Endothelial cell adhesion and proliferation to PEGylated polymers with covalently linked RGD peptides

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Cell Biology

Background:

• Developing nonfouling surfaces is crucial for preventing protein adsorption and promoting specific cell interactions in biomedical applications.
• Peptide grafting onto polymer surfaces can enhance targeted cell adhesion, particularly for endothelial cells (ECs).

Purpose of the Study:

• To synthesize and characterize a nonfouling peptide-grafted polymer designed to promote endothelial cell binding.
• To investigate the influence of different peptide incorporation methods on EC adhesion and morphology.
• To assess the retention of nonfouling and cell-binding properties after electrospinning into fibrous scaffolds.

Main Methods:

• Synthesis of a polymer composed of hexyl methacrylate, methyl methacrylate, poly(ethylene glycol) methacrylate, and CGRGDS peptide.
• Incorporation of the peptide via chain transfer reaction or coupling to an acrylate-PEG-N-hydroxysuccinimide (NHS) comonomer.
• Culturing human umbilical vein ECs and endothelial colony forming cells on the polymer surfaces and electrospun scaffolds.
• Evaluating cell adhesion, morphology, and protein adsorption resistance.

Main Results:

• The synthesized polymer exhibited nonfouling properties due to poly(ethylene glycol) (PEG) chains, minimizing protein adsorption.
• Peptide incorporation method influenced EC number and morphology; NHS coupling showed improved short-term adhesion.
• Both endothelial cell types adhered better to NHS-coupled RGD peptide films within 2 hours, even with albumin present.
• Significant cell detachment was observed after 4 days, indicating limitations in long-term adhesion.
• Electrospun fibrous scaffolds retained both nonfouling and peptide-binding characteristics.

Conclusions:

• The developed nonfouling peptide-grafted polymer effectively promotes endothelial cell binding, with the NHS coupling method showing superior short-term adhesion.
• While initial cell adhesion is enhanced, long-term stability remains a challenge.
• The material's properties are preserved after processing into fibrous scaffolds, suggesting potential for tissue engineering applications.