posted on 2024-02-23, 13:09authored byZheng Xi, Jing Xie, Jun Hu, Qin-Chao Wang, Ziyu Wang, Xiaoqiao Yang, Liying Zong, Mengyao Zhang, Xiaohuan Sun, Shouheng Sun, Jie Han
Uricase-catalyzed uric acid (UA) degradation has been
applied for
hyperuricemia therapy, but this medication is limited by H2O2 accumulation, which can cause oxidative stress of cells,
resulting in many other health issues. Herein, we report a robust
cubic hollow nanocage (HNC) system based on polyvinylpyrrolidone-coated
PdPt3 and PdIr3 to serve as highly efficient
self-cascade uricase/peroxidase mimics to achieve the desired dual
catalysis for both UA degradation and H2O2 elimination.
These HNCs have hollow cubic shape with average wall thickness of
1.5 nm, providing desired synergy to enhance catalyst’s activity
and stability. Density functional theory calculations suggest the
PdIr3 HNC surface tend to promote OH*/O* desorption for
better peroxidase-like catalysis, while the PdPt3 HNC surface
accelerates the UA oxidation by facilitating O2-to-H2O2 conversion. The dual catalysis power demonstrated
by these HNCs in cell studies suggests their great potential as a
new type of nanozyme for treating hyperuricemia.