Photothermal Coating on Zinc Alloy for Controlled Biodegradation and Improved Osseointegration
Yuchien Hsu1,2, Yunjiao He1,2, Xiao Zhao1,2
1Department of Prosthodontics, Peking University School and Hospital of Stomatology, No.22, Zhongguancun South Avenue, Haidian District, Beijing, 100081, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 14, 2025
Summary
This study introduces a novel near-infrared light-controlled coating for zinc alloys, improving orthopedic biomaterial performance. The coating regulates zinc ion release and uses mild photothermal therapy to enhance bone healing and integration.
Area of Science:
- Biomaterials Science
- Orthopedic Engineering
- Nanotechnology
Background:
- Zinc alloys are promising orthopedic biomaterials due to their degradability and mechanical strength.
- However, uncontrolled zinc ion release can lead to cytotoxicity and hinder bone integration.
- Developing methods to control degradation and enhance osseointegration is crucial for clinical success.
Purpose of the Study:
- To develop a near-infrared (NIR) light-controlled coating for zinc alloys to regulate degradation and improve osseointegration.
- To investigate the combined effects of controlled zinc ion release and photothermal therapy on osteogenesis.
- To elucidate the underlying molecular mechanisms promoting bone formation.
Main Methods:
- Fabrication of a polycaprolactone/copper-sulfate (PCL/CuS) coating on zinc-lithium (Zn-Li) alloy substrates.
- In vitro cell culture studies to assess cell proliferation and osteogenic differentiation.
- In vivo studies using Micro-Computed Tomography (Micro-CT), SEM-EDS, and immunohistochemistry to evaluate osseointegration.
- Molecular analysis using RNA sequencing and Western blotting to identify signaling pathways involved.
Main Results:
- The PCL/CuS coating effectively reduced early zinc ion release and maintained biocompatibility.
- NIR light stimulation enabled controlled zinc ion release and mild photothermal therapy.
- In vitro and in vivo studies showed enhanced cell proliferation, osteogenic differentiation, and improved osseointegration.
- Mechanistic studies revealed activation of the Wnt/β-catenin pathway and inhibition of the NF-κB pathway.
Conclusions:
- The NIR light-controlled PCL/CuS coating is a viable strategy to modulate zinc alloy degradation for orthopedic applications.
- This approach enhances osseointegration through controlled zinc ion release and photothermal therapy.
- The coating promotes osteogenesis by regulating key cellular signaling pathways, presenting a promising advancement in orthopedic biomaterials.
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