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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.
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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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Author Spotlight: Accurately Assessing Thyroid Hormone-Driven Motor Alterations in Mouse
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Dual function model revised by thyroid hormone receptor alpha knockout frogs.

Daniel R Buchholz1, Yun-Bo Shi2

  • 1Department of Biological Sciences, University of Cincinnati, Cincinnati, OH, USA.

General and Comparative Endocrinology
|April 25, 2018
PubMed
Summary
This summary is machine-generated.

Thyroid hormone receptors (TRs) repress genes before development, but TRα knockout frogs show precocious limb development and delayed intestinal remodeling. This challenges the dual function model of TRs.

Keywords:
Gene knockoutMetamorphosisTadpoleXenopus tropicalis

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Area of Science:

  • Developmental Biology
  • Molecular Endocrinology
  • Genetics

Background:

  • Thyroid hormone (TH) is essential for vertebrate growth and development.
  • Nuclear receptors TRα and TRβ mediate TH's effects on gene expression.
  • A dual function model proposes TRs act as repressors in the absence of TH and activators in its presence.

Purpose of the Study:

  • To investigate the role of TRα in early development using gene knockout technology.
  • To test the repression activity of TRs in vivo as predicted by the dual function model.
  • To understand the specific roles of TRα in limb and intestinal development.

Main Methods:

  • Generation and analysis of TRα knockout frogs.
  • Assessment of gene expression related to metamorphosis.
  • Observation of limb morphogenesis and intestinal remodeling.
  • Analysis of TH signaling pathways.

Main Results:

  • TRα knockout confirmed active repression of metamorphic genes by TRα in the absence of TH.
  • TRα knockout led to precocious initiation of limb morphogenesis.
  • Limb development was retarded in TRα knockout animals during rising TH levels.
  • Intestinal remodeling was delayed in TRα knockout animals.
  • Hind limb development in TRα knockout frogs did not require gene induction by TH signaling, contradicting the dual function model.

Conclusions:

  • TRα plays a critical role in repressing developmental genes prior to TH signaling.
  • The dual function model requires revision, as TRα knockout reveals complex, organ-specific roles in development.
  • Further studies with double knockout frogs are needed for complete model evaluation.