Thyroid Hormones
Thyroid Hormones - Related Videos
01:18
Functions of Thyroid Hormones
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2024
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...
01:20
Synthesis and Regulation of Thyroid Hormones
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2024
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...
03:02
Orthotopic Inoculation of Thyroid Cancer Cells into Murine Thyroid: A Procedure to Establish Orthotopic Thyroid Cancer Mouse Model
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2023
This video describes the procedure for orthotopic inoculation of thyroid cancer cells into the thyroid gland of mouse models, which may then serve as a valuable platform to assess carcinogenesis and discover potential treatment strategies.
02:13
Types of Hormones
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2019
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. Steroid hormones are derived from cholesterol and are lipophilic in nature. This allows them to readily traverse the lipid-rich cell membrane to bind to their intracellular receptors in the cytoplasm or nucleus. Once bound, the cytoplasmic hormone-receptor complex translocates to the nucleus.
04:05
A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function
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Cited by 1 •
2023
Here we present a protocol for a versatile behavior test developed recently, the ladder beam test. This test has the advantage of detecting subtle cerebellar ataxia caused by a defect of thyroid hormone action in the central nervous system over the conventional behavior tests assessing motor performance.
FAQs
Conversion of T4 to T3 determines how much active thyroid hormone becomes available in peripheral tissues. Because T3 is the more active form, this step links hormone production by the gland with the strength of thyroid-hormone action inside cells. Clinically, that distinction supports interpretation of thyroid physiology when evaluating endocrine disease.
Binding of T3 to nuclear receptors provides the intracellular control point for thyroid-hormone signaling. The receptor interaction changes gene transcription, allowing a circulating endocrine signal to produce longer-lasting changes in cellular activity rather than only an immediate response. This mechanism explains how thyroid hormones can influence metabolism, growth, development, and energy use across tissues.
Thyroid hormone physiology depends on more than glandular release because synthesis, transport, peripheral conversion, and metabolism all affect hormone availability and action. Considering these linked stages helps clinicians connect laboratory measurements with biological effects and avoid treating thyroid status as a single process restricted to the thyroid gland.
Measurements of thyroid hormones and regulatory markers help distinguish abnormal thyroid states, including hypothyroidism and hyperthyroidism. Clinicians use the results as part of endocrine evaluation rather than as an isolated description of symptoms. The findings can support diagnosis and help determine whether hormone replacement or another management strategy is appropriate.
Levothyroxine replacement addresses inadequate thyroid hormone production by supplying hormone action when the body does not produce enough. Its clinical role is restorative: treatment aims to re-establish the signaling needed for normal metabolic activity and energy use. Hormone measurements and regulatory markers help assess the adequacy of this approach over time.
Monitoring is important because clinical management depends on both the underlying disorder and the response to replacement therapy. Thyroid hormone measurements and regulatory markers provide objective information for evaluating whether hormone action has been restored adequately. This follow-up supports treatment adjustment and helps maintain an appropriate clinical response during ongoing care.