Scientists have discovered that a group of cells long linked to aging may actually play a vital role in repairing injured tendons. In mouse studies, p16INK4a+ cells rapidly accumulated after tendon injury and promoted collagen production, blood vessel growth, and tissue regeneration. When these cells were removed, healing was weaker, with disorganized collagen and increased inflammation. Researchers also identified JMJD3, an epigenetic regulator, as a key switch that activates repair genes in these cells. Blocking JMJD3 impaired healing, while enhancing its activity improved tendon strength and collagen organization. These findings challenge the belief that all aging-related cells are harmful and could lead to new treatments that promote faster, stronger tendon repair.
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