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Biomineralized polysaccharide capsules for encapsulation, organization, and delivery of human cell types and growth factors

机译:生物矿化的多糖胶囊,用于封装,组织和输送人类细胞类型和生长因子

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摘要

The construction of biomimetic microenvironments with specific chemical and physical cues for the organization and modulation of a variety of cell populations is of key importance in tissue engineering. We show that a range of human cell types, including promyoblasts, chondrocytes, adipocytes, adenovirally transduced osteoprogenitors, immunoselected mesenchymal stem cells, and the osteogenic factor, rhBMP-2 (BMP: bone morphogenic protein), can be successfully encapsulated within mineralized polysaccharide capsules without loss of function in vivo. By controlling the extent of mineralization within the alginate/chitosan shell membrane, degradation of the shell wall and release of cells or rhBMP-2 into the surrounding medium can be regulated. In addition, we describe for the first time the ability to generate bead-in-bead capsules consisting of spatially separated cell populations and temporally separated biomolecule release, entrapped within alginate/chitosan shells of variable thickness mineralization, and stability. Such materials offer significant potential as multifunctional scaffolds and delivery vehicles in tissue regeneration of hard and soft tissues.
机译:在组织工程中,具有特定化学和物理线索的仿生微环境的构建对组织和调节各种细胞群具有特定的线索,这是至关重要的。我们显示了一系列人类细胞类型,包括原核细胞,软骨细胞,脂肪细胞,腺病毒转导的骨祖细胞,免疫选择的间充质干细胞和成骨因子rhBMP-2(BMP:骨形态发生蛋白),可以成功地封装在矿化的多糖胶囊中而不会丧失体内功能。通过控制藻酸盐/壳聚糖壳膜内的矿化程度,可以调节壳壁的降解以及细胞或rhBMP-2向周围介质的释放。此外,我们首次描述了由空间上分离的细胞群体和时间上分离的生物分子释放,包埋在具有可变厚度矿化作用的藻酸盐/壳聚糖壳中和稳定性组成的珠中珠胶囊的能力。这样的材料在硬组织和软组织的组织再生中具有作为多功能支架和递送载体的巨大潜力。

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