Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 47, Pages 11366-11374Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201701939
Keywords
antitumor agents; bioinorganic chemistry; cancer; copper; nonsteroidal anti-inflammatory
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Funding
- Leverhulme Trust [ECF-2014-178]
- King's College London Faculty Graduate School International Studentship
- Natural Science Foundation of China [21401078]
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Four copper(II) complexes, 1-4 containing regioisomeric vanillin Schiff base derivatives and the nonsteroidal anti-inflammatory drug (NSAID), naproxen, were synthesised and characterised. All complexes effectively cleave DNA in cell-free systems, with 4 displaying the highest nuclease activity. DNA binding studies suggest that 4 binds to DNA via the grooves prior to inducing oxidative DNA cleavage. Three of the complexes (1, 3, and 4) indiscriminately kill cancer stem cell (CSC)-enriched cells (HMLER-shEcad) and bulk cancer cells (HMLER) at micromolar concentrations. The most effective complex, 4 also reduced the formation and size of mammospheres to a similar extent as salinomycin, a well-established CSC-potent agent. Mechanistic studies show that 4 is readily taken up by CSCs, elevates intracellular reactive oxygen species (ROS) levels, causes DNA damage, and induces caspase-dependent apoptosis. Furthermore, 4 inhibits cyclooxygenase-2 (COX-2) expression and causes COX-2-dependent CSC death. The advantage of 4 over bulk cancer cell-or CSC-selective agents is that it has the potential to remove whole tumor populations (bulk cancer cells and CSCs) with a single dose.
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