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Bone-derived factors active on bone cells.

S Mohan, T Linkhart, J Farley

    Calcified Tissue International
    |January 1, 1984
    PubMed
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    Local factors regulate bone volume independently of systemic hormones. These factors stimulate bone cell proliferation and matrix formation, highlighting crucial local control over bone metabolism.

    Area of Science:

    • Bone biology and skeletal physiology.
    • Endocrinology and local hormone action.

    Background:

    • Systemic calcium-regulating hormones are well-studied, but local bone volume regulation remains unclear.
    • Two local processes, coupling of bone formation/resorption and repletion of resorbed bone, function independently of systemic control.

    Purpose of the Study:

    • To investigate local mechanisms of bone volume regulation.
    • To identify and characterize factors involved in local bone metabolism.

    Main Methods:

    • In vitro culture of embryonic chick tibiae to study bone resorption and factor release.
    • Extraction and partial purification of factors from embryonic and adult bones, including human bone.
    • In vitro assays to assess the biological activity of extracted factors on bone cells.

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    Main Results:

    • Bone resorption in vitro releases a factor stimulating bone cell proliferation and matrix formation.
    • A similar factor, human skeletal growth factor, was isolated from human bone with comparable properties.
    • Various biologically active factors with chemotactic and mitogenic effects on bone cells have been identified.

    Conclusions:

    • Local factors play a significant role in bone volume regulation, independent of systemic control.
    • These findings emphasize the importance of local regulatory mechanisms in bone metabolism.