Rapid and Robust Coating Method to Render Polydimethylsiloxane Surfaces Cell-Adhesive.

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Polydimethylsiloxane (PDMS) is a versatile material for biomedical applications due to its favorable properties.
• Standard PDMS surfaces require modification to promote cell attachment and spreading.
• Existing surface modification methods are often time-consuming, complex, and inefficient.

Purpose of the Study:

• To develop a novel, rapid, and robust one-step method for coating PDMS surfaces to enhance cell adhesion.
• To utilize engineered anchor peptides fused with cell-adhesive sequences (GRGDS) for improved cell-surface interactions on PDMS.

Main Methods:

• A one-step coating process involving dipping PDMS into a solution of engineered anchor peptides.
• Utilizing hydrophobic interactions for predominant anchor peptide attachment to the PDMS surface.
• Characterizing peptide binding kinetics and optimizing coating for fibroblast and endothelial cell attachment.

Main Results:

• Demonstrated efficient cell attachment and spreading on the modified PDMS surfaces.
• Successfully applied the coating to PDMS-based nanotopographic gradients.
• Achieved fibroblast alignment on nanotopographic gradients with a 5 μm wrinkle threshold.

Conclusions:

• The novel one-step peptide coating method offers a fast and efficient way to improve cell adhesion on PDMS.
• This technique overcomes limitations of traditional PDMS surface modification methods.
• The method shows potential for advanced applications, including cell alignment on nanotopographic structures.