Dual-functional polyetheretherketone surface modification for enhanced osseointegration and antibacterial activity in pH-responsive manner  

作　　者：Rui Ding Zhang Yuan Ke Wang Pandi Peng Jiaheng Liang Kun Wang Ke Lin Hanxue Wu Peng Li 

机构地区：[1]Frontiers Science Center for Flexible Electronics(FSCFE),Xi’an Institute of Flexible Electronics(IFE),Xi’an Institute of Biomedical Materials and Engineering(IBME),Northwestern Polytechnical University(NPU),Xi’an,710072,China [2]Xi’an Key Laboratory of Stem Cell and Regenerative Medicine Institute of Medical Research,Northwestern Polytechnical University,Xi’an,710072,China

出　　处：《Journal of Materials Science & Technology》2024年第33期129-140,共12页材料科学技术(英文版)

基　　金：supported by the National Natu-ral Science Foundation of China(No.52073230);the Shaanxi Provincial Science Fund for Distinguished Young Scholars(No.2023-JC-JQ-32).

摘　　要：Polyetheretherketone(PEEK)has been recognized for its immense potential in hard tissue repair applications due to its mechanical properties resembling those of natural bones.However,the inherent bioinertness of pristine PEEK results in insufficient osseointegration.Moreover,implant-associated infection(IAI)has become a serious threat in orthopedic surgery.These risks usually lead to implant loosening,delayed healing,and even the failure of implantation,hampering many clinical applications of PEEK.In this study,we present a facile strategy to endow PEEK implants with enhanced osseointegration and pH-responsive antibacterial activity.Briefly,pristine PEEK was first treated with mixed acids to obtain a porous structure(referred to as SNPEEK),and then the metal-phenolic networks(MPN)coating was prepared using layer-by-layer(LbL)assembly consisting of Sr2+and tannin acid(TA)(referred to as ST coating).The results demonstrated that the dual-functional PEEK displayed enhanced antibacterial activity in pH-responsive manner.At pH 7.4,the antibacterial ratios were 71.72%and 66.79%against Staphylococcus aureus(MSSA,ATCC 25,923)and methicillin-resistant Staphylococcus aureus(MRSA,ATCC BAA-40),respectively.Remarkably,at pH 5.5,the antibacterial activities significantly increased,resulting in killing ratios of 99.98%and 100%,respectively.Furthermore,the dual-functional PEEK promoted osteogenic differentiation of pre-osteoblasts(MC3T3-E1)and migration of human umbilical vascular endothelial cells(HUVECs).In addition,the dual-functional PEEK demonstrated effective anti-infection ability and desirable new bone formation ability in vivo compared to both pristine PEEK and SNPEEK implants.Overall,this study provides a promising strategy to endow PEEK implants with effective osseointegration and anti-infective ability,representing a prospective solution to address current clinical challenges associated with PEEK implants.

关 键 词：POLYETHERETHERKETONE Surface modification Metal-phenolic network PH-RESPONSIVE ANTI-INFECTIVE OSSEOINTEGRATION 

分 类 号：TQ3[化学工程]