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Cutis laxa. Ultrastructural and biochemical studies.

K Hashimoto, T Kanzaki

    Archives of Dermatology
    |July 1, 1975
    PubMed
    Summary

    Electron microscopy revealed abnormal elastic fibers in both acquired and congenital cutis laxa. Elastin deficiency and microfilament presence were key findings in these rare genetic skin conditions.

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    Area of Science:

    • Dermatology
    • Genetics
    • Electron Microscopy

    Background:

    • Cutis laxa is a rare connective tissue disorder characterized by loose, sagging skin.
    • It can be inherited (congenital) or acquired later in life.
    • The underlying ultrastructural defects in elastic fibers are not fully understood.

    Purpose of the Study:

    • To investigate the ultrastructural changes in elastic fibers in both congenital and acquired cutis laxa using electron microscopy.
    • To compare the findings between the two forms of the disease.

    Main Methods:

    • Electron microscopy was used to examine skin and vascular specimens from one case each of acquired and congenital cutis laxa.
    • Detailed analysis of elastic fibers, collagen, and anchoring fibrils was performed.

    Main Results:

    • Both acquired and congenital cutis laxa showed diminished elastin and visible microfilaments within elastic fibers.
    • Deficiencies in electron-dense layers of elastic fibers were observed, with more pronounced aggregation in the congenital form.
    • Vascular changes included deficient elastin deposition and microfilament admixture, while arterial basal lamina showed multiplication.
    • Collagen fibers and anchoring fibrils remained normal.

    Conclusions:

    • Electron microscopy reveals significant ultrastructural abnormalities in elastic fibers affecting both skin and vasculature in cutis laxa.
    • These findings highlight elastin degradation and abnormal matrix deposition as key pathological features.
    • The study provides detailed ultrastructural insights into the pathogenesis of cutis laxa.

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