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Parathyroid hormone-lymphocyte interactions modulate bone resorption.

H M Perry

    Endocrinology
    |November 1, 1986
    PubMed
    Summary
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    The parathyroid hormone (PTH) fragment 1-34 activates immune cells, prompting lymphocytes to release factors that increase bone resorption. This effect is specific to PTH-(1-34) and requires cellular components for manifestation.

    Area of Science:

    • Immunology
    • Endocrinology
    • Bone Biology

    Background:

    • Parathyroid hormone (PTH) plays a crucial role in calcium homeostasis and bone metabolism.
    • The precise mechanisms by which PTH influences bone resorption at the cellular level are complex and involve interactions with various cell types.

    Purpose of the Study:

    • To investigate the effect of the biologically active PTH fragment 1-34 on mononuclear leukocytes and their role in bone resorption.
    • To identify the specific cell types involved and the nature of the secreted factors.

    Main Methods:

    • Organ culture system to assay bone resorption.
    • Incubation of mononuclear leukocytes with PTH-(1-34), other hormones, and inactive PTH fragments.
    • [3H]thymidine incorporation to assess lymphocyte activation.

    Related Experiment Videos

  • Characterization of secreted factors from stimulated lymphocyte supernatants.

    • Main Results:

    • PTH-(1-34) induces mononuclear leukocytes to produce a substance(s) that increases bone resorption within 2-7 days.
    • Activated nonadherent lymphocytes (likely T-cells) are responsible for secreting this factor.
    • The response is specific to PTH-(1-34) and requires cellular components; the factor is heat-sensitive and has a molecular radius between 14,000 and 50,000 daltons.

    Conclusions:

    • PTH-(1-34) specifically activates lymphocytes to produce a bone resorption-inducing factor.
    • Lymphocyte activation is a necessary but not sufficient condition for modulating bone resorption.
    • The secreted factor's characteristics suggest a protein mediator involved in PTH-induced bone remodeling.