Adhesion of giant vesicles mediated by weak binding of Sialyl-Lewis(x) to E-selectin in the presence of repelling poly(ethylene glycol) molecules
Lorz BG, Smith AS, Gege C, Sackmann E (2007)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2007
Journal
Publisher: AMER CHEMICAL SOC
Book Volume: 23
Pages Range: 12293-12300
Journal Issue: 24
URI: https://www.ncbi.nlm.nih.gov/pubmed/17918980
DOI: 10.1021/la701824q
Abstract
Prior to establishing tight contact with the endothelium, cells such as leukocytes or cancer cells use the recognition between sialyl-Lewis(X) ligands and E-selectin receptors to establish weak, reversible adhesion and to roll along the vessel wall. We study the physical aspects of this process by constructing a mimetic system that consists of a giant fluid vesicle with incorporated lipid-anchored sialyl-Lewis(X) molecules that bind to E-selectin that is immobilized on the flat substrate. The vesicles also carry a certain fraction of repelling PEG2000 molecules. We analyze the equilibrium state of adhesion in detail by means of reflection interference contrast microscopy and find that the adhesion process relies purely on the formation of one or more adhesion domains within the vesicle-substrate contact zone. We find that the content of ligands in the vesicle must be above 5 mol % to establish specific contacts. All concentrations of sialyl-Lewis(X) above 8 mot % provide a very similar final state of adhesion. However, the size and shape of the adhesion domains strongly depend on both the concentrations of E-selectin (0-3500 molecules/mu m(2)) and PEG2000 (0-5 mol %). At 3500 E-selectin molecules/mu m(2) and small concentrations of PEG2000, the vesicle-substrate contact is maximized and fully occupied by a single adhesion domain. At concentrations of 5 mol %, PEG2000 completely impedes the specific binding to any substrate. Lastly, an increase in the adhesion strength is observed in systems with identical compositions if the reduced volume of the vesicles is larger.
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Germany (DE)How to cite
APA:
Lorz, B.G., Smith, A.-S., Gege, C., & Sackmann, E. (2007). Adhesion of giant vesicles mediated by weak binding of Sialyl-Lewis(x) to E-selectin in the presence of repelling poly(ethylene glycol) molecules. Langmuir, 23(24), 12293-12300. https://doi.org/10.1021/la701824q
MLA:
Lorz, Barbara Gertrud, et al. "Adhesion of giant vesicles mediated by weak binding of Sialyl-Lewis(x) to E-selectin in the presence of repelling poly(ethylene glycol) molecules." Langmuir 23.24 (2007): 12293-12300.
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