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Surface functionalization of nanoporous alumina with bone morphogenetic protein 2 for inducing osteogenic differentiation of mesenchymal stem cells

机译:骨形态发生蛋白2对纳米多孔氧化铝的表面功能化诱导间充质干细胞的成骨分化

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Many studies have demonstrated the possibility to regulate cellular behavior by manipulating the specific characteristics of biomaterials including the physical features and chemical properties. To investigate the synergistic effect of chemical factors and surface topography on the growth behavior of mesenchymal stem cells (MSCs), bone morphorgenic protein 2 (BMP2) was immobilized onto porous alumina substrates with different pore sizes. The BMP2-immobilized alumina substrates were characterized with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Growth behavior and osteogenic differentiation of MSCs cultured on the different substrates were investigated. Cell adhesion and morphological changes were observed with SEM, and the results showed that the BMP2-immobilized alumina substrate was able to promote adhesion and spreading of MSCs. MTT assay and immunofluorescence staining of integrin β1 revealed that the BMP2-immobilized alumina substrates were favorable for cell growth. To evaluate the differentiation of MSCs, osteoblastic differentiation markers, such as alkaline phosphatase (ALP) activity and mineralization, were investigated. Compared with those of untreated alumina substrates, significantly higher ALP activities and mineralization were detected in cells cultured on BMP2-immobilized alumina substrates. The results suggested that surface functionalization of nanoporous alumina substrates with BMP2 was beneficial for cell growth and osteogenic differentiation. With the approach of immobilizing growth factors onto material substrates, it provided a new insight to exploit novel biofunctional materials for tissue engineering.
机译:许多研究表明,通过操纵生物材料的特定特征(包括物理特征和化学性质)来调节细胞行为的可能性。为了研究化学因子和表面形貌对间充质干细胞(MSCs)生长行为的协同作用,将骨形态发生蛋白2(BMP2)固定在具有不同孔径的多孔氧化铝基质上。通过扫描电子显微镜(SEM)和X射线光电子能谱(XPS)对BMP2固定的氧化铝基材进行了表征。研究了在不同底物上培养的MSC的生长行为和成骨分化。扫描电镜观察细胞粘附和形态变化,结果表明,BMP2固定的氧化铝基质能够促进MSCs的粘附和扩散。 MTT分析和整联蛋白β1的免疫荧光染色显示,BMP2固定的氧化铝底物有利于细胞生长。为了评估MSC的分化,研究了成骨细胞分化标记,例如碱性磷酸酶(ALP)的活性和矿化作用。与未经处理的氧化铝基材相比,在固定有BMP2的氧化铝基材上培养的细胞中检测到明显更高的ALP活性和矿化作用。结果表明用BMP2对纳米多孔氧化铝基质进行表面功能化对细胞生长和成骨分化是有益的。通过将生长因子固定在材料基质上的方法,它为开发用于组织工程的新型生物功能材料提供了新的见解。

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