Researchers discovered that lipid overload in cartilage cells triggers excessive fatty acid oxidation (FAO), producing acetyl-CoA that accumulates and disrupts normal cell function. This metabolic shift degrades SOX9—a master regulator of cartilage health—while epigenetically activating destructive enzymes MMP13 and ADAMTS7. A feedback loop involving the FAO enzyme HADHA amplifies the damage. Delivering trimetazidine, an FAO inhibitor, directly into joints of obese mice with surgical joint injury significantly reduced cartilage degradation. The study links obesity-related lipid metabolism to osteoarthritis through concrete molecular mechanisms, suggesting lipid-targeting therapies as a new OA treatment avenue.
