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Functions of Thyroid Hormones

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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The Thyroid Gland

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Synthesis and Functions of Calcitonin

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Related Experiment Video

Updated: Dec 20, 2025

An Ex vivo Culture System to Study Thyroid Development

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

The many faces of thyroxine.

Mary B Dratman¹, Joseph V Martin²

¹Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

AIMS Neuroscience

|May 27, 2020

Summary

Thyroid hormones like triiodothyronine (T3) have gene-independent actions not mediated by nuclear receptors. Catecholamine analogs and iodothyronamines may explain these diverse T3 functions.

Keywords:

deiodinases iodothyronines non-canonical nongenomic thyronamines

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Area of Science:

Endocrinology
Neuroscience
Molecular Biology

Background:

Triiodothyronine (T3) primarily acts via nuclear receptors regulating gene expression.
Recent studies show T3 retains functions even when this nuclear pathway is blocked.
Previous hypotheses suggested gene-independent mechanisms for T3 action.

Purpose of the Study:

To explore the mechanisms behind T3's gene-independent effects.
To propose a model involving catecholamine analogs and iodothyronamines for T3 actions.
To review progress in understanding these alternative pathways since 1974.

Main Methods:

Review of existing literature and historical hypotheses (Dratman, 1974).
Analysis of structural properties of thyroxine and triiodothyronine.
Proposed model integrating catecholamine analogs, iodothyronamines, and deiodinase activity.

Main Results:

Thyroid hormones possess diverse structural features enabling various functions.
Catecholamine analogs and their conversion to iodothyronamines may mimic nuclear receptor functions.
Deiodinase activity and iodine positioning on thyroxine metabolites are key to modulating effects.

Conclusions:

Gene-independent actions of T3 are significant and potentially mediated by non-genomic pathways.
A novel framework suggests catecholamine analogs and iodothyronamines play crucial roles in T3 signaling.
Structural variations and enzymatic modifications (deiodinases) dictate thyroid hormone functional outcomes, impacting vertebrate behavior.