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[The stratum corneum].

¹U. 346 INSERM affiliée au CNRS, Peau Humaine et Immunité , Hôpital E.-Herriot, 69437 Lyon.

Annales De Dermatologie Et De Venereologie

|April 27, 2002

Summary

The skin's stratum corneum forms a vital barrier, renewed by epidermal differentiation, protecting against water loss and external aggressors. Its integrity is crucial for skin health and drug delivery.

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Area of Science:

Dermatology
Cell Biology
Biophysics

Background:

Epidermal differentiation continuously renews the stratum corneum, a protective skin barrier.
The stratum corneum prevents water loss and shields against UV radiation, xenobiotics, and mechanical stress.
Its integrity relies on cell quality, cell junctions, and intercellular lipids.

Purpose of the Study:

To explore the multifaceted role of epidermal differentiation in maintaining skin barrier function.
To investigate factors perturbing stratum corneum integrity and barrier function.
To highlight the need for further research into epidermal barrier mechanisms for therapeutic and cosmetic applications.

Main Methods:

Review of existing literature on epidermal differentiation and stratum corneum function.
Analysis of factors affecting skin barrier integrity, including aging, disease, and treatments.
Examination of the stratum corneum's role in regulating penetration of allergens and topical drugs.

Main Results:

Perturbations in keratinocyte differentiation can impair epidermal barrier function.
Barrier quality varies by skin site, during healing, aging, and in various skin diseases.
Stratum corneum impermeability influences allergen and drug penetration.

Conclusions:

Understanding epidermal barrier function and stratum corneum cohesion/desquamation is essential for treating genetic diseases.
Further research can improve topical therapeutic efficacy and optimize cosmetic formulations.
The epidermal barrier's complex mechanisms require continued investigation.

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