MOF-derived CuO@ZnO modified titanium implant for synergistic antibacterial ability, osteogenesis and angiogenesis

Yunhui Si; Huanyao Liu; Hongying Yu; Xuzhou Jiang; Dongbai Sun

doi:10.1016/j.colsurfb.2022.112840

MOF-derived CuO@ZnO modified titanium implant for synergistic antibacterial ability, osteogenesis and angiogenesis

Colloids Surf B Biointerfaces. 2022 Nov:219:112840. doi: 10.1016/j.colsurfb.2022.112840. Epub 2022 Sep 13.

Authors

Yunhui Si¹, Huanyao Liu², Hongying Yu³, Xuzhou Jiang⁴, Dongbai Sun⁵

Affiliations

¹ School of Materials, Sun Yat-Sen University, Shenzhen 518107, PR China.
² Center for Stem Cell Biology and Tissue Engineering, Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat-Sen University, Guangzhou 510080, PR China.
³ School of Materials, Sun Yat-Sen University, Shenzhen 518107, PR China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, PR China. Electronic address: yuhy26@mail.sysu.edu.cn.
⁴ School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, PR China; Nanotechnology Research Center, Sun Yat-sen University, Guangzhou 510275, PR China. Electronic address: jiangxzh7@mail.sysu.edu.cn.
⁵ School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510006, PR China; National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, PR China; Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, PR China. Electronic address: sundongbai@mail.sysu.edu.cn.

PMID: 36113223
DOI: 10.1016/j.colsurfb.2022.112840

Abstract

Surface modification of titanium implants with antibacterial, osteogenic and even angiogenic capabilities are essential to enhance their clinical applicability. Herein, metal-organic framework (MOF) derived CuO@ZnO composite was grafted onto the polydopamine (PDA) modified titanium alloy to achieve vascularized bone regeneration. The CuO@ZnO-coated titanium effectively inhibits the formation of bacterial biofilms and the sterilization rate of Staphylococcus aureus (S. aureus) reaches 99%. Benefitting from the intrinsic porous architecture of MOFs, the Zn²⁺ and Cu²⁺ could be controllably released to facilitate the production of excess intracellular reactive oxygen species (ROS) inside the bacteria, which ensures the excellent antibacterial performance of the composite coating. The CuO@ZnO-coated titanium also exhibits good cytocompatibility, effectively promotes the adhesion and proliferation of the human bone marrow mesenchymal stem cells (hBMSCs) and reduces the level of the cell apoptosis. The up-regulated expression of the osteogenesis-related genes and the superior extracellular matrix mineralization reveals that the CuO@ZnO coating possesses fantastic osteoinductive properties. In addition, the transwell and tube formation assays of the human umbilical vein endothelial cells (HUVECs) suggest the superior angiogenesis ability of the CuO@ZnO-coated titanium. The released Cu²⁺ stimulated the angiogenesis of the HUVECs in vitro by up-regulating the expression of the vascular endothelial growth factor (VEGF). These findings will provide new insight into the development of multifunctional titanium implants for clinical applications.

Keywords: Angiogenesis; Antibacterial; CuO@ZnO; MOF; Osteogenesis; Titanium implants.