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Goitrous hypothyroidism due to iodide-trapping defect.

K Saito, K Yamamoto, S Yoshida

    The Journal of Clinical Endocrinology and Metabolism
    |December 1, 1981
    PubMed
    Summary

    This study describes a patient with goitrous hypothyroidism caused by an iodide-trapping defect. The defect was linked to impaired iodide transport, not Na+-K+-ATPase dysfunction, offering insights into thyroid hormone regulation.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Genetics

    Background:

    • Goitrous hypothyroidism can result from various defects in thyroid hormone synthesis.
    • Iodide trapping is a crucial initial step in thyroid hormone production.

    Observation:

    • A 32-year-old male presented with a progressively enlarging goiter and hypothyroidism.
    • Diagnostic tests revealed significantly low thyroidal radioiodide uptake and elevated thyroid-stimulating hormone (TSH).
    • Studies on thyroid tissue indicated impaired iodide trapping but normal Na+-K+-ATPase and elevated peroxidase activity.

    Findings:

    • The patient exhibited a defect in iodide trapping, evidenced by minimal radioiodide uptake and high urinary excretion.
    • Kinetic studies showed a significantly reduced thyroid-to-medium iodide concentration ratio in patient's thyroid slices.

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  • Microsomal peroxidase activity was elevated, suggesting a compensatory mechanism or a distinct defect.

    • Implications:

    • The findings suggest the iodide-trapping defect is due to a specific iodide transporter impairment.
    • This case highlights the importance of the iodide transport system in preventing hypothyroidism.
    • Understanding these defects can inform diagnosis and management of thyroid disorders.