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Sr-doped nanowire modification of Ca-Si-based coatings for improved osteogenic activities and reduced inflammatory reactions

机译:SR掺杂的CA-Si涂层纳米线改性,用于改善的成骨活性和降低的炎症反应

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Biomedical coatings for orthopedic implants should facilitate osseointegration and mitigate implant-induced inflammatory reactions. In our study, Ca-Si coatings with Sr-containing nanowire-like structures (NW-Sr-CS) were achieved via hydrothermal treatment. In order to identify the effect of nanowire-like topography and Sr dopant on the biological properties of Ca-Si-based coatings, the original Ca-Si coating, Ca-Si coatings modified with nanoplate (NP-CS) and similar nanowire-like structure (NW-CS) were fabricated as the control. Surface morphology, phase composition, surface area, zeta potential and ion release of these coatings were characterized. The in vitro osteogenic activities and immunomodulatory properties were evaluated with bone marrow stromal cells (BMSCs) and RAW 264.7 cells, a mouse macrophage cell line. Compared with the CS and NP-CS coatings, the NW-CS coating possessed a larger surface area and pore volume, beneficial protein adsorption, up-regulated the expression levels of integrin beta 1, Vinculin and focal adhesion kinase and promoted cell spreading. Furthermore, the NW-CS coating significantly enhanced the osteogenic differentiation and mineralization as indicated by the up-regulation of ALP activity, mineralized nodule formation and osteoblastogenesis-related gene expression. With the introduction of Sr, the NW-Sr-CS coatings exerted a greater effect on the BMSC proliferation rate, calcium sensitive receptor gene expression as well as PKC and ERK1/2 phosphorylation. In addition, the Sr-doped coatings significantly up-regulated the ratio of OPG/RANKL in the BMSCs. The NW-Sr-CS coatings could modulate the polarization of macrophages towards the wound-healing M2 phenotype, reduce the mRNA expression levels of pro-inflammatory cytokines (TNF-alpha, IL-1 beta, IL-6) and enhance anti-inflammatory cytokines (IL-1ra, IL-10). The Sr-doped nanowire modification may be a valuable approach to enhance osteogenic activities and reduce inflammatory reaction
机译:用于整形外科植入物的生物医学涂层应促进骨整合和减轻植入血液诱导的炎症反应。在我们的研究中,通过水热处理实现了含有Sr的纳米线状结构(NW-SR-CS)的Ca-Si涂层。为了鉴定纳米线形状和Sr掺杂剂对Ca-Si基涂层的生物学性质的影响,用纳米板(NP-CS)改进的Ca-Si涂层,Ca-Si涂层和类似的纳米线状结构(NW-CS)被制成控制。表征了这些涂层的表面形态,相组合物,表面积,ζ电位和离子释放。用骨髓基质细胞(BMSC)和原始264.7细胞,小鼠巨噬细胞系评价体外骨化活性和免疫调节性能。与CS和NP-CS涂层相比,NW-CS涂层具有较大的表面积和孔体积,有益的蛋白质吸附,上调整合蛋白β1,Vinculin和局灶性粘附激酶的表达水平和促进细胞扩散。此外,NW-CS涂层显着提高了成骨分化和矿化,如ALP活性的上调,矿化结节形成和成骨细胞发生相关基因表达所表明。随着SR的引入,NW-SR-CS涂层对BMSC的增殖率,钙敏感受体基因表达以及PKC和ERK1 / 2磷酸化产生了更大的影响。此外,SR掺杂的涂层显着上调了BMSCs中的OPG / RANK1的比例。 NW-SR-CS涂层可以调节巨噬细胞的极化朝向伤口愈合的M2表型,降低促炎细胞因子的mRNA表达水平(TNF-α,IL-1β,IL-6),增强抗炎剂细胞因子(IL-1RA,IL-10)。 SR掺杂的纳米线改性可以是增强成骨活性并降低炎症反应的有价值的方法

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