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首页> 外文期刊>Materials science & engineering >Roles of strontium and hierarchy structure on the in vitro biological response and drug release mechanism of the strontium-substituted bioactive glass microspheres
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Roles of strontium and hierarchy structure on the in vitro biological response and drug release mechanism of the strontium-substituted bioactive glass microspheres

机译:锶和层次结构在锶取代生物活性玻璃微球体外生物学应答和药物释放机理中的作用

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摘要

The strontium (Sr) substituted bioactive glasses (BGs) have inimitable advantages for bone generation, but the influences of Sr substitution on bioactivity and biocompatibility are still in debate. A brand novel porous microstructure of Sr-substituted BG microspheres was prepared by an electro-spraying technique combined with phase inversion, in which in vitro biological response (bioactivity, cell viability, alkaline phosphatase (ALP) activity and extracellular matrix (ECM) mineralization) and drug release were clarified in view of physical chemistry and ionic release behavior. The electro sprayed bioactive glass (ESBG) microspheres involved three characteristic pores: < 100 nm, 100-1000 nm and > 1000 nm. The Sr substitution on molar basis hindered the bioactivity of the samples in some extent but the cell behavior of the MC3T3-E1 cells was not significantly discouraged. The drug release profile was also controlled by amount of Sr substitution. However, the porous structure of the microspheres conferred improvement in bioactivity and provided a distinct three-stage drug release mode. Therefore, the Sr substituted ESBG microspheres may provide an effective way to deliver a steady supply of therapeutic ions and drugs in bone implantation patients.
机译:锶(Sr)替代生物活性玻璃(BGs)在骨骼生成方面具有独特的优势,但是Sr替代对生物活性和生物相容性的影响仍存在争议。通过电喷雾技术与相转化结合,制备了一种新型的Sr取代BG微球多孔结构,其体外生物学响应(生物活性,细胞活力,碱性磷酸酶(ALP)活性和细胞外基质(ECM)矿化)考虑到物理化学和离子释放行为,明确了药物的释放和释放。电喷涂生物活性玻璃(ESBG)微球包含三个特征孔:<100 nm,100-1000 nm和> 1000 nm。以摩尔为基础的Sr取代在某种程度上阻碍了样品的生物活性,但并未显着降低MC3T3-E1细胞的细胞行为。药物释放曲线也受Sr取代量的控制。然而,微球的多孔结构赋予了生物活性改善并提供了独特的三阶段药物释放模式。因此,Sr取代的ESBG微球可为在骨植入患者中稳定输送治疗离子和药物提供有效途径。

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