Multifunctional 3D-Printed Titanium Alloy Composite-Coated Scaffold for Modulating the Immune Microenvironment and...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Immunology

Background:

• Bone tissue engineering seeks advanced biomaterials for enhanced regeneration.
• Current strategies aim to combine structural support with biological modulation.
• Immune modulation is a key factor in successful bone repair.

Purpose of the Study:

• To develop and evaluate a cytokine-functionalized Zn-incorporated titanium scaffold (IL4/IL13@SM@pTi-Zn).
• To investigate the scaffold's potential to improve bone regeneration via immune modulation and osteogenesis.
• To assess the scaffold's efficacy in a preclinical bone defect model.

Main Methods:

• Fabrication of cytokine-functionalized Zn-incorporated titanium scaffolds.
• In vitro assessment of osteogenic differentiation of mesenchymal stem cells.
• Quantitative polymerase chain reaction (qPCR) for gene expression analysis.
• In vivo evaluation using a rabbit femoral condyle defect model.
• Micro-computed tomography (Micro-CT) analysis for bone regeneration assessment.

Main Results:

• The IL4/IL13@SM@pTi-Zn scaffold demonstrated excellent biocompatibility.
• Significant promotion of osteogenic differentiation and upregulation of key osteogenic genes (ALP, COL1A1, Runx2, OPN).
• Reduced pro-inflammatory markers and reactive oxygen species, indicating immunomodulatory and antioxidant effects.
• In vivo studies showed enhanced bone regeneration, with increased bone volume fraction and trabecular thickness.

Conclusions:

• The IL4/IL13@SM@pTi-Zn scaffold effectively enhances bone repair.
• Synergistic promotion of osteogenesis and immune regulation contributes to improved bone regeneration.
• This biomaterial holds significant promise for clinical applications in bone defect repair.