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Interrelations of matrix lipids, vesicles, and calcification.

J T Irving

    Federation Proceedings
    |February 1, 1976
    PubMed
    Summary

    Phospholipids, specifically phosphatidyl serine and phosphatidyl inositol, initiate mineralization in calcifying tissues. These lipids are resistant to extraction before decalcification, playing a key role in apatite crystal formation.

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    Area of Science:

    • Biochemistry
    • Histology
    • Mineralization

    Background:

    • Mineralization is a complex biological process involving the deposition of calcium phosphate crystals.
    • The precise molecular mechanisms initiating biomineralization, particularly in calcifying tissues, remain incompletely understood.
    • Lipids have been implicated in various biomineralization processes, but their specific roles and identities are often unclear.

    Purpose of the Study:

    • To identify the substances responsible for initiating mineralization in calcifying tissues.
    • To investigate the biochemical nature and properties of these initiating substances.
    • To explore the potential role of identified substances in apatite crystal nucleation.

    Main Methods:

    • Extraction of calcifying tissues using hot pyridine or hot benzene.
    • Decalcification and staining with Sudan black B to visualize mineralization sites.
    • Histochemical analysis to determine the nature of stained substances.
    • Biochemical isolation and characterization of extracted lipids.

    Main Results:

    • Specific areas of initial mineralization stained intensely with Sudan black B after extraction and decalcification.
    • Histochemical analysis confirmed lipids as the responsible staining agents.
    • Biochemical isolation identified these lipids as phospholipids, predominantly phosphatidyl serine and phosphatidyl inositol.
    • These phospholipids demonstrated resistance to extraction prior to decalcification.

    Conclusions:

    • Phospholipids, particularly phosphatidyl serine and phosphatidyl inositol, are key components at the sites of initial mineralization in calcifying tissues.
    • The strong calcium-binding capacity of phosphatidyl serine suggests its role in nucleating apatite crystal formation.
    • The presence of phosphatidyl serine in matrix vesicles further supports its involvement in the initiation of calcification.

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