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Related Experiment Videos

Control of lipid membrane stability by cholesterol content.

S Raffy1, J Teissié

  • 1Institut de Pharmacologie et de Biologie Structurale du CNRS, UPR 9062, F-31062 Toulouse Cedex, France.

Biophysical Journal
|March 30, 1999
PubMed
Summary
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Cholesterol concentration impacts lipid bilayer organization and permeability, especially in the gel state. Higher cholesterol levels facilitate membrane permeabilization and protein insertion under milder electric fields.

Area of Science:

  • Biophysics
  • Membrane Biology
  • Materials Science

Background:

  • Cholesterol is a key regulator of cell membrane organization and function.
  • Lipid bilayer permeability is crucial for cellular processes.
  • Understanding cholesterol's role in membrane properties is essential for various biological and medical applications.

Purpose of the Study:

  • To systematically investigate the concentration-dependent effect of cholesterol on lipid bilayer permeability.
  • To explore how cholesterol influences membrane organization and electropermeabilization in different lipid states (gel and fluid).
  • To determine the impact of cholesterol on electroinsertion of membrane proteins.

Main Methods:

  • Utilized electropermeabilization of lipid vesicles induced by external electric fields.

Related Experiment Videos

  • Measured transmembrane potential difference modulation to assess membrane electrical permeability.
  • Studied cholesterol effects on phosphatidylcholine bilayers in both gel and fluid states.
  • Investigated cholesterol's influence on electroinsertion of solubilized membrane proteins.

    • Main Results:

    • Cholesterol did not affect electropermeabilization or electroinsertion in fluid-state lipids.
    • In gel-state lipids, cholesterol exhibited a dose-dependent effect on membrane properties.
    • At 6% cholesterol, electropermeabilization and electroinsertion were inhibited.
    • Above 12% cholesterol, electropermeabilization and electroinsertion occurred under milder electric field conditions.
    • These effects are tentatively attributed to cholesterol-induced alterations in the bilayer's hydrophobic core.

    Conclusions:

    • Lipid membrane permeability is significantly affected by cholesterol content, particularly in the gel state.
    • Cholesterol's influence on membrane organization and permeability is state-dependent (gel vs. fluid).
    • The study provides insights into cholesterol's role in modulating membrane electrical properties and protein handling.