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Stratum corneum swelling. Biophysical and computer assisted quantitative assessments
L Norlén1, A Emilson, B Forslind
1Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden. lnorlen@mango.mef.ki.se
Archives of Dermatological Research
|August 1, 1997
Summary
Stratum corneum swelling, crucial for skin barrier function, increases with temperature and is reduced by removing intercellular lipids. This indicates lipids play a key role in the stratum corneum
Area of Science:
- Dermatology
- Biophysics
- Materials Science
Background:
- The stratum corneum provides the primary barrier function of the skin.
- Understanding its physical properties, such as swelling, is essential for assessing skin health and developing effective treatments.
Purpose of the Study:
- To investigate and characterize the swelling behavior of human stratum corneum.
- To determine the influence of temperature and intercellular lipids on stratum corneum swelling.
Main Methods:
- Stratum corneum samples from female donors were incubated in distilled water at 20°C and 45°C.
- Samples were either untreated or pre-extracted with chloroform-methanol to remove lipids.
- Area enlargement was measured photographically, and thickness enlargement was determined using confocal laser scanning microscopy.
Main Results:
- Stratum corneum exhibited significant swelling, most pronounced in thickness (26.3% ± 16.3%) after 90 minutes.
- Lipid removal via chloroform-methanol extraction significantly decreased swelling (P < 0.01).
- Increased water temperature from 20°C to 45°C significantly enhanced swelling (P < 0.01).
Conclusions:
- Stratum corneum swelling is primarily influenced by its intercellular lipid structure.
- The findings suggest a direct link between lipid composition, swelling dynamics, and the skin's barrier function.
- This research provides insights into the physical mechanisms underlying skin hydration and barrier integrity.