首页> 外文期刊>American Journal of Physiology >Tissue engineering of functional cardiac muscle: molecular, structural, and electrophysiological studies.
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Tissue engineering of functional cardiac muscle: molecular, structural, and electrophysiological studies.

机译:功能性心肌的组织工程:分子,结构和电生理研究。

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摘要

The primary aim of this study was to relate molecular and structural properties of in vitro reconstructed cardiac muscle with its electrophysiological function using an in vitro model system based on neonatal rat cardiac myocytes, three-dimensional polymeric scaffolds, and bioreactors. After 1 wk of cultivation, we found that engineered cardiac muscle contained a 120- to 160-microm-thick peripheral region with cardiac myocytes that were electrically connected through gap junctions and sustained macroscopically continuous impulse propagation over a distance of 5 mm. Molecular, structural, and electrophysiological properties were found to be interrelated and depended on specific model system parameters such as the tissue culture substrate, bioreactor, and culture medium. Native tissue and the best experimental group (engineered cardiac muscle cultivated using laminin-coated scaffolds, rotating bioreactors, and low-serum medium) were comparable with respect to the conduction velocity of propagated electrical impulses and spatial distribution of connexin43. Furthermore, the structural and electrophysiological properties of the engineered cardiac muscle, such as cellularity, conduction velocity, maximum signal amplitude, capture rate, and excitation threshold, were significantly improved compared with our previous studies.
机译:这项研究的主要目的是使用基于新生大鼠心肌细胞,三维聚合物支架和生物反应器的体外模型系统,将体外重建的心肌的分子和结构特性与其电生理功能相关联。培养1周后,我们发现工程化的心肌包含120至160微米厚的周边区域,其心肌细胞通过间隙连接电连接并在5 mm的距离内持续宏观连续脉冲传播。发现分子,结构和电生理特性是相互关联的,并取决于特定的模型系统参数,例如组织培养底物,生物反应器和培养基。就传播的电脉冲的传导速度和连接蛋白的空间分布而言,天然组织和最佳实验组(使用层粘连蛋白涂层支架,旋转生物反应器和低血清培养基培养的工程心肌)具有可比性。此外,与我们以前的研究相比,工程化心肌的结构和电生理特性,例如细胞密度,传导速度,最大信号幅度,捕获率和激发阈值,得到了显着改善。

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