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Evaluation of polyelectrolyte complex-based scaffolds for mesenchymal stem cell therapy in cardiac ischemia treatment.

机译:基于聚电解质复合的支架对心肌缺血治疗中的间充质干细胞疗法的评价。

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摘要

Three-dimensional (3D) scaffolds hold great potential for stem cell-based therapies. Indeed, recent results have shown that biomimetic scaffolds may enhance cell survival and promote an increase in the concentration of therapeutic cells at the injury site. The aim of this work was to engineer an original polymeric scaffold based on the respective beneficial effects of alginate and chitosan. Formulations were made from various alginate/chitosan ratios to form opposite-charge polyelectrolyte complexes (PECs). After freeze-drying, the resultant matrices presented a highly interconnected porous microstructure and mechanical properties suitable for cell culture. In vitro evaluation demonstrated their compatibility with mesenchymal stell cell (MSC) proliferation and their ability to maintain paracrine activity. Finally, the in vivo performance of seeded 3D PEC scaffolds with a polymeric ratio of 40/60 was evaluated after an acute myocardial infarction provoked in a rat model. Evaluation of cardiac function showed a significant increase in the ejection fraction, improved neovascularization, attenuated fibrosis as well as less left ventricular dilatation as compared to an animal control group. These results provide evidence that 3D PEC scaffolds prepared from alginate and chitosan offer an efficient environment for 3D culturing of MSCs and represent an innovative solution for tissue engineering.
机译:三维(3D)支架对基于干细胞的疗法保持巨大潜力。实际上,最近的结果表明,仿生支架可以增强细胞存活,促进损伤部位的治疗细胞浓度的增加。这项工作的目的是根据藻酸盐和壳聚糖的各自有益效果来工程师工程师。由各种藻酸盐/壳聚糖比例制备的制剂,形成相反电荷的聚电解质配合物(PEC)。在冷冻干燥后,所得基质呈现出高度相互连接的多孔微观结构和适于细胞培养的机械性能。体外评估证明了它们与间充质斑节细胞(MSC)增殖的兼容性及其维持邻racine活性的能力。最后,在大鼠模型激发的急性心肌梗死后评价具有40/60的聚合物比例的种子3D PEC支架的体内性能。与动物对照组相比,心脏功能的评估显示出射血分数,改善新生血管形成,减弱纤维化,减弱的纤维化以及较少的左心室扩张。这些结果提供了由藻酸盐和壳聚糖制备的3D PEC支架提供了一种有效的MSC培养的有效环境,并代表组织工程的创新解决方案。

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