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T3 levels and thyroid hormone signaling.

Federico Salas-Lucia1, Antonio C Bianco1

  • 1Section of Adult and Pediatric Endocrinology and Metabolism, The University of Chicago, Chicago, IL, United States.

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Summary

Serum triiodothyronine (T3) levels accurately reflect thyroid hormone (TH) action in most tissues, offering a potential clinical biomarker. Monitoring serum T3 may guide hypothyroidism management, excluding non-thyroidal illness syndrome.

Keywords:
NTIST3-signalingTriiodothyroninedeiodinasethyroidthyroid hormone binding proteinsthyroxine

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Area of Science:

  • Endocrinology
  • Biomarker Discovery
  • Thyroid Hormone Action

Background:

  • Tissue-specific biomarkers for thyroid hormone (TH) action are highly sought after.
  • Triiodothyronine (T3), the active TH form, varies in tissue content due to binding proteins.
  • Intracellular free T3 levels determine TH signaling, with plasma and tissue T3 in equilibrium.

Purpose of the Study:

  • To evaluate serum T3 levels as a predictor of tissue T3 content and TH action.
  • To determine the clinical applicability of serum T3 measurements in various thyroid states.

Main Methods:

  • Analysis of animal models and human data.
  • Tracer kinetic studies to assess T3 distribution and signaling.
  • Comparison of serum T3 with tissue T3 content across different physiological and pathological conditions.

Main Results:

  • Serum T3 levels accurately predict tissue T3 content and signaling in most tissues, excluding the brain and pituitary.
  • This correlation holds true for euthyroid, hypothyroid, and hyperthyroid individuals.
  • Non-thyroidal illness syndrome disrupts the serum-tissue T3 relationship.

Conclusions:

  • Serum T3 levels can serve as a reliable surrogate for tissue TH action in most organs.
  • Monitoring serum T3 may be a viable strategy for managing hypothyroidism.
  • Future research should correlate clinical outcomes with serum T3 levels in patient cohorts.