Enhanced cellular adhesion on titanium by silk functionalized with titanium binding and RGD peptides

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Surface Chemistry

Background:

• Soft tissue adhesion to titanium implants is a significant challenge.
• Enhancing cell-material interactions is crucial for implant success.
• Current methods for improving biomaterial surface properties are limited.

Purpose of the Study:

• To develop a novel surface modification strategy for titanium using peptide-functionalized silk fibroin.
• To improve the adhesion of cells, specifically fibroblasts and endothelial cells, to titanium surfaces.
• To investigate the potential of this approach for implantable medical devices.

Main Methods:

• Silk fibroin was chemically grafted with titanium binding peptide (TiBP) and arginine-glycine-aspartic acid (RGD) peptides.
• Quartz crystal microbalance was used to quantify peptide adsorption to titanium.
• Cell adhesion assays (fibroblasts, endothelial cells) were performed on modified titanium surfaces.
• Scanning electron microscopy and immunocytochemical staining were used for evaluation.

Main Results:

• TiBP-functionalized silk significantly increased protein deposition on titanium by over 35%.
• Multifunctional silk coatings (TiBP-RGD) enhanced fibroblast adherence by 60%.
• Strong adhesion and expansion of endothelial cells were observed on the modified surfaces.

Conclusions:

• Silk fibroin functionalized with TiBP and RGD peptides is a promising strategy for modifying cell-biomaterial interfaces.
• This approach enhances cell adhesion and shows potential for implantable medical devices, particularly those requiring reendothelialization.
• The study opens new perspectives for designing advanced biomaterials.