Ceria Nanozymes with Preferential Renal Uptake for Acute Kidney Injury Alleviation

Rhabdomyolysis-induced acute kidney injury (AKI) is closely related to abundant reactive oxygen species (ROS). Owing to the multi-enzymatic activity and broad-spectrum ROS scavenging capacity of ceria nanoparticles (ceria NPs), herein, we report ultrasmall citric acid modified ceria nanozymes (3-4 nm) as antioxidants to alleviate rhabdomyolysis-induced AKI through removing excessive ROS. The as-prepared ceria NPs exhibited multi-enzymatic properties such as peroxidase, catalase, and superoxide dismutase, offering efficient protection of renal cells against H₂O₂ stimulation in vitro. Moreover, due to their ultrasmall size, ceria NPs could efficiently accumulate in the kidneys, thus protecting renal cells against ROS in vivo. Our results present ultrasmall ceria nanozymes as antioxidants for rhabdomyolysis-induced AKI alleviation, which shows great potential in clinic.