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Polymers 2013, 5(2), 404-417; doi:10.3390/polym5020404

Cholesterol-Induced Buckling in Physisorbed Polymer-Tethered Lipid Monolayers

Received: 29 March 2013 / Accepted: 18 April 2013 / Published: 26 April 2013
(This article belongs to the Special Issue Polymer Thin Films and Membranes 2013)
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The influence of cholesterol concentration on the formation of buckling structures is studied in a physisorbed polymer-tethered lipid monolayer system using epifluorescence microscopy (EPI) and atomic force microscopy (AFM). The monolayer system, built using the Langmuir-Blodgett (LB) technique, consists of 3 mol % poly(ethylene glycol) (PEG) lipopolymers and various concentrations of the phospholipid, 1-stearoyl-2-oleoyl-sn-glycero-3-phosphocholine (SOPC), and cholesterol (CHOL). In the absence of CHOL, AFM micrographs show only occasional buckling structures, which is caused by the presence of the lipopolymers in the monolayer. In contrast, a gradual increase of CHOL concentration in the range of 0–40 mol % leads to fascinating film stress relaxation phenomena in the form of enhanced membrane buckling. Buckling structures are moderately deficient in CHOL, but do not cause any notable phospholipid-lipopolymer phase separation. Our experiments demonstrate that membrane buckling in physisorbed polymer-tethered membranes can be controlled through CHOL-mediated adjustment of membrane elastic properties. They further show that CHOL may have a notable impact on molecular confinement in the presence of crowding agents, such as lipopolymers. Our results are significant, because they offer an intriguing prospective on the role of CHOL on the material properties in complex membrane architecture.
Keywords: cholesterol; membrane elasticity; polymer-tethered lipid membrane; AFM; biaxial stress; buckling delamination; bilayer compartmentalization cholesterol; membrane elasticity; polymer-tethered lipid membrane; AFM; biaxial stress; buckling delamination; bilayer compartmentalization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hussain, N.F.; Siegel, A.P.; Johnson, M.A.; Naumann, C.A. Cholesterol-Induced Buckling in Physisorbed Polymer-Tethered Lipid Monolayers. Polymers 2013, 5, 404-417.

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