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Sphingomyelinase in pig and human epidermis.

P A Bowser, G M Gray

    The Journal of Investigative Dermatology
    |June 1, 1978
    PubMed
    Summary

    Epidermal sphingomyelinase, an enzyme breaking down sphingomyelin, was found in pig and human skin. Its properties suggest it is a lysosomal enzyme involved in skin lipid metabolism.

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    Area of Science:

    • Biochemistry
    • Dermatology
    • Enzymology

    Background:

    • Sphingomyelinase (sphingomyelin phosphorylcholine phosphohydrolase E.C.3.1.4.12) hydrolyzes sphingomyelin into ceramide and phosphorylcholine.
    • Understanding epidermal enzyme activity is crucial for skin barrier function and lipid metabolism research.

    Purpose of the Study:

    • To identify and characterize sphingomyelinase in pig and human epidermis.
    • To investigate the enzyme's subcellular localization, kinetic properties, and optimal conditions.

    Main Methods:

    • Enzyme assays were performed on subcellular fractions of pig and human epidermis.
    • pH optima, activation by Triton X-100, and solubilization methods were analyzed.
    • Kinetic parameters (Km) and inhibition patterns were determined.

    Main Results:

    • Sphingomyelinase activity was detected in both soluble and particulate epidermal fractions.
    • The enzyme exhibited optimal activity at pH 4.5-5 and was activated by Triton X-100.
    • Michaelis-Menten kinetics were observed, with apparent Km values of 4.5 x 10⁻⁵ M (pig) and 7.7 x 10⁻⁵ M (human).
    • The enzyme showed no specific metal ion requirements and was moderately inhibited by dithiothreitol.

    Conclusions:

    • Epidermal sphingomyelinase is likely a lysosomal enzyme due to its acidic pH optimum.
    • The findings suggest sphingomyelinase plays a significant role in epidermal lipid catabolism.
    • No evidence for phospholipase C activity was found, indicating alternative phosphatidylcholine degradation pathways may exist.

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