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Cytotoxic effect of galvanically coupled magnesium-titanium particles
1Department of Biomedical and Chemical Engineering, L.C. Smith College of Engineering and Computer Science, Syracuse University, Syracuse, New York 13244, USA; Syracuse Biomaterials Institute, Syracuse University, Syracuse, New York 13244, USA.
Acta Biomaterialia
|November 25, 2015
Summary
Magnesium-titanium particles show enhanced cell-killing effects compared to magnesium alone, offering potential for cancer and infection therapies. Electrochemical reactions, not just pH changes, drive this cytotoxicity.
Area of Science:
- Biomaterials Science
- Materials Chemistry
- Cell Biology
Background:
- Metallic biomaterials can induce cell death via reduction reactions.
- This phenomenon has potential therapeutic applications, including cancer treatment and antibacterial effects.
Purpose of the Study:
- To evaluate the cell-killing capability (cytotoxicity) of magnesium (Mg) particles, particularly when galvanically coupled with titanium (Ti).
- To investigate the role of electrochemical reactions versus pH changes in particle-induced cell death.
Main Methods:
- MC3T3-E1 mouse pre-osteoblast cell cultures were exposed to varying concentrations of Mg-only and Ti-coated Mg particles.
- Cell viability was assessed, and pH levels were monitored.
- Experiments were conducted using pH-adjusted medium without particles to isolate the effect of pH.
Main Results:
- Both Mg and Mg-Ti particles exhibited dose-dependent cytotoxicity.
- Ti-coated Mg particles demonstrated significantly greater cell killing at lower concentrations compared to Mg alone (P<0.05).
- Complete cell killing was observed at 750 μg/ml for Mg-Ti and 1500 μg/ml for Mg.
- No significant difference in pH was observed between particle types at similar concentrations, and pH-adjusted medium alone did not induce comparable cell death.
Conclusions:
- Galvanically coupled Mg-Ti particles possess a potent cell-killing capability exceeding that of Mg particles alone.
- The observed cytotoxicity is primarily attributed to electrochemical reactions, potentially involving reactive oxygen intermediates, rather than solely pH alterations.
- This study highlights the therapeutic potential of Mg-based particles for applications in infection control and cancer treatment.
