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首页> 外文期刊>Journal of tissue engineering and regenerative medicine >MgCHA particles dispersion in porous PCL scaffolds: In vitro mineralization and in vivo bone formation
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MgCHA particles dispersion in porous PCL scaffolds: In vitro mineralization and in vivo bone formation

机译:MgCHA颗粒分散在多孔PCL支架中:体外矿化和体内骨形成

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In this work, we focus on the in vitro and in vivo response of composite scaffolds obtained by incorporating Mg,CO3-doped hydroxyapatite (HA) particles in poly(ε-caprolactone) (PCL) porous matrices. After a complete analysis of chemical and physical properties of synthesized particles (i.e. SEM/EDS, DSC, XRD and FTIR), we demonstrate that the Mg,CO3 doping influences the surface wettability with implications upon cell-material interaction and new bone formation mechanisms. In particular, ion substitution in apatite crystals positively influences the early in vitro cellular response of human mesenchymal stem cells (hMSCs), i.e. adhesion and proliferation, and promotes an extensive mineralization of the scaffold in osteogenic medium, thus conforming to a more faithful reproduction of the native bone environment than undoped HA particles, used as control in PCL matrices. Furthermore, we demonstrate that Mg,CO3-doped HA in PCL scaffolds support the in vivo cellular response by inducing neo-bone formation as early as 2months post-implantation, and abundant mature bone tissue at the sixth month, with a lamellar structure and completely formed bone marrow. Together, these results indicate that Mg2+ and CO3 2- ion substitution in HA particles enhances the scaffold properties, providing the right chemical signals to combine with morphological requirements (i.e. pore size, shape and interconnectivity) to drive osteogenic response in scaffold-aided bone regeneration.
机译:在这项工作中,我们专注于通过将Mg,CO3掺杂的羟基磷灰石(HA)颗粒掺入聚(ε-己内酯)(PCL)多孔基质中获得的复合支架的体外和体内反应。在对合成颗粒的化学和物理性质(即SEM / EDS,DSC,XRD和FTIR)进行了全面分析之后,我们证明了Mg,CO3掺杂会影响表面润湿性,从而影响细胞-材料相互作用和新的骨形成机制。尤其是,磷灰石晶体中的离子取代对人间充质干细胞(hMSCs)的早期体外细胞应答(即粘附和增殖)产生积极影响,并促进成骨培养基中支架的广泛矿化,从而符合更忠实地复制天然骨骼环境比未掺杂的HA颗粒,在PCL矩阵中用作对照。此外,我们证明PCL支架中掺有Mg,CO3的HA通过在植入后2个月内诱导新骨形成并在第6个月形成丰富的成熟骨组织(具有片状结构)而完全支持体内细胞反应形成了骨髓。总之,这些结果表明,HA颗粒中的Mg2 +和CO3 2-离子取代增强了支架的性能,提供了正确的化学信号以与形态学要求(即孔径,形状和互连性)结合在一起,以驱动支架辅助骨再生中的成骨反应。

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