Quercetin alleviates nanoparticle-induced osteolysis via deactivating pyroptosis.

As one of the most successful stories in modern medicine, total joint arthroplasty (TJA) is performed several million times worldwide every year. However, more than 20% of patients will suffer from aseptic loosening (AL) following periprosthetic osteolysis (PPO) in the next few years. Unfortunately, the only effective treatment for PPO, i.e., revision surgery, can cause great surgical trauma. It has been reported that the accumulation of reactive oxidative species (ROS) generated by exposure to wear particles could activate NLRP3 inflammasome in macrophages and accelerate the progress of osteolysis. Given that the conservative treatment is not effective and can be accompanied by apparent side effects, we, therefore, investigated the therapeutic effect of the natural compound quercetin (Que) on wear particle-induced osteolysis. Our results showed that Que could activate nuclear factor erythroid 2-related factor 2 (Nrf2) to remove ROS and deactivate inflammasome activation. Besides, the imbalance between osteoclastogenesis and osteogenesis induced by inflammatory cytokines was also rescued by Que. Collectively, our work demonstrates that Que may be a qualified candidate for the conservative treatment of wear particle-induced osteolysis.