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[Thyroid secretion in experimental hyperplasia (author's transl)]

P Nève, P Rocmans, P Ketelbant-Balasse

    Annales D'Endocrinologie
    |January 1, 1978
    PubMed
    Summary
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    Hyperactive thyroids release more thyroid hormones, independent of typical cellular mechanisms like phagocytosis. This suggests a unique secretion pathway in overactive thyroid conditions.

    Area of Science:

    • Endocrinology
    • Cell Biology
    • Thyroid Physiology

    Context:

    • Investigating the mechanisms of thyroid hormone secretion.
    • Utilizing in vivo and in vitro models of hyperthyroidism.
    • Examining the role of cellular structures in hormone release.

    Purpose:

    • To elucidate the mechanism of enhanced thyroid hormone secretion in hyperactive thyroid glands.
    • To determine if apical phagocytosis of colloid droplets is the primary driver of increased hormone release.
    • To assess the influence of specific inhibitors and temperature on hormone secretion.

    Summary:

    • Hyperactive dog thyroids, induced by TSH stimulation, showed increased in vitro release of butanol-extractable iodine (BE 125I) compared to resting thyroids.
    • Apical pseudopods and colloid droplets were rare in hyperactive thyroids.

    Related Experiment Videos

  • BE 125I release was resistant to cytochalasin B, microtubule, and metabolic inhibitors, decreasing only with temperature changes.

    • Impact:

    • Challenges the prevailing model of thyroid hormone secretion involving apical phagocytosis.
    • Suggests alternative, potentially temperature-sensitive, mechanisms for hormone release in hyperthyroidism.
    • Provides insights into the pathophysiology of thyroid hyperactivity and potential therapeutic targets.