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首页> 外文期刊>Cell and Tissue Research >Regulation of osteogenic and chondrogenic differentiation of mesenchymal stem cells in PEG-ECM hydrogels.
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Regulation of osteogenic and chondrogenic differentiation of mesenchymal stem cells in PEG-ECM hydrogels.

机译:在PEG-ECM水凝胶中调节间充质干细胞的成骨和软骨分化。

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摘要

Bone-marrow-derived mesenchymal stem cells (MSCs) are candidates for regeneration applications in musculoskeletal tissue such as cartilage and bone. Various soluble factors in the form of growth factors and cytokines have been widely studied for directing the chondrogenic and osteogenic differentiation of MSCs, but little is known about the way that the composition of extracellular matrix (ECM) components in three-dimensional microenvironments plays a role in regulating the differentiation of MSCs. To define whether ECM components influence the regulation of osteogenic and chondrogenic differentiation by MSCs, we encapsulated MSCs in poly-(ethylene glycol)-based (PEG-based) hydrogels containing exogenous type I collagen, type II collagen, or hyaluronic acids (HA) and cultured them for up to 6 weeks in chondrogenic medium containing transforming growth factor-beta1 (10 ng/ml) or osteogenic medium. Actin cytoskeleton organization and cellular morphology were strongly dependent on which ECM components were added to the PEG-based hydrogels. Additionally, chondrogenic differentiation of MSCs was marginally enhanced in collagen-matrix-based hydrogels, whereas osteogenic differentiation, as measured by calcium accumulation, was induced in HA-containing hydrogels. Thus, the microenvironments created by exogenous ECM components seem to modulate the fate of MSC differentiation.
机译:骨髓间充质干细胞(MSC)是在骨骼肌肉组织(如软骨和骨骼)中再生应用的候选对象。已经广泛研究了各种可溶因子,以生长因子和细胞因子的形式指导MSC的软骨形成和成骨分化,但对于三维微环境中细胞外基质(ECM)组分的组成起何种作用的方式知之甚少在调节MSC的分化中。为了确定ECM组分是否影响MSC对成骨和软骨形成分化的调节,我们将MSCs封装在含有外源I型胶原蛋白,II型胶原蛋白或透明质酸(HA)的基于聚乙二醇(PEG)的水凝胶中并在含有转化生长因子-β1(10 ng / ml)的成软骨培养基或成骨培养基中培养长达6周。肌动蛋白的细胞骨架组织和细胞形态在很大程度上取决于将哪些ECM成分添加到基于PEG的水凝胶中。另外,在基于胶原蛋白基质的水凝胶中,MSCs的软骨分化略有增强,而通过钙积累测量,在含HA的水凝胶中诱导了成骨分化。因此,外源ECM组件创建的微环境似乎调节MSC分化的命运。

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