DHA Helps Protect Cartilage Cells in Lab and Animal Models of Osteoarthritis

This laboratory and animal study looked at how docosahexaenoic acid (DHA), an omega-3 fatty acid, affects cartilage cells (chondrocytes) under conditions that mimic osteoarthritis (OA). Researchers used human cartilage cells treated with an inflammatory protein (IL-1β) to simulate OA, along with rats that had surgically induced joint damage.

DHA treatment was associated with more cartilage cell survival and less cell death compared to untreated samples. Under the microscope, DHA-treated cells showed increased signs of autophagy, a natural process cells use to clear out damaged components and maintain health. In the rat model, joints treated with DHA showed thicker cartilage, less visible degeneration, and better scores on a standard cartilage damage scale compared to untreated OA joints.

At the molecular level, DHA changed the activity of several signaling pathways involved in cell survival and self-cleanup, including mTOR, JNK, and p38, along with proteins linked to autophagy and cell death regulation (LC3, Beclin-1, and Bcl-2). The researchers suggest these pathway changes may explain how DHA influenced cartilage cell behavior in this model.