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    负载Ag/Cu双金属有机框架的抗菌水凝胶构建及体外性能评价

    Fabrication and In Vitro Evaluation of Antibacterial Hydrogel Loaded with Ag/Cu Metal-Organic Framework

    • 摘要: 细菌侵袭及复杂炎症微环境是感染性创面修复领域面临的核心难题。本文以烟酸为单配体,分别合成银基金属有机框架(Ag MOF)与铜基金属有机框架(Cu MOF),并将两者负载于光敏性甲基丙烯酰化聚乙烯醇(PVA-GMA,简称PG)水凝胶体系中,构建出具备时空可控释放特性的负载Ag/Cu MOFs的PG复合水凝胶(Ag/Cu MOFs@PG)。理化性质研究表明,金属有机框架(MOF)在水凝胶网络中均匀分散,并展现出稳定可控的释放行为。生物学评价证实,Ag/Cu MOFs@PG水凝胶可通过快速释放Ag+实现高效抗菌,可抑制巨噬细胞M1型极化而促进M2型极化,同时借助Cu2+的持续释放促进内皮细胞的迁移与在基质胶上的小管形成。这种集抗菌、抗炎与促血管化于一体的多功能复合水凝胶,在感染性创面治疗中具有较高的应用潜力。

       

      Abstract: The management of bacterial bioburden and the modulation of the intricate inflammatory milieu remain the primary hurdles in achieving effective healing of infected wounds. In this study, silver-based metal-organic framework (Ag MOF) and copper-based metal-organic framework (Cu MOF) were synthesized using nicotinic acid as the sole ligand. The two MOFs were subsequently loaded into a photosensitive glycidyl methacrylate-grafted poly (vinyl alcohol) (PVA-GMA, abbreviated as PG) hydrogel to construct a multifunctional composite hydrogel dressing (denoted as Ag/Cu MOFs@PG) with spatiotemporally-controlled release characteristics. Physicochemical characterization demonstrated that the MOFs were uniformly dispersed within the PG hydrogel and exhibited stable and controlled release behavior. Biological evaluations confirmed that the Ag/Cu MOFs@PG hydrogel achieved highly efficient antibacterial activity through the rapid release of Ag+. Moreover, it inhibited M1 while promoting M2 macrophage polarization. Simultaneously, the sustained release of Cu2+ facilitated endothelial cell migration and tube formation on Matrigel. This multifunctional composite hydrogel, integrated with antibacterial, anti-inflammatory, and pro-angiogenic properties, holds significant potential for the clinical treatment of infected wounds.

       

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