Membrane-reinforced three-dimensional electrospun silk fibroin scaffolds for bone tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Materials Science

Background:

• Electrospun silk fibroin (SF) scaffolds mimic natural tissue but lack mechanical integrity for bone applications.
• Existing SF scaffolds require improved resistance to mechanical loading for effective bone tissue regeneration.

Purpose of the Study:

• To develop membrane-reinforced electrospun SF scaffolds with enhanced mechanical properties.
• To evaluate the biocompatibility and bone regenerative potential of these novel SF scaffolds.

Main Methods:

• Fabrication of SF scaffolds using a serial electrospinning and freeze-drying process with formic acid and water solvents.
• Incorporation of hydroxyapatite (HAP) nanoparticles and varying SF concentrations to enhance mechanical reinforcement.
• In vitro cell culture with human osteoblasts and in vivo studies in rat calvarial defect models.

Main Results:

• Membrane reinforcement, controlled by SF concentration, significantly increased scaffold resistance to compressive loading.
• Inclusion of HAP nanoparticles further enhanced mechanical strength.
• SF and SF-HAP scaffolds demonstrated superior biocompatibility and osteoblast proliferation compared to collagen scaffolds.
• In vivo studies showed enhanced bone tissue formation in rat calvarial defects using SF-HAP scaffolds.

Conclusions:

• Membrane-reinforced SF scaffolds offer a promising strategy to improve mechanical integrity for bone tissue engineering.
• SF-HAP composite scaffolds exhibit excellent biocompatibility and osteoconductivity, promoting significant bone regeneration.
• These advanced SF scaffolds represent a viable alternative to traditional collagen-based materials for bone defect repair.