Osteoarthritis (OA) is a debilitating musculoskeletal condition that affected over 595 million people worldwide in 2020. It is a multifactorial disease where underlying molecular mechanisms are poorly understood. Currently, no drugs are available for the treatment of OA, only analgesics and eventually, joint replacement through a highly invasive surgery. CaMKII has been shown to have an important role in bone development, and more recently has been implicated in OA. However, the role of CaMKII in chondrocytes is still poorly understood. 

This study used recombinant adenoviruses to modulate the activity of CaMKIIγ in human articular chondrocytes. We used multiple established molecular biology techniques, as well techniques specific to the articular cartilage, to uncover how CaMKII modulates both chondrocyte homeostasis and metabolism. 

Using the recombinant adenoviruses that we generated, amplified, and validated, we discovered that CaMKII plays a central role in various metabolic processes within articular chondrocytes. These processes include the promotion of anabolism, autophagy, and chondrocyte hypertrophy. Additionally, CaMKII contributes to cholesterol accumulation by inhibiting its efflux and alters the abundance of omega-6 polyunsaturated fatty acid levels.

The research presented in this body of work has identified several novel roles for CaMKII within articular chondrocytes. With further investigation into how the pathways modulated by CaMKII are linked, there may be an opportunity to harness the anabolic activity induced by CaMKII in the treatment of OA.