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Nanofiber alignment regulates adhesion and integrin expression of human mesenchymal stem cells and tendon fibroblasts

机译:纳米纤维排列调节人间充质干细胞和肌腱成纤维细胞的黏附和整联蛋白表达

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Rotator cuff tears are among the most common shoulder injuries that require surgery. High failure rates of biological graft-based repairs underscore the need for functional alternatives. In this study, effects of nanofiber organization on adhesion of cuff fibroblasts (hRCF) and human mesenchymal stem cells (hMSC) are evaluated. It is hypothesized that fiber alignment will regulate cell morphology and integrin gene expression. hRCF and hMSC were seeded on aligned and unaligned nanofiber scaffolds of polylactide-co-glycolide. Cell morphology (n=3) and gene expression (n=5) for integrins ¿2, ¿V, ¿5, and ß1 were determined over 14 days. Cell morphology was found to differ between groups. Higher ¿2 and ß1 expressions in hRCF and hMSC on aligned scaffolds suggest aligned scaffolds a more biomimetic structure to native tendon, since integrin ¿2ß1 facilitates cell attachment to collagenous matrices. Expressions for ¿V and ¿5, which are associated with tendon healing, were significantly higher on unaligned scaffolds, and suggest a healing response by the cells. In conclusion, the cells may recognize differences in matrix organization, and fiber alignment regulates cell adhesion. Moreover, the aligned nanofiber matrix may promote a more biomimetic fibroblast response than the unaligned scaffold.
机译:肩袖撕裂是需要手术的最常见的肩部受伤之一。基于生物移植物的修复的高失败率凸显了对功能替代产品的需求。在这项研究中,评估了纳米纤维组织对袖带成纤维细胞(hRCF)和人间充质干细胞(hMSC)粘附的影响。据推测,纤维排列将调节细胞形态和整联蛋白基因表达。将hRCF和hMSC接种在聚乳酸-乙交酯共聚物的对齐和未对齐的纳米纤维支架上。细胞形态(n = 3)和基因表达(n = 5)的整合素β,β,β,β,β,β,γ,β5和γ ƒÂŸ1被确定在14天内。发现各组之间的细胞形态不同。对齐支架上的hRCF和hMSC中较高的ƒÂ,‚¿2和ƒƒƒÃ‚Ÿ1表达表明,由于整合素ƒƒÂ‚¿2à ƒÂƒÂŸ1促进细胞附着在胶原蛋白基质上。与肌腱愈合相关的ƒƒ‚‚¿ V和ƒƒÂ‚ 5的表达在未对齐的支架上明显更高,并提示细胞的治愈反应。总之,细胞可以识别基质组织的差异,并且纤维排列调节细胞粘附。此外,对齐的纳米纤维基质比未对齐的支架可以促进更多的仿生成纤维细胞反应。

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