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Related Experiment Videos

Oxidized phospholipids induce phase separation in lipid vesicles.

Francesco M Megli1, Luciana Russo, Karen Sabatini

  • 1Dipartimento di Biochimica e Biologia Molecolare, Università di Bari, Via E. Orabona, 4-70126 Bari, Italy. f.m.megli@biologia.uniba.it

FEBS Letters
|August 16, 2005
PubMed
Summary

Oxidized phospholipids (LPPCox) induce membrane phase separation in rigid DPPC-rich lipid bilayers, but not in fluid LPPC-rich ones. This effect is more pronounced at lower temperatures.

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Area of Science:

  • Membrane biophysics
  • Lipid oxidation
  • Phase separation

Background:

  • Phospholipid multilamellar vesicles (MLVs) are model systems for cell membranes.
  • Lipid oxidation can alter membrane properties, affecting fluidity and integrity.
  • Understanding these changes is crucial for cell function and disease research.

Purpose of the Study:

  • To investigate the impact of oxidized 1,2-lignoceric-2-docosahexaenoyl-sn-glycero-3-phosphocholine (LPPCox) on the thermal behavior and fluidity of dipalmitoylphosphatidylcholine (DPPC) and 1,2-lignoceric-2-docosahexaenoyl-sn-glycero-3-phosphocholine (LPPC) mixtures.
  • To determine how varying molar percentages of DPPC, LPPC, and LPPCox influence membrane phase separation and fluidity.
  • To elucidate the role of temperature in modulating these effects.

Main Methods:

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  • Electron Paramagnetic Resonance (EPR) spectroscopy was employed to study membrane fluidity.
  • A spin label (n-DSPC) was used to probe the microenvironment within MLVs.
  • Ternary mixtures of DPPC, LPPC, and LPPCox were prepared at various molar percentages.
  • Experiments were conducted across a temperature range of 4 to 44 degrees C.

Main Results:

  • LPPCox at high percentages hindered MLV formation.
  • Lower LPPCox percentages, particularly in DPPC-rich mixtures, induced phase separation, evidenced by two-component EPR spectra.
  • LPPC-rich mixtures remained homogeneous, showing simple EPR spectra, even with LPPCox present.
  • Phase separation was more distinct at lower temperatures (≤12°C) and diminished at higher temperatures (≥36°C).
  • The correlation time of the spin label was unaffected by LPPCox in LPPC-rich membranes but increased with DPPC content in homogeneous membranes.

Conclusions:

  • Oxidized lipids (LPPCox) act as phase separators in more rigid, DPPC-rich membranes.
  • Membrane fluidity remains largely unaffected by LPPCox in more fluid, LPPC-rich membranes.
  • Temperature significantly influences the extent of phase separation induced by oxidized lipids.