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  A rigidified AAZTA-like ligand as efficient chelator for 68Ga radiopharmaceuticals

Vágner, A., D'Alessandria, C., Gambino, G., Schwaiger, M., Aime, S., Maiocchi, A., et al. (2016). A rigidified AAZTA-like ligand as efficient chelator for 68Ga radiopharmaceuticals. Chemistry Select, 1(2), 163-171. doi:10.1002/slct.201500051.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-7A16-F Version Permalink: http://hdl.handle.net/21.11116/0000-0000-7A17-E
Genre: Journal Article

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Vágner, A, Author
D'Alessandria, C, Author
Gambino, G1, Author              
Schwaiger, M, Author
Aime, S, Author
Maiocchi, A, Author
Tóth, I, Author
Baranyai, Z, Author
Tei, L, Author
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: The new cyclohexane-fused CyAAZTA ligand was synthesized to increase the structural rigidity of the heptadentate chelator AAZTA with the aim of improving the overall stability of its GaIII complex. The stability constant of Ga(CyAAZTA)−, determined both by pH-potentiometry (logKGaL=21.39) and by 71Ga NMR (logKGaL=21.92), was found similar to that of GaAAZTA (logKGaL=22.18). The kinetic inertness of Ga(CyAAZTA)− was investigated by following its transmetallation and ligand exchange reactions with Cu2+ and human serum transferrin, respectively. The formation of a hydroxido-complex near pH 7 decreases the half-life (t1/2) of the dissociation reactions for Ga(CyAAZTA)− compared to Ga(AAZTA)− (8.5 h vs 21 h, pH 7.4). However, at pH < 7 the t1/2 of Ga(CyAAZTA)− is much longer (234 h at pH 6). Finally, CyAAZTA was successfully radiolabelled with 68Ga in acetate buffer at pH 3.8, in 15 minutes at room temperature at [CyAAZTA]=10 μM, with a labelling yield higher than 80 . A 1 μM solution of CyAAZTA was successfully labelled (L.Y.: 97.4 ) in 5 minutes at 90 °C. Stability tests in human serum and in the presence of 50 mM DTPA showed no significant decomposition of 68GaCyAAZTA over 90 minutes.

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 Dates: 2016-02
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/slct.201500051
BibTex Citekey: VagnerDGSAMTBT2016
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Title: Chemistry Select
Source Genre: Journal
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Pages: - Volume / Issue: 1 (2) Sequence Number: - Start / End Page: 163 - 171 Identifier: -