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Related Experiment Videos

Thyroid hormone action in mitochondria.

C Wrutniak-Cabello1, F Casas, G Cabello

  • 1UMR Différenciation Cellulaire et Croissance (INRA, Université Montpellier II, ENSAM), Unité d'Endocrinologie Cellulaire, INRA, 2 Place Viala, 34060 Montpellier Cedex 1, France.

Journal of Molecular Endocrinology
|February 15, 2001
PubMed
Summary

Triiodothyronine (T3) regulates mitochondrial activity through direct mitochondrial and nuclear pathways. The direct mitochondrial pathway, involving p43, rapidly stimulates mitochondrial protein synthesis and transcription, impacting metabolism and differentiation.

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Area of Science:

  • Cell Biology
  • Endocrinology
  • Mitochondrial Biology

Background:

  • Triiodothyronine (T3) is a key regulator of mitochondrial function.
  • Mitochondrial activity is influenced by both nuclear and extranuclear thyroid hormone actions.

Purpose of the Study:

  • To review evidence for a direct mitochondrial pathway of T3 action.
  • To clarify the relative importance of nuclear and mitochondrial pathways in T3-mediated mitochondrial regulation.

Main Methods:

  • Review of existing literature on T3 effects on mitochondrial oxygen consumption, protein synthesis, and gene expression.
  • Analysis of data on T3-binding sites and transcription factors within mitochondria.

Main Results:

  • Evidence supports both short-term (extranuclear) and delayed (nuclear) T3 effects on mitochondria.

Related Experiment Videos

  • A direct mitochondrial pathway involving a 43 kDa T3 receptor (p43) stimulates mitochondrial transcription and protein synthesis.
  • The c-erbAalpha gene encodes both nuclear and mitochondrial T3 receptors, coordinating gene expression.

    • Conclusions:

    • The direct mitochondrial T3 pathway is crucial for regulating fuel metabolism and cell differentiation.
    • T3's dual signaling pathways ensure coordinated regulation of mitochondrial and nuclear gene expression for development.