Abstract
The novel DOTA-like chelator 1,4,7,10-tetraazacyclododecane-1-{4-[(3-chloro-4-fluorophenyl)amino]quinazoline-6-yl}propionamide-4,7,10-triacetic acid (H3L) was synthesised by alkylation of 1,4,7,10-tetraazacyclododecane-1,4,7-tris(t-butyl acetate) with N-{4-[(3-chloro-4-fluorophenyl)amino]quinazoline-6-yl}-3-bromopropionamide, followed by hydrolysis of the ester groups with trifluoracetic acid. H3L has been fully characterised by multinuclear NMR spectroscopy, mass spectrometry and high-performance liquid chromatography (HPLC). Five protonation constants, log K Hi , of H3L were determined by potentiometry and UV–vis spectrophotometry and the values found are 10.47, 9.18, 5.24, 4.00 and 2.23. These methods, complemented with variable-pH 71Ga NMR studies, allowed us to ascertain the stability constant of the Ga(III) complex of L. GaL has a remarkably high thermodynamic stability constant (log K ML = 24.5). The radioactive complex 67GaL was prepared in high yield and high radiochemical purity. Its HPLC chromatogram is identical to that obtained for the GaL complex prepared at the macroscopic level. At pH 7.4, 67GaL has an overall neutral charge, is highly hydrophilic (log D = −1.02 ± 0.03) and presents high in vitro stability in physiological media and in the presence of an excess of diethylenetriaminepentaethanoic acid . In vitro studies indicated that H3L and GaL do not inhibit the cell growth of epidermal growth factor receptor expressing cell lines, such as A431 cervical carcinoma cells, a result which agrees with the very low cell internalisation found for 67GaL in the same cell line. Biodistribution studies in mice indicated high in vivo stability for 67GaL, a high total excretion rate and a relatively slow blood clearance, in full accordance with its hydrophilic character and the relatively important protein binding.
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Acknowledgments
This work was partially support by the FCT (POCTI/QUI/57632/2004) and by COST Action D38. R.G. would like to thank the Fundação para a Ciência e Tecnologia for a postdoctoral research grant. We wish to acknowledge Ana Coelho and Joaquim Marçalo from the Laboratório de Espectrometria de Massa at the ITQB-Universidade Nova de Lisboa, Oeiras, Portugal, and from the ITN, Sacavém, Portugal, respectively, for the ESI-MS analysis. We thank Zsolt Baranyai for his help in preparing the Ga(NO3)3 solution. The quadrupole ion trap mass spectrometer was acquired with the support of the Programa Nacional de Reequipamento Científico (contract REDE/15037/REM/2005-ITN) of Fundação para a Ciência e a Tecnologia and is part of RNEM-Rede Nacional de Espectrometria de Massa.
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Garcia, R., Fousková, P., Gano, L. et al. A quinazoline-derivative DOTA-type gallium(III) complex for targeting epidermal growth factor receptors: synthesis, characterisation and biological studies. J Biol Inorg Chem 14, 261–271 (2009). https://doi.org/10.1007/s00775-008-0446-8
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DOI: https://doi.org/10.1007/s00775-008-0446-8