Journal
BIOELECTROCHEMISTRY
Volume 124, Issue -, Pages 133-141Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2018.07.010
Keywords
Bilayer lipid membranes; Glioblastoma cells; Phosphatidylcholine; Quercetin; Surface charge density; Electrochemical impedance spectroscopy
Funding
- Polish Ministry of Science and Higher Education under Faculty of Biology and Chemistry, University of Bialystok [BST-122]
- Slovak Research and Development Agency [APVV-17-0149]
- European Funds for Regional Development
- National Funds of Ministry of Science and Higher Education, as part of the Operational Programme Development of Eastern Poland 2007-2013 [POPW.01.03.00-20-044/11]
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Quercetin is a naturally-occurring flavonoid claimed to exert many beneficial health effects. In this report, the influence of quercetin on the surface charge of phosphatidylcholine liposomes and human glioblastoma LN-229 and LN-18 cells was studied using microelectrophoretic mobility measurements. The effect of quercetin on the electrical resistance and capacitance of bilayer lipid membranes was analyzed via electrochemical impedance spectroscopy. The results showed that after flavonoid treatment, the cell lines demonstrated changes in surface charge only in alkaline pH solutions, whereas there were no significant alterations in quercetin-treated vs. control cells in acidic pH solutions. The same tendency was found for liposomal membranes proving that quercetin insertion into membranes is strongly pH-dependent. Capacitance and resistance measurements conducted in acidic electrolyte solutions demonstrated an increase in both electrical parameters, indicating an increased amount of quercetin inserted into the bilayers. Moreover, the cytotoxic effect of quercetin confirms that the flavonoid enters the cells and perturbs the proliferation of LN-229 and LN-18 glioblastoma cell lines. As such, our results indicate that the specific localization of quercetin, membrane-bound or cell-entering, might be crucial for its pharmacological activity. However, further studies are necessary prior to applying these physicochemical measurements as standard methods of evaluating drug activity. (C) 2018 Elsevier B.V. All rights reserved.
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