Would Exosome Therapy be Effective for Bone Regeneration? Systematic Review and Meta-Analysis

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedics

Background:

• Tissue engineering offers potential solutions for bone defect regeneration.
• Exosomes (Exos) are emerging as key therapeutic tools in this field.
• Assessing Exos efficacy is crucial for clinical translation.

Purpose of the Study:

• To systematically review and analyze the effectiveness of exosome therapy for bone regeneration.
• To answer the PICO question: Is exosome therapy effective for bone regeneration?
• To evaluate bone regeneration, cellular, and molecular mechanisms, alongside dosage and administration routes.

Main Methods:

• Systematic review following PRISMA guidelines, with literature search until January 2024.
• Meta-analysis using standardized mean difference for bone mineral density (BMD) and bone volume/total volume (BV/TV).
• Risk of bias assessment using SYRCLE's RoB tool.

Main Results:

• 91 articles included, all demonstrating Exos effectiveness in promoting bone defect regeneration.
• Meta-analysis confirmed Exos superiority in improving BMD and BV/TV.
• Observed increases in osteogenic and angiogenic markers (Runx2, ALP, OCN, OPN, CD31, COL-1, VEGF) and cell types (osteoblasts, M2 macrophages, endothelial cells).

Conclusions:

• Exosome therapy is effective for bone regeneration, outperforming control groups.
• Mesenchymal stem cell-derived exosomes are frequently used, often combined with scaffolds or hydrogels.
• The findings indicate high scientific evidence supporting Exos therapy for bone defects, highlighting its therapeutic promise.