伤口愈合
巨噬细胞
促炎细胞因子
体内
炎症
活性氧
微生物学
化学
免疫学
细胞生物学
医学
体外
生物
生物化学
生物技术
作者
Tianhua Xiao,Shiyuan Liu,Yuanxin Li,Yu Cai,Xianying Xing,Ming Shao,Chi Zhang,Dongming Duan,Song Liu,Guoxin Tan,Le Wang,Zenghui Wu,Zunlei Gong,Lei Zhou
标识
DOI:10.1016/j.mtbio.2023.100788
摘要
Methicillin-resistant Staphylococcus aureus (MRSA) infection is a pressing clinical issue that impedes wound healing. Pro-inflammatory M1 macrophages is required to clear bacteria and recruit various cell types during the initial phase of wound healing, but timing of this process is crucial. Herein, a microenvironment-responsive nanofibrous dressing capable of timely macrophage phenotype transition in vivo is constructed by coating copper ions (Cu2+)-polydopamine (PDA) networks on poly (ε-caprolactone) fiber (PCL-fiber) membrane. During the initial post-implantation period, the nanofibrous dressing show pH-sensitive Cu2+ release in the acidic infection microenvironment. The release Cu2+ have a direct killing effect on MRSA, and promote the proinflammatory M1 phenotype of macrophages to enhance the antibacterial macrophage response. Later, PDA to become a reactive oxygen species (ROS) scavenger when in microenvironments with elevated ROS levels, which conferred the dressing with an immunomodulatory activity that convert M1 macrophages into M2 macrophages. In vivo examination in an MRSA infected full-thickness skin wounds of rat model demonstrates that this dressing significantly facilitated infection eradication and wound healing through modulating local inflammatory phenotype. Overall, this study offers a simple and effective approach for timely manipulation of inflammation progression to promote infected wound healing.
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