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Alterations in phospholipid polymorphism by polyethylene glycol.

L T Boni, T P Stewart, S W Hui

    The Journal of Membrane Biology
    |January 1, 1984
    PubMed
    Summary

    Polyethylene glycol (PEG) alters lipid structures, reducing spacing and increasing transition temperatures. These changes, linked to bilayer defects, suggest PEG

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    Area of Science:

    • Lipid Biophysics
    • Membrane Science
    • Polymer Science

    Background:

    • Lipid polymorphism describes the various structures lipids can form.
    • Polyethylene glycol (PEG) is a fusogenic agent known to induce membrane fusion.
    • Understanding PEG's interaction with lipid bilayers is crucial for applications in drug delivery and biotechnology.

    Purpose of the Study:

    • To investigate the effects of polyethylene glycol (PEG) on the physical properties and polymorphism of various lipids.
    • To elucidate the relationship between PEG-induced lipid alterations and its fusogenic capabilities.

    Main Methods:

    • X-ray diffraction to measure lamellar and hexagonal II repeat spacings.
    • Freeze-fracture electron microscopy to visualize bilayer defects.
    • Differential scanning calorimetry and 31P NMR to determine phase transition temperatures.

    Main Results:

    • PEG significantly reduced lamellar and hexagonal II repeat spacings in multiple lipid systems.
    • Increased gel to liquid crystalline and bilayer to hexagonal transition temperatures were observed.
    • PEG eliminated lipidic particles in mixtures containing unsaturated phosphatidylethanolamine and induced distinct bilayer defects.

    Conclusions:

    • PEG alters lipid polymorphism by reducing structural spacings and increasing transition temperatures.
    • The observed effects are consistent with PEG's fusogenic properties, potentially involving close bilayer contact and defect formation.
    • While dehydration may play a role, PEG's specific interactions are key to its fusogenic activity.

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