Function of Platelet-Induced Epithelial Attachment at Titanium Surfaces Inhibits Microbial Colonization

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Microbiology

Background:

• Peri-implantitis, a common complication of dental implants, arises from bacterial invasion due to inadequate epithelial sealing and basal lamina (BL) attachment.
• Current surface modifications for titanium implants have not successfully prevented bacterial infection clinically.
• Previous research demonstrated that protease-activated receptor 4-activating peptide (PAR4-AP) modification of titanium promotes platelet activation and epithelial sheet formation.

Purpose of the Study:

• To evaluate the barrier function of platelet-induced epithelial sheets on titanium surfaces against bacterial invasion.
• To test the hypothesis that platelet-induced epithelial sheets on PAR4-AP-modified titanium reduce bacterial attachment, penetration, and invasion.
• To assess the potential of this approach in preventing peri-implantitis.

Main Methods:

• Titanium surfaces were modified with PAR4-AP and incubated with platelet-rich plasma (PRP) to induce platelet aggregation and collagen IV release.
• Human gingival epithelial cells were seeded onto the modified titanium surfaces to form epithelial sheets.
• Green fluorescent protein (GFP)-expressing Escherichia coli was used to challenge surfaces with and without epithelial sheets to assess bacterial adhesion and invasion.

Main Results:

• Platelet aggregation on PAR4-AP-modified titanium surfaces released collagen IV, a key component of the basal lamina.
• Epithelial sheets successfully formed on the PAR4-AP-modified titanium surfaces.
• Significantly fewer Escherichia coli adhered to titanium surfaces with epithelial sheets compared to those without.
• No bacterial invasion was observed beneath the epithelial sheets on the modified titanium surface.

Conclusions:

• Platelet-induced epithelial sheets on PAR4-AP-modified titanium surfaces create an effective barrier against bacterial attachment, penetration, and invasion.
• This in vitro study demonstrates the potential of this biomimetic approach to prevent peri-implantitis.
• The findings suggest a promising new strategy for enhancing the clinical success of titanium dental implants.