NMR 研究表明,τM 值略有下降(τM310 = 331 ns vs. τM310 = 450