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4-Hydroxy-3,5-pyridinedicarboxylic Acids: Synthesis, Complexation Properties Towards Fe(III), Al(III), Cu(II), Zn(II), Human Serum Albumin, and Cellular Toxicity

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Abstract

4-hydroxy-3,5-pyridinedicarboxylic acid (DQ58) and 4-hydroxy-1-methyl-3,5-pyridinedicarboxylic acid (DQ71508) have been synthesized, and their Fe(III), Al(III), Cu(II), and Zn(II) coordination properties have been studied by potentiometry, UV–Vis spectroscopy (in the case of Fe(III), Al(III), Cu(II)), 1H-NMR (for Al(III)) and EPR (for Cu(II)). The thermodynamic results were used to model the extent of the toxic metal ions decorporation (Fe(III) or Al(III)) in the presence of the essential metal ions (Cu(II) or Zn(II)). DQ58 and DQ71508 were demonstrated to interact with human serum albumin (HSA), which is assumed to be the main serum transporter of the chelators, and binding constants have been obtained by ultrafiltration. IC50 values of 5.185 × 10−3 and 1.033 × 10−3 mol·L−1 were collected after 24 and 48 h of treatment with DQ71508 towards human embryonic kidney HEK-293 cells, demonstrating the relatively low cytotoxicity of this compound. According to these results, both DQ58 and DQ71508 seem to be potential candidates for Fe chelation therapy, and DQ58 is a better Fe(III) chelator than DQ71508.

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Acknowledgements

This work was supported by University of Padova, ‘‘Progetto Ateneo 2008, CPDA083904/08, 54000 €’’. We thank Nicola Bianchetto, Annamaria Cassini, Maristella Feltracco, Maria Zulpo (University of Padova), and Nelli Suba (University of Szeged), for their excellent work. The research was supported by the National Research, Development and Innovation Office-NKFIH through project GINOP-2.3.2-15-2016-00038.

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Correspondence to Valerio B. Di Marco.

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Dean, A., Ferlin, M.G., Carta, D. et al. 4-Hydroxy-3,5-pyridinedicarboxylic Acids: Synthesis, Complexation Properties Towards Fe(III), Al(III), Cu(II), Zn(II), Human Serum Albumin, and Cellular Toxicity. J Solution Chem 47, 92–106 (2018). https://doi.org/10.1007/s10953-018-0709-0

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