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Related Experiment Videos

Cartilage calcification: normal and aberrant.

A L Boskey, P G Bullough

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

    Pathologic hydroxyapatite (HA) and calcium pyrophosphate dihydrate (CPPD) crystal deposition involves increased ion concentrations and altered matrix components. HA deposits show elevated calcium acidic phospholipid phosphate complexes and reduced hexosamine.

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    Area of Science:

    • Biomineralization
    • Crystallography
    • Biochemistry

    Background:

    • Hydroxyapatite (HA) crystal deposition is a normal process in cartilage for endochondral ossification.
    • Chondrocytes and extracellular factors regulate HA crystal formation, growth, and orientation.

    Purpose of the Study:

    • To analyze and compare the crystallographic, histologic, and chemical properties of pathologic HA and calcium pyrophosphate dihydrate (CPPD) deposits.
    • To elucidate the matrix differences between pathologic HA and CPPD depositions.

    Main Methods:

    • Crystallographic, light microscopy, scanning electron microscopy, transmission electron microscopy, and chemical analyses were performed.
    • Pathologic deposits from 48 patients (27 HA, 21 CPPD) were compared to normal controls.

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    Main Results:

    • Both HA and CPPD deposition are associated with elevated ionic concentrations, exposed mineral nucleators, and reduced mineral inhibitors.
    • Pathologic HA deposits exhibit increased calcium acidic phospholipid phosphate complexes and decreased hexosamine concentrations in their matrices.
    • CPPD deposit matrices share similarities but lack the elevated calcium acidic phospholipid phosphate complexes seen in HA.

    Conclusions:

    • Pathologic biomineralization, including HA and CPPD deposition, is influenced by matrix composition and ionic balance.
    • Specific matrix alterations, such as elevated calcium acidic phospholipid phosphate complexes, characterize pathologic hydroxyapatite deposition.