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Updated: Jun 16, 2025
A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials
Published on: March 3, 2023
Programmed surface platform orchestrates anti-bacterial ability and time-sequential bone healing for
Zhou Yu1, Zhaolong Wang2, Yitong Chen1
1Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Engineering Research Center of Oral Biomaterials and Devices of Zhejiang Province, Hangzhou, Zhejiang, 310006, China.
This study presents a novel titanium implant surface platform that releases silver ions to combat infection and promote bone healing. The advanced surface supports tissue regeneration and improves implant integration in infected bone environments.
Area of Science:
- Biomaterials Science
- Infectious Diseases
- Orthopedic Surgery
Background:
- Implant-associated infection (IAI) poses a significant clinical challenge due to the limitations of current titanium implants, which exhibit inadequate antibacterial properties and limited functionality.
- IAI healing is a complex process requiring a coordinated biological response, which is often compromised by infection and inadequate implant design.
Purpose of the Study:
- To develop a versatile titanium-based implant surface platform capable of sequential functional presentation for enhanced IAI therapy.
- To create a platform that addresses both the antibacterial needs and the subsequent bone healing requirements in the context of infection.
Main Methods:
- Fabrication of titania nanotubes on titanium implants, followed by poly-γ-glutamic acid (γ-PGA) coating for silver ion (Ag+) incorporation.
- Development of a pH-sensitive release system for Ag+ in response to the acidic microenvironment of bone infection.
- In vitro and in vivo evaluation of the platform's biocompatibility, immunomodulatory effects on macrophages, and impact on osteoblast/osteoclast coupling.
Main Results:
- The poly-γ-glutamic acid/silver ion (PGA/Ag) platform demonstrated efficient Ag+ incorporation and pH-sensitive release.
- The platform exhibited satisfactory biocompatibility and modulated macrophage polarization from pro-inflammatory M1 to pro-healing M2 phenotype.
- The PGA/Ag platform promoted angio/osteogenesis and improved osseointegration by mediating osteoblast/osteoclast coupling via inhibition of CCL3/CCR1 signaling, even under bacterial infection.
Conclusions:
- The novel integrated PGA/Ag surface platform effectively manages sequential biological events under pathological conditions, demonstrating great potential for IAI therapy.
- This functional surface platform addresses the critical need for improved implant performance in infected bone environments, promoting synergistic healing outcomes.
