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Temporal Immunomodulatory Hydrogel Regulating the Immune-Osteogenic Cascade for Infected Bone Defects Regeneration.

Chaonan Jin1,2, Jiaming Liang3, Jiangyi Wu4

  • 1Engineering Research Center of Advanced Rare Earth Materials (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, China.

Advanced Materials (Deerfield Beach, Fla.)
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This study introduces a novel hydrogel that temporally releases ions to manage the immune response in infected bone defects. It effectively clears pathogens and promotes bone regeneration by guiding macrophage polarization for improved healing.

Keywords:
immunomodulationinfected bone repairion releasemacrophage polarizationosteogenesis

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Area of Science:

  • Biomaterials Science
  • Immunology
  • Orthopedic Surgery

Background:

  • Effective repair of infected bone defects requires early pathogen clearance and balanced immunomodulation.
  • Current strategies often overlook the crucial role of M1 macrophages in initial infection control, potentially hindering bone regeneration.
  • A temporal immunomodulatory approach is needed to optimize the immune microenvironment for bone healing.

Purpose of the Study:

  • To develop a temporal immunomodulatory hydrogel for enhanced repair of infected bone defects.
  • To investigate the hydrogel's ability to modulate macrophage polarization for sequential infection control and bone regeneration.
  • To evaluate the hydrogel's efficacy in a preclinical model of infected cranial defects.

Main Methods:

  • Fabrication of a hydrogel via crosslinking of engineered protein and oxidized sodium alginate.
  • Incorporation of zinc-based nanoparticles mineralized with hydroxyapatite for temporal ion release (Ca2+ and Zn2+).
  • Assessment of hydrogel properties, including biocompatibility, antibacterial activity, and osteogenic potential in a rat cranial defect model.

Main Results:

  • The hydrogel successfully mimics extracellular matrix architecture, promoting cell adhesion, angiogenesis, and osteogenesis.
  • Early Ca2+ release promoted M1 macrophage polarization for infection inhibition, while sustained Zn2+ release induced M2 polarization for osteogenesis.
  • The hydrogel demonstrated antioxidant and antibacterial properties, effectively remodeling the osteoimmune microenvironment and facilitating vascularized bone regeneration in vivo.

Conclusions:

  • A temporal immunomodulatory hydrogel strategy effectively addresses infected bone defects by sequentially managing the immune response and promoting bone regeneration.
  • This biomaterial design offers a promising approach for treating challenging bone defects by optimizing the interplay between immunity and osteogenesis.
  • The findings provide valuable insights into designing advanced osteoimmunomodulatory biomaterials for regenerative medicine.