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Related Experiment Videos

A high affinity, calmodulin-responsive (Ca2+ + Mg2+)-ATPase in isolated bone cells.

V Shen, G Kohler, W A Peck

    Biochimica Et Biophysica Acta
    |January 19, 1983
    PubMed
    Summary

    Researchers identified a calcium-dependent ATPase in bone cells, crucial for regulating calcium (Ca2+) movement. This enzyme, sensitive to calmodulin, may play a key role in how hormones affect bone cell function.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Bone Biology

    Background:

    • Calcium (Ca2+) fluxes are critical for skeletal responses to hormones.
    • The precise mechanisms governing these Ca2+ fluxes in bone cells remain unclear.

    Purpose of the Study:

    • To investigate the presence and characteristics of Ca2+-dependent ATPase activity in osteoblast-like cells.
    • To determine the potential role of this enzyme in cellular Ca2+ regulation and hormonal responses.

    Main Methods:

    • Primary culture of osteoblast-like cells and osteosarcoma cells.
    • Isolation of plasma membrane fractions.
    • Enzyme assays to measure Ca2+-dependent ATPase activity.
    • Inhibition and activation studies using various ions, drugs, and calmodulin.

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    Main Results:

    • Two Ca2+-dependent ATPase components were identified in the plasma membrane fraction.
    • A high-affinity component (Km 280 nM) was characterized, requiring Mg2+ and sensitive to trifluoperazine and lanthanum.
    • This component showed calmodulin sensitivity, particularly after trifluoperazine treatment, and was located in a fraction enriched with plasma membrane markers.
    • Similar ATPase activities were observed in osteosarcoma cells.

    Conclusions:

    • Osteoblast-like cells possess a high-affinity, calmodulin-sensitive Ca2+-dependent ATPase in their plasma membrane.
    • This enzyme likely contributes to the regulation of Ca2+ fluxes within bone cells.
    • It may be involved in the mechanism by which hormones influence bone cell function.