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Related Concept Videos

Functions of Thyroid Hormones01:18

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.
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...
Testosterone: Functions and Regulation01:26

Testosterone: Functions and Regulation

The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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 iodine is then...
Gonadal and Placental Hormones01:24

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...
The Thyroid Gland01:23

The Thyroid Gland

The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
Testes: Histology01:27

Testes: Histology

A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
The spermatogenic cells, responsible for producing sperm, are...

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Related Experiment Video

Updated: Jul 2, 2026

An Ex vivo Culture System to Study Thyroid Development
08:33

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

The role of thyroid hormone in testicular development and function.

Márcia Santos Wagner1, Simone Magagnin Wajner, Ana Luiza Maia

  • 1Endocrine Division, Thyroid Section, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, 90035-033, Porto Alegre, RS, Brasil.

The Journal of Endocrinology
|August 30, 2008
PubMed
Summary

Thyroid hormone impacts male reproductive health, influencing testicular development and function. Recent research clarifies its role in steroidogenesis and spermatogenesis, highlighting its direct effects on testicular cells.

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Last Updated: Jul 2, 2026

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Area of Science:

  • Endocrinology
  • Reproductive Biology

Background:

  • Thyroid hormone is vital for growth and metabolism.
  • The testis was historically considered unresponsive to thyroid hormone.
  • Emerging evidence highlights thyroid hormone's crucial role in testicular function.

Purpose of the Study:

  • To review recent advances in understanding thyroid hormone's role in male gonadal function.
  • To elucidate the mechanisms of thyroid hormone action in testicular cells.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of studies investigating thyroid hormone receptors in testicular cells.
  • Examination of data on thyroid hormone's influence on steroidogenesis and spermatogenesis.

Main Results:

  • Thyroid hormone significantly influences testicular development and function.
  • Tri-iodothyronine (T3) is involved in Sertoli cell proliferation and Leydig cell differentiation.
  • Thyroid hormone receptors are present in testicular cells, suggesting direct action.

Conclusions:

  • Thyroid hormone plays a direct and significant role in male reproductive function.
  • Further research is needed to fully understand the mechanisms of thyroid hormone action in the testis.