Aiming at the critical issues of bacterial infection,oxidative stress,and immune dysregulation during skin wound healing,this study designs an immunomodulatory hyaluronic acid (HA) nanocomposite hydrogel.The hydrogel was constructed using hexamethylenediamine-grafted HA and aldehyde-modified HA as the backbone,which formed an in situ gel via Schiff base crosslinking.Curcumin-loaded ZIF-8 (Cur@ZIF-8) nanoparticles were incorporated during the gelation process.The structures of the two HA derivatives and the nanoparticles were systematically characterized.The morphology,rheological properties,tissue adhesion,in vitro antibacterial activity,hemolysis ratio,cytotoxicity,and ability to promote macrophage M2 polarization of the hydrogel were evaluated.The results indicate that this hydrogel possesses antibacterial,antioxidant,and immunomodulatory functions,offering a promising material platform for skin wound repair.
基于上述设计思路,本研究制备了HA-HDA和HA-CHO两种透明质酸衍生物,通过核磁共振氢谱(1H nuclear magnetic resonance,1HNMR)验证其结构;合成了ZIF-8及Cur@ZIF-8纳米颗粒,利用扫描电子显微镜(scanning electron microscope,SEM)观察其形貌。将上述组分混合后,即可通过Schiff碱交联形成纳米复合水凝胶,系统评价其微观形貌、流变学行为、组织粘附性能、体外抗菌活性、血液相容性(溶血率)及细胞毒性。特别地,通过体外巨噬细胞培养模型,验证了该水凝胶促进巨噬细胞向M2极化的能力。现有体外实验数据充分表明,该免疫调节透明质酸纳米复合水凝胶在协同抗感染、抗氧化及调控免疫反应方面展现出显著优势,有望成为促进皮肤伤口修复的新型功能敷料,为后续临床转化研究提供理论和材料基础。
将1 mL的HACZ水凝胶加入30 mL PBS(pH=7.4)中,在37℃恒温水浴摇床以100 r/min的转速下摇动。在预定的时间间隔,每次取出2 mL上清液待测,然后补充2 mL PBS。通过UV-Vis测量上清液的吸光度(425 nm)。同时,锌离子的释放使用电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS,NexION 300×,PerkinElmer)测定。
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