Engineered Xenogeneic Bone Scaffold with IL-10 Nanodelivery System: Immunomodulation and BMSC Fate Programming for...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Immunology

Background:

• Current skull defect reconstruction methods face challenges with artificial implants and autologous grafts.
• Artificial implants lack bioactivity and cause radiological artifacts.
• Autologous bone grafts are prone to unpredictable resorption and infection.

Purpose of the Study:

• To develop a multifunctional composite for enhanced skull defect repair.
• To modulate the immune response and promote stem cell differentiation for bone regeneration.
• To investigate the efficacy of a novel composite in a preclinical skull defect model.

Main Methods:

• Development of a composite integrating antigen-extracted xenogeneic scaffold, IL-10-loaded mesoporous polydopamine nanoparticles (MPDA@IL-10), and autologous bone marrow-derived mesenchymal stem cells (BMSCs).
• Establishment of a temporally phased immunoregulatory axis using exogenous IL-10 and endogenous BMSCs.
• Activation of PI3K-Akt/Wnt signaling pathway for BMSC osteogenic commitment.

Main Results:

• The composite demonstrated effective temporal immune modulation, reducing early inflammation.
• IL-10 promoted BMSC osteogenic commitment and suppressed adipogenic differentiation.
• Marked enhancement in radiographic and histological skull regeneration was observed in a canine model.

Conclusions:

• The developed composite offers a promising strategy for skull repair by combining temporal immune modulation and stem cell fate programming.
• This approach addresses limitations of current reconstruction methods, offering a translatable route for clinical application.
• The study highlights the potential of multifunctional biomaterials in regenerative medicine.