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Lo/Ld phase coexistence modulation induced by GM1.

Nicolas Puff1, Chiho Watanabe2, Michel Seigneuret2

  • 1UPMC Univ. Paris 06, UFR 925 Physics Department, Paris, France; Laboratoire Matière et Systèmes Complexes (MSC), UMR 7057 CNRS and Université Paris Diderot-Paris 7, Paris, France.

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PubMed
Summary

Ganglioside GM1 concentration controls lipid raft domain size in model cell membranes. Increasing GM1 shifts phase separation from micrometer to nanometer scales, stabilizing nanodomains.

Keywords:
GM1GUVL(o)/L(d) phase coexistenceLaurdanMicrodomainNanoscale domain

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Area of Science:

  • Membrane biophysics
  • Lipid bilayer phase behavior
  • Cell membrane nanostructures

Background:

  • Lipid rafts are crucial for cellular functions and undergo size changes.
  • Understanding factors controlling raft domain size is key to deciphering their role.
  • Model systems are essential for studying lipid raft formation and dynamics.

Purpose of the Study:

  • Investigate the effect of ganglioside GM1 concentration on lipid raft (Lo) domain size.
  • Determine if lipid composition alone can control the existence and size of membrane domains.
  • Explore GM1's role in the transition from nanoscopic to microscopic lipid domains.

Main Methods:

  • Studied PC/SM/Chol/GM1 bilayers using giant unilamellar vesicles (GUVs).
  • Utilized fluorescence spectroscopy (C12NBD-PC self-quenching, Laurdan GP) to detect nanoscale phase separation.
  • Employed Gaussian spectral decomposition analysis for spectral data interpretation.

Main Results:

  • GM1 concentrations above 1 mol% prevent micrometer-scale Lo domain formation.
  • Nanoscale Lo/Ld phase separation occurs below optical resolution, detectable by fluorescence spectroscopy.
  • The temperature for nanoscale Lo domain formation increases with GM1 content.
  • A morphological phase diagram revealed distinct regions of micro-, nano-, and homogeneous phase separation.

Conclusions:

  • Lipid composition, specifically GM1 content, can control lipid raft domain existence and size.
  • GM1 stabilizes nanodomains by potentially affecting line tension and arresting domain growth.
  • This lipid-based mechanism highlights the ability of cells to modulate membrane phase behavior.