Scientists have found a way to stimulate the body to regrow damaged joint cartilage and prevent osteoarthritis — at least in aging mice. The breakthrough was achieved by researchers at Stanford University School of Medicine and their colleagues. The findings were published in the journal Science.
The method involves blocking a protein called 15-PGDH, which scientists classify as a “gerozyme,” or aging-related enzyme. Its levels increase with age, roughly doubling in the cartilage of mice by old age. When the protein was suppressed, damaged cartilage in the knee joints of older animals regenerated. Furthermore, the animals did not develop osteoarthritis after injuries resembling anterior cruciate ligament (ACL) tears.
The effect was also tested in human tissue. Cartilage samples taken from patients undergoing knee replacement surgery showed a similar regenerative response.
“The cartilage regenerated in old mice to an extent that surprised us,” said one of the study's authors, Nidhi Bhutani. Her colleague Helen Blau described the approach as “a new way to regenerate adult tissue” with significant clinical potential.
The problem this research seeks to address is substantial. Approximately one in five American adults has osteoarthritis, and annual treatment costs reach $65 billion. About half of people who sustain an ACL tear develop osteoarthritis within 15 years. Until now, damaged cartilage — which has very limited capacity for self-repair — has generally been managed with pain relief and, in severe cases, joint replacement surgery.
The authors emphasize that the research is still at the preclinical stage: the results were obtained in animals and tissue samples, not in human clinical trials. Further research and safety assessments will be required before the method can be used in clinical practice. Nevertheless, the findings point toward a fundamentally different approach to treatment: restoring the body's own cartilage rather than replacing the joint.
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