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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Design and testing of a cyclic stretch and flexure bioreactor for evaluating engineered heart valve tissues based on poly(glycerol sebacate) scaffolds
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Design and testing of a cyclic stretch and flexure bioreactor for evaluating engineered heart valve tissues based on poly(glycerol sebacate) scaffolds

机译:循环拉伸和弯曲生物反应器的设计和测试,用于评估基于聚癸二酸甘油支架的工程心脏瓣膜组织

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摘要

Cyclic flexure and stretch are essential to the function of semilunar heart valves and have demonstrated utility in mechanically conditioning tissue-engineered heart valves. In this study, a cyclic stretch and flexure bioreactor was designed and tested in the context of the bioresorbable elastomer poly(glycerol sebacate). Solid poly(glycerol sebacate) membranes were subjected to cyclic stretch, and micromolded poly(glycerol sebacate) scaffolds seeded with porcine aortic valvular interstitial cells were subjected to cyclic stretch and flexure. The results demonstrated significant effects of cyclic stretch on poly(glycerol sebacate) mechanical properties, including significant decreases in effective stiffness versus controls. In valvular interstitial cell-seeded scaffolds, cyclic stretch elicited significant increases in DNA and collagen content that paralleled maintenance of effective stiffness. This work provides a basis for investigating the roles of mechanical loading in the formation of tissue-engineered heart valves based on elastomeric scaffolds.
机译:循环弯曲和拉伸对于半月形心脏瓣膜的功能至关重要,并且在机械调节组织工程化心脏瓣膜方面已显示出实用性。在这项研究中,在生物可吸收弹性体聚癸二酸甘油酯的背景下,设计并测试了循环拉伸和挠曲生物反应器。对固体聚癸二酸甘油酯膜进行循环拉伸,并用猪主动脉瓣膜间质细胞接种的微模制聚癸二酸甘油酯支架进行循环拉伸和弯曲。结果表明,循环拉伸对聚癸二酸甘油酯的机械性能有显着影响,包括与对照相比,有效刚度显着降低。在瓣膜间质细胞播种的支架中,循环拉伸引起DNA和胶原蛋白含量的显着增加,与维持有效刚度相平行。这项工作为研究机械负荷在基于弹性支架的组织工程化心脏瓣膜的形成中的作用提供了基础。

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