Uncoupling protein1 mRNA, mitochondrial GTP-binding, and T4 5'-deiodinase of brown adipose tissue in euthermic Daurian ground squirrel during cold exposure

Regulation of thermogenic activity and uncoupling protein1 (UCP1) expression in brown adipose tissue (BAT) were studied in euthermic Daurian ground squirrel after acute and chronic cold exposure at 4 degrees C. The UCP1 concentration was indirectly determined by titration with its specific ligand [3...

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Veröffentlicht in:Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Molecular & integrative physiology, 2001-04, Vol.128 (4), p.827-835
Hauptverfasser: Liu, X, Li, Q, Lin, Q, Sun, R
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container_title Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
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Li, Q
Lin, Q
Sun, R
description Regulation of thermogenic activity and uncoupling protein1 (UCP1) expression in brown adipose tissue (BAT) were studied in euthermic Daurian ground squirrel after acute and chronic cold exposure at 4 degrees C. The UCP1 concentration was indirectly determined by titration with its specific ligand [3H]-labeled GTP, and Ucp1 mRNA was detected by using a [32P]-labeled antisense oligonucleotide probe. Both acute and chronic cold exposure stimulated up-regulation of Ucp1 mRNA. Although UCP1 concentration is not significantly increased after 24 h of cold exposure, it is markedly elevated by 75% in squirrels after 4-week cold adaptation compared with controls raised at 22 degrees C. Changes in T4 5'-deiodinase activity were closely associated with variations of Ucp1 mRNA level. Ucp1 gene expression is significantly affected by cold exposure in BAT from euthermic Daurian ground squirrels. In addition, the activation of T4 5'-deiodinase may be an important regulatory factor in cold-induced Ucp1 expression.
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subjects Adaptation, Physiological
Adipose Tissue, Brown - physiology
Animals
Body Temperature Regulation
Body Weight
Carrier Proteins - genetics
Carrier Proteins - metabolism
Cold Temperature
Female
Guanosine Triphosphate - metabolism
Hibernation
Iodide Peroxidase - metabolism
Ion Channels
Male
Membrane Proteins - genetics
Membrane Proteins - metabolism
Mitochondria - metabolism
Mitochondrial Proteins
Sciuridae - physiology
Uncoupling Protein 1
title Uncoupling protein1 mRNA, mitochondrial GTP-binding, and T4 5'-deiodinase of brown adipose tissue in euthermic Daurian ground squirrel during cold exposure
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