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TiO 2 nanotubes as drug nanoreservoirs for the regulation of mobility and differentiation of mesenchymal stem cells

机译:TiO 2纳米管作为药物纳米储库,调控间充质干细胞的迁移和分化

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The extracellular microenvironment plays a key role in the regulation of cellular behavior. To mimic the natural extracellular microenvironment, TiO 2 nanotube (TNT) arrays as drug nanoreservoirs for loading of bone morphogenetic protein 2 (BMP2) were constructed on titanium substrates and then covered with multilayered coatings of gelatin/chitosan (Gel/Chi) for controlled drug release. The multilayered coatings were constructed via a spin-assisted layer-by-layer assembly technique. The successful fabrication of this system was monitored by field emission scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy and contact angle measurements. Multilayered coating with Gel/Chi retained the drug bioactivity and release properties, which were revealed by superoxide dismutase activity measurement. In addition, cytoskeleton observation and wound healing assay confirmed that BMP2-loaded and multilayer-coated TNT arrays were able to stimulate motogenic responses of mesenchymal stem cells (MSCs). More importantly, the system demonstrated that it was capable of promoting the osteoblastic differentiation of MSCs. This study may have potential impact on the development of bone implants for enhanced bone osseointegration.
机译:细胞外微环境在调节细胞行为中起关键作用。为了模拟自然的细胞外微环境,在钛基质上构建了TiO 2纳米管(TNT)阵列,作为用于负载骨形态发生蛋白2(BMP2)的药物纳米储库,然后覆盖了明胶/壳聚糖(Gel / Chi)多层涂层作为受控药物发布。通过旋转辅助的逐层组装技术构造多层涂层。通过场发射扫描电子显微镜,原子力显微镜,X射线光电子能谱和接触角测量来监测该系统的成功制造。带有Gel / Chi的多层涂层保留了药物的生物活性和释放特性,这通过超氧化物歧化酶活性的测量得以揭示。此外,细胞骨架观察和伤口愈合试验证实,加载BMP2和多层包被的TNT阵列能够刺激间充质干细胞(MSCs)的致机体反应。更重要的是,该系统证明它能够促进MSC的成骨细胞分化。这项研究可能对增强骨骨整合的骨植入物的发展具有潜在影响。

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