Injectable osteogenic and angiogenic nanocomposite hydrogels for irregular bone defects

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Injectable hydrogels are promising scaffolds for irregular bone defects.
• Poor vascularization hinders complete bone defect healing.
• Enhancing blood vessel formation is crucial for tissue regeneration.

Purpose of the Study:

• To develop an injectable composite hydrogel for bone regeneration.
• To incorporate fibrin nanoparticles (FNPs) for enhanced vascularization.
• To include magnesium-doped bioglass (MBG) for osteogenesis induction.

Main Methods:

• Fabrication of chitin/poly(butylene succinate) hydrogels with FNPs and MBG.
• Characterization using FTIR, SEM, EDS, and rheology.
• In vitro studies including cell viability (HUVECs, rASCs), aortic ring assay, and osteogenic differentiation assays.

Main Results:

• Composite hydrogels exhibited suitable rheological properties, injectability, and stability.
• The composite hydrogel (2% FNPs, 2% MBG) demonstrated good cytocompatibility.
• Enhanced blood vessel sprouting in the aortic ring assay and increased osteogenic marker expression were observed.

Conclusions:

• The developed injectable composite hydrogel effectively supports vascularization and osteogenesis.
• This biomaterial shows potential for regenerating irregular non load-bearing bone defects.
• The combination of FNPs and MBG offers a synergistic approach to bone tissue engineering.