Osteoblast-seeded bioglass/gelatin nanocomposite: a promising bone substitute in critical-size calvarial defect repair in rat.

INTRODUCTION: Amid the plethora of methods to repair critical bone defects, there is no one perfect approach. In this study, we sought to evaluate a potent 3-dimensional (3D) bioactive SiO2-CaO-P2O5 glasses (bioglass)/gelatin (gel) scaffold for its biocompatibility by seeding cells as well as for its regenerative properties by animal implantation.

METHODS: Osteoblast cells were seeded onto nanocomposite scaffolds to investigate the process of critical-size calvarial defect via new bone formation. Scanning electron microscopy (SEM) was used to validate topography of the scaffolds, its homogeneity and ideal cellular attachment. Proliferation assay and confocal microscopy were used to evaluate its biocompatibility. To validate osteogenesis of the bioactive nanocomposite scaffolds, they were first implanted into rats and later removed and analyzed at different time points post mortem using histological, immunohistochemical and histomorphometric methods.

RESULTS: Based on in vitro results, we showed that our nanocomposite is highly cell-compatible material and allows for osteoblasts to adhere, spread and proliferate. In vivo results indicate that our nanocomposite provides a significant contribution to bone regeneration and is highly biodegradable and biocompatible. So, seeded scaffolds with osteoblasts enhanced repair of critical bone defects via osteogenesis.

CONCLUSIONS: We demonstrate the feasibility of engineering a nanocomposite scaffold with an architecture resembling the human bone, and provide proof-of-concept validation for our scaffold using a rat animal model.