Platelet and leukocyte adhesion to albumin binding self-assembled monolayers

  • Inês C. Gonçalves
  • M. Cristina L. Martins
  • Judite N. Barbosa
  • Pedro Oliveira
  • Mário A. Barbosa
  • Buddy D. Ratner
Article

Abstract

This study reports the use of tetraethylene glycol-terminated self-assembled monolayers (EG4 SAMs) as a background non-fouling surface to study the effect of an 18 carbon ligand (C18) on albumin selective and reversible adsorption and subsequent platelet and leukocyte adhesion. Surface characterization techniques revealed an efficient immobilization of different levels of C18 ligand on EG4 SAMs and an increase of surface thickness and hydrophobicity with the increase of C18 ligands. Albumin adsorption increased as the percentage of C18 ligands on the surface increased, but only 2.5%C18 SAMs adsorbed albumin in a selective and reversible way. Adherent platelets also increased with the amount of immobilized C18. Pre-immersion of samples in albumin before contact with platelets demonstrated an 80% decrease in platelet adhesion. Pre-immersion in plasma was only relevant for 2.5%C18 SAMs since this was the only surface to have less platelet adhesion compared to buffer pre-immersion. EG4 SAMs adhered negligible amounts of leukocytes, but surfaces with C18 ligands have some adherent leukocytes. Except for 10%C18 SAMs, which increased leukocyte adhesion after albumin pre-adhesion, protein pre-immersion did not influence leukocyte adhesion. It has been shown that a surface with a specific surface concentration of albumin-binding ligands (2.5%C18 SAMs) can recruit albumin selectively and reversibly and minimize the adhesion of platelets, despite still adhering some leukocytes.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Inês C. Gonçalves
    • 1
    • 2
  • M. Cristina L. Martins
    • 1
  • Judite N. Barbosa
    • 1
    • 3
  • Pedro Oliveira
    • 3
  • Mário A. Barbosa
    • 1
    • 2
    • 3
  • Buddy D. Ratner
    • 4
  1. 1.INEB-Instituto de Engenharia BiomédicaUniversidade do PortoPortoPortugal
  2. 2.Faculdade de EngenhariaUniversidade do PortoPortoPortugal
  3. 3.ICBAS - Instituto de Ciências Biomédicas de Abel SalazarUniversidade do PortoPortoPortugal
  4. 4.Department of Bioengineering and Chemical EngineeringUniversity of WashingtonSeattleUSA

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