Thyroid hormone

Why the growth plate needs it, what childhood thyrotoxicosis does to final height, and why the selective thyroid drugs are built to avoid bone.

Thyroid hormone: the thyroid releases T4, which becomes the active T3. Bone and cartilage respond through the TRα receptor and the liver through TRβ, the one the selective drugs target. T4T3Growth plate: TRαLiver: TRβselective drugsThyroidT4 to T3

Thyroxine (T4) and triiodothyronine (T3), from the thyroid gland. Permissive for growth plate function rather than driving it: required for chondrocyte maturation and for the GH/IGF-1 axis to operate. Above sufficiency it speeds growth and skeletal maturation together, without raising final height SDS.

In this article

  • Deficiency in childhood
  • Excess thyroid hormone
  • The receptor the selective drugs avoid
  • Compounds
  • Summary

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Educational content, not medical advice. Nothing here is a recommendation to take or stop taking anything — talk to a doctor about your own situation.