Theranostic MnO2 nanoparticles alleviate oxidative stress and visualize cartilage in osteoarthritis

Osteoarthritis (OA) is a prevalent degenerative joint disease characterized by progressive cartilage degeneration, driven by oxidative stress and mitochondrial dysfunction. This study investigates the therapeutic potential of popcorn-like manganese dioxide (MnO2) nanoparticles in treating OA. Leveraging their antioxidant properties, MnO2 nanoparticles mitigate reactive oxygen species (ROS) generation in chondrocytes, thus preventing mitochondrial damage and alleviating OA progression. Additionally, the unique magnetic resonance imaging (MRI) contrast enhancement capabilities of MnO2 nanoparticles enable non-invasive tracking of cartilage integrity. Our results demonstrate that MnO2 nanoparticles significantly reduce ROS levels, promote mitochondrial health, and restore cartilage structure in OA models. The integration of MnO2 nanoparticles for both therapy and imaging offers a novel, dual-functional approach to OA treatment.