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

V. Kubíček, T. Vitha, J. Kotek, P. Hermann, L. Vander Elst, R. N. Muller, I. Lukeš, J. A. Peters

. 2010 ; 5 (5) : 294-296.

Jazyk angličtina Země Spojené státy americké

Typ dokumentu časopisecké články, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/bmc12026696

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.

Citace poskytuje Crossref.org

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$a In magnetic resonance imaging (MRI), paramagnetic complexes are utilized as contrast agents. Much attention has been paid to the development of new contrast agents responsive to pH, temperature or concentration of various components of body liquids. We report a new type of MRI probe sensing the concentrations of calcium and magnesium in biological media. The ligand do3ap(BP) combines a dota-like chelator with a bisphosphonate group. In the complex, the Gd(III) ion is entrapped in the macrocyclic cavity whereas the bisphosphonate group is not coordinated and therefore is available for coordination with endogenous metal ions. In the presence of metal ions, Gd-do3ap(BP) appears to show formation of coordination oligomers leading to an unprecedented increase in r(1) up to 200-500%. The extremely high relaxivity response makes this type of compound interesting for further studies as MRI ion-responsive probes for biomedical research.
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$a Viťha, Tomáš $7 _AN061390 $u Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague,Prague, Czech Republic
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$a Kotek, Jan, $d 1976- $7 jx20071212039 $u Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague,Prague, Czech Republic
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$a Hermann, Petr, $d 1963- $7 uk2008403108 $u Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague,Prague, Czech Republic
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$a Lukeš, Ivan, $d 1947- $7 jn20000710422 $u Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague,Prague, Czech Republic
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$a Peters, Joop A. $u Biocatalysis and Organic Chemistry, Department of Biotechnology, Delft University of Technology, Delft, The Netherlands
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