Towards MRI contrast agents responsive to Ca(II) and Mg(II) ions: metal-induced oligomerization of dota-bisphosphonate conjugates

被引：19

作者：

Kubicek, Vojtech ^{[1
]}

Vitha, Tomas ^{[1
]}

Kotek, Jan ^{[1
]}

Hermann, Petr ^{[1
]}

Vander Elst, Luce ^{[2
]}

Muller, Robert N. ^{[2
]}

Lukes, Ivan ^{[1
]}

Peters, Joop A. ^{[3
]}

机构：

[1] Charles Univ Prague, Dept Inorgan Chem, Fac Sci, CR-12840 Prague, Czech Republic

[2] Univ Mons, Dept Organ & Biomed Chem, NMR & Mol Imaging Lab, B-7000 Mons, Belgium

[3] Delft Univ Technol, Dept Biotechnol, Delft, Netherlands

来源：

CONTRAST MEDIA & MOLECULAR IMAGING | 2010年 / 5卷 / 05期

关键词：

MRI; gadolinium complexes; bisphosphonate; responsive agents; COMPLEXES; RELAXATION; CHEMISTRY; DESIGN;

D O I：

10.1002/cmmi.386

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

In magnetic resonance imaging (MRI), paramagnetic complexes are utilized as contrast agents. Much attention has been paid to the development of new contrast agents responsive to pH, temperature or concentration of various components of body liquids. We report a new type of MRI probe sensing the concentrations of calcium and magnesium in biological media. The ligand do3ap(BP) combines a dota-like chelator with a bisphosphonate group. In the complex, the Gd(III) ion is entrapped in the macrocyclic cavity whereas the bisphosphonate group is not coordinated and therefore is available for coordination with endogenous metal ions. In the presence of metal ions, Gd-do3ap(BP) appears to show formation of coordination oligomers leading to an unprecedented increase in r(1) up to 200-500%. The extremely high relaxivity response makes this type of compound interesting for further studies as MRI ion-responsive probes for biomedical research. Copyright (C) 2010 John Wiley & Sons, Ltd.

引用

页码：294 / 296

页数：3