Abstract
The search for orally effective drugs for the treatment of iron overload disorders is an important goal in improving the health of patients suffering diseases such as β-thalassemia major. Herein, we report the syntheses and characterization of some new members of a series of N-aroyl-N′-picolinoyl hydrazine chelators (the H2IPH analogs). Both 1:1 and 1:2 FeIII:L complexes were isolated and the crystal structures of Fe(HPPH)Cl2, Fe(4BBPH)Cl2, Fe(HAPH)(APH) and Fe(H3BBPH)(3BBPH) were determined (H2PPH=N,N′-bis-picolinoyl hydrazine; H2APH=N-4-aminobenzoyl-N′-picolinoyl hydrazine, H23BBPH=N-3-bromobenzoyl-N′-picolinoylhydrazine and H24BBPH=N-(4-bromobenzoyl)-N′-(picolinoyl)hydrazine). In each case, a tridentate N,N,O coordination mode of each chelator with Fe was observed. The FeIII complexes of these ligands have been synthesized and their structural, spectroscopic and electrochemical characterization are reported. Five of these new chelators, namely H2BPH (N-(benzoyl)-N′-(picolinoyl)hydrazine), H2TPH (N-(2-thienyl)-N′-(picolinoyl)-hydrazine), H2PPH, H23BBPH and H24BBPH, showed high efficacy at mobilizing 59Fe from cells and inhibiting 59Fe uptake from the serum Fe transport protein, transferrin (Tf). Indeed, their activity was much greater than that found for the chelator in current clinical use, desferrioxamine (DFO), and similar to that observed for the orally active chelator, pyridoxal isonicotinoyl hydrazone (H2PIH). The ability of the chelators to inhibit 59Fe uptake could not be accounted for by direct chelation of 59Fe from 59Fe–Tf. The most effective chelators also showed low antiproliferative activity which was similar to or less than that observed with DFO, which is important in terms of their potential use as agents to treat Fe-overload disease.
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Abbreviations
- DFO:
-
Desferrioxamine
- Tf:
-
Transferrin
- HPCIH:
-
2-Pyridylcarbaldehyde isonicotinoyl hydrazone
- H2IPH:
-
N-isonicotinoyl-N′-picolinoyl hydrazine
- H2BPH:
-
N-benzoyl-N′-picolinoyl hydrazine
- H2APH:
-
N-4-aminobenzoyl-N′-picolinoyl hydrazine
- H23BBPH:
-
N-3-bromobenzoyl-N′-picolinoyl hydrazine
- H2PPH:
-
N,N′-bis-picolinoyl hydrazine
- H2TPH:
-
N-2-thienyl-N′-picolinoyl hydrazine
- H2IIH:
-
N,N′ bis-isonicotinoyl hydrazine
- H2PIH:
-
Pyridoxal isonicotinoyl hydrazone
- FA:
-
Friedreich’s ataxia
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Acknowledgements
We gratefully acknowledge support from the Australian Research Council (DP0450001) to P.V.B and D.R.R. and the National Health and Medical Research Council of Australia for Project and Fellowship Support to D.R.R. D.R.R. also thanks the National Ataxia Foundation USA and Muscular Dystrophy Association USA for grant support. Children’s Cancer Institute Australia for Medical Research is affiliated with the University of New South Wales and Sydney Children’s Hospital. Dr. David Lovejoy and Ms. Danuta Kalinowski are thanked for their helpful comments on this manuscript.
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Bernhardt, P.V., Chin, P., Sharpe, P.C. et al. Novel diaroylhydrazine ligands as iron chelators: coordination chemistry and biological activity. J Biol Inorg Chem 10, 761–777 (2005). https://doi.org/10.1007/s00775-005-0018-0
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DOI: https://doi.org/10.1007/s00775-005-0018-0