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Related Experiment Videos

Hexadecylphosphocholine interaction with lipid monolayers.

Michaëlle Rakotomanga1, Philippe M Loiseau, Michèle Saint-Pierre-Chazalet

  • 1UMR CNRS 7033 Université Pierre et Marie Curie-Paris VI, Paris, France.

Biochimica Et Biophysica Acta
|March 9, 2004
PubMed
Summary
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Miltefosine (HePC), an oral drug for visceral leishmaniasis, interacts with lipid membranes. It shows high affinity for sterols, integrating without disrupting membrane integrity.

Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Pharmacology

Background:

  • Visceral leishmaniasis (VL) is a fatal parasitic disease.
  • Miltefosine (hexadecylphosphocholine, HePC) is an orally active drug for VL.
  • Understanding HePC's interaction with cell membranes is crucial for its therapeutic application.

Purpose of the Study:

  • To investigate the interaction of HePC with lipid monolayers, specifically beta-palmitoyl-gamma-oleyl-phosphatidylcholine (POPC) and sterols (ergosterol, cholesterol).
  • To elucidate the mechanism of HePC adsorption and its effect on membrane models.

Main Methods:

  • Langmuir monolayer technique at a constant surface pressure of 25 mN/m.
  • Analysis of adsorption kinetics and mixture behavior of HePC with POPC and sterols at the air-water interface.

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Main Results:

  • HePC monomers insert into POPC or sterol monolayers until the critical micellar concentration (CMC).
  • Above CMC, HePC micelles form at the interface.
  • HePC exhibits simple miscibility with POPC but high affinity and condensation with sterols.
  • HePC does not disrupt membrane integrity.

Conclusions:

  • HePC integrates into lipid membranes, with a notable affinity for sterols.
  • The drug's interaction mechanism involves monomer insertion and micelle formation.
  • HePC's membrane-compatible behavior supports its use as an oral VL treatment.