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Protein kinase C activators modulate differentiated thyroid function in vitro.

J Ginsberg, P G Murray

    FEBS Letters
    |October 6, 1986
    PubMed
    Summary
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    Phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA) inhibits thyroid function by activating protein kinase C. This study confirms TPA

    Area of Science:

    • Endocrinology
    • Cell Biology
    • Biochemistry

    Background:

    • Differentiated thyroid function is crucial for hormone production.
    • Phorbol esters are known to modulate cellular processes.
    • The role of protein kinase C in thyroid cell regulation requires further elucidation.

    Purpose of the Study:

    • To investigate if protein kinase C activation mediates the inhibitory effect of phorbol esters on thyroid function.
    • To determine the specific phorbol esters involved in this mechanism.
    • To explore the cellular localization of protein kinase C during phorbol ester exposure.

    Main Methods:

    • Exposure of porcine thyroid cells to various phorbol esters and a diacylglycerol analogue.
    • Measurement of TSH-stimulated iodine organification.

    Related Experiment Videos

  • Assessment of protein kinase C translocation using biochemical assays.

    • Main Results:

    • TPA, phorbol 12,13-didecanoate, and phorbol 12,13-dibutyrate significantly inhibited iodine organification.
    • Non-tumor promoting phorbol esters had no effect.
    • TPA induced the translocation of protein kinase C from the cytosol to the membrane.

    Conclusions:

    • The inhibitory effects of phorbol esters on porcine thyroid cells are mediated by protein kinase C activation.
    • Protein kinase C translocation is a key event in the mechanism of phorbol ester action on thyroid function.
    • These findings provide in vitro evidence for the role of protein kinase C in regulating differentiated thyroid function.