Thyroid Answers Podcast

Episode 130 Rethinking Hypothyroidism with Dr Anthony Bianco

12 snips
Jun 6, 2023
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INSIGHT

T3 Is The Active Hormone

  • T3 is the biologically active thyroid hormone and T4 has no direct activity at thyroid hormone receptors.
  • The thyroid system is designed primarily to maintain circulating T3, not T4.
INSIGHT

Tissues Customize Thyroid Signaling

  • Most circulating T3 is produced outside the thyroid by tissue deiodinases that convert T4 to T3.
  • Different tissues customize local T3 signaling by varying activating (D2) and inactivating (D3) deiodinases.
INSIGHT

Thyroid's Little T3 Matters

  • A small amount of T3 produced by the thyroid is necessary for normal circulating T3 in people without a thyroid.
  • Giving only T4 often cannot restore both normal TSH and normal serum T3 simultaneously.
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