Yi Bingcheng, Yu Lei, Yang Yating, Guimarães Carlos F, Xu Ruijie, Thambi Thavasyappan, Zhou Boya, Zhou Qihui, Reis Rui L
Qingdao Key Laboratory of Materials for Tissue Repair and Rehabilitation, Shandong Engineering Research Center for Tissue Rehabilitation Materials and Devices, School of Rehabilitation Sciences and Engineering, University of Health and Rehabilitation Sciences, Qingdao 266113, China.
Department of Traditional Chinese Medicine, Qingdao Central Hospital, University of Health and Rehabilitation Sciences, Qingdao 266042, China.
Asian J Pharm Sci. 2025 Aug;20(4):101057. doi: 10.1016/j.ajps.2025.101057. Epub 2025 Apr 16.
Efficient reconstruction of severe cutaneous wounds necessitates the orchestration of effective cell-mediated matrix remodeling and robust protection against microbial invasion. Herein, we engineered a near-infrared light (NIR)-stimulated, thermo-responsive bilayer system based on a drug-loaded hydrogel with a thermal-responsive temperature of ∼42 °C as the matrix layer and an antibacterial nanofibrous mat as the top layer. The matrix layer integrates basic fibroblast growth factor (bFGF)-loaded thermosensitive gelatin (Gel) hydrogel with polydopamine-Cu coated short nanofibers (P@SF). Upon NIR exposure, P@SF elicits a photothermal effect, causing a rapid increase in temperature by 13.4 °C within 1 min at a power density of 0.75 W/cm, which triggers the gel-sol transition of Gel and controls the release of bFGF. This, in turn, enhances fibroblast and endothelial cells ingrowth into the hydrogel, fostering cell functionalization and matrix remodeling. The top layer consists of poly(L-lactide-co-caprolactone) nanofibers functionalized with lysine-doped polydopamine and poly-l-lysine. It possesses antibacterial efficacy by isolating, controlling (76.23% for and 89.16% for ), and eliminating bacteria upon NIR activation. In rat skin wound models, this NIR-responsive smart bilayer system prevents -mediated bacterial infection (indicative of reduced IL-6 expression), regulates CD31-positive neovascularization, and facilitates collagen remodeling for skin regeneration. In summary, this study introduces a novel strategy, inspired by the centralization of authority, for developing a smart thermo-responsive system with promising potential for the effective reconstruction of severe cutaneous wounds.
严重皮肤伤口的有效重建需要协调有效的细胞介导的基质重塑和对微生物入侵的强大保护。在此,我们设计了一种基于近红外光(NIR)刺激的热响应双层系统,该系统以热响应温度约为42°C的载药水凝胶作为基质层,抗菌纳米纤维垫作为顶层。基质层将负载碱性成纤维细胞生长因子(bFGF)的热敏明胶(Gel)水凝胶与聚多巴胺-Cu涂层短纳米纤维(P@SF)整合在一起。在近红外光照射下,P@SF引发光热效应,在功率密度为0.75W/cm²时,1分钟内温度迅速升高13.4°C,触发Gel的凝胶-溶胶转变并控制bFGF的释放。这反过来又增强了成纤维细胞和内皮细胞向水凝胶内的生长,促进细胞功能化和基质重塑。顶层由用赖氨酸掺杂的聚多巴胺和聚-L-赖氨酸功能化的聚(L-丙交酯-共-己内酯)纳米纤维组成。它通过在近红外光激活后隔离、控制(对 为76.23%,对 为89.16%)和消除细菌而具有抗菌功效。在大鼠皮肤伤口模型中,这种近红外响应智能双层系统可预防 -介导的细菌感染(表明IL-6表达降低),调节CD31阳性的新血管形成,并促进胶原蛋白重塑以实现皮肤再生。总之,本研究引入了一种受权力集中启发的新策略,用于开发一种具有有效重建严重皮肤伤口潜力的智能热响应系统。