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The stratum granulosum: a contractile system.

W B Shelley, L Juhlin

    The British Journal of Dermatology
    |February 1, 1980
    PubMed
    Summary

    Cow hoof epidermis stratum granulosum contracts with ATP and calcium. This response, unique to this layer, suggests keratohyalin granules act as contractile proteins.

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    Area of Science:

    • Biochemistry
    • Dermatology
    • Cell Biology

    Background:

    • The epidermis, particularly the stratum granulosum, plays a crucial role in skin structure and barrier function.
    • Understanding the cellular mechanisms underlying epidermal responses to stimuli is vital for dermatological research.

    Purpose of the Study:

    • To investigate the contractile properties of different layers of the cow hoof epidermis.
    • To identify the specific cellular components and biochemical pathways involved in epidermal contraction.

    Main Methods:

    • Glycerinated cow hoof epidermis sheets were exposed to adenosine triphosphate (ATP) and calcium.
    • The effects of dopamine and other pharmacological agents on epidermal contraction were tested.
    • Inhibitory effects of ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (EGTA), lidocaine, and high potassium concentrations were assessed.

    Main Results:

    • Sheets of the stratum granulosum exhibited immediate contraction upon exposure to ATP in the presence of calcium.
    • Dopamine also induced contraction in the stratum granulosum, while other epidermal layers remained unresponsive.
    • Contraction was inhibited by EGTA, lidocaine, and high potassium concentrations.

    Conclusions:

    • The stratum granulosum of the cow hoof epidermis possesses unique contractile properties.
    • Keratohyalin granules are postulated to be the contractile protein responsible for the observed ATP- and calcium-induced contractions.
    • These findings offer new insights into the mechanical behavior and cellular components of the epidermis.

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