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Calcitonin effects on isolated bone cells.

M Shlossman, M Brown, E Shapiro

    Calcified Tissue International
    |March 1, 1982
    PubMed
    Summary
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    Calcitonin reduces calcium uptake in specific rat bone cells, particularly those involved in bone resorption. This suggests a role for cellular calcium and cyclic AMP in calcitonin's mechanism of action on osteoclast-like cells.

    Area of Science:

    • Endocrinology
    • Cell Biology
    • Bone Physiology

    Background:

    • Calcitonin is a hormone known to regulate calcium and bone metabolism.
    • Osteoclast-like cells are crucial for bone resorption, a process involving calcium release.

    Purpose of the Study:

    • To investigate the effect of calcitonin on calcium uptake in distinct rat bone cell populations.
    • To identify specific bone cell characteristics associated with calcitonin's action.

    Main Methods:

    • Sequential collagenase digestion of rat calvaria to isolate different bone cell populations.
    • Measurement of calcium uptake in response to calcitonin.
    • Assay of cyclic AMP levels, acid phosphatase, and alkaline phosphatase activity.
    • Assessment of the ability of cells to resorb prelabeled devitalized bone.

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    Main Results:

    • Calcitonin significantly decreased calcium uptake in specific bone cell populations.
    • These responsive cells exhibited increased cyclic AMP, high acid phosphatase, and resorptive capacity.
    • Calcitonin had no effect on cell populations with high alkaline phosphatase and no resorptive potential.

    Conclusions:

    • Calcitonin's effect on calcium uptake is specific to bone resorbing cells (osteoclast-like cells).
    • Cellular calcium and cyclic AMP levels appear to be involved in calcitonin's mechanism of action.
    • These findings contribute to understanding calcitonin's role in bone homeostasis.