Fluid Shear-Controlled Pro/Anti-Inflammatory Osteomodulatory Construct for Drug-Free Immune Activation Through...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Immunology

Background:

• Effective bone regeneration necessitates integrating immune and mechanical signals, a challenge unmet by current biomaterials.
• Existing scaffolds often fail to provide the complex microenvironment required for optimal tissue healing.

Purpose of the Study:

• To develop an immunomodulatory scaffold using 3D printing and electrospinning that mimics bone and periosteum.
• To investigate the scaffold's ability to modulate macrophage polarization and support mesenchymal stem cell osteogenesis.

Main Methods:

• Fabrication of a dual-layer scaffold with an electrospun outer layer and a 3D-printed inner core.
• Application of physiological fluid shear stress (FSS) to induce macrophage polarization (M1/M2).
• RNA sequencing to identify key molecular pathways, including ion channels, involved in macrophage polarization.

Main Results:

• The scaffold successfully facilitated macrophage polarization into M1 and M2 states under FSS.
• Potassium channels were identified as crucial for dynamic macrophage polarization.
• The scaffold promoted mesenchymal stem cell-driven osteogenesis, creating a synergistic environment for bone repair.

Conclusions:

• The developed scaffold effectively integrates mechanotransduction and immune modulation for enhanced bone regeneration.
• This dual-function platform shows significant potential for improving tissue regeneration, particularly in immune-compromised individuals.
• The findings offer a novel approach to biomaterial design for regenerative medicine applications.