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ECM–oligourethene–silica hydrogels as a local drug release system of dexamethasone for stimulating macrophages

机译:ECM-低聚尿烷-二氧化硅水凝胶作为地塞米松的局部药物释放系统,用于刺激巨噬细胞

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Hydrogels based on an extracellular matrix (ECM) capable of delivering therapeutics in a controlled manner represent a platform to guide tissue regeneration. This work reports a novel approach wherein the incorporation of silica particles (SiP) inside ECM hydrogels supports the loading and releasing of dexamethasone (Dex). The biocomposite hydrogels, derived from porcine small intestine submucosa (SIS), water-soluble oligourethanes (PPU synthetized from polyethylene glycol and hexamethylene-diisocyanate) and SiP, delivered Dex at pH 7.4 and 37 °C in vitro. In this regard, the SiP (0, 5 and 15 wt%) accelerated the collagen polymerization and modified the collagen network structural parameters, while the oligourethane crosslinking regulated the mechanics and degradation of the material. The biocomposite hydrogels containing 15 wt% SiP showed controlled release of Dex for 11 days, obtaining a 79% release efficiency. As a consequence, the delivery of Dex from biocomposites was capable of enhancing cell metabolic activity and TGF-β1 secretion by macrophages. These composite collagen hydrogels combine structures and properties that make them promising templates for loading and delivering Dex that can modulate the macrophage response in a soft tissue engineering context.
机译:基于细胞外基质(ECM)的水凝胶能够以受控方式提供治疗剂,代表了指导组织再生的平台。这项工作报告了一种新颖的方法,其中在ECM水凝胶中掺入二氧化硅颗粒(SiP)支持地塞米松(Dex)的负载和释放。源自猪小肠粘膜下层(SIS),水溶性低聚乙烷(由聚乙二醇和六亚甲基二异氰酸酯合成的PPU)和SiP的生物复合水凝胶在pH 7.4和37°C的体外递送Dex。 。就这一点而言,SiP(0、5和15 wt%)加速了胶原蛋白的聚合并修改了胶原蛋白网络的结构参数,而低聚乙烷的交联则调节了材料的力学和降解。包含15 wt%SiP的生物复合水凝胶在11天内显示出Dex的控制释放,获得79%的释放效率。结果,从生物复合物递送Dex能够增强巨噬细胞的细胞代谢活性和TGF-β1分泌。这些复合胶原蛋白水凝胶结合了结构和特性,使其成为有前途的模板,可用于加载和递送Dex,从而可以在软组织工程环境中调节巨噬细胞反应。

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