Researchers at King’s College London have demonstrated the potential of keratin, a protein extracted from wool, as a material for supporting bone repair and regeneration. The study involved testing wool-based keratin in animal models, where it was found to facilitate bone growth across damaged areas and generate new tissue with structural properties closely resembling natural, healthy bone.
The research addresses limitations of collagen, the current standard material used in regenerative medical and dental applications. While collagen has been effective as a scaffold for bone repair, it has several drawbacks including relative weakness, rapid degradation that can limit effectiveness in weight-bearing applications, and complications associated with extraction that make the process costly. Wool keratin offers advantages in durability and material sourcing.
In laboratory testing, keratin membranes created from chemically treated wool supported the growth of human bone cells and exhibited markers of healthy bone formation. The researchers then conducted animal trials using rats with skull defects large enough that they would not naturally heal. Over the following weeks, they monitored how effectively the keratin membranes promoted bone growth across the damaged regions.
The findings revealed meaningful differences between the two materials. While collagen membranes produced a greater total volume of bone, the tissue generated using keratin scaffolds demonstrated superior organization and structural integrity, with better-aligned fibers that more closely resembled natural bone composition. The keratin membranes remained stable throughout the healing process and integrated smoothly with surrounding tissue.
Beyond its medical performance, wool offers environmental and economic advantages as a biomaterial source. As a naturally derived material frequently discarded as waste by the agricultural industry, keratin extraction from wool could provide a renewable and scalable resource for bone repair applications, potentially reducing costs and environmental impact compared to traditional collagen-based approaches.
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