Scientists at King’s College London have developed an experimental bone healing material made from sheep’s wool that could one day offer a sustainable alternative to collagen in regenerative medicine.
The research focused on keratin, a structural protein found naturally 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 traditional collagen-based scaffolds. Researchers say the findings represent an important early step towards creating stronger, more stable biomaterials for bone repair and tooth reconstruction, while also finding medical value in wool that is often discarded as agricultural waste.
The science behind sheep wool for bone healing
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 the bone time to regrow.Despite its widespread use, collagen comes with several limitations. They can degrade very quickly and may lack the necessary mechanical strength in areas subject to pressure or weight-bearing stress, researchers say.
Producing and extracting collagen can be expensive and technically demanding.To search for alternatives, the King’s College London team turned to keratin, a strong structural protein extracted from sheep’s wool.The researchers chemically treated the keratin from wool to create thin films that can serve as scaffolds for the growth of new bone tissue. These membranes are 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 successfully attached to keratin membranes and showed strong signs of healthy bone growth.
What happened in animal experiments?
After the laboratory phase, scientists implanted keratin membranes in mice with skull defects large enough that they could not heal naturally on their own.Over several weeks, the researchers monitored how the material supported bone regeneration in damaged areas.
While collagen scaffolds produced a greater amount of bone overall, keratin membranes produced more organized and structurally stable bone tissue.The fibers created by the keratin scaffolds were better aligned and more closely resembled the structure of healthy, natural bone, the researchers said.The quality and stability of regenerated bone may be one of the most important aspects of the research, the study authors said.
The keratin membranes also integrated well with the surrounding tissue and remained stable throughout the healing process.Dr Sherif El-Sharkawy from the School of Dentistry and Oral and Craniofacial Sciences at King’s College London described the work as the first successful demonstration of a wool-based material for bone repair in a living animal.He said the findings position keratin as a potential new class of renewable biomaterials that could ultimately challenge long-term dependence on collagen.
A sustainable source for future medicine
The researchers also highlighted the environmental benefits of the material. Sheep wool is naturally renewable and large quantities are often discarded as waste by the agricultural industry.Scientists believe that the use of wool-derived keratin could provide a scalable and sustainable source of biomaterial for future medical applications, especially if additional studies confirm its safety and effectiveness in humans.Although the results are promising, the technology is still in the early stages of development. Trials have only been conducted in laboratories and animal models, meaning additional testing will be needed before the substance is used on patients.However, 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.