[en] A new macrocyclic DOTA-like ligand (BPAMD) for bone imaging and therapy containing a monoamide bis(phosphonic acid) bone-seeking group was designed and synthesized. Its lanthanide(ill) complexes were prepared and characterized by H-1 and P-31 INIMR spectroscopy. The Gd(III)-BPAMD complex was investigated in detail by H-1 and O-17 relaxometric studies to inspect parameters relevant for its potential application as an MRI contrast agent. Sorption experiments were conducted with Gd(Ill) and Tb(III) complexes using hydroxyapatite (HA) as a model of bone surface. Very effective uptake of the Gd-BPAMD complex by the HA surface was observed in NMR experiments. Radiochemical studies with the (Tb-160-BPAMD)-HA system proved the sorption to be remarkably fast and strong on one hand and fully reversible on the other hand. The strong (Gd-BPAMD)-HA interaction was also supported by H-1 NMRD measurements in the presence of a hydroxyapatite slurry, which showed an increase of the rotational correlation time upon adsorption of the complex on the HA surface, resulting in a significant relaxivity enhancement. The amide-bis(phosphonate) moiety is the only factor responsible for the binding of the complex to HA.
Disciplines :
Radiology, nuclear medicine & imaging Chemistry
Author, co-author :
Kubicek, V.
Rudovsky, J.
Kotek, J.
Hermann, P.
Vander Elst, Luce ; Université de Mons > Faculté de Médecine et de Pharmacie > Biochimie métabolique et moléculaire
Muller, Robert ; Université de Mons > Faculté de Médecine et de Pharmacie > Chimie générale, organique et biomédicale
Kolar, Z.I.
Wolterbeek, H.T.
Peters, J. A.
Lukes, I.
Language :
English
Title :
A bisphosphonate monoamide analogue of DOTA: A potential agent for bone targeting
Publication date :
01 January 2005
Journal title :
Journal of the American Chemical Society
ISSN :
0002-7863
Publisher :
American Chemical Society, United States - District of Columbia
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