首页> 外文期刊>Acta biomaterialia >Evaluation of polyelectrolyte complex-based scaffolds for mesenchymal stem cell therapy in cardiac ischemia treatment.
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Evaluation of polyelectrolyte complex-based scaffolds for mesenchymal stem cell therapy in cardiac ischemia treatment.

机译:评价基于聚电解质复合物的支架在心肌缺血治疗中的间充质干细胞治疗。

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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)支架在基于干细胞的疗法中具有巨大的潜力。实际上,最近的结果表明,仿生支架可以增强细胞存活并促进损伤部位治疗细胞的浓度增加。这项工作的目的是根据藻酸盐和壳聚糖各自的有益效果,设计出一种原始的聚合物支架。由各种藻酸盐/壳聚糖比例制成制剂,以形成带相反电荷的聚电解质复合物(PEC)。冷冻干燥后,所得基质呈现出高度互连的多孔微结构和适合细胞培养的机械性能。体外评估证明了它们与间充质星状细胞(MSC)增殖的相容性以及它们维持旁分泌活性的能力。最后,在大鼠模型中引发急性心肌梗死后,评估聚合物比率为40/60的接种3D PEC支架的体内性能。与动物对照组相比,心功能评估显示射血分数显着增加,新血管形成改善,纤维化减弱以及左心室扩张减少。这些结果提供了证据,表明由藻酸盐和壳聚糖制备的3D PEC支架为MSC的3D培养提供了有效的环境,并且代表了组织工程的创新解决方案。

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