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首页> 外文期刊>Acta biomaterialia >PEG-based hydrogels with tunable degradation characteristics to control delivery of marrow stromal cells for tendon overuse injuries.
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PEG-based hydrogels with tunable degradation characteristics to control delivery of marrow stromal cells for tendon overuse injuries.

机译:具有可调节降解特性的PEG基水凝胶,可控制肌腱过度损伤所致的骨髓基质细胞的递送。

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Marrow stromal cells (MSCs) have been suggested as a means to improve healing in tendon overuse injuries (tendinopathy), but optimal delivery methods for these cells have yet to be determined. In this study novel degradable hydrogels based on oligo(poly(ethylene glycol) fumarate) (OPF) and acrylated poly(ethylene glycol)-dithiothreitol (Ac PEG-DTT) with tunable degradation times ranging from a few days to >1 month were synthesized as MSC carriers for tendon overuse injuries. The addition of higher amounts of OPF or higher dithiothreitol (DTT) concentrations resulted in enhanced fold swelling and degradation. Three formulations, including non-degrading, slower degrading (degraded in approximately 10 days) and faster degrading (degraded in approximately 5 days) hydrogels were selected for studies with MSCs in tendon tissue explants that had been treated with collagenase as a reproducible model of tendinopathy. Quantitative analysis of the resulting histology images indicated that cell delivery from the hydrogels was dependent on the degradation rate, with cells present in the tissue only after hydrogel dissolution. In addition, significantly more cells were found in the tendon after 14 days with the fast degrading (53+/-19) vs. slow degrading (20+/-6) hydrogels. Based on these results, OPF/Ac PEG-DTT hydrogels provide a versatile biomaterial platform to control cell delivery and thus better identify dosing regimens required for MSC-based therapies for tendinopathy.
机译:有人建议将骨髓基质细胞(MSC)作为改善肌腱过度使用损伤(tendinopathy)愈合的手段,但尚未确定这些细胞的最佳递送方法。在这项研究中,合成了基于低聚(聚乙二醇富马酸酯)(OPF)和丙烯酸化聚(乙二醇)-二硫苏糖醇(Ac PEG-DTT)的新型可降解水凝胶,其降解时间范围从几天到大于1个月不等。作为MSC承运人的肌腱过度使用伤害。添加更多量的OPF或更高浓度的二硫苏糖醇(DTT)会导致倍增的膨胀和降解。选择了三种配方,包括非降解,降解速度较慢(约10天降解)和降解速度较快(约5天降解)水凝胶,用于在肌腱组织外植体中用MSCs进行研究,这些胶原酶已作为胶原蛋白病的可再现模型进行了处理。对所得组织学图像的定量分析表明,水凝胶中的细胞传递取决于降解速率,细胞仅在水凝胶溶解后才存在于组织中。另外,在14天后,快速降解(53 +/- 19)与缓慢降解(20 +/- 6)的水凝胶相比,在肌腱中发现了更多的细胞。基于这些结果,OPF / Ac PEG-DTT水凝胶提供了一个多功能的生物材料平台来控制细胞的递送,从而更好地确定基于肌腱疾病的基于MSC的疗法所需的给药方案。

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