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Related Experiment Videos

DPH lifetime distributions in vesicles containing phospholipid hydroperoxides.

M L Wratten1, E Gratton, M van de Ven

  • 1Department of Pathology and Toxicology, University of Southern California, Los Angeles 90033.

Biochemical and Biophysical Research Communications
|October 16, 1989
PubMed
Summary

Phospholipid hydroperoxides increase membrane disorder, affecting molecular behavior within lipid bilayers. This study used multifrequency phase fluorometry to reveal altered fluorescence lifetimes in vesicles with hydroperoxides.

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Area of Science:

  • Biophysics
  • Membrane Biophysics
  • Lipid Bilayer Dynamics

Background:

  • Phospholipid hydroperoxides (PHPs) are key oxidation products in biological membranes.
  • Membrane structural integrity is crucial for cellular function.
  • Understanding lipid oxidation effects on membrane dynamics is vital.

Purpose of the Study:

  • To investigate the impact of phospholipid hydroperoxides on membrane structural heterogeneity.
  • To quantify changes in molecular dynamics within lipid bilayers containing oxidized phospholipids.
  • To determine the effect of hydroperoxides on the lifetime distributions of fluorescent probes.

Main Methods:

  • Multifrequency phase fluorometry was employed to measure fluorescence lifetimes.
  • 1,6-diphenyl-1,3,5-hexatriene (DPH) was used as a fluorescent probe.

Related Experiment Videos

  • Small unilamellar vesicles (SUVs) composed of 1-palmitoyl-2-linoleoyl phosphatidylcholine (PLPC) were prepared with and without 2% PHP incorporation.

    • Main Results:

    • A biexponential decay in fluorescence lifetime was observed for DPH in both control and PHP-containing vesicles.
    • Vesicles with incorporated phospholipid hydroperoxides exhibited a longer overall fluorescence lifetime.
    • A broader distribution in fluorescence lifetime width was noted in membranes containing hydroperoxides.

    Conclusions:

    • Phospholipid hydroperoxides induce significant structural heterogeneity in membrane lipid bilayers.
    • The observed changes in lifetime distributions suggest altered molecular packing and dynamics.
    • These findings highlight the detrimental structural impact of lipid oxidation on membrane organization.