Antimicrobial and enzyme-responsive multi-peptide surfaces for bone-anchored devices.

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Tissue Engineering

Background:

• Current implant surfaces are static and fail to adapt to dynamic biological environments.
• Implant integration requires synchronized interactions between biomaterials and remodeling tissues.
• Need for responsive surfaces to improve implant performance and reduce infection rates.

Purpose of the Study:

• To create a multi-functional, dynamic coating for titanium implants.
• To co-immobilize an antimicrobial peptide (GL13K) and a matrix metalloproteinase-9 (MMP-9) responsive peptide.
• To evaluate the coating's biological performance, stability, and responsiveness.

Main Methods:

• Co-immobilization of GL13K and MMP-9-responsive peptides onto titanium surfaces.
• Assessment of anti-biofilm activity.
• Evaluation of osteoblast and fibroblast proliferation.
• Mechanical stability testing.
• In vitro study of peptide release triggered by MMP-9-secreting osteoclasts.

Main Results:

• The dynamic coating demonstrated potent anti-biofilm activity.
• Effective proliferation of osteoblasts and fibroblasts was observed.
• The coating exhibited stability against mechanical stress.
• Peptide release was triggered by MMP-9 for up to seven days.

Conclusions:

• The developed dynamic coating offers a promising strategy for enhancing implant biological performance.
• This technology can reduce infection rates and improve tissue regeneration for percutaneous bone-anchored devices.
• The MMP-9 cleavable peptide platform allows for future conjugation with other therapeutic motifs for enhanced bone formation.