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Related Experiment Videos

Mineralization by matrix vesicles.

H C Anderson

    Scanning Electron Microscopy
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Matrix vesicles initiate mineralization in cartilage and bone, confirmed by anhydrous electron microscopy. These vesicles concentrate calcium and phosphate, playing a key role in skeletal development and calcific diseases.

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    Area of Science:

    • Skeletal Biology
    • Biomineralization
    • Cell Biology

    Background:

    • Matrix vesicles are traditionally considered the primary sites for initial calcification in skeletal tissues.
    • Recent challenges questioned this role due to potential mineral dislocation during early preparation methods.

    Purpose of the Study:

    • To refute challenges regarding matrix vesicle calcification.
    • To elucidate the mechanisms of matrix vesicle biogenesis and mineralization.

    Main Methods:

    • Anhydrous electron microscopy techniques.
    • Electron probe analysis.
    • Review of evidence for matrix vesicle biogenesis mechanisms.

    Main Results:

    • Anhydrous methods and electron probe analysis confirm matrix vesicles are sites of initial mineralization.

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  • Matrix vesicles concentrate calcium and phosphate near their membrane, potentially via phospholipids and transmembrane phosphatases.
  • Alkaline phosphatase may act as a phosphotransferase, transporting phosphate across the vesicle membrane.

    • Conclusions:

    • Matrix vesicles are definitively involved in initiating mineralization in skeletal tissues.
    • Multiple mechanisms, including plasma membrane budding and cell degeneration, likely contribute to matrix vesicle formation.
    • Similar extracellular vesicles may initiate mineralization in various calcific diseases.