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Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method

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Published on: December 1, 2015

Phase separations in binary and ternary cholesterol-phospholipid mixtures.

Arun Radhakrishnan¹

¹Department of Biochemistry, Weill Cornell Medical College, New York, New York, USA. arun314@yahoo.com

Biophysical Journal

|May 6, 2010

Summary

Recent studies show cholesterol and DPPC mixtures exhibit phase separation, resolving discrepancies between fluorescence and NMR findings. A condensed complex model explains these observations in binary and ternary lipid systems.

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Area of Science:

Biophysics
Lipid Bilayer Research
Membrane Biophysics

Background:

Recent studies have reignited debate regarding phase separation in model lipid bilayers composed of cholesterol (Chol) and dipalmitoyl-phosphatidylcholine (DPPC).
Discrepancies exist between fluorescence microscopy, which has not detected phase separation in binary DPPC-Chol mixtures, and NMR studies that infer its presence.
Fluorescence microscopy does reveal micron-scale phase-separated liquid domains in ternary mixtures including diphytanoyl-phosphatidylcholine (DiPhyPC).

Purpose of the Study:

To reconcile conflicting experimental observations regarding phase separation in DPPC-Chol lipid mixtures.
To explain the presence of phase-separated domains in ternary lipid mixtures using a theoretical model.
To investigate the role of condensed complexes in DPPC-Chol phase behavior.

Main Methods:

Utilizing a theoretical model based on condensed complexes of cholesterol and DPPC.
Analyzing the orientation of tie-lines in ternary mixtures (DiPhyPC/DPPC/Chol).
Comparing model predictions with experimental data from fluorescence microscopy and NMR studies.

Main Results:

The proposed model of condensed complexes successfully accounts for the observed experimental results.
The orientation of tie-lines in ternary DiPhyPC/DPPC/Chol mixtures supports the occurrence of phase separation in binary DPPC/Chol mixtures.
The model provides a framework for understanding the differing outcomes of fluorescence and NMR studies.

Conclusions:

Condensed complexes of cholesterol and DPPC are crucial for understanding phase separation behavior in lipid bilayers.
The theoretical model offers a consistent explanation for phase separation phenomena across binary and ternary lipid mixtures.
This work helps resolve long-standing debates in lipid bilayer phase behavior and provides insights into membrane organization.