首页> 外文期刊>Acta biomaterialia >Optimizing the structure and contractility of engineered skeletal muscle thin films.
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Optimizing the structure and contractility of engineered skeletal muscle thin films.

机译:优化工程化骨骼肌薄膜的结构和收缩性。

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An experimental system was developed to tissue engineer skeletal muscle thin films with well-defined tissue architecture and to quantify the effect on contractility. Using the C2C12 cell line, the authors tested whether tailoring the width and spacing of micropatterned fibronectin lines can be used to increase myoblast differentiation into functional myotubes and maximize uniaxial alignment within a 2-D sheet. Using a combination of image analysis and the muscular thin film contractility assay, it was demonstrated that a fibronectin line width of 100μm and line spacing of 20μm is able to maximize the formation of anisotropic, engineered skeletal muscle with consistent contractile properties at the millimeter length scale. The engineered skeletal muscle exhibited a positive force-frequency relationship, could achieve tetanus and produced a normalized peak twitch stress of 9.4±4.6kPa at 1Hz stimulation. These results establish that micropatterning technologies can be used to control skeletal muscle differentiation and tissue architecture and, in combination with the muscular thin film contractility, assay can be used to probe structure-function relationships. More broadly, an experimental platform is provided with the potential to examine how a range of microenvironmental cues such as extracellular matrix protein composition, micropattern geometries and substrate mechanics affect skeletal muscle myogenesis and contractility.
机译:开发了一个实验系统,用于组织工程化具有明确组织结构的骨骼肌薄膜,并量化其对收缩力的影响。使用C2C12细胞系,作者测试了调整微图案化纤连蛋白系的宽度和间距是否可用于增加成肌细胞分化为功能性肌管,并使二维片内的单轴排列最大化。结合图像分析和肌肉薄膜收缩性测定,结果表明,纤连蛋白线宽为100μm,线间距为20μm,能够最大程度地形成各向异性的工程骨骼肌,并在毫米长的尺度上具有一致的收缩特性。工程骨骼肌表现出正的力-频率关系,可以达到破伤风,并在1Hz刺激下产生9.4±4.6kPa的标准化峰值抽搐应力。这些结果表明,微模式技术可用于控制骨骼肌的分化和组织结构,并结合肌肉薄膜的收缩性,可用于检测结构与功能的关系。更广泛地讲,提供了一个实验平台,它有可能检查一系列微环境线索,例如细胞外基质蛋白组成,微模式几何形状和底物力学如何影响骨骼肌的肌生成和收缩能力。

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