Green tea polyphenol tailors cell adhesivity of RGD displaying surfaces: Multicomponent models monitored optically

Beatrix Peter, Eniko Farkas, Eniko Forgacs, Andras Saftics, Boglarka Kovacs, Sandor Kurunczi, Inna Szekacs, Antal Csampai, Szilvia Bosze, Robert Horvath

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The interaction of the anti-adhesive coating, poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) and its Arg-Gly-Asp (RGD) functionalized form, PLL-g-PEG-RGD, with the green tea polyphenol, epigallocatechin-gallate (EGCg) was in situ monitored. After, the kinetics of cellular adhesion on the EGCg exposed coatings were recorded in real-time. The employed plate-based waveguide biosensor is applicable to monitor small molecule binding and sensitive to sub-nanometer scale changes in cell membrane position and cell mass distribution; while detecting the signals of thousands of adhering cells. The combination of this remarkable sensitivity and throughput opens up new avenues in testing complicated models of cell-surface interactions. The systematic studies revealed that, despite the reported excellent antifouling properties of the coatings, EGCg strongly interacted with them, and affected their cell adhesivity in a concentration dependent manner. Moreover, the differences between the effects of the fresh and oxidized EGCg solutions were first demonstrated. Using a semiempirical quantumchemical method we showed that EGCg binds to the PEG chains of PLL-g-PEG-RGD and effectively blocks the RGD sites by hydrogen bonds. The calculations supported the experimental finding that the binding is stronger for the oxidative products. Our work lead to a new model of polyphenol action on cell adhesion ligand accessibility and matrix rigidity.

Original languageEnglish
Article number42220
JournalScientific reports
Volume7
DOIs
Publication statusPublished - Feb 10 2017

ASJC Scopus subject areas

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