Cited by 100Adipose Tissue and MetabolismThyroid Disorders and TreatmentsPeroxisome Proliferator-Activated Receptors

Full Expression of Uncoupling Protein Gene Requires the Concurrence of Norepinephrine and Triiodothyronine

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Silva, J. Enrique, Matthews, Peggy S.·1988·Molecular Endocrinology

Abstract

We have examined the uncoupling (UCP) protein gene expression in euthyroid and hypothyroid rats. UCP mRNA levels were estimated by northern blot analysis of total RNA from brown adipose tissue (BAT). Stimuli were endogenous (cold) and exogenous norepinephrine (NE), isoproterenol, T3, and T4. While in euthyroid rats UCP mRNA levels increase 2- to 3-fold by 2 h after NE or overnight cold exposure, these stimuli and isoproterenol are ineffective in hypothyroid rats. One single dose of T4, equal to the daily production rate, brings about a normal response in hypothyroid rats exposed to cold overnight. Hypothyroid rats recover their responsiveness to NE approximately 4 h after a receptor saturating dose of T3. On the other hand, such a dose of T3 induces a 3- to 4-fold increase in UCP mRNA levels in hypothyroid rats without the need of exogenous NE, and this response is not reduced by raising ambient temperature to thermoneutrality (28 C). However, the following evidence indicates that T3 requires adrenergic input to stimulate the accumulation of UCP mRNA: first, euthyroid animals maintained at 28 C do not respond to such a treatment. Second, when T3 was injected to hypothyroid rats with unilaterally denervated BAT, only the intact side responded to T3 with an elevation of the UCP mRNA levels, but both sides remained responsive to T3 + NE. We conclude that: 1) the failure of UCP mRNA to increase in response to cold is due to an intrinsic defect in BAT to respond to NE; 2) T3 cannot induce gene in the absence of adrenergic input; and 3) the full expression of UCP gene requires both adrenergic- and T3-dependent signals. In addition, the data are consistent with reports indicating an elevated sympathetic tone on BAT in hypothyroidism and, further, suggest that thermal stress is not the only cause for the enhanced sympathetic activity in this condition.

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Authors
Silva, J. E., & Matthews, P. S.
Affiliations
Brigham and Women's Hospital (US)
Venue
Molecular Endocrinology
Published
1988-08
Volume
2
Issue
8
Pages
706-713
ISSN
  • 0888-8809 (ISSN-L)
  • 1944-9917
OpenAlex
W2032557664
Cited by
100
References
31
Citations by year
2024: 1 · 2022: 4 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 3 · 2014: 1 · 2013: 3
FWCI
4.88
Type
journal article
Language
en
Open access
Locations
  • Molecular Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
Keywords
uncoupling proteins, norepinephrine, triiodothyronine, hypothyroidism, brown adipose tissue, cold exposure, sympathetic nervous system, adrenergic signaling, thyroid hormones, isoproterenol, thermoneutrality, denervation
MeSH terms
Uncoupling Protein 1, Animals, Adipose Tissue, Brown, Carrier Proteins, Gene Expression Regulation, Genes, Ion Channels, Isoproterenol, Male, Membrane Proteins, Mitochondria, Norepinephrine, Rats, Inbred Strains, Reference Values, RNA, Messenger, Thyroid Gland, Thyroidectomy, Thyroxine, Transcription, Genetic, Triiodothyronine, Mitochondrial Proteins, Rats

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