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Related Experiment Videos

Actinic elastosis in black skin. A light- and electronmicroscopic study.

F Nürnberger, E Schober, W C Marsch

    Archives of Dermatological Research
    |June 29, 1978
    PubMed
    Summary

    Actinic elastosis, characterized by abnormal elastic fibers, was observed in two elderly Black individuals, challenging previous assumptions. This suggests UV-altered fibroblasts may synthesize elastotic material in Black skin.

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    Area of Science:

    • Dermatology and Cutaneous Biology
    • Skin Aging Research
    • Photodermatology

    Background:

    • Actinic elastosis is commonly associated with chronic sun exposure and is generally considered rare in individuals with darker skin tones.
    • Previous research suggests that Black individuals exhibit a lower prevalence of actinic elastosis compared to other ethnic groups.

    Purpose of the Study:

    • To investigate the presence and characteristics of dermal alterations, specifically actinic elastosis, in South African Black volunteers with varying degrees of sun exposure.
    • To compare age-dependent and actinic changes in dermal structures between sun-exposed and non-exposed skin in Black individuals.

    Main Methods:

    • Light and electron microscopy were employed to examine skin biopsies from 9 dermatologically normal South African Black volunteers aged 1-72 years.

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  • Skin samples from both sunlight-exposed and non-exposed areas were analyzed, with a focus on dermal structures and elastic fibers.

    • Main Results:

    • Two elderly Black volunteers (72 years old) displayed typical signs of dermal elastosis, with one case showing marked elastosis detectable by light microscopy.
    • In contrast, only age-related elastic fibers were found in the lower dermis of sun-exposed skin and in all dermal layers of unexposed skin.
    • These findings contradict the prevailing view that actinic elastosis is absent in Black individuals.

    Conclusions:

    • The study presents evidence of actinic elastosis in Black individuals, challenging established dermatological understanding.
    • The observed elastotic material is proposed to be a de novo synthesized pathological product originating from chronically UV-altered fibroblasts.
    • Further research is warranted to elucidate the mechanisms and prevalence of actinic elastosis in diverse skin types.