School of Materials Science and Engineering, the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China, Tianjin University, Yaguan Road 135#, Tianjin, 300072, China.
Biomedical Materials Engineering Research Center, Hubei Key Laboratory of Polymer Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei University, Wuhan, 430062, China.
Small. 2024 Apr;20(15):e2307406. doi: 10.1002/smll.202307406. Epub 2023 Nov 27.
Osteomyelitis caused by deep tissue infections is difficult to cure through phototherapy due to the poor penetration depth of the light. Herein, Cu/C/FeO-COOH nanorod composites (Cu/C/FeO-COOH) with nanoscale tip convex structures are successfully fabricated as a microwave-responsive smart bacteria-capture-killing vector. Cu/C/FeO-COOH exhibited excellent magnetic targeting and bacteria-capturing ability due to its magnetism and high selectivity affinity to the amino groups on the surface of Staphylococcus aureus (S. aureus). Under microwave irradiation, Cu/C/FeO-COOH efficiently treated S. aureus-infected osteomyelitis through the synergistic effects of microwave thermal therapy, microwave dynamic therapy, and copper ion therapy. It is calculated the electric field intensity in various regions of Cu/C/FeO-COOH under microwave irradiation, demonstrating that it obtained the highest electric field intensity on the surface of copper nanoparticles of Cu/C/FeO-COOH due to its high-curvature tips and metallic properties. This led to copper nanoparticles attracted more charged particles compared with other areas in Cu/C/FeO-COOH. These charges are easier to escape from the high curvature surface of Cu/C/FeO-COOH, and captured by adsorbed oxygen, resulting in the generation of reactive oxygen species. The Cu/C/FeO-COOH designed in this study is expected to provide insight into the treatment of deep tissue infections under the irradiation of microwave.
由于光的穿透深度较差,深部组织感染引起的骨髓炎很难通过光疗治愈。在此,成功制备了具有纳米级尖端凸结构的 Cu/C/FeO-COOH 纳米棒复合材料(Cu/C/FeO-COOH)作为一种微波响应型智能细菌捕获杀伤载体。由于 Cu/C/FeO-COOH 具有磁性和对金黄色葡萄球菌(S. aureus)表面氨基的高选择性亲和力,因此表现出优异的磁靶向和细菌捕获能力。在微波照射下,Cu/C/FeO-COOH 通过微波热疗、微波动态治疗和铜离子治疗的协同作用,有效地治疗了金黄色葡萄球菌感染性骨髓炎。计算了微波照射下 Cu/C/FeO-COOH 各区域的电场强度,结果表明,由于其高曲率尖端和金属特性,Cu/C/FeO-COOH 表面的铜纳米颗粒获得了最高的电场强度。这导致铜纳米颗粒比 Cu/C/FeO-COOH 的其他区域吸引了更多的带电粒子。这些电荷更容易从 Cu/C/FeO-COOH 的高曲率表面逸出,并被吸附氧捕获,从而产生活性氧物质。本研究设计的 Cu/C/FeO-COOH 有望为微波照射下深部组织感染的治疗提供新的思路。