Colloidal Gels with Extracellular Matrix Particles and Growth Factors for Bone Regeneration in Critical Size Rat...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Craniofacial Surgery

Background:

• Colloidal gels offer paste-like properties for complex defect filling in bone regeneration.
• Current colloidal materials show limited success in craniofacial applications compared to orthopedics.
• A novel colloidal gel is needed to address limitations in craniofacial reconstruction.

Purpose of the Study:

• To develop and evaluate a novel colloidal gel for craniofacial bone regeneration.
• To assess the efficacy of incorporating hydroxyapatite, demineralized bone matrix, and decellularized cartilage.
• To investigate the role of growth factors (BMP-2, VEGF) in enhancing bone formation.

Main Methods:

• Colloidal nanoparticles of hydroxyapatite (HAp), demineralized bone matrix (DBM), and decellularized cartilage (DCC) were combined with hyaluronic acid (HA).
• Gels were formulated to achieve specific rheological properties (≥100 Pa).
• BMP-2 and VEGF growth factors were incorporated to evaluate extracellular matrix contribution.

Main Results:

• The HA-HAp (BMP-2) and HA-HAp-DCC groups demonstrated significantly higher bone regeneration (89% and 82%, respectively) compared to the sham group (p < 0.01).
• Desirable rheological properties were achieved for gel placement.
• Material retention challenges were noted, suggesting potential for chemical crosslinking.

Conclusions:

• Decellularized cartilage (DCC) shows promise as a component for bone regeneration.
• Colloidal gels represent a potentially valuable technology for craniofacial bone regeneration applications.
• Further development, including crosslinking, may enhance material retention and clinical utility.