One Injection That Regrows Cartilage and Reverses…

One Injection That Regrows Cartilage and Reverses Arthritis Published by TALMedora Editorial | Orthopaedics | Rheumatology | Regenerative Medicine Cartilage does not heal itself. This has been one of the most frustrating truths in musculoskeletal medicine since William Hunter first described it in 1743. Damaged cartilage does not regenerate. Once lost it is gone. Treatment focuses on managing pain, modifying activity and, when damage becomes severe enough, replacing the joint entirely. Nearly 300 years after Hunter's observation, a team at Stanford Medicine may have found a way to rewrite it. A landmark study published in the journal Science has demonstrated that blocking a single aging-related protein can reverse cartilage loss in older joints, prevent arthritis from developing after knee injury and, crucially, trigger cartilage regeneration in human tissue collected from knee replacement surgeries. The protein at the centre of this research is called 15-PGDH — 15-hydroxyprostaglandin dehydrogenase. Researchers at Stanford Medicine led by Dr Helen Blau, director of the Baxter Laboratory for Stem Cell Biology, and Dr Nidhi Bhutani, professor of orthopaedic surgery, classify 15-PGDH as a gerozyme, a protein whose levels increase with age and actively drive the decline of tissue function across multiple organ systems. The mechanism is elegant in its destructiveness. 15-PGDH breaks down prostaglandin E2, a signalling molecule central to tissue repair. As 15-PGDH accumulates with age, prostaglandin E2 is progressively depleted. Repair signals weaken. Cartilage loses its capacity to regenerate. The joint deteriorates. When researchers blocked 15-PGDH using a small molecule inhibitor, either through injection or systemic administration, the results in mice were striking. Blocking the aging-related protein restored healthy, shock-absorbing cartilage in old mice and injured joints, dramatically improving movement and joint function. In mice with knee injuries resembling ACL tears, one of the most common sports injuries and a well-established pathway to premature osteoarthritis, treatment with the 15-PGDH blocker significantly reduced the development of post-traumati