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Neonatal hyperthyroidism and long-acting thyroid stimulator protector.

J Nutt, F Clark, R G Welch

    British Medical Journal
    |December 21, 1974
    PubMed
    Summary
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    Neonatal hyperthyroidism may be caused by a different thyroid stimulator than previously thought. A specific human thyroid stimulator, not long-acting thyroid stimulator (LATS), was found in a mother whose baby had hyperthyroidism.

    Area of Science:

    • Endocrinology
    • Neonatal Medicine
    • Immunology

    Background:

    • Neonatal hyperthyroidism is typically attributed to maternal Graves' disease and transplacental transfer of long-acting thyroid stimulator (LATS).
    • The exact mechanisms and causative agents in all cases of neonatal hyperthyroidism require further elucidation.

    Purpose of the Study:

    • To investigate an alternative cause of neonatal hyperthyroidism in a case where LATS was not detected.
    • To identify the specific immunoglobulin responsible for neonatal hyperthyroidism in the presented case.

    Main Methods:

    • Serum analysis of mother and neonate for thyroid-stimulating immunoglobulins.
    • Detection assays for long-acting thyroid stimulator (LATS) and other specific human thyroid stimulators.

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    Main Results:

    • Long-acting thyroid stimulator (LATS) was undetectable in both the mother and the neonate.
    • A distinct immunoglobulin, identified as LATS protector (a specific human thyroid stimulator), was present in the maternal serum.
    • The presence of this specific thyroid stimulator correlated with the neonate's hyperthyroid condition.

    Conclusions:

    • Neonatal hyperthyroidism can result from transplacental passage of specific human thyroid stimulators other than LATS.
    • LATS protector may be an alternative causative agent for neonatal hyperthyroidism in mothers with Graves' disease.
    • Further research is warranted to understand the role of various thyroid-stimulating immunoglobulins in neonatal hyperthyroidism.