Advertisement

Activation and inactivation of thyroid hormone by deiodinases: Local action with general consequences

  • B. Gereben
  • A. Zeöld
  • M. Dentice
  • D. Salvatore
  • A. C. Bianco
Review

Abstract.

The thyroid hormone plays a fundamental role in the development, growth, and metabolic homeostasis in all vertebrates by affecting the expression of different sets of genes. A group of thioredoxin fold-containing selenoproteins known as deiodinases control thyroid hormone action by activating or inactivating the precursor molecule thyroxine that is secreted by the thyroid gland. These pathways ensure regulation of the availability of the biologically active molecule T3, which occurs in a time-and tissue-specific fashion. In addition, because cells and plasma are in equilibrium and deiodination affects central thyroid hormone regulation, these local deiodinase-mediated events can also affect systemic thyroid hormone economy, such as in the case of non-thyroidal illness. Heightened interest in the field has been generated following the discovery that the deiodinases can be a component in both the Sonic hedgehog signaling pathway and the TGR-5 signaling cascade, a G-protein-coupled receptor for bile acids. These new mechanisms involved in deiodinase regulation indicate that local thyroid hormone activation and inactivation play a much broader role than previously thought.

Keywords.

Thyroid hormone metabolism deiodinases non-thyroidal illness syndrome obesity Sonic hedgehog pathway bile acid 

Copyright information

© Birkhaueser 2007

Authors and Affiliations

  • B. Gereben
    • 1
  • A. Zeöld
    • 1
  • M. Dentice
    • 2
  • D. Salvatore
    • 2
  • A. C. Bianco
    • 3
  1. 1.Laboratory of Endocrine Neurobiology, Institute of Experimental MedicineHungarian Academy of SciencesBudapestHungary
  2. 2.Dipartimento di Endocrinologia ed Oncologia Molecolare e Clinica, Facoltà di Medicina e ChirurgiaUniversità degli Studi di Napoli ”Federico II”NaplesItaly
  3. 3.Thyroid Section, Division of Endocrinology, Diabetes and HypertensionBrigham and Women’s Hospital and Harvard Medical SchoolBostonUSA

Personalised recommendations