期刊
ADVANCED MATERIALS
卷 34, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202200096
关键词
3D-printed scaffolds; antimicrobial peptides; gene therapy; metal-organic frameworks; prosthesis-related infection
类别
资金
- National Natural Science Foundation of China [82172464, 82172453, 82102536, 52122312, 81972086]
- National Key Research and Development Project of China [2020YFC1107500, 2020YFC1107503]
- Shanghai Rising-Star Program [21QA1405500]
- Shanghai Rising Stars of Medical Talent Youth Development Program (Youth Medical Talents-Specialist Program) [2019-72]
- Technology Innovation Action Plan Key Project of Shanghai Science and Technology Commission [19411962800]
- Shanghai municipal education commission-Gaofeng clinical medicine grant [20161423]
- NSFC Advancing Targeted Projects [RJTJ-JX-005, RJTJ22-RC-011]
This study proposes a novel antimicrobial system to address the challenges of refractory Staphylococcus aureus-related implant infection. The system provides a continuous, prolonged antibacterial effect at the site of infection and significantly reduces immunosuppression, thereby restoring the antimicrobial immune response.
As research on refractory Staphylococcus aureus-related implant infection intensifies, certain challenges remain, including low antibiotic concentrations within infected areas, immune escape achieved by intracellular bacteria, myeloid-derived suppressor cells (MDSCs) inducing regional immunosuppression, and recurrence of residual pathogenic bacteria after drug suspension. Herein, a novel antimicrobial system to simultaneously address these issues is proposed. Specifically, an oxygen-species-responsive 3D-printed scaffold with shell-core nanoparticles is designed, which are loaded with an antimicrobial peptide plasmid (LL37 plasmid) and have LL37 grafted on their surface (LL37@ZIF8-LL37). The surface-grafted LL37 directly kills S. aureus and, following entry into cells, the nanoparticles kill intracellular bacteria. Moreover, in vitro and in vivo, following translation of the LL37 plasmid, cells function as factories of the antimicrobial peptide, thereby generating a continuous, prolonged antibacterial effect at the site of infection. This system significantly reduces the abnormal increase in MDSCs within the infected microenvironment, thus relieving the immunosuppressive state and restoring a protective antimicrobial immune response. Hence, this proposed antimicrobial system provides an antimicrobial immune response and a novel strategy for S. aureus-related infections by offering a combined active antimicrobial and immunotherapeutic strategy, thereby significantly reducing the recurrence rate following recovery from implant-associated infections.
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