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A hormone for all seasons.

Jamshed R Tata1

  • 1National Institute for Medical Research, Mill Hill, London, UK. jtata@nimr.mrc.ac.uk

Perspectives in Biology and Medicine
|January 30, 2007
PubMed
Summary
This summary is machine-generated.

Thyroid hormone (TH) regulates growth, development, and metabolism through complex mechanisms. Its receptors, TR alpha and TR beta, act as transcription factors, influencing gene expression within chromatin structure.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Thyroid hormone (TH) mediates diverse physiological responses, including growth, development, and metabolic regulation.
  • Multiple, sometimes conflicting, mechanisms have been proposed for TH action.
  • The discovery of thyroid hormone receptors (TRs) in the 1980s highlighted their role as transcription factors.

Purpose of the Study:

  • To review the historical and current understanding of thyroid hormone's mechanisms of action.
  • To emphasize the role of TR alpha and TR beta in transcriptional regulation.
  • To discuss the involvement of co-activators, co-repressors, and chromatin structure in TH signaling.

Main Methods:

  • Literature review and chronological examination of research on hormone action.

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  • Focus on the structural homology of TRs with nuclear receptor transcription factors.
  • Analysis of TH receptor interactions within multi-protein complexes and chromatin.

    • Main Results:

    • TH actions are broadly categorized into growth/development and metabolic regulation.
    • TR alpha and TR beta function as ligand-inducible transcription factors.
    • TH signaling involves complex interactions within chromatin, mediated by co-activators and co-repressors.

    Conclusions:

    • Thyroid hormone action is primarily mediated by transcriptional regulation through TR alpha and TR beta.
    • The intricate interplay of receptors, co-regulators, and chromatin defines TH's diverse biological effects.
    • Further research is needed to fully elucidate the multifaceted mechanisms of thyroid hormone action.