Chemical and biological evaluation of 153Sm and 166Ho complexes of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis(methylphosphonic acid monoethylester) (H4dotpOEt)

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Authors

FOERSTROVÁ Michaela JANDUROVÁ Zuzana MARQUES Fernanda LURDES Gano LUBAL Přemysl VANĚK Jakub HERMANN Petr SANTOS Isabel

Year of publication 2008
Type Article in Periodical
Magazine / Source Journal of Inorganic Biochemistry
MU Faculty or unit

Faculty of Science

Citation
Field Inorganic chemistry
Keywords Radiopharmaceuticals; macrocyclic and phosphonate complexes; cyclen derivative; DOTA analogue; lanthanide complexes; radiolanthanides; biodistribution; stability constants; formation and decomplexation kinetics
Description The novel methylphosphonic acid monoethylester (H4dotpOEt) has been synthesized and characterized and their complexes with Sm(III) and Ho(III) ions were studied. Dissociation constants of the ligand are lower than those of H4dota. The stability constants of the Ln(III)-H4dotpOEt complexes are surprisingly much lower that those of H4dota probably due to a lower coordination ability of the phosphonate monoester groups. Acid-assisted decomplexation studies have shown that both complexes are less kinetically inert than the H4dota complexes, but still much more inert than complexes of open-chain ligands. Nevertheless, the synthesis of 153Sm and 166Ho complexes with this ligand led to stable complexes both in vitro and in vivo. A very low binding of these complexes to hydroxyapatite (HA) and calcified tissues was observed confirming the assumption that a fully ionized phosphonate group(s) is necessary for a strong bone affinity. Both complexes show similar behaviour in vivo.
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