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Related Experiment Videos

Thyroid dysfunction in megalin deficient mice.

Simonetta Lisi1, Cristina Segnani, Letizia Mattii

  • 1Department of Endocrinology and Metabolism, University of Pisa, Via Paradisa 2, 56124 Pisa, Italy.

Molecular and Cellular Endocrinology
|May 10, 2005
PubMed
Summary
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Megalin is crucial for thyroid hormone secretion, as megalin-deficient mice show reduced thyroglobulin and are hypothyroid. This highlights megalin's role in thyroid function.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Physiology

Background:

  • Megalin is a receptor protein known to be involved in the transport of various molecules.
  • Thyroglobulin (Tg) is the precursor to thyroid hormones, and its transport is essential for hormone secretion.
  • The precise role of megalin in thyroid hormone regulation and thyroglobulin (Tg) transport remains to be fully elucidated.

Purpose of the Study:

  • To investigate the function of megalin in thyroid hormone secretion and regulation.
  • To determine the impact of megalin deficiency on thyroid histology and function.
  • To compare thyroid function in megalin-deficient mice (megalin-/-) with wild-type (WT) mice.

Main Methods:

  • Comparative study of thyroid function and histology in megalin-deficient (megalin-/-) and wild-type (WT) mice.

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  • Measurement of serum thyroglobulin (Tg), free thyroxine (fT4), and thyroid-stimulating hormone (TSH) levels.
  • Histological examination of thyroid tissue.

    • Main Results:

    • Homozygous megalin-deficient mice (megalin-/-) exhibited significantly reduced serum Tg levels.
    • Megalin-/- mice were found to be hypothyroid, characterized by significantly reduced serum free thyroxine and significantly increased serum TSH levels.
    • Heterozygous megalin-deficient mice (megalin+/-) showed unaffected thyroid function.
    • No significant histological alterations or goiter were observed in megalin-/- mice despite the altered thyroid function.

    Conclusions:

    • Megalin plays a significant role in the transcytosis of thyroglobulin (Tg), facilitating thyroid hormone secretion.
    • Megalin deficiency leads to hypothyroidism due to impaired Tg transport and processing.
    • These findings underscore the importance of megalin in maintaining normal thyroid hormone homeostasis.