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Synthesis, Characterization, and Biodistribution of a Dinuclear Gadolinium Complex with Improved Properties as a Blood Pool MRI Agent
ChemMedChem ( IF 3.6 ) Pub Date : 2018-03-06 , DOI: 10.1002/cmdc.201800052
Francesca La Cava 1 , Alberto Fringuello Mingo 2 , Luigi Miragoli 2 , Enzo Terreno 1 , Enrico Cappelletti 2 , Luciano Lattuada 2 , Luisa Poggi 2 , Sonia Colombo Serra 2
Affiliation  

A dinuclear gadolinium(III) chelate containing two moieties of diethylenetriaminepentaacetic acid (DTPA), covalently conjugated to an analogue of deoxycholic acid, was synthesized and thoroughly characterized. A full relaxometric analysis was carried out, consisting of 1) the acquisition of nuclear magnetic resonance dispersion (NMRD) profiles in various media; 2) the study of binding affinity to serum albumin; 3) the measurement of 17O transverse relaxation rate versus temperature, and 4) a transmetallation assay. In vivo biodistribution MRI studies at 1 T and blood pharmacokinetics assays were carried out in comparison with Gd‐DTPA (Magnevist) and gadocoletic acid trisodium salt (B22956/1), two well‐known Gd complexes that share the same chelating cage and the same deoxycholic acid residue of the Gd complex investigated herein ((GdDTPA)2‐Chol). High affinity for plasma protein and, in particular, the availability of more than one binding site, allows the complex to reach a fairly high relaxivity value in plasma (∼20 mm−1 s−1, 20 MHz, 310 K) as well as to show unexpectedly enhanced properties of blood pooling, with an elimination half‐life in rats approximately seven times longer than that of B22956/1.

中文翻译:

具有改善特性的双核with配合物的合成,表征和生物分布,可作为血池MRI剂

合成并彻底表征了包含两个部分的二亚乙基三胺五乙酸(DTPA)共价缀合到脱氧胆酸类似物的双核((III)螯合物。进行了完整的弛豫分析,包括:1)在各种介质中获取核磁共振色散(NMRD)曲线;2)对血清白蛋白结合亲和力的研究;3)测量17o横向弛豫速率与温度的关系,以及4)过渡金属化分析。与Gd-DTPA(Magnevist)和g酸三钠盐(B22956 / 1)进行了比较,在1 T进行了体内生物分布MRI研究,并进行了血液药代动力学分析,这两种著名的Gd络合物具有相同的螯合笼和相同的螯合剂本文研究的Gd复合物的脱氧胆酸残基((GdDTPA)2- Chol)。对血浆蛋白的高亲和力,尤其是超过一个结合位点的可用性,使复合物在血浆中达到相当高的弛豫值(〜20 m m -1  s -1,20 MHz,310 K),并显示出出乎意料的增强的血库特性,大鼠的消除半衰期比B22956 / 1的消除半衰期长约七倍。
更新日期:2018-03-06
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