Bioactive glass-biopolymers‑gold nanoparticle based composites for tissue engineering applications.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Tissue Engineering

Background:

• Bioactive glasses with gold nanoparticles offer potential for tissue regeneration and angiogenesis.
• Alginate-pullulan polymer composites are being explored for biomedical applications.

Purpose of the Study:

• Develop novel alginate-pullulan composites incorporating bioactive glass with gold nanospheres (BGAuSP) and gold nanocages (BGAuIND).
• Evaluate biocompatibility of these composites in vitro and in vivo.
• Compare performance against composites using β-tricalcium phosphate-hydroxyapatite (βTCP/HA).

Main Methods:

• Structural and morphological characterization of novel composites.
• In vitro cell viability testing on fibroblast and osteoblast cell lines.
• Subcutaneous implantation in Sprague Dawley rats for in vivo biocompatibility assessment (14, 30, 60 days) with histopathology and immunohistochemistry.

Main Results:

• Composites exhibited suitable thermal stability and appropriate pore sizes (micrometers to 100 μm).
• Bioactivity confirmed by self-assembled apatite layer formation after simulated body fluid immersion.
• All composites demonstrated optimal in vitro cellular proliferation and biocompatibility.
• In vivo studies showed excellent biocompatibility of BGAuNP composites with marked angiogenesis and tissue proliferation (Vimentin+ cells).
• βTCP/HA composite induced an inflammatory foreign body response.

Conclusions:

• Novel bioactive glass and gold nanoparticle composites demonstrate excellent in vitro and in vivo biocompatibility.
• These composites promote angiogenesis and tissue proliferation, outperforming βTCP/HA based materials.
• The developed BGAuNP-alginate-pullulan composites show significant promise for soft tissue and bone engineering.