Diabetic wounds present challenges in clinical management due to persistent inflammation caused by excessive exudate infiltration.Inspired by the gradient wettability of cactus thorn,this study has devised a biomimeti...Diabetic wounds present challenges in clinical management due to persistent inflammation caused by excessive exudate infiltration.Inspired by the gradient wettability of cactus thorn,this study has devised a biomimetic Janus nanofiber membrane as a water diode,which endows with gradient wettability and gradient pore size,offering sustainable unidirectional self-drainage and antibacterial properties for enhanced diabetic wound healing.The Janus membrane is fabricated by depositing a hydrophilic polyacrylonitrile/chlorin e6 layer with smaller pore sizes onto a hydrophobic poly(ε-caprolactone)with larger pore sizes,thereby generating a vertical gradient in both wettability and pore structure.The incorporation of chlorin e6 in the upper layer enables the utilization of external light energy to generate heat for evaporation and produce reactive oxygen species,achieving a high sterilization efficiency of 99%.Meanwhile,the gradient structure of the Janus membrane facilitates continuous antigravity exudate drainage at a rate of 0.95 g cm^(−2) h^(−1).This dual functionality of effective exudate drainage and sterilization significantly reduces inflammatory factors,allows the polarization of macrophages toward the M2 proliferative phenotype,enhances angiogenesis,and accelerates wound healing.Therefore,this study provides a groundbreaking bioinspired strategy for the development of advanced wound dressings tailored for diabetic wound regeneration.展开更多
背景:Janus微/纳米颗粒因具有形状、结构、功能各向异性被广泛应用于组织工程、药物递送、癌症治疗、生物影像和传感等医学领域。目的:阐述Janus微/纳米颗粒在生物医学的前沿应用。方法:通过计算机检索中国知网、万方、PubMed、Web of S...背景:Janus微/纳米颗粒因具有形状、结构、功能各向异性被广泛应用于组织工程、药物递送、癌症治疗、生物影像和传感等医学领域。目的:阐述Janus微/纳米颗粒在生物医学的前沿应用。方法:通过计算机检索中国知网、万方、PubMed、Web of Science数据库中2010-2024年发表的相关文献,分别以“Janus纳米颗粒,Janus颗粒,双面神颗粒,药物递送,癌症治疗,生物影像,生物传感,组织工程”和“Janus nanoparticle,Janus particle,Drug delivery,Cancer therapy,Biosensing,Bioimaging,Tissue engineering”为中、英文检索词,进行筛选、整理、归纳、总结,最终纳入69篇文献进行综述。结果与结论:Janus微/纳米颗粒可根据基础材料性质分为有机、无机、有机-无机复合三大类,其合成策略有遮蔽、自组装、相分离、微流控和成核生长等。Janus微/纳米颗粒可通过高负载率、门控释放、自主运动等特性进行高效率药物递送。Janus微/纳米颗粒除了增强传统癌症治疗措施(放化疗)的治疗效果外,还可以应用于细胞免疫、蛋白药物、细胞铁死亡等新兴癌症治疗方法;可应用于增强生物影像(CT、MRI、超声)的增敏剂,实现高质量成像,用于指导诊断和治疗;可通过运载生长因子、增强生物支架机械性能和抗菌效果,应用于组织工程。综合目前的研究,研究者们通过集合不同有机聚合物、无机材料的物化特性以不同的合成策略合成功能定制的Janus微/纳米颗粒,应用于复杂的生物医学领域。目前Janus微/纳米颗粒应用于组织再生领域、大规模生产和人体临床试验的报道较少,因此该类材料的开发、合成策略、临床安全评估和转化仍需投入更大的研究力度。展开更多
基金All animal experiments were performed under the protocols approved by the Ethical Committee for Animal Care of Donghua University(DHUEC-NSFC-2019-20)financially supported by the National Key Research and Development Program of China(2021YFA1201304)+3 种基金the National Natural Science Foundation of China(52503082),China Postdoctoral Science Foundation(2024M750402)Postdoctoral Fellowship Program of CPSF(GZC20230419)Shanghai Anticancer Association EYAS PROJECT(SACA-CY23C05)The Fundamental Research Funds for the Central Universities(2232023D-03,2232024Y-01).
文摘Diabetic wounds present challenges in clinical management due to persistent inflammation caused by excessive exudate infiltration.Inspired by the gradient wettability of cactus thorn,this study has devised a biomimetic Janus nanofiber membrane as a water diode,which endows with gradient wettability and gradient pore size,offering sustainable unidirectional self-drainage and antibacterial properties for enhanced diabetic wound healing.The Janus membrane is fabricated by depositing a hydrophilic polyacrylonitrile/chlorin e6 layer with smaller pore sizes onto a hydrophobic poly(ε-caprolactone)with larger pore sizes,thereby generating a vertical gradient in both wettability and pore structure.The incorporation of chlorin e6 in the upper layer enables the utilization of external light energy to generate heat for evaporation and produce reactive oxygen species,achieving a high sterilization efficiency of 99%.Meanwhile,the gradient structure of the Janus membrane facilitates continuous antigravity exudate drainage at a rate of 0.95 g cm^(−2) h^(−1).This dual functionality of effective exudate drainage and sterilization significantly reduces inflammatory factors,allows the polarization of macrophages toward the M2 proliferative phenotype,enhances angiogenesis,and accelerates wound healing.Therefore,this study provides a groundbreaking bioinspired strategy for the development of advanced wound dressings tailored for diabetic wound regeneration.
