Cited by 146Thyroid Disorders and TreatmentsHypothalamic control of reproductive hormonesGrowth Hormone and Insulin-like Growth Factors

Neuroanatomical Pathways for Thyroid Hormone Feedback in the Human Hypothalamus

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Alkemade, Anneke, Friesema, Edith C., Unmehopa, Unga A., Fabriek, Babs O., Kuiper, George G., Leonard, Jack L., Wiersinga, Wilmar M., Swaab, Dick F. +2 more·2005·The Journal of Clinical Endocrinology & Metabolism

Abstract

CONTEXT: Recent findings point to an increasing number of hypothalamic proteins involved in the central regulation of thyroid hormone feedback. The functional neuroanatomy of these proteins in the human hypothalamus is largely unknown at present. OBJECTIVE: The aim of this study was to report the distribution of type II and type III deiodinase (D2 and D3) as well as the recently identified T(3) transporter, monocarboxylate transporter 8 (MCT8), in the human hypothalamus. DESIGN: The study included enzyme activity assays, immunocytochemical studies, and mRNA in situ hybridizations in postmortem human hypothalamus (n = 9). RESULTS: D2 immunoreactivity is prominent in glial cells of the infundibular nucleus/median eminence, blood vessels, and cells lining the third ventricle. By contrast, both D3 and MCT8 are expressed by neurons of the paraventricular (PVN), supraoptic, and infundibular nucleus (IFN). In support of these immunocytochemical data, D2 and D3 enzyme activities are detectable in the mediobasal human hypothalamus. Combined D2, D3, MCT8, and thyroid hormone receptor immunohistochemistry and TRH mRNA in situ hybridization clearly showed that D3, MCT8, and thyroid hormone receptor isoforms are all expressed in TRH neurons of the PVN, whereas D2 is not. CONCLUSIONS AND IMPLICATIONS: Based on these findings, we propose three possible routes for thyroid hormone feedback on TRH neurons in the human PVN: 1) local thyroid hormone uptake from the vascular compartment within the PVN, 2) thyroid hormone uptake from the cerebrospinal fluid in the third ventricle followed by transport to TRH neurons in the PVN or IFN neurons projecting to TRH neurons in the PVN, and 3) thyroid hormone sensing in the IFN of the mediobasal hypothalamus by neurons projecting to TRH neurons in the PVN.

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Crossref · 10.1210/jc.2004-2567

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  • In the hypothalamus, DIO2 is expressed in glial cells and tanycytes and DIO3 is expressed in neurons of the paraventricular nucleus (PVN), supraoptic nucleus (SON) and IFN.

    “In the hypothalamus, DIO2 is expressed in glial cells and tanycytes and DIO3 is expressed in neurons of the paraventricular nucleus (PVN), supraoptic nucleus (SON) and IFN [14].”

    From An update on non-thyroidal illness syndrome (2021) · cites this paper as [14]

  • High glucocorticoid levels suppress the pituitary response to TRH in man, and glucocorticoid treatment is associated with downregulation of TR neurons in the human PVN.

    “Hypothalamic TRH is also modulated by glucocorticoids, as high glucocorticoid levels suppress the pituitary response to TRH in man [69], while a postmortem study in human hypothalamus showed that glucocorticoid treatment is associated with downregulation of TR neurons in the human PVN [14].”

    From An update on non-thyroidal illness syndrome (2021) · cites this paper as [14]

    Citation [14] is attached to the claim about glucocorticoid treatment and neurons in the human PVN, not the preceding claim about pituitary response. The Discussion reports low TRH mRNA expression in the PVN of a patient with hyperthyroidism, but our copy does not link that finding to glucocorticoid treatment. Searches for glucocorticoids, cortisol, corticosteroids, and treatment-related downregulation found no passage addressing the attributed association; page numbers were unavailable. (LLM, conf=0.76)

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  • Tanycytes express the thyroid hormone transporters MCT8 and OATP1C1.

    “In addition, tanycytes are richly replete in the thyroid hormone transporters, MCT8 and OATP1C1 (Figure 7, C and D) (51,101,102), that facilitate the entry of T 4 from the circulation or CSF and the release of the generated T 3 into the neuropil or CSF.”
  • Tanycytes are strategically positioned to extract T4 from the bloodstream or CSF because of their location at blood-brain and CSF-brain barriers and their high expression of thyroid hormone transporters.

    “The location of tanycytes at the blood-brain and CSFbrain barriers and their high expression of thyroid hormone transporters place them in a strategic position to extract T 4 from the bloodstream or CSF.”

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Research works printed but not linked: 1

  1. Wiersinga WM 2000 Nonthyroidal illness. In: Braverman LE, Utiger RD, eds. Werner and Ingbar's the thyroid. 8th ed. Philadelphia: Lippincott Williams, Wilkins; 281-295

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Authors
Alkemade, A., Friesema, E. C., Unmehopa, U. A., Fabriek, B. O., Kuiper, G. G., Leonard, J. L., Wiersinga, W. M., Swaab, D. F., Visser, T. J., & Fliers, E.
Affiliations
  • Amsterdam UMC Location University of Amsterdam (NL)
  • Erasmus MC (NL)
  • University of Massachusetts Chan Medical School (US)
Corresponding author
Fliers, Eric
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2005-07
Volume
90
Issue
7
Pages
4322-4334
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2126000321
Cited by
146
References
50
Citations by year
2026: 4 · 2025: 2 · 2024: 4 · 2023: 7 · 2022: 4 · 2021: 5 · 2020: 6 · 2019: 6 · 2018: 1 · 2017: 7 · 2016: 10 · 2015: 7 · 2014: 7 · 2013: 6 · 2012: 12
FWCI
7.46
Type
journal article
Language
en
Open access
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (publishedVersion)
  • KNAW Research Portal (The Royal Netherlands Academy of Arts and Sciences) (publishedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
  • RePub (Erasmus University Rotterdam) (submittedVersion, other-oa)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Growth Hormone and Insulin-like Growth Factors
Keywords
thyroid hormone feedback, hypothalamus, type 2 deiodinase, type III deiodinase, MCT8, thyroid hormone transporters, paraventricular nucleus, arcuate nucleus, median eminence, thyroid hormone receptor, mediobasal hypothalamus, postmortem brain
MeSH terms
Adult, Aged, Aged, 80 and over, Feedback, Female, Humans, Hypothalamus, Immunohistochemistry, Iodide Peroxidase, Male, Middle Aged, Pituitary Gland, Anterior, Receptors, Thyroid Hormone, Thyroid Hormones, In Situ Hybridization, Monocarboxylic Acid Transporters, Symporters

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