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Effect of wettability and surface functional groups on protein adsorption and cell adhesion using well-defined mixed self-assembled monolayers

Paper ID Volume ID Publish Year Pages File Format Full-Text
10726 700 2007 9 PDF Available
Title
Effect of wettability and surface functional groups on protein adsorption and cell adhesion using well-defined mixed self-assembled monolayers
Abstract

Self-assembled monolayers (SAMs) of alkanethiols, which can provide flat and chemically well-defined surfaces, were employed as model surfaces to understand cellular interaction with artificial materials. SAMs presenting a wide range of wettabilities were prepared by mixing two kinds of alkanethiols carrying terminal methyl (CH3), hydroxyl (OH), carboxylic acid (COOH), or amino (NH2) groups. Adhesion behavior of human umbilical vein endothelial cells (HUVECs) and HeLa cells on these mixed SAMs were examined. The number of adhered HUVECs reached a maximum on CH3/OH mixed SAMs with a water contact angle of 40°, while cell adhesion increased with decreasing water contact angle up to 60–70° and then leveled off on CH3/COOH and CH3/NH2 mixed SAMs. Numbers of adhered HeLa cells showed a maximum on CH3/OH and CH3/COOH mixed SAMs with a water contact angle of 50°. These facts suggest that cell adhesion is mainly determined by surface wettability, but is also affected by the surface functional group, its surface density, and the kinds of cells. The effect of exchange of adsorbed proteins on cell adhesion was also examined. HUVECs were cultured on the mixed SAMs preadsorbed with albumin. Cell adhesion was effectively prohibited on hydrophobic SAMs pretreated with albumin. Albumin strongly adsorbed and resisted replacement by cell adhesive proteins on hydrophobic SAMs. On the other hand, cells adhered to albumin-adsorbed hydrophilic SAMs. Displacement of preadsorbed albumin with cell adhesive proteins effectively occurs on these hydrophilic SAMs. This effect contributes to induce SAMs with moderate wettability to give suitable surfaces for cell adhesion.

Keywords
Cell adhesion; Protein adsorption; Wettability; Thiol; Self-assembly
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Effect of wettability and surface functional groups on protein adsorption and cell adhesion using well-defined mixed self-assembled monolayers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 28, Issue 20, July 2007, Pages 3074–3082
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us