Scientists at King’s College London have developed an experimental bone-healing material made from sheep wool that could one day offer a sustainable alternative to collagen in regenerative medicine.
The research focused on keratin, a structural protein naturally found in wool, hair, and nails. In laboratory and animal tests, the wool-derived material successfully supported bone regeneration and produced tissue that more closely resembled healthy natural bone than conventional collagen-based scaffolds. Researchers say the findings mark an important early step toward creating stronger, more stable biomaterials for bone repair and dental reconstruction, while also finding medical value in wool that is often discarded as agricultural waste.
The science behind the sheep wool bone-healing material
For decades, collagen has been widely used in regenerative medicine and dentistry as a scaffold material that supports healing around damaged bone. It acts as a protective barrier, preventing soft tissue from interfering with the repair process while giving bone time to regrow.Despite its widespread use, collagen comes with several limitations. Researchers say it can degrade too quickly and may lack the mechanical strength needed in areas exposed to pressure or weight-bearing stress.
Producing and extracting collagen can also be expensive and technically demanding.To search for alternatives, the King’s College London team turned to keratin, a tough structural protein extracted from sheep wool.The researchers chemically processed keratin from wool to create thin membranes that could function as scaffolds for growing new bone tissue. These membranes were designed to remain stable during healing while supporting the attachment and growth of bone-forming cells.The team first tested the material in laboratory experiments using human bone cells. According to the researchers, the cells attached successfully to the keratin membranes and showed strong signs of healthy bone development.
What happened in animal testing
After the laboratory phase, scientists implanted the keratin membranes into rats with skull defects large enough that they would not naturally heal on their own.Over several weeks, the researchers monitored how the material supported bone regeneration across the damaged areas.
While collagen scaffolds generated a greater quantity of bone overall, the keratin membranes produced bone tissue that was more organised and structurally stable.Researchers said the fibres created by the keratin scaffolds were better aligned and more closely resembled the structure of healthy natural bone.The study’s authors said the quality and stability of the regenerated bone may be one of the most important aspects of the research.
The keratin membranes also integrated well with surrounding tissue and remained stable throughout the healing process.Dr. Sherif Elsharkawy from King’s College London’s Faculty of Dentistry, Oral & Craniofacial Sciences described the work as the first successful demonstration of a wool-based material repairing bone in a living animal.He said the findings position keratin as a potential new category of regenerative biomaterial that could eventually challenge the long-standing reliance on collagen.
A sustainable source for future medicine
Researchers also highlighted the environmental benefits of the material. Sheep wool is naturally renewable and large amounts are often discarded as waste by the farming industry.Scientists believe using wool-derived keratin could provide a scalable and sustainable source of biomaterials for future medical applications, especially if further studies confirm its safety and effectiveness in humans.Although the results are promising, the technology remains in the early stages of development. The experiments have only been carried out in laboratory settings and animal models, meaning additional testing will be needed before the material can be used in patients.Even so, the research offers a glimpse into how natural materials such as wool could play a future role in bone repair, regenerative medicine, and dental surgery.
