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Microgel Thin Film Loss Tangent and Substrate Elasticity Direct Cell Spreading and Migration Responses

机译:微凝胶薄膜的损耗角正切和基底弹性,直接细胞扩散和迁移响应

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Analysis of cell migration, morphology, and protein expression showed that by changing surface loss tangent, through alteration in microgel crosslinking density, fibroblast mode of migration and fibrotic associated responses can be controlled. When the films are built on glass, high loss tangent films led to ameboid migration and low fibrotic responses, while low loss tangent films lead to mesenchymal migration and higher fibrotic responses. It was also observed that as loss tangent decreased cell internal stiffness increased. However, when microgel films are built on substrates of different stiffness values, cellular responses are altered. It was seen that on 9 kPa gels, the cells responded differently than on glass and were found to have increased fibrotic responses on higher loss tangent films. However, TFM results appeared to match cell stiffness mapping, as higher traction forces were measured as loss tangent decreased on the 9 kPa gels. These results indicate that it is important to take into consideration both the surface viscoelastic properties and elastic properties of the bulk substrate on which cells are seeded. These results also show the potential of this microgel/PA gel platform for creating substrates that mimic the complex mechanics of biological tissues.
机译:细胞迁移,形态和蛋白质表达的分析表明,通过改变表面损失切线,通过改变微凝胶交联密度,可以控制成纤维细胞的迁移模式和纤维化相关反应。当将膜构建在玻璃上时,高损耗正切膜会导致类风湿迁移和低纤维化反应,而低损耗正切膜会导致间充质迁移和更高的纤维化反应。还观察到,随着损耗角正切降低,细胞内部刚度增加。但是,当将微凝胶膜构建在不同硬度值的基材上时,细胞反应就会改变。可以看出,在9 kPa凝胶上,细胞的反应与在玻璃上的反应不同,并且发现在损耗角正切更高的膜上,纤维化反应增强了。但是,当在9 kPa凝胶上损失切线减少时,由于测量到较高的牵引力,因此TFM结果似乎与细胞刚度图匹配。这些结果表明,重要的是要考虑在其上接种细胞的块状基底的表面粘弹性和弹性性质。这些结果还显示了这种微凝胶/ PA凝胶平台在创建模仿生物组织复杂机制的底物方面的潜力。

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