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Photo-crosslinked bioactive BG/BMSCs@GelMA hydrogels for bone-defect repairs
Yufeng Ai1,2,3,4, Fang Dai1,2,3, Wenfeng Li1,2,3
1Center of Stomatology, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, 33006, China.
Materials Today. Bio
|January 1, 2024
Summary
This study developed a novel composite hydrogel using bioactive glass and mesenchymal stem cells for enhanced bone regeneration. The material shows promise for treating bone defects by promoting new bone growth and blood vessel formation.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Bone defects present significant clinical challenges, often requiring advanced regenerative strategies.
- Hydrogels loaded with bone marrow mesenchymal stem cells (BMSCs) show potential for bone regeneration but often lack sufficient osteo-inductive capacity.
- Enhancing the osteogenic potential of cell-laden hydrogels is crucial for effective clinical translation.
Purpose of the Study:
- To fabricate and evaluate a novel composite hydrogel incorporating bioactive glass (BG) and BMSCs within a gelatin methacryloyl (GelMA) matrix.
- To investigate the potential of this composite hydrogel for promoting bone regeneration, including its osteogenic, angiogenetic, and immunomodulatory properties.
- To assess the efficacy of the BG/BMSCs@GelMA hydrogel in a critical-sized calvarial defect model.
Main Methods:
- Fabrication of composite hydrogels (BG/BMSCs@GelMA) through photo-crosslinking of GelMA, BG, and BMSCs.
- In vitro assessment of cytocompatibility and osteogenic differentiation of BMSCs within the hydrogel.
- In vivo evaluation of the hydrogel in critical-sized calvarial defects in an animal model.
- Analysis of the hydrogel's effects on angiogenesis and macrophage polarization (M2 phenotype).
Main Results:
- The BG/BMSCs@GelMA hydrogel exhibited excellent cytocompatibility and significantly promoted osteogenic differentiation of BMSCs in vitro.
- In vivo studies demonstrated that the hydrogel effectively enhanced bone regeneration and promoted angiogenesis in critical-sized calvarial defects.
- The composite hydrogel was found to promote the polarization of macrophages towards the M2 phenotype, indicating immunomodulatory effects.
Conclusions:
- The novel BG/BMSCs@GelMA composite hydrogel possesses significant osteo-inductive, angiogenetic, and immunomodulatory capacities.
- This engineered hydrogel demonstrates substantial potential for clinical applications in treating challenging bone defects.
- The combination of bioactive glass, BMSCs, and GelMA offers a promising strategy for advanced bone tissue engineering.
