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Polysaccharide-Based Composite Hydrogel with Hierarchical Microstructure for Enhanced Vascularization and Skull
Gonggong Lu1,2,3, Xiang Li1, Peilei Wang2,3
1Department of Neurosurgery, West China Hospital, Sichuan University, 37# Guoxue Lane, Chengdu, Sichuan 610041, P.R. China.
Biomacromolecules
|September 20, 2023
Summary
A new hybrid hydrogel scaffold effectively repairs critical-size skull defects. This bone substitute promotes stem cell activity and bone regeneration, offering a promising solution for cranial reconstruction.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Critical-size skull defects pose significant challenges in reconstructive surgery.
- Existing bone substitutes often lack optimal mechanical properties and biological integration.
Purpose of the Study:
- To develop and evaluate a novel hybrid cross-linked hierarchical microporous hydrogel scaffold (PHCLS) for skull defect repair.
Main Methods:
- Assembled PHCLS using poly(lactic-co-glycolic)/nanohydroxyapatite (PLGA-HAP) microspheres embedded in dopamine-modified hyaluronic acid and collagen I.
- Cross-linked the scaffold via Michael addition and calcium ion chelation.
- Evaluated scaffold properties in vitro and in vivo using a rabbit cranial defect model.
Main Results:
- PHCLS exhibited enhanced mechanical strength (5.24-fold increase) and improved pore structure.
- Promoted bone marrow mesenchymal stem cell proliferation, infiltration, and angiogenic differentiation in vitro.
- Achieved significant skull reconstruction in vivo, with 85.2% breaking load strength and 84.5% bone volume fraction after 12 weeks.
Conclusions:
- The developed PHCLS demonstrates excellent biocompatibility and osteoconductivity.
- This hierarchical microporous hydrogel scaffold represents a promising strategy for treating critical-size skull defects.
