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首页> 外文期刊>Biomaterials Science >Synergistic effect of released dexamethasone and surface nanoroughness on mesenchymal stem cell differentiation
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Synergistic effect of released dexamethasone and surface nanoroughness on mesenchymal stem cell differentiation

机译:地塞米松释放与表面纳米粗糙度对间充质干细胞分化的协同作用

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Stem cells can alter their shapes and functions in response to the physical cues at the cell-substrate interface or the chemical signals in the culture environment. In this study, the surface nanoroughness, as a physical cue in the form of the beads-on-string features on polymer nanofibers, was fabricated through an electrospinning technology, and simultaneously dexamethasone (DEX), an osteogenic differentiation factor as a chemical signal, was incorporated into these nanofibers during this process. The morphology of the DEX-loaded nanofibers was observed with scanning electron microscopy (SEM). In vitro DEX release was carried out in PBS over a period of 29 days. The combination of the physical and chemical signals was also used to investigate the differentiation capability of rat bone marrow mesenchymal stem cells (rBMSCs) through SEM and fluorescence microscopy observation, alkaline phosphatase (ALP) activity assay, Alizarin Red S staining, quantification of mineral deposition and quantitative real-time PCR analysis. The results indicate that the DEX gradually released into the culture medium played a dominant role in promoting rBMSCs' differentiation towards osteoblast-like cells, and the surface nanoroughness could play a supporting role in the differentiation. Therefore, this DEX-loaded polymer nanofiber scaffold with moderate surface nanoroughness has great potential application in bone tissue regeneration.
机译:干细胞可以响应细胞-底物界面上的物理提示或培养环境中的化学信号来改变其形状和功能。在这项研究中,表面纳米粗糙度是通过静电纺丝技术制成的,以聚合物纳米纤维上串珠状形式的物理提示形式出现,并同时通过地塞米松(DEX)(一种成骨分化因子作为化学信号)制成,在此过程中,被掺入到这些纳米纤维中。用扫描电子显微镜(SEM)观察了DEX负载的纳米纤维的形态。在PBS中进行了29天的体外DEX释放。物理和化学信号的组合还用于通过SEM和荧光显微镜观察,碱性磷酸酶(ALP)活性测定,茜素红S染色,矿物质沉积的定量研究大鼠骨髓间充质干细胞(rBMSCs)的分化能力和定量实时PCR分析。结果表明,逐渐释放到培养基中的DEX在促进rBMSCs向成骨样细胞的分化中起主导作用,并且表面纳米粗糙度可能在该分化中起辅助作用。因此,这种具有中等表面纳米粗糙度的DEX负载聚合物纳米纤维支架在骨组织再生中具有巨大的潜在应用。

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