1. Design, Synthesis, and Characterization of Novel Iron Chelators: Structure−Activity Relationships of the 2-Benzoylpyridine Thiosemicarbazone Series and Their 3-Nitrobenzoyl Analogues as Potent Antitumor Agents
- Author
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David B. Lovejoy, Yi-Tyng Liao, Danuta S. Kalinowski, Paul V. Bernhardt, Yu Yu, Philip C. Sharpe, Des R. Richardson, Mohammad Islam, and Naresh Kumar
- Subjects
Thiosemicarbazones ,Pyridines ,Stereochemistry ,Iron ,Antineoplastic Agents ,Ascorbic Acid ,Crystallography, X-Ray ,Iron Chelating Agents ,Ligands ,Ferric Compounds ,Metal Chelator ,Redox ,Chemical synthesis ,Cell Line ,Hydroxylation ,Structure-Activity Relationship ,chemistry.chemical_compound ,Cell Line, Tumor ,Drug Discovery ,Pyridine ,otorhinolaryngologic diseases ,Humans ,Structure–activity relationship ,Ferrous Compounds ,Semicarbazone ,Molecular Structure ,Transferrin ,Ascorbic acid ,chemistry ,Drug Design ,Nitrobenzoates ,Molecular Medicine ,Drug Screening Assays, Antitumor ,Oxidation-Reduction ,Protein Binding - Abstract
Previously, we demonstrated that the potent antiproliferative activity of the di-2-pyridylketone thiosemicarbazone (DpT) series of Fe chelators was due to their ability to induce Fe depletion and form redox-active Fe complexes (Richardson, D. R.; et al. J. Med. Chem. 2006, 49, 6510-6521). We now examine the role of aromatic substituents on the antiproliferative and redox activity of novel DpT analogues, namely, the 2-benzoylpyridine thiosemicarbazone (BpT) and 2-(3-nitrobenzoyl)pyridine thiosemicarbazone (NBpT) series. Both series exhibited selective antiproliferative effects, with the majority having greater antineoplastic activity than their DpT homologues. This makes the BpT chelators the most active anticancer agents developed within our laboratory. The BpT series Fe complexes exhibit lower redox potentials than their corresponding DpT and NBpT complexes, highlighting their enhanced redox activity. The increased ability of BpT-Fe complexes to catalyze ascorbate oxidation and benzoate hydroxylation, relative to their DpT and NBpT analogues, suggested that redox cycling plays an important role in their antiproliferative activity.
- Published
- 2007
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