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Cholesterol displacement from membrane phospholipids by hexadecanol.

Maria K Ratajczak1, Y T Chris Ko, Yvonne Lange

  • 1Department of Physics, Institute for Biophysical Dynamics and James Franck Institute, The University of Chicago, Chicago, IL 60637, USA.

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1-hexadecanol (HD) forms complexes with phospholipids, displacing cholesterol and increasing its chemical activity. This membrane intercalator mimics cholesterol's role in promoting ordered lipid domains.

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Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Lipid Chemistry

Background:

  • Cholesterol addition to phospholipid monolayers induces liquid-ordered and liquid-disordered domain separation.
  • Ordered phases suggest stoichiometric complexes of cholesterol and phospholipids.
  • Complexed cholesterol exhibits lower chemical activity than free sterol.

Purpose of the Study:

  • To test if 1-hexadecanol (HD) associates with phospholipids, displacing cholesterol.
  • To investigate HD's role in promoting liquid-ordered domains.
  • To determine if HD increases the chemical activity of cholesterol.

Main Methods:

  • Studying phase behavior of mixed phospholipid, sterol, and alcohol monolayers.
  • Analyzing cholesterol transfer from monolayers to aqueous cyclodextrin in the presence of HD.
  • Comparing HD-phospholipid interactions with cholesterol-phospholipid interactions.

Main Results:

  • 1-hexadecanol (HD) forms highly condensed domains in pure phospholipid monolayers.
  • HD substitutes for cholesterol mole-for-mole in promoting liquid-ordered domains.
  • HD enhances cholesterol efflux to cyclodextrin by displacing it from phospholipids, increasing free cholesterol.

Conclusions:

  • HD forms complexes with dimyristoylphosphatidylcholine similar to cholesterol.
  • HD competitively displaces cholesterol from phospholipids.
  • HD increases cholesterol's chemical activity by increasing the uncomplexed sterol concentration.