Objective:

To test keratin-based membranes derived from sheep wool as an alternative to collagen for guided bone regeneration.

Approach:

• Cell Viability Testing: Researchers tested keratin membranes with human bone marrow stromal cells.
• Animal Study: Conducted experiments on 42 male rats with 6-mm critical-size calvarial defects.

Key Findings:

• All keratin membranes supported cell viability.
• M-Ker5TE1 and highly crosslinked Ker5H3 showed strong metabolic activity and osteogenic gene expression.
• Ker5 films effectively kept fibroblasts at the surface, acting as a barrier against soft-tissue cell infiltration.
• After 8 weeks, collagen produced the greatest overall bone volume at 29.13 mm³, while Ker5 produced 17.73 mm³.
• Histology revealed defect bridging, lamellar-like bone, Haversian-like canals, and organized collagen architecture in Ker5.

Interpretation:

No signs of inflammation were observed after keratin implantation, indicating biocompatibility.

Limitations:

• Findings remain preclinical.
• Degradation, mechanical performance, and immune responses of keratin membranes need further investigation.

Conclusion:

The study suggests potential for sheep wool in orthopedic applications, though further research is required.

Sources:

• Biomaterials Advances