Zhou Haiyan, Ye Silin, Xu Mingjian, Hao Lihui, Chen Junjian, Fang Zhou, Guo Kunzhong, Chen Yunhua, Wang Lin
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China; National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou 510006, China; Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou 510006, China.
Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, China.
Biomaterials. 2023 Oct;301:122200. doi: 10.1016/j.biomaterials.2023.122200. Epub 2023 Jun 17.
Control over the implant surface functions is highly desirable to enhance tissue healing outcomes but has remained unexplored to adapt to the different service stages. In the present study, we develop a smart titanium surface by orchestrating thermoresponsive polymer and antimicrobial peptide to enable dynamic adaptation to the implantation stage, normal physiological stage and bacterial infection stage. The optimized surface inhibited bacterial adhesion and biofilm formation during surgical implantation, while promoted osteogenesis in the physiological stage. The further temperature increase driven by bacterial infection induced polymer chain collapse to expose antimicrobial peptides by rupturing bacterial membranes, as well as protect the adhered cells from the hostile environment of infection and abnormal temperature. The engineered surface could inhibit infection and promote tissue healing in rabbit subcutaneous and bone defect infection models. This strategy enables the possibility to create a versatile surface platform to balance bacteria/cell-biomaterial interactions at different service stages of implants that has not been achieved before.
对植入物表面功能进行控制对于提高组织愈合效果非常有必要,但尚未探索如何使其适应不同的使用阶段。在本研究中,我们通过精心设计热响应聚合物和抗菌肽来开发一种智能钛表面,以实现对植入阶段、正常生理阶段和细菌感染阶段的动态适应。优化后的表面在手术植入过程中抑制细菌粘附和生物膜形成,同时在生理阶段促进骨生成。细菌感染引发的温度进一步升高会导致聚合物链塌陷,通过破坏细菌膜来暴露抗菌肽,同时保护粘附的细胞免受感染和异常温度的不利环境影响。在兔皮下和骨缺损感染模型中,这种工程化表面能够抑制感染并促进组织愈合。这种策略使得创建一个通用表面平台成为可能,以平衡植入物在不同使用阶段的细菌/细胞 - 生物材料相互作用,这是以前未曾实现的。