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Biomaterials:系特异性外泌体可以超越细胞外基质介导的人间充质干细胞分化

2018-09-02 MedSci MedSci原创

谱系规范是干细胞命运,组织稳态和发育的重要过程。微环境线索提供直接和选择性的外在信号来调节干细胞的谱系规格。微环境环境由两个基本组成部分组成,一个是细胞外基质(ECM)作为基质,而另一个是细胞分泌的外泌体和生长因子。分化细胞的ECM调节干细胞的表型表达,而它们的外泌体含有控制干细胞分化的表型特异性指导因子(miRNA,RNA和蛋白质)。该研究表明,成骨细胞衍生的(Os-Exo)和脂肪细胞衍生的(A

谱系规范是干细胞命运,组织稳态和发育的重要过程。微环境线索提供直接和选择性的外在信号来调节干细胞的谱系规格。微环境环境由两个基本组成部分组成,一个是细胞外基质(ECM)作为基质,而另一个是细胞分泌的外泌体和生长因子。分化细胞的ECM调节干细胞的表型表达,而它们的外泌体含有控制干细胞分化的表型特异性指导因子(miRNA,RNA和蛋白质)。

该研究表明,成骨细胞衍生的(Os-Exo)和脂肪细胞衍生的(Ad-Exo)外泌体含有调节人间充质干细胞(hMSCs)谱系规范的指导因子。外泌体分析揭示了成骨细胞(RUNX2和OSX)和脂肪细胞(C/EBPα和PPARγ)的RNA和蛋白质形式的转录因子的存在。此外,在这些外泌体中也鉴定了几种据报道具有成骨和成脂分化潜能的miRNA。

动力学和分化分析表明成骨细胞和脂肪细胞外泌体均增强ECM介导的hMSCs分化成各自的谱系。与单独使用的相应ECM或外泌体相比,成骨细胞/脂肪细胞ECM和外泌体的组合在较早的分化时间点上打开谱系特异性基因表达。有趣的是,成骨细胞ECM与脂肪形成外泌体分化的hMSCs显示脂肪形成谱系基因的表达,而脂肪细胞ECM与成骨细胞外泌体分化的hMSCs显示成骨谱系基因。

基于这些观察结果,我们得出结论,在hMSCs的谱系规范期间,外泌体可能会超越ECM介导的指导信号。

原始出处:

Narayanan K, Kumar S, et al., Lineage-specific exosomes could override extracellular matrix mediated human mesenchymal stem cell differentiation. Biomaterials. 2018 Aug 11;182:312-322. doi: 10.1016/j.biomaterials.2018.08.027.

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    2018-11-29 一叶知秋
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    2018-09-12 1e145228m78(暂无匿称)

    学习了,谢谢作者分享!

    0

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