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Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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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.
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...
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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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Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
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Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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Goiter01:27

Goiter

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Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...
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Hypothyroidism II: Pathophysiology01:23

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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Reverse triiodothyronine does not alter pituitary-thyroid function in normal subjects.

B L Shulkin, R D Utiger

    The Journal of Clinical Endocrinology and Metabolism
    |June 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Elevated reverse triiodothyronine (rT3) in nonthyroid illness does not alter thyroid function in healthy individuals. Oral administration of rT3 showed no significant impact on thyroid hormone levels or pituitary response.

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    Area of Science:

    • Endocrinology
    • Thyroid Hormone Metabolism
    • Pituitary-Thyroid Axis Regulation

    Background:

    • Elevated serum reverse triiodothyronine (rT3) is common in nonthyroidal illness.
    • rT3's in vitro inhibition of extrathyroidal T3 production suggests a potential role in altered thyroid function.
    • The precise impact of elevated rT3 on the hypothalamic-pituitary-thyroid axis in vivo remains unclear.

    Purpose of the Study:

    • To investigate the in vivo effect of oral reverse triiodothyronine (rT3) administration on the hypothalamic-pituitary-thyroid axis in normal subjects.
    • To determine if elevated serum rT3 concentrations per se contribute to thyroid function abnormalities.

    Main Methods:

    • Ten healthy subjects received 3 mg of oral rT3 daily for 4 days.
    • Serum concentrations of rT3, thyroxine (T4), triiodothyronine (T3), and thyroid-stimulating hormone (TSH) were measured.
    • Basal and thyrotropin-releasing hormone (TRH)-stimulated TSH levels were assessed.
    • Serum T3 and T4 binding were also evaluated.

    Main Results:

    • Oral rT3 administration significantly increased serum rT3 concentrations (at least 10-fold) within one day.
    • No significant changes were observed in mean serum T4, T3, or TSH concentrations (basal or TRH-stimulated).
    • Serum binding of T3 and T4 remained unchanged throughout the study.

    Conclusions:

    • Oral administration of reverse triiodothyronine (rT3) demonstrated no detectable biological activity in normal subjects.
    • Elevations in serum rT3 concentrations alone do not appear to cause abnormalities in thyroid function or the hypothalamic-pituitary-thyroid axis.
    • The findings suggest that elevated rT3 in nonthyroidal illness may not be the primary driver of observed thyroid function alterations.