Cited by 318Thyroid Disorders and TreatmentsDrug Transport and Resistance MechanismsChemical Analysis and Environmental Impact

Tissue-specific thyroid hormone deprivation and excess in monocarboxylate transporter (mct) 8-deficient mice

Dumitrescu, Alexandra M., Liao, Xiao-Hui, Weiss, Roy E., Millen, Kathleen, Refetoff, Samuel·2006·Endocrinology

Abstract

Mutations of the X-linked thyroid hormone (TH) transporter (monocarboxylate transporter, MCT8) produce in humans unusual abnormalities of thyroid function characterized by high serum T3 and low T4 and rT3. The mechanism of these changes remains obscure and raises questions regarding the regulation of intracellular availability and metabolism of TH. To study the pathophysiology of MCT8 deficiency, we generated Mct8 knockout mice. Male mice deficient in Mct8 (Mct8(-/y)) replicate the thyroid abnormalities observed in affected men. TH deprivation and replacement with L-T3 showed that suppression of TSH required higher serum levels T3 in Mct8(-/y) than wild-type (WT) littermates, indicating hypothalamus and/or thyrotroph resistance to T3. Furthermore, T4 is required to maintain the high serum T3 level because the latter was not different between the two genotypes during administration of T3. Mct8(-/y) mice have 2.3-fold higher T3 content in liver associated with 6.1- and 3.1-fold increase in deiodinase 1 mRNA and enzymatic activity, respectively. The relative T3 excess in liver of Mct8(-/y) mice produced a decrease in serum cholesterol (79 +/- 18 vs. 137 +/- 38 mg/dl in WT) and an increase in alkaline phosphatase (107 +/- 23 vs. 58 +/- 3 U/liter in WT) levels. In contrast, T3 content in cerebrum was 1.8-fold lower in Mct8(-/y) mice, associated with a 1.6- and 10.6-fold increase in D2 mRNA and enzymatic activity, respectively, as previously observed in TH-deprived WT mice. We conclude that cell-specific differences in intracellular TH content due to differences in contribution of the various TH transporters are responsible for the unusual clinical presentation of this defect, in contrast to TH deficiency.

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Crossref · 10.1210/en.2006-0390

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Authors
Dumitrescu, A. M., Liao, X.-H., Weiss, R. E., Millen, K., & Refetoff, S.
Affiliations
University of Chicago (US)
Corresponding author
Refetoff, Samuel
Venue
Endocrinology
Published
2006-09-01
Volume
147
Issue
9
Pages
4036-4043
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2102611661
Cited by
318
References
30
Citations by year
2026: 4 · 2025: 7 · 2024: 7 · 2023: 3 · 2022: 19 · 2021: 15 · 2020: 11 · 2019: 20 · 2018: 9 · 2017: 21 · 2016: 18 · 2015: 24 · 2014: 23 · 2013: 19 · 2012: 17
FWCI
13.53
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Chicago
  • National Institutes of Health (DK 15070)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 15070, DK 58281, DK 20595, R01DK058281)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Chemical Analysis and Environmental Impact
Keywords
MCT8, thyroid hormone excess, deiodinase 2, T3, thyroxine, reverse T3, TSH suppression, liver, cerebrum, serum cholesterol, alkaline phosphatase, knockout mice
MeSH terms
Alkaline Phosphatase, Animals, Brain Chemistry, Cholesterol, Disease Models, Animal, Drug Resistance, Female, Humans, Hypothalamus, Kinetics, Liver, Male, Mice, Inbred C57BL, Mutation, Phenotype, Thyroid Hormones, Thyrotropin, Thyroxine, Triiodothyronine, Mice, Knockout, Membrane Transport Proteins, Monocarboxylic Acid Transporters, Symporters, Mice

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