Longevity & AgingStress Hormone GDF-15 Rises After Cartilage Injury and May Help Chondrocytes Repair
Posttraumatic osteoarthritis (PTOA) develops after joint injuries, yet no biomarker reliably separates it from idiopathic OA. Researchers measured the stress-responsive cytokine GDF-15 in patient samples and in a human ex vivo cartilage trauma model. Synovial fluid GDF-15 was higher in PTOA than in idiopathic OA (about 626 vs 453 ng/mL). Injured cartilage cells made GDF-15 through oxidative stress and activation of p53, and senescent chondrocytes also secreted it. Surprisingly, adding recombinant GDF-15 did not worsen senescence. It increased chondrocyte proliferation and migration, reduced cell death, nitric oxide and matrix loss after trauma. GDF-15 may therefore be both a marker of joint injury and a pro-regenerative signal, though the findings come from small cohorts and laboratory models.
