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Hypothalamic thyrotropin-releasing hormone mRNA responses to hypothyroxinemia induced by sleep deprivation. Am J Physiol Endocrinol Metab 2002 Jul;283(1):E85-93

Date

06/18/2002

Pubmed ID

12067847

DOI

10.1152/ajpendo.00558.2001

Scopus ID

2-s2.0-0036298089   24 Citations

Abstract

Sleep deprivation in rats results in progressive declines in circulating concentrations of both total and free thyroxine (T(4)) and triiodothyronine (T(3)) without an expected increase in plasma thyroid-stimulating hormone (TSH). Administration of thyrotropin-releasing hormone (TRH) results in appropriate increases in plasma TSH, free T(4), and free T(3) across experimental days, suggesting deficient endogenous TRH production and/or release. This study examined transcriptional responses related to TRH regulation following sleep deprivation. In situ hybridization was used to detect and quantitate expression of mRNAs encoding prepro-TRH and 5'-deiodinase type II (5'-DII) in brain sections of six rats sleep deprived for 16-21 days, when there was marked hypothyroxinemia, and in sections from animals yoked to the experimental protocol as well as from sham controls. TRH transcript levels in the paraventricular nucleus (PVN) were essentially unchanged at 15-16 days but increased to about threefold control levels in three of four rats sleep deprived for 20-21 days, a change comparable to that typically found in prolonged experimental hypothyroidism. There was no evidence for suppression of 5'-DII mRNA levels, which would be a sign of T(3) feedback downregulation of neurons in the PVN. A failure to increase serum TSH in response to hypothyroxinemia and to increased prepro-TRH mRNA expression indicates that alterations in posttranscriptional stages of TRH synthesis, processing, or release likely mediate the central hypothyroidism induced by sleep deprivation.

Author List

Everson CA, Nowak TS Jr

Author

Carol A. Everson PhD Professor in the Medicine department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Arcuate Nucleus of Hypothalamus
Hypothalamus
In Situ Hybridization
Iodide Peroxidase
Male
Median Eminence
Paraventricular Hypothalamic Nucleus
Protein Precursors
RNA, Messenger
Rats
Rats, Sprague-Dawley
Sleep Deprivation
Thyroidectomy
Thyrotropin-Releasing Hormone
Thyroxine
Triiodothyronine
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