ECM-incorporated hydrogels cross-linked via native chemical ligation to engineer stem cell microenvironments.

ECM-incorporated hydrogels cross-linked via native chemical ligation to engineer stem cell microenvironments.
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DOI:
10.1021/bm400728e
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发表时间:
2013-09-09
期刊:
影响因子:
6.2
通讯作者:
Ogle, Brenda M.
Ogle, Brenda M.
中科院分区:
化学2区
文献类型:
--
作者:
Jung, Jangwook P.;Sprangers, Anthony J.;Byce, John R.;Su, Jing;Squirrell, Jayne M.;Messersmith, Phillip B.;Eliceiri, Kevin W.;Ogle, Brenda M.

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限制全分子细胞外基质(ECM)蛋白对干细胞分化的生物化学影响的精确研究是缺乏可以容纳许多不同类型的ECM的3D体外模型。在这里,我们试图产生这样的系统,同时保持一致的机械性能和支持干细胞存活。为此,我们使用天然化学连接在温和条件下交联聚(乙二醇)大分子单体,同时截留ECM蛋白(称为ECM复合物)和干细胞。使用足够低浓度的ECM来维持恒定的储能模量和孔径。复合材料中干细胞的活力维持了数周。复合材料的ECM包含干细胞,并根据ECM类型指导不同结构的形成。因此,我们引入了一种强大的方法来研究多种ECM蛋白(单独或组合)对干细胞行为的生化影响。
Limiting the precise study of the biochemical impact of whole molecule extracellular matrix (ECM) proteins on stem cell differentiation is the lack of 3D in vitro models that can accommodate many different types of ECM. Here we sought to generate such a system while maintaining consistent mechanical properties and supporting stem cell survival. To this end, we used native chemical ligation to crosslink poly(ethylene glycol) macromonomers under mild conditions while entrapping ECM proteins (termed ECM composites) and stem cells. Sufficiently low concentrations of ECM were used to maintain constant storage moduli and pore size. Viability of stem cells in composites was maintained over multiple weeks. ECM of composites encompassed stem cells and directed the formation of distinct structures dependent on ECM type. Thus, we introduce a powerful approach to study the biochemical impact of multiple ECM proteins (either alone or in combination) on stem cell behavior.
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