A self-healing hydrogel as an injectable instructive carrier for cellular morphogenesis.

A self-healing hydrogel as an injectable instructive carrier for cellular morphogenesis.
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DOI:
10.1016/j.biomaterials.2018.09.003
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发表时间:
2018-12
期刊:
影响因子:
14
通讯作者:
Gerecht S
Gerecht S
中科院分区:
工程技术1区
文献类型:
--
作者:
Wei Z;Gerecht S

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祖细胞移植可加速组织愈合和再生过程。然而,由于血管系统和组织状况受损,直接细胞递送无法支持移植细胞的存活或血管相关疾病的长期治疗。使用可注射的原位交联水凝胶可以在体内保护细胞,但它们的溶胶-凝胶转变是时间依赖性的,难以精确控制。具有自修复特性的水凝胶被提出来解决这些限制,但目前的自修复水凝胶缺乏生物功能,阻碍了输送细胞进入组织结构的形态发生。在这里,我们建立了一种由氧化葡聚糖交联的明胶(Gtn)为基础的自愈水凝胶,作为内皮祖细胞递送的可注射载体。Gtn和Odex之间的动态亚胺交联赋予Gtn-l-Odex水凝胶在注射器注射后的自愈能力。自我修复的Gtn-l-Odex不仅可以保护祖细胞免受注入剪切力的影响,而且还可以控制细胞的空间/时间位置。此外,由于Gtn的细胞粘附和蛋白水解位点,Gtn-l- odex水凝胶在体外和体内均支持内皮祖细胞形成复杂的血管网络。这是首次报道具有促进血管形态发生的生物特性的可注射的、自愈的水凝胶,这对加速再生疗法的成功具有很大的希望。
Transplantation of progenitor cells can accelerate tissue healing and regenerative processes. Nonetheless, direct cell delivery fails to support survival of transplanted cells or long-term treatment of vascular related diseases due to compromised vasculature and tissue conditions. Using injectable hydrogels that cross-link in situ, could protect cells in vivo, but their sol-gel transition is time-dependent and difficult to precisely control. Hydrogels with self-healing properties are proposed to address these limitations, yet current self-healing hydrogels lack bio-functionality, hindering the morphogenesis of delivered cells into a tissue structure. Here we establish a gelatin (Gtn)-based self-healing hydrogel cross-linked by oxidized dextran (Odex) as an injectable carrier for delivery of endothelial progenitors. The dynamic imine cross-links between Gtn and Odex confer the self-healing ability to the Gtn-l-Odex hydrogels following syringe injection. The self-healing Gtn-l-Odex not only protects the progenitors from injected shear force but it also allows controllable spatial/temporal placement of the cells. Moreover, owing to the cell-adhesive and proteolytic sites of Gtn, the Gtn-l-Odex hydrogels support complex vascular network formation from the endothelial progenitors, both in vitro and in vivo. This is the first report of injectable, self-healing hydrogels with biological properties promoting vascular morphogenesis, which holds great promise for accelerating the success of regenerative therapies.
具有抗菌活性的自愈导电注射水凝胶作为心脏细胞治疗的细胞递送载体
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发表时间: 2016-07-13
影响因子: 9.5
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发表时间: 1980-01-01
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影响因子: --
作者:
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