Shape Transformations of Lipid Bilayers Following Rapid Cholesterol Uptake.

TitleShape Transformations of Lipid Bilayers Following Rapid Cholesterol Uptake.
Publication TypeJournal Article
Year of Publication2016
AuthorsRahimi, M, Regan, D, Arroyo, M, Subramaniam, ABala, Stone, HA, Staykova, M
JournalBiophys J
Date Published2016 Dec 20
Keywordsbeta-Cyclodextrins, Biological Transport, Biomechanical Phenomena, Cell Membrane, Cholesterol, Kinetics, Lipid Bilayers, Unilamellar Liposomes

<p>High cholesterol levels in the blood increase the risk of atherosclerosis. A common explanation is that the cholesterol increase in the plasma membrane perturbs the shape and functions of cells by disrupting the cell signaling pathways and the formation of membrane rafts. In this work, we show that after enhanced transient uptake of cholesterol, mono-component lipid bilayers change their shape similarly to cell membranes in vivo. The bilayers either expel lipid protrusions or spread laterally as a result of the ensuing changes in their lipid density, the mechanical constraints imposed on them, and the properties of cyclodextrin used as a cholesterol donor. In light of the increasingly recognized link between membrane tension and cell behavior, we propose that the physical adaptation of the plasma membrane to cholesterol uptake may play a substantial role in the biological response.</p>

Alternate JournalBiophys J
PubMed ID28002741
PubMed Central IDPMC5192696
Grant List240487 / ERC_ / European Research Council / International