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Substrate for Thyroid Hormone Synthesis: Biochemistry, Evolution, and Physiology.

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Thyroid hormone synthesis evolved with thyroglobulin, a protein essential for iodide storage and hormone production. Mutations impairing thyroglobulin iodination can lead to hypothyroidism and thyroid cell death, suggesting a link between hormone synthesis and cell survival.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Thyroid hormone synthesis evolved from using iodotyrosines to utilizing thyroglobulin (Tg) as a scaffold within thyroid follicles.
  • Thyroglobulin is crucial for storing iodide and synthesizing thyroid hormones (like thyroxine, T4) within the follicular lumen.
  • Thyroid hormone release involves endocytosis of Tg and lysosomal proteolysis, with iodide recycling.

Purpose of the Study:

  • To investigate the role of thyroglobulin in thyroid hormone synthesis and its implications in congenital hypothyroidism.
  • To explore the mechanisms underlying thyroid cell death in the absence of functional thyroglobulin iodination.
  • To identify potential back-up mechanisms linking thyroid hormone synthesis pathways to cell survival.

Main Methods:

  • Analysis of human patients with congenital hypothyroidism due to thyroglobulin mutations.
  • Examination of genetically modified mice lacking thyroglobulin.
  • Assessment of thyroidal endoplasmic reticulum (ER) stress and cell death markers.

Main Results:

  • Mutations impairing thyroglobulin iodination cause congenital hypothyroidism, yet some hormone production persists.
  • Goiter formation and significant thyrocyte death occur in patients and mice with bi-allelic thyroglobulin mutations.
  • Thyroid cell death in these models occurs independently of thyroidal ER stress, suggesting an alternative pathway.

Conclusions:

  • Thyroglobulin is indispensable for normal thyroid function and survival.
  • Thyroid cell death in the absence of thyroglobulin iodination points to a critical link between hormone synthesis machinery and cell fate.
  • A novel back-up mechanism may connect thyroid hormone synthesis pathways to thyroid cell death, warranting further investigation.