Bio-inspired multifunctional collagen/electrospun bioactive glass membranes for bone tissue engineering applications

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Bone diseases and defects require effective bone substitution materials.
• Current synthetic bone substitutes often struggle to mimic the complex native bone structure.
• There is a significant need for advanced materials that promote rapid healing and bone regeneration.

Purpose of the Study:

• To fabricate and characterize a bioinspired, multifunctional 3D membrane for bone tissue engineering.
• To evaluate the mechanical, biological, and drug delivery properties of the novel membrane.
• To assess the potential of the membrane for treating bone defects.

Main Methods:

• Fabrication of a 3D membrane using collagen and hollow bioactive glass fibers.
• Mechanical testing to assess Young's modulus and hydrophilicity.
• In vitro cell culture studies using fibroblast (3T3) and osteoblast (MG63) cells.
• Assessment of osteogenic activity via alkaline phosphatase and alizarin red staining.
• Evaluation of gene expression (Runx2, Col-Type-1) and protein levels (osteocalcin, osteonectin).
• In vivo vascularization assessment using the chick chorioallantoic membrane model.

Main Results:

• The collagen/hollow bioactive glass membrane exhibited superior mechanical robustness and optimal hydrophilicity compared to controls.
• Enhanced fibroblast cell adhesion, proliferation, and anisotropic alignment were observed.
• Significant promotion of osteoblast differentiation and osteogenic activity was demonstrated.
• Increased expression of key bone formation markers (Runx2, Col-Type-1, osteocalcin, osteonectin) was noted.
• The membrane supported vascularization in vivo.

Conclusions:

• The developed 3D multifunctional membrane mimics native bone structure and function.
• It demonstrates excellent mechanical properties, bioactivity, and osteogenic potential.
• This biomimetic material holds significant promise for bone tissue engineering and the treatment of bone defects.