Protein adsorption and cell adhesion on nanoscale bioactive coatings formed from poly(ethylene glycol) and albumin microgels.
Late-term thrombosis on drug-eluting stents is an emerging problem that might be addressed using extremely thin, biologically active hydrogel coatings. We report a dip-coating strategy to covalently link poly(ethylene glycol) (PEG) to substrates, producing coatings with approximately <100 nm thickness. Gelation of PEG-octavinylsulfone with amines in either bovine serum albumin (BSA) or PEG-octaamine was monitored by dynamic light scattering (DLS), revealing the presence of microgels before macrogelation. NMR also revealed extremely high end-group conversions prior to macrogelation, consistent with the formation of highly crosslinked microgels and deviation from Flory-Stockmayer theory. Before macrogelation, the reacting solutions were diluted and incubated with nucleophile-functionalized surfaces. Using optical waveguide lightmode spectroscopy (OWLS) and quartz crystal microbalance with dissipation (QCM-D), we identified a highly hydrated, protein-resistant layer with a thickness of approximately 75 nm. Atomic force microscopy in buffered water revealed the presence of coalesced spheres of various sizes but with diameters less than about 100 nm. Microgel-coated glass or poly(ethylene terephthalate) exhibited reduced protein adsorption and cell adhesion. Cellular interactions with the surface could be controlled by using different proteins to cap unreacted vinylsulfone groups within the coating.
Scott
Evan A
EA
Department of Biomedical Engineering and Center for Materials Innovation, Washington University in St. Louis, Campus Box 1097, One Brookings Drive, St. Louis, MO 63105, USA.
Nichols
Michael D
MD
Cordova
Lee H
LH
George
Brandon J
BJ
Jun
Young-Shin
YS
Elbert
Donald L
DL
D000327:Adsorption; D000818:Animals; D016466:CHO Cells; D002448:Cell Adhesion; D002460:Cell Line; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006224:Cricetinae; D003412:Cricetulus; D005340:Fibrinogen / Q000378:metabolism; D005347:Fibroblasts / Q000378:metabolism; D005782:Gels; D005898:Glass / Q000737:chemistry; D006801:Humans; D051379:Mice; D011092:Polyethylene Glycols / Q000737:chemistry*; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism*; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D013499:Surface Properties
D020099:Coated Materials, Biocompatible; D005782:Gels; D011506:Proteins; D012710:Serum Albumin, Bovine; D011092:Polyethylene Glycols; D005340:Fibrinogen
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