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Related Experiment Videos

Phase behavior of isolated skin lipids

J A Bouwstra1, G S Gooris, K Cheng

  • 1Leiden/Amsterdam Center for Drug Research, Gorlaeus Laboratories, Leiden University, The Netherlands.

Journal of Lipid Research
|May 1, 1996
PubMed
Summary

This study reveals how cholesterol and fatty acids influence the structure of ceramides, key skin lipids. Long-chain fatty acids are crucial for mimicking the natural lipid organization in the stratum corneum, essential for skin barrier function.

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Area of Science:

  • Biophysics
  • Materials Science
  • Dermatology

Background:

  • The stratum corneum (SC) lipid barrier is crucial for skin hydration and protection.
  • Ceramides, cholesterol, and free fatty acids are the main lipid components of the SC.
  • Understanding their phase behavior is key to developing effective skin barrier therapies.

Purpose of the Study:

  • To investigate the phase behavior of mixtures of ceramides, cholesterol, and free fatty acids.
  • To determine how varying molar ratios of these lipids affect their structural organization.
  • To compare the phase behavior of lipid mixtures with that of intact pig SC.

Main Methods:

  • Isolation of ceramides from pig stratum corneum.
  • Preparation of lipid mixtures with varying ratios of ceramides, cholesterol, and free fatty acids.

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  • Analysis of lipid phase behavior using small-angle X-ray diffraction (SAXD) and wide-angle X-ray diffraction (WAXD).

    • Main Results:

    • Ceramides alone showed no long-range ordering.
    • Addition of cholesterol to ceramides formed lamellar phases and hexagonal packing, mimicking SC.
    • Cholesterol/ceramide ratio influenced the formation and periodicity of lamellar phases (e.g., 5.2 nm and 12.2 nm).
    • Long-chain free fatty acids (C16-C26) were essential for mimicking the intact SC lipid structure, resulting in lamellar phases of 5.3 nm and 13.0 nm.
    • Short-chain fatty acids (C14-C18) induced an additional 4.2 nm phase.

    Conclusions:

    • Cholesterol is essential for forming ordered lamellar structures with ceramides.
    • The ratio of cholesterol to ceramides significantly impacts the resulting lipid phases.
    • Long-chain free fatty acids are critical for replicating the complex lipid organization of the stratum corneum, highlighting their importance in skin barrier function.