骨组织修复支架的材料特性决定了材料与组织或细胞之间的相互作用。它们之间在纳米尺度上的界面可以调节细胞粘附、迁移和分化行为,从而重塑材料的成骨特性。本研究采用溶胶-凝胶技术和主动自组装技术制备了一系列3 nm、8 nm和20 nm介孔生物活性玻璃支架(MSX-3、MSX-8和MSX-20),并以介孔生物玻璃为载体。作为矩阵。然后,我们进一步研究了不同介孔孔径对支架材料生物学的影响以及成骨特性的影响。制备的多级微纳结构骨修复支架均具有~300 μm大孔,具有良好的生物相容性和矿化活性。矿化实验证明,MSX-3和MSX-8支架表面沉积了大量的钙盐和磷酸盐,而MSX-20对溶液中的蛋白质等有机化合物有明显的吸附/沉积作用。 MSX-20多级微纳结构骨修复支架能够显着促进BMSCs的细胞粘附,且细胞铺展面积明显大于MSX-3和MSX-8支架。 MSX-20多级微纳结构骨修复支架对BMP-2具有良好的缓释作用,可促进BMP-2对BMSCs的成骨分化作用。动物实验还表明,负载BMP-2的MSX-20可以显着促进成骨。这些发现表明,当中孔孔径为20 nm时,由于干细胞粘附增强和BMP-2更持续释放,支架更能促进骨再生。
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The effect of pore size on cell behavior in mesoporous bioglass scaffolds for bone regeneration
The material properties of bone tissue repair scaffolds dictate the interaction between the material and tissues or cells . The interface between them at the nanoscale can regulate cell adhesion, migration, and differentiation behaviors, thereby reshaping osteogenic properties of the material . In this study, a series of 3 nm, 8 nm and 20 nm mesoporous bioactive glass scaffolds (MSX-3, MSX-8 and MSX-20) were prepared by employing sol-gel technique and active self-assembly, with mesoporous bioglass serving as matrix. We then further examined effects of different mesopore pore sizes on the material biology of scaffolds and effects of osteogenic properties both and . The prepared multi-level micro-nano-structured bone repair scaffolds all had ∼300 μm macropores and possessed good biocompatibility and mineralizing activity. mineralization experiments proved that a large amount of calcium and phosphate salts were deposited on the surfaces of MSX-3 and MSX-8 scaffolds, while MSX-20 had conspicuous adsorption/deposition effects on organic compounds such as proteins in solution. MSX-20 multi-level micro-nano-structured bone repair scaffold could significantly promote the cell adhesion of BMSCs, and the cell spreading area was significantly larger than that of MSX-3 and MSX-8 scaffolds. MSX-20 multi-level micro-nano structured bone repair scaffold had a good sustained release effect on BMP-2, which could promote the osteogenic differentiation effect of BMP-2 on BMSCs. animal experiments also showed that MSX-20 loaded with BMP-2 could significantly promote osteogenesis. These findings suggest that when the mesopore pore size is 20 nm, the scaffold can be more conductive to bone regeneration due to the enhanced adhesion of stem cells and more sustained release of BMP-2.