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Related Experiment Videos

Thyroid function in embryonic and early posthatch chickens and quail.

F M McNabb1

  • 1Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg 24061.

Poultry Science
|July 1, 1989
PubMed
Summary
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Technological advancements have improved our understanding of thyroid gland development and thyroid hormone (TH) regulation. Molecular techniques are further revealing the fundamental biological roles of TH in growth and development.

Area of Science:

  • Endocrinology
  • Developmental Biology
  • Molecular Biology

Background:

  • Technological progress, particularly radioimmunoassays, has enhanced descriptive knowledge of thyroid gland (TG) development and thyroid hormone (TH) dynamics.
  • Immunocytochemical and traditional methods have elucidated the developmental timeline and hormonal patterns within the hypothalamic-pituitary-thyroid axis.
  • Research into pituitary control of the TG is constrained by limitations in measuring avian thyroid-stimulating hormone specificity.

Purpose of the Study:

  • To review current understanding of thyroid gland development and thyroid hormone regulation.
  • To highlight the impact of technological advancements on studying the hypothalamic-pituitary-thyroid axis.
  • To identify areas requiring further investigation, particularly in peripheral TH dynamics and molecular mechanisms.

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Main Methods:

  • Radioimmunoassays and immunocytochemical studies.
  • Gland ablation and hormone replacement techniques.
  • Iodothyronine deiodinase assays and receptor binding assays.
  • Molecular genetic techniques for identifying hormone receptor genes and elucidating TH-induced developmental events.

Main Results:

  • Detailed descriptive information on the timing and pattern of thyroid gland development and circulating thyroid hormone.
  • Elucidation of hormone appearance timing, relative amounts, and maturation patterns of the hypothalamic-pituitary-thyroid axis.
  • Identification of genes for triiodothyronine receptors and characterization of developmental changes in receptor-binding capacities.
  • Insights into molecular mechanisms of TH-induced developmental events, such as malic enzyme synthesis.

Conclusions:

  • Technological advances have significantly improved the understanding of thyroid gland development and thyroid hormone regulation.
  • Molecular techniques are crucial for uncovering the fundamental biological roles of thyroid hormone in growth and development.
  • Further research is needed to fully characterize peripheral TH dynamics and the cellular mechanisms triggered by hormone-receptor binding.