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Alterations in membrane fluidity during keratinocyte differentiation measured by fluorescence polarization
H Hachisuka1, H Nomura, O Mori
1Department of Dermatology, Kurume University School of Medicine, Japan.
Cell and Tissue Research
|April 1, 1990
Summary
Guinea-pig epidermal cells show decreased membrane fluidity as they mature. This study reveals that basal keratinocytes have higher membrane fluidity than spinous and granular cells.
Area of Science:
- Dermatology
- Cell Biology
- Biophysics
Background:
- The epidermis differentiates keratinocytes from basal to granular layers.
- Understanding cell membrane properties is crucial for epidermal function.
Purpose of the Study:
- To investigate changes in keratinocyte membrane fluidity during epidermal differentiation.
- To correlate membrane fluidity with keratinocyte maturation stages.
Main Methods:
- Separated guinea-pig epidermal keratinocytes into high (basal), intermediate (spinous), and low (granular) density fractions using density-gradient centrifugation.
- Measured membrane fluidity using diphenylhexatriene fluorescence polarization.
Main Results:
- Keratinocyte membrane fluidity, indicated by a lower polarization (p)-value, was higher in basal cells (HDF) compared to spinous (IDF) and granular (LDF) cells.
- Membrane fluidity decreased with increasing cell density and maturation stage.
- A negative correlation was observed between polarization (p)-value and temperature.
Conclusions:
- Keratinocyte membrane fluidity decreases significantly during epidermal cell maturation.
- Basal keratinocytes exhibit higher membrane fluidity than more differentiated spinous and granular cells.