Effects of surface functional groups on protein adsorption and subsequent cell adhesion using self-assembled monolayers
- 10 August 2007
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 17 (38), 4079-4087
- https://doi.org/10.1039/b708099a
Abstract
We investigated initial cell adhesion on self-assembled monolayers (SAMs) of alkanethiols carrying different functional groups including methyl (CH3), hydroxyl (OH), carboxylic acid (COOH), and amine (NH2). The combination of a surface plasmon resonance (SPR) instrument and a total internal reflection fluorescence microscope (TIRFM) allowed us to examine the kinetics of protein adsorption and correlating cell adhesion. Upon exposure of the SAM surface to a serum-containing medium, serum proteins rapidly adsorbed, and cells subsequently approached the surface. Adhesion of human umbilical vein endothelial cells (HUVECs) was greatly affected by surface functional groups; HUVECs adhered well to COOH– and NH2–SAMs, whereas poorly to CH3– and OH–SAMs. The amount of adsorbed protein from the serum-containing medium varied slightly with the terminal groups of the SAMs. On COOH– and NH2–SAMs, HUVECs adhered to bovine serum albumin (BSA)-preadsorbed surfaces with a few minutes delay, suggesting that displacement of preadsorbed BSA with cell-adhesive proteins, such as fibronectin or vitronectin, supports cell adhesion to these surfaces. Since the concentration of cell-adhesive proteins is much less than that of non-adhesive proteins such as BSA, displacement of adsorbed proteins with cell-adhesive proteins plays an important role in initial cell adhesion.Keywords
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