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A Highly-Active Chemodynamic Agent Based on In Situ Generated Copper Complexes from Copper Hexacyanoferrate
Javier Bonet-Aleta1,2,3,4,5, Jose L Hueso1,2,3,4,6, Angeles Valls-Chiva1,2,3,4
1Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Campus Río Ebro, Edificio I+D, C/Poeta Mariano Esquillor, s/n, Zaragoza, 50018, Spain.
Small (Weinheim an Der Bergstrasse, Germany)
|February 21, 2025
Summary
Novel copper hexacyanoferrate nanocubes effectively catalyze glutathione oxidation and selectively target cancer cells. This nanoparticle catalyst shows enhanced activity and potential for cancer therapy due to synergistic ion release and tumor microenvironment interactions.
Area of Science:
- Nanomaterials Science
- Catalysis
- Biomedical Engineering
Background:
- Glutathione (GSH) plays a crucial role in cellular redox balance and is often dysregulated in cancer.
- Iron and copper ions are known to catalyze GSH oxidation and promote reactive oxygen species (ROS) production via Fenton-like reactions.
- Developing targeted nanoparticle catalysts for cancer therapy requires understanding their interaction with the tumor microenvironment.
Purpose of the Study:
- To synthesize and characterize copper hexacyanoferrate (Cu2Fe(CN)6) nanocubes for catalytic applications.
- To investigate the catalytic activity of these nanocubes in promoting glutathione oxidation.
- To evaluate the selective cytotoxicity of the nanocubes against cancer cells in a tumor microenvironment context.
Main Methods:
- Synthesis of Cu2Fe(CN)6 nanocubes via self-assembly of Cu2+ and Fe(CN)6 3- precursors.
- Assessment of catalytic activity for GSH oxidation compared to traditional copper sources.
- Evaluation of nanocube disassembly and composition changes in the presence of tumor microenvironment-mimicking GSH concentrations.
- In vitro cytotoxicity assays on U251-MG cancer cells and healthy fibroblasts.
Main Results:
- Homogeneous Cu2Fe(CN)6 nanocubes (<100 nm) were successfully synthesized.
- Nanocubes exhibited significantly higher catalytic activity (≈50%) for GSH oxidation compared to CuCl2.
- Nanocubes demonstrated homogeneous disassembly in the presence of tumor-relevant GSH concentrations.
- Synergistic coordination of released Cu2+ and Fe(CN)6 3- ions was proposed to enhance GSH deprotonation and oxidation.
- Selective toxicity was observed, with lethal doses of 18 ppm Cu for U251-MG cells while sparing healthy fibroblasts.
Conclusions:
- Cu2Fe(CN)6 nanocubes are potent catalysts for GSH oxidation, exceeding the efficacy of simple copper salts.
- The disassembly of nanocubes in the tumor microenvironment, triggered by GSH, facilitates targeted drug delivery and action.
- These findings highlight the potential of Cu2Fe(CN)6 nanocubes as a selective anticancer therapeutic agent, leveraging synergistic catalytic effects and targeted disassembly.
