Degradable magnesium-based implant materials with anti-inflammatory activity

Area of Science:

• Biomaterials Science
• Materials Engineering
• Biomedical Engineering

Background:

• Biodegradable metallic biomaterials are crucial for medical implants.
• Magnesium (Mg)-based alloys offer potential due to their biodegradability.
• Current Mg-based materials often lack sufficient mechanical integrity and functional properties.

Purpose of the Study:

• To prepare a novel biodegradable Mg-based biomaterial (Mg-Zn-Ag) with enhanced mechanical properties and anti-inflammatory function.
• To investigate the role of silver (Ag) as a grain refiner and anti-inflammatory agent.
• To evaluate the potential of this alloy system for coronary stent applications.

Main Methods:

• Zone solidification technology and extrusion were employed for alloy preparation.
• Mechanical properties were assessed, focusing on grain refinement strengthening.
• Cytocompatibility was evaluated using standard cell assays.
• Anti-inflammatory effects were determined by measuring interleukin-1α and nitric oxide levels in degradation products.

Main Results:

• The Mg-Zn-Ag alloy exhibited improved mechanical properties, primarily due to fine grain strengthening.
• The biomaterial demonstrated good cytocompatibility.
• Degradation products showed significant anti-inflammatory activity, correlated with silver ion concentration.
• Interleukin-1α and nitric oxide levels were modulated by the alloy's degradation products.

Conclusions:

• The developed Mg-Zn-Ag alloy is a promising biodegradable biomaterial with both mechanical integrity and inherent anti-inflammatory capabilities.
• Silver incorporation enhances mechanical properties and provides a dose-dependent anti-inflammatory effect.
• This Mg-Zn-Ag system holds potential as an anti-inflammatory metallic stent, potentially reducing long-term reliance on anti-inflammatory drugs post-implantation.