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Synthesis and Regulation of Thyroid Hormones

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...

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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The Thyroid Gland

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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.
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Infertility in Females

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Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
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Related Experiment Video

Updated: Dec 31, 2025

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

Published on: February 9, 2024

Thyroid and Fertility: Recent Advances.

Chrysoula Dosiou¹

¹Division of Endocrinology, Stanford University School of Medicine, Stanford, California.

Thyroid : Official Journal of the American Thyroid Association

|January 7, 2020

Summary

This summary is machine-generated.

Thyroid disease impacts women

Keywords:

fertility hypothyroidism radioactive iodine thyroid thyroid autoimmunity

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Area of Science:

Reproductive Endocrinology
Thyroidology

Background:

Thyroid disease is common in women of reproductive age.
Thyroid dysfunction is linked to infertility.
Recent guidelines were published in 2017.

Purpose of the Study:

Review recent advances in thyroid disease and fertility.
Update understanding since 2017 guidelines.

Main Methods:

Literature review of recent studies.
Analysis of randomized controlled trials and cohort studies.

Main Results:

Thyrotropin (TSH) elevation and thyroid autoimmunity are linked to infertility and low ovarian reserve.
Treatment benefits for TSH >4 mIU/L confirmed in retrospective study.
No benefit of thyroid hormone shown in euthyroid women with autoimmunity in RCTs.
Radioactive iodine (RAI) may have gonadal toxicity.

Conclusions:

Thyroid hormone plays a role in reproductive tissue regulation.
Levothyroxine treatment benefits require further research for specific patient groups.
Impact of RAI on fertility needs more investigation.