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Related Experiment Videos

Retinoid effects on epidermal structure, differentiation, and permeability

P M Elias, P O Fritsch, M Lampe

    Laboratory Investigation; a Journal of Technical Methods and Pathology
    |June 1, 1981
    PubMed
    Summary

    Retinoids disrupt skin barrier function by causing epidermal loosening and altering water loss, not by affecting lipids or causing mucous metaplasia. This reveals key mechanisms behind retinoid antikeratinizing activity.

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    Area of Science:

    • Dermatology
    • Cell Biology
    • Biochemistry

    Background:

    • Retinoids are known to significantly impact epidermal differentiation.
    • The precise antikeratinizing activity and mechanism of retinoids remain largely unknown.
    • Understanding retinoid action is crucial for dermatology and skin biology research.

    Purpose of the Study:

    • To investigate the antikeratinizing activity and mechanism of retinoids.
    • To correlate morphologic and histochemical changes with epidermal barrier function.
    • To assess stratum cohesion and water barrier integrity in retinoid-treated mice.

    Main Methods:

    • Adult hairless mice were treated with 13-cis-retinoic acid or RO 10-9359.
    • Transepidermal water loss (TEWL) was measured to assess barrier function.

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  • Morphologic and histochemical analyses were performed, including assessment of stratum cohesion, desmosomes, and intercellular material.

    • Main Results:

    • Both retinoids caused dose-dependent increases in TEWL, with RO 10-9359 showing a greater effect.
    • Epidermal and stratum corneum loosening occurred, evidenced by friction blisters and easy cell removal.
    • Dyshesion correlated with desmosome loss and amorphous material accumulation, but not with mucous metaplasia or altered membrane sugars.

    Conclusions:

    • Retinoid antikeratinizing activity involves dose-dependent alterations in TEWL and epidermal/stratum corneum loosening.
    • Loss of epidermal cohesion and abnormal barrier function are consequences of retinoid-induced loosening.
    • Mucous metaplasia and stratum corneum thinning are not primary mechanisms of retinoid action.