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Iodide modulation of Ca2+ efflux from mouse thyroid.

K Hashizume, M Kobayashi, T Onaya

    Endocrinologia Japonica
    |April 1, 1985
    PubMed
    Summary
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    Excess iodide inhibits thyroid calcium (Ca2+) efflux through two mechanisms: inhibiting adenylate cyclase and another distinct pathway. This dual action impacts thyroid function, particularly in iodine-deficient conditions.

    Area of Science:

    • Endocrinology
    • Cell Physiology
    • Thyroid Research

    Background:

    • Thyrotropin (TSH) stimulates calcium (Ca2+) efflux in mouse thyroid glands.
    • Previous studies suggested iodide inhibits TSH-stimulated Ca2+ efflux by affecting adenylate cyclase activity.
    • Iodide was also found to inhibit cyclic AMP-stimulated Ca2+ efflux, indicating an effect beyond initial cyclic AMP generation.

    Purpose of the Study:

    • To investigate if iodide inhibits Ca2+ efflux via a mechanism separate from adenylate cyclase inhibition.
    • To differentiate the effects of iodide on basal and TSH-stimulated Ca2+ efflux under different dietary iodine conditions.

    Main Methods:

    • Administering excess iodide to mice on regular and low-iodine diets.
    • Measuring basal and TSH-stimulated Ca2+ efflux rates in thyroid glands.

    Related Experiment Videos

  • Assessing cyclic AMP levels in thyroid tissues.

    • Main Results:

    • In mice on a regular diet, acute excess iodide did not alter basal Ca2+ efflux or TSH-stimulated efflux.
    • In mice on a low-iodine diet, iodide injection decreased basal Ca2+ efflux without changing cyclic AMP levels.
    • This iodide-induced decrease in Ca2+ efflux in low-iodine diet mice was not reversed by TSH in vitro.

    Conclusions:

    • Acute excess iodide inhibits thyroid Ca2+ efflux through at least two distinct mechanisms.
    • One mechanism involves the inhibition of adenylate cyclase, as previously suggested.
    • A second, distinct inhibitory action of iodide on Ca2+ efflux is evident, particularly under iodine-deficient conditions.