An Extracellular Matrix-like Surface for Zn Alloy to Enhance Bone Regeneration

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Tissue Engineering

Background:

• Zinc-based alloys show potential for biodegradable bone implants due to mechanical properties and degradability.
• Excessive local zinc ion (Zn²⁺) release from implants can hinder cell behavior and bone regeneration.
• Developing strategies to control Zn²⁺ release is crucial for effective zinc-based bone defect repair.

Purpose of the Study:

• To fabricate a bone-mimetic extracellular matrix (ECM)-like surface on Zn-1Ca implants.
• To mitigate adverse effects of Zn²⁺ release while promoting osteogenesis and vascularization.
• To evaluate the efficacy of the modified implant surface for bone regeneration.

Main Methods:

• A hybrid process involving anodization, hydrothermal treatment (HT), and fluorous-curing was employed.
• The surface was engineered with Zn₂SiO₄ nanorods coated with collagen I (Col-I).
• In vitro cell culture studies and in vivo implantation tests were conducted.

Main Results:

• The ECM-like surface effectively controlled Zn²⁺ release and reduced implant corrosion.
• Significant improvements in osteoblast adhesion, proliferation, and differentiation were observed.
• Enhanced vascularization of endothelial cells and superior new bone formation in vivo were achieved.

Conclusions:

• The Col-I layered Zn₂SiO₄ nanorod surface mimics the natural bone ECM, creating a favorable microenvironment.
• This biomimetic surface strategy effectively promotes bone regeneration and enhances bone-implant contact.
• The developed material presents a promising scaffold for advanced zinc-based biodegradable implants.