Hyperbaric oxygen stimulates vascularization and bone formation in rat calvarial defects

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Tissue Engineering

Background:

• Hyperbaric oxygen (HBO) therapy is utilized to manage radiation-induced tissue necrosis.
• Reconstructive surgery is often necessary for irradiated patients, but HBO's impact on bone regeneration remains unclear.

Purpose of the Study:

• To investigate the effects of hyperbaric oxygen therapy on bone vascularization and regeneration in a rat calvarial defect model using poly(LLA-co-DXO) scaffolds.

Main Methods:

• Critical-sized calvarial defects in Wistar rats were created and implanted with poly(LLA-co-DXO) scaffolds.
• Animals were divided into hyperbaric oxygen (HBO) and normobaric oxygen groups.
• Samples were analyzed via RT-PCR, histology, and radiography at 2 and 8 weeks post-implantation.

Main Results:

• At 2 weeks, HBO treatment increased CD31+ cells, upregulated osteogenic gene expression, and downregulated pro-inflammatory cytokines.
• At 8 weeks, HBO treatment resulted in greater radiopacity and enhanced bone healing in calvarial defects compared to controls.

Conclusions:

• HBO therapy effectively stimulates vascularization and bone formation in rat calvarial defects.
• The findings support HBO as a beneficial treatment for enhancing bone regeneration in reconstructive surgery contexts.