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Issue 13, 2014
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Cholesterol affects C60 translocation across lipid bilayers

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Abstract

Cholesterol plays an important role in regulating the structural properties of phospholipid membranes and further influences the permeability of molecules and nanoparticles. However, nanoparticles' translocation across phospholipid membranes in the presence of cholesterol on the molecular scale is rarely studied. Here, we performed coarse-grained molecular dynamics simulations to probe the translocation of C60, one of the most popular nanoparticles, across dipalmitoylphosphatidylcholine bilayers with different concentrations of cholesterol molecules (0–50 mol%). The results reveal that the presence of cholesterol molecules induces lower area per lipid, larger bilayer thickness, and more ordered orientation of lipid tails. The higher the concentration of cholesterol molecules, the more significant is the condensing effect of lipid bilayer as just mentioned. Besides, dynamic processes, free energy profiles and permeability coefficients further indicate that the permeability of C60 decreases with increasing cholesterol concentration, which can be explained by the condensation effect and reduced free volume. Our researches provide an explicit description of the impact of cholesterol on C60 translocation across lipid bilayers.

Graphical abstract: Cholesterol affects C60 translocation across lipid bilayers

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Supplementary files

Article information


Submitted
17 Aug 2013
Accepted
13 Jan 2014
First published
14 Jan 2014

Soft Matter, 2014,10, 2160-2168
Article type
Paper

Cholesterol affects C60 translocation across lipid bilayers

D. Sun, X. Lin and N. Gu, Soft Matter, 2014, 10, 2160
DOI: 10.1039/C3SM52211C

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