3D-printed bioceramic scaffolds with Fe3S4 microflowers for magnetothermal and chemodynamic therapy of bone tumor and regeneration of bone defects

Elimination of residual osteosarcoma cells and repair of bone defects remain major challenges for osteosarcoma in clinic. To address this problem, it is required that multifunctional therapeutic platform possess high tumor-killing efficiency and simultaneous bone regeneration capabilities. In this work, an intelligent therapeutic platform was developed to achieve highly-efficient tumor therapy and simultaneous significantly improved bone defect repairing ability, which was realized by in situ growing ferromagnetic Fe3S4 layers with tuned microstructures on the surface of 3D-printed akermanite bioceramic scaffolds via hydrothermal method. The Fe3S4 layers exploited magnetic thermal energy to enhance chemodynamic treatment, thus achieving a synergistic effect between magnetothermal and chemodynamic therapy on the elimination of residual tumor cells. Moreover, the micro-structured surface of the 3D-printed bioceramic scaffolds further enhanced the osteogenic activity in vitro and accelerated the bone regeneration in vivo. The scaffolds with multi-mode tumor-killing and bone repairing capabilities indicated that such a therapeutic platform is applicable for a stepwise treatment strategy of osteosarcoma and provides inspiration for the design of multifunctional biomaterials.