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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.
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Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
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Drug-Receptor Interaction: Agonist01:25

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Agonists are drugs that interact with specific receptors in the body to produce a biological response. When an agonist binds to a receptor, it activates or enhances the receptor's function, leading to physiological effects. The interaction between agonist drugs and receptors is crucial for their therapeutic action in various medical treatments.
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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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Related Experiment Video

Updated: Feb 14, 2026

Author Spotlight: Accurately Assessing Thyroid Hormone-Driven Motor Alterations in Mouse
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Transcriptomic and phenotypic profiling in developing zebrafish exposed to thyroid hormone receptor agonists.

Derik E Haggard1, Pamela D Noyes2, Katrina M Waters3

  • 1Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, United States.

Reproductive Toxicology (Elmsford, N.Y.)
|February 20, 2018
PubMed
Summary
This summary is machine-generated.

This study developed an in vivo zebrafish high-throughput screening (HTS) method. It identified a unique signature for thyroid hormone receptor agonists, aiding chemical screening for endocrine disruption.

Keywords:
Endocrine disruptorsHigh-throughputPhenotypic anchoringToxCastTranscriptomicsZebrafish

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Area of Science:

  • Endocrinology
  • Toxicology
  • Developmental Biology

Background:

  • Developing in vivo high-throughput screening (HTS) and computational methods is crucial for assessing chemical interactions with endocrine pathways (estrogen, androgen, thyroid).
  • Existing in vitro HTS assays require complementary in vivo approaches for comprehensive chemical safety evaluations.

Purpose of the Study:

  • To explore the utility of an embryonic zebrafish HTS approach for identifying and classifying endocrine bioactivity.
  • To utilize phenotypically-anchored transcriptome profiling for this purpose.

Main Methods:

  • Zebrafish embryos were exposed to 25 known estrogen-, androgen-, or thyroid-active chemicals.
  • Chemical concentrations were selected to induce adverse malformations or mortality in 80% of exposed animals at 120 hours post-fertilization.
  • Transcriptome analysis focused on the top 1000 significant differentially expressed transcripts.

Main Results:

  • A unique transcriptional and phenotypic signature was identified for thyroid hormone receptor agonists.
  • This signature was determined by analyzing differentially expressed transcripts and developmental toxicity profiles across various chemical exposures.

Conclusions:

  • The identified signature shows potential for a tiered in vivo HTS strategy.
  • This approach may assist in identifying chemicals that interact with the thyroid hormone receptor, contributing to endocrine disruptor screening.