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• W2166496653 abstract "Biomimetic surfactant polymers designed by molecular grafting of pendant RGD peptides (Pep) and dextran oligosaccharides (Dex) in different ratios onto the backbone of poly(vinyl amine) (PVAm) were examined for their ability to promote endothelial cell (EC) growth. Adhesion, formation of focal contacts, and expression of integrin receptors were examined in EC seeded onto a series of novel surfactants containing 100% dextran (PVAm[Pep (0%)]) to 100% peptide (PVAm[Pep (100%)]) compared to fibronectin control. Interaction of EC on polymer was specific, as soluble GRGDSP, but not GRGESP, was able to inhibit both adhesion and spreading of EC. At three hours, EC attachment and spreading were rapid and comparable on fibronectin and PVAm[Pep (100%)], rounded on PVAm[Pep (0%)], and intermediate on PVAm[Pep (25%)], (PVAm[Pep (50%)], and PVAm[Pep (75%)], with increasing peptide ratio favoring more spreading, although all the substrates had similar hydrophilicity. Cells that spread well on fibronectin and PVAm[Pep (100%)] had sharp spikes of vinculin localized at the termination point of actin stress fibers. Formation of stress fibers and focal adhesions on other substrates were correlated with spreading pattern of EC and the peptide content. EC seeded on fibronectin expressed &#102 5 &#103 1 integrins all along the stress fibers and throughout the entire cytoskeleton, but this distribution pattern was less prominent on PVAm[Pep (100%)]. However, expression and distribution of vitronectin receptors ( &#102 v &#103 3 ) were similar on both fibronectin and PVAm[Pep (100%)], suggesting a strong cell adhesion on PVAm[Pep (100%)]. Viability of EC was also comparable on both fibronectin and PVAm[Pep (100%)] at 24 h. Substrates with high proportion of dextran limited cell adhesion, probably by decreasing protein adsorption. These results suggest that it may be possible to engineer substrates that promote cell adhesion in a receptor-dependent manner while blocking nonspecific protein adsorption, which may have potential as interface materials for prostheses used in cardiovascular system." @default.
• W2166496653 created "2016-06-24" @default.
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• W2166496653 date "2002-01-01" @default.
• W2166496653 modified "2023-10-11" @default.
• W2166496653 title "Integrin-Dependent Interaction of Human Vascular Endothelial Cells on Biomimetic Peptide Surfactant Polymers" @default.
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• W2166496653 doi "https://doi.org/10.1080/15419060214148" @default.
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