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Related Experiment Videos

Lipid composition effect on permeability across PAMPA.

Paul R Seo1, Zeynep S Teksin, Joseph P Y Kao

  • 1Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201, USA.

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
|June 20, 2006
PubMed
Summary

The parallel artificial membrane permeability assay (PAMPA) lipid composition influences drug permeability. Changes in membrane fluidity and ion pairing affect how compounds like benzoic acid and metoprolol cross the artificial membrane.

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Area of Science:

  • Pharmacology
  • Biophysical Chemistry
  • Drug Discovery

Background:

  • The parallel artificial membrane permeability assay (PAMPA) is a valuable tool for screening drug candidate passive permeability.
  • However, its lipid membrane structure and function are not well-understood.
  • Understanding lipid composition's role is crucial for optimizing PAMPA's predictive power.

Purpose of the Study:

  • To investigate how varying PAMPA lipid composition affects the permeability of five model compounds.
  • To explore the relationship between membrane fluidity, lipid head group, acyl chain unsaturation, and compound transport.
  • To elucidate the mechanisms influencing drug permeability in PAMPA.

Main Methods:

  • Utilized the PAMPA system with individual phospholipids varying in phosphate head group and acyl chain unsaturation.

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  • Measured the transport of benzoic acid, taurocholic acid, metoprolol, sucrose, and mannitol.
  • Assessed membrane fluidity using 1,3-diphenylhexatriene fluorescence anisotropy.

    • Main Results:

    • Compound permeability showed differential sensitivity to PAMPA lipid composition.
    • Benzoic acid permeability varied 51-fold, indicating acyl chain effects on membrane fluidity.
    • Metoprolol permeability varied 17-fold, with high transport across phosphatidylserine due to ion pair effects.
    • Mannitol, sucrose, and taurocholic acid permeabilities were low and unaffected by lipid composition.
    • Phosphatidylcholines exhibited lower permeability, consistent with higher membrane rigidity.

    Conclusions:

    • PAMPA lipid composition significantly modulates drug permeability for compounds with appreciable transport rates.
    • Membrane fluidity and ion pair effects appear to be key factors influencing permeability.
    • Further research is needed to fully elucidate PAMPA's structure-function relationship for improved drug screening.