Peptide functionalized poly(L-lysine)-g-poly(ethylene glycol) on titanium: Resistance to protein adsorption in full heparinized human blood plasma

S. Tosatti, S. M. De Paul, A. Askendal, S. VandeVondele, J. A. Hubbell, P. Tengvall, M. Textor

Research output: Contribution to journalArticlepeer-review

176 Scopus citations

Abstract

The graft copolymer poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) and its RGD- and RDG-functionalized derivatives (PLL-g-PEG/PEG-peptide) were assembled from aqueous solutions on titanium (oxide) surfaces. The polymers were characterized by NMR in order to determine quantitatively the grafting ratio, g (Lys monomer units/PEG side chains), and the fraction of the PEG side chains carrying the terminal peptide group. The titanium surfaces modified with the polymeric monomolecular adlayers were exposed to full heparinized blood plasma. The adsorbed masses were measured by in situ ellipsometry. The different PLL-g-PEG-coated surfaces showed, within the detection limit of the ellipsometric technique, no statistically significant protein adsorption during exposure to plasma for 30min at 22°C or 37°C, whereas clean, uncoated titanium surfaces adsorbed approximately 350ng/cm2 of plasma proteins. The high degree of resistance of the PEGylated surface to non-specific adsorption makes peptide-modified PLL-g-PEG a useful candidate for the surface modification of biomedical devices such as implants that are capable of eliciting specific interactions with integrin-type cell receptors even in the presence of full blood plasma. The results refer to short-term blood plasma exposure that cannot be extrapolated a priori to long-term clinical performance.

Original languageEnglish (US)
Pages (from-to)4949-4958
Number of pages10
JournalBiomaterials
Volume24
Issue number27
DOIs
StatePublished - Dec 2003

Keywords

  • Blood plasma
  • Graft copolymers
  • Peptide
  • Poly(ethylene glycol)
  • Protein resistance
  • Titanium

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering

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