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Related Concept Videos

Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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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.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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Synthesis and Regulation of Thyroid Hormones01:20

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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
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Types of Hormones02:13

Types of Hormones

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Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.
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Types of Hormones01:21

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Hormones are classified into four main groups: steroids, eicosanoids, amino acid-based derivatives, and peptide hormones.
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Plant Hormones01:56

Plant Hormones

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Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.
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Hormonal Regulation01:33

Hormonal Regulation

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The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
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Related Experiment Video

Updated: Jan 25, 2026

Author Spotlight: Accurately Assessing Thyroid Hormone-Driven Motor Alterations in Mouse
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Rediscovering the Axolotl as a Model for Thyroid Hormone Dependent Development.

Anne Crowner1, Shivam Khatri1, Dana Blichmann1

  • 1Department of Neuroscience, Spinal Cord and Brain Injury Research Center, and Ambystoma Genetic Stock Center, University of Kentucky, Lexington, KY, United States.

Frontiers in Endocrinology
|April 30, 2019
PubMed
Summary

The Mexican axolotl (Ambystoma mexicanum) retains juvenile traits into adulthood, a phenomenon called paedomorphosis. Understanding its unique hypothyroid state offers new insights into development and evolution.

Keywords:
ambystomaaxolotlmetamorphosispaedomorphosisthyroid hormone

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Regenerative Medicine

Background:

  • The Mexican axolotl (Ambystoma mexicanum) is a key model organism in biomedical research.
  • Axolotls exhibit neoteny, retaining juvenile features into adulthood, unlike their metamorphosing relatives.
  • This paedomorphic trait allows for a fully aquatic life cycle and has evolutionary significance.

Purpose of the Study:

  • To explore the axolotl's paedomorphic development and its implications.
  • To advocate for research beyond endocrinology to understand the axolotl's hypothyroid state.
  • To leverage the axolotl genome for new insights into development and evolution.

Main Methods:

  • Review of existing literature on axolotl biology and paedomorphosis.
  • Discussion of the axolotl's unique hypothyroid state.
  • Consideration of genomic and gene manipulation approaches.

Main Results:

  • Axolotl paedomorphosis is a critical adaptation for its aquatic lifestyle and domestication.
  • Current endocrinological approaches are insufficient to fully explain the axolotl's developmental trajectory.
  • The axolotl genome provides a powerful resource for studying paedomorphosis.

Conclusions:

  • Further research is needed to understand the genetic and molecular underpinnings of axolotl paedomorphosis.
  • The axolotl serves as a unique model for studying thyroid hormone's role in development and evolution.
  • Investigating the axolotl's hypothyroid state can reveal novel biological mechanisms.