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Zhao, Da‐Wang; Du, Chun‐Miao; Zuo, Kang‐Qing; Zhao, Yi‐Xiang; Xu, Xiao‐Qian; Li, Yi‐Bo; Tian, Shuai; Yang, Hong‐Ru; Lu, Yu‐Peng; Cheng, Lei; Xiao, Gui‐Yong
Advanced healthcare materials, 04/2023, Volume: 12, Issue: 9Journal Article
Zinc (Zn) alloys provide a new generation for orthopedic applications due to their essential physiological effects and promising degradation properties. However, excessive release of Zn ions (Zn2+) during degradation and the severe inflammatory microenvironment are not conducive to osseointegration, which is determined by the characteristics of the implant surface. Therefore, it is essential to modulate the release rate of Zn alloys by surface modification technology and endow them with anti‐inflammatory and osteogenic effects. In this study, two kinds of phosphate chemical conversion (PCC) coatings with different compositions and morphological structures are prepared, namely Zn–P (with disk‐like crystals) and Ca–Zn–P (with lamellar crystals). Although all the PCC‐coated Zn implants have low cytotoxicity, Ca–Zn–P show better osteoimmunomodulation effects in several aspects: the induction of the M2‐phenotype macrophage polarization and thus promotion of osteogenesis in vitro; the regulation of the bone immune microenvironment which is conducive to tissue regeneration and osseointegration in vivo; and the release of ions (through PI3K/AKT and Wnt signaling pathways) and the morphological structures (through RhoGTPase signaling pathways) act as possible mechanisms of M2 polarization. The Ca–Zn–P coating can be considered to provide new insights into bone immunomodulation and osseointegration. The phosphate chemical conversion coatings with different compositions and morphological structures are prepared, namely Zn–P (with disk‐like crystals) and Ca–Zn–P (with lamellar crystals). The Ca–Zn–P shows better osteoimmunomodulation effects and can be considered to provide new insights into bone immunomodulation and osseointegration.
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