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Published on: July 1, 2013
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Microenvironment-responsive nanoparticles functionalized titanium implants mediate redox balance and immunomodulation
Wei Chen1,2,3, Yifei Pan1,2,3, Catherine Huihan Chu4
1Department of Oral Implantology, Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing, 210029, China.
Materials Today. Bio
|March 24, 2025
Summary
New smart titanium implants with responsive nanoparticles enhance bone integration. These implants dynamically manage oxidative stress and inflammation, promoting bone regeneration, especially in challenging conditions like diabetes and osteoporosis.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Regenerative Medicine
Background:
- Persistent oxidative stress in pathological conditions like diabetes and osteoporosis compromises the immune microenvironment, hindering osseointegration.
- Reactive oxygen species (ROS) have a complex role in bone tissue, necessitating dynamic redox balance management for improved bone healing.
- Current biomaterials often lack responsiveness to the microenvironment, limiting their efficacy in complex pathological settings.
Purpose of the Study:
- To develop microenvironment-responsive coordination nanoparticles (C-Ca-SalB NPs) for enhanced osseointegration.
- To functionalize titanium implant surfaces with these nanoparticles to achieve on-demand antioxidant and immunomodulatory effects.
- To investigate the efficacy of these smart implants in promoting bone regeneration under both normal and oxidative stress conditions.
Main Methods:
- Construction of C-Ca-SalB NPs using salvianolic acid B (SalB), catechol-conjugated chitosan (CS-C), and Ca2+.
- Covalent immobilization of C-Ca-SalB NPs onto titanium implant surfaces.
- Evaluation of implant performance under physiological and acidic oxidative conditions, assessing ROS-scavenging, anti-inflammatory, and osteoinductive capacities.
Main Results:
- Functionalized implants exhibited modest immunomodulatory effects under physiological conditions without disrupting oxidative balance.
- Under acidic oxidative conditions, C-Ca-SalB NPs rapidly decomposed, demonstrating potent ROS-scavenging and anti-inflammatory activities.
- The modified implants successfully remodeled the pathological microenvironment into a regenerative one, facilitating bone regeneration.
Conclusions:
- Smart implants with controlled bioactive agent release offer a comprehensive strategy for improving bone-implant integration.
- The microenvironment-responsive nature of C-Ca-SalB NPs enables targeted therapeutic effects, particularly beneficial in oxidative stress contexts.
- This approach presents a promising solution for enhancing osseointegration in patients with conditions like diabetes and osteoporosis.
