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Early persistent UVA-pigmentation: ultrastructural and morphometric analyses.

F Ryckmanns, C Schmoeckel, G Plewig

    Archives of Dermatological Research
    |January 1, 1987
    PubMed
    Summary
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    UV-A radiation causes skin pigmentation by increasing clear cells and melanosomes in melanocytic dendrites. This UV-A tanning process differs from UV-B or sun-induced tanning.

    Area of Science:

    • Dermatology
    • Photobiology
    • Skin Physiology

    Background:

    • Skin pigmentation, or tanning, is a complex biological response to ultraviolet (UV) radiation.
    • Understanding the specific mechanisms of UV-A-induced pigmentation is crucial for assessing its effects and developing protective strategies.

    Purpose of the Study:

    • To morphologically investigate UV-A-induced skin pigmentation.
    • To compare UV-A tanning with UV-B and sun-induced tanning at a cellular level.

    Main Methods:

    • Examination of semithin and thin skin sections from 11 volunteers after single and repeated UV-A irradiation doses (10, 50, 100 J/cm2).
    • Morphological analysis included counting clear cells, large clear cells, and melanosomes in melanocytic dendrites.
    • Comparison with non-irradiated, UV-B-irradiated, and suntanned skin controls.

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    Main Results:

    • Repeated UV-A irradiation led to increased numbers of clear cells (x1.6) and large clear cells (x1.7) in the basal layer.
    • Melanosome numbers in melanocytic dendrites significantly increased (x2.8) after repeated UV-A exposure.
    • UV-A did not alter melanosome complexes in keratinocytes, unlike suntanned skin which showed marked increases.

    Conclusions:

    • UV-A-induced skin pigmentation involves distinct cellular changes compared to UV-B or sun-induced melanogenesis.
    • The ultrastructural analysis suggests that the clinical degree of tanning may not directly correlate with these specific cellular changes.