Investigation of Vasculogenesis Inducing Biphasic Scaffolds for Bone Tissue Engineering

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Vascularization is a major challenge in bone tissue engineering for large defects.
• Angiogenic factors are crucial for accelerating vascularization and bone healing.

Purpose of the Study:

• To construct and evaluate a biphasic scaffold for enhanced bone healing and vascularization.
• To incorporate a vascular endothelial growth factor-A (VEGF) inducer (GS4012) into the scaffold.

Main Methods:

• Fabrication of a biphasic scaffold from fibrous poly(lactide-co-glycolide) (PLGA) and PLGA-PEG-PLGA hydrogel.
• Loading the scaffold with GS4012, a VEGF inducer.
• In vitro testing using rat bone marrow mesenchymal stem cells (rBMSCs) and rat peripheral blood endothelial cells (rPBECs) for cell proliferation, osteogenic gene expression, and endothelial cell recruitment.
• In vivo evaluation on critical-sized rat cranial defects to assess bone healing and vascularization.

Main Results:

• In vitro studies demonstrated endothelial cell migration and VEGF induction in response to GS4012.
• Upregulation of osteogenic markers (ALP, Runx2, Col I, OC) in rBMSCs was observed.
• In vivo results showed improved endothelial cell recruitment, vascularization, and bone healing in critical-sized defects.

Conclusions:

• The biphasic scaffold effectively promotes endothelial cell recruitment and osteogenic differentiation.
• The scaffold demonstrates significant potential for healing critical-sized bone defects through enhanced vascularization and bone regeneration.