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Rat myoblast fusion requires metalloendoprotease activity

C B Couch, W J Strittmatter

    Cell
    |January 1, 1983
    PubMed

    Insights

    Calcium-dependent myoblast fusion requires a neutral metalloendoprotease. Inhibitors of this enzyme and its substrates block fusion, confirming its essential role in muscle cell development.

    Area of Science:

    • Cell Biology
    • Biochemistry
    • Muscle Development

    Background:

    • Myoblast fusion is crucial for skeletal muscle formation.
    • The molecular mechanisms regulating myoblast fusion are not fully understood.

    Purpose of the Study:

    • To investigate the role of metalloendoprotease activity in calcium-dependent myoblast fusion.
    • To identify and characterize the metalloendoprotease involved in this process.

    Main Methods:

    • Utilized cultured rat myoblasts and multinucleate myotubes.
    • Employed metalloendoprotease inhibitors and synthetic dipeptide substrates.
    • Assayed metalloendoprotease activity in myoblast membranes using a fluorogenic protease substrate.

    Main Results:

    • Calcium-dependent myoblast fusion was inhibited by metalloendoprotease inhibitors and specific substrates.
    • Metalloendoprotease activity was detected in myoblast membranes.
    • The identified activity was sensitive to the same inhibitors that prevent myoblast fusion.

    Conclusions:

    • A neutral metalloendoprotease is essential for calcium-dependent myoblast fusion.
    • This enzyme activity, localized in myoblast membranes, plays a critical role in muscle cell differentiation and development.

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