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Calcitonin secretion in thyroid insufficiency.

I Gozariu, E Dumitru, I Duncea

    Endocrinologie
    |October 1, 1983
    PubMed
    Summary
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    Severe hypothyroidism patients show maintained calcitonin secretion, indicating robust skeletal integrity despite the condition. This calcitonin response helps explain their relatively healthy bones.

    Area of Science:

    • Endocrinology
    • Calcium Metabolism
    • Skeletal Physiology

    Background:

    • Severe hypothyroidism can impact mineral metabolism and bone health.
    • Calcitonin plays a role in calcium regulation and bone homeostasis.
    • Understanding calcitonin's role in hypothyroidism is crucial for bone health management.

    Purpose of the Study:

    • To investigate calcitonin secretion levels in patients with severe hypothyroidism.
    • To assess the relationship between calcitonin levels and calcium metabolism under basal and stimulated conditions.
    • To evaluate the impact of hypothyroidism on skeletal calcium uptake.

    Main Methods:

    • Radioimmunoassay (RIA) was used to measure circulating calcitonin levels.
    • Phosphorus-calcium metabolism was comprehensively studied.

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  • Measurements were taken under basal conditions and after intravenous calcium loading.

    • Main Results:

    • Patients exhibited low basal urinary calcium excretion.
    • Skeletal calcium uptake increased significantly after calcium loading.
    • Calcitonin secretion persisted in 8 patients basally and increased in 14 post-loading, suggesting enhanced skeletal calcium avidity.

    Conclusions:

    • Persistent calcitonin secretion in hypothyroidism supports the relative integrity of the skeleton.
    • The observed calcitonin response may contribute to maintaining bone health in hypothyroid individuals.
    • Goiter presence did not alter these findings in hypothyroid patients.