Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris).
Fasting typically suppresses thyroid hormone (TH)-mediated cellular events and increases sirtuin 1 (SIRT1) activity. THs may regulate metabolism through nongenomic pathways and directly through activation of adenosine monophosphate-activated protein kinase (AMPK). Adult male elephant seals (Mirounga...
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ftcdlib:oai:escholarship.org:ark:/13030/qt5f29j5gz 2023-05-15T16:05:38+02:00 Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). Lee, Debby Martinez, Bridget Crocker, Daniel E Ortiz, Rudy M e13114 2017-02-01 application/pdf https://escholarship.org/uc/item/5f29j5gz unknown eScholarship, University of California qt5f29j5gz https://escholarship.org/uc/item/5f29j5gz public Physiological reports, vol 5, iss 4 Muscle Skeletal Animals Seals Earless Body Weight Adenylate Kinase Fasting Energy Metabolism Phosphorylation Male Sirtuin 1 Deiodinase PGC1α insulin lipid metabolism thyroid hormone PGC1 alpha 1.1 Normal biological development and functioning Physiology Clinical Sciences Medical Physiology article 2017 ftcdlib 2022-07-25T17:30:20Z Fasting typically suppresses thyroid hormone (TH)-mediated cellular events and increases sirtuin 1 (SIRT1) activity. THs may regulate metabolism through nongenomic pathways and directly through activation of adenosine monophosphate-activated protein kinase (AMPK). Adult male elephant seals (Mirounga angustirostris) are active, hypermetabolic, and normothermic during their annual breeding fast, which is characterized by stable TH levels. However, the contribution of TH to maintenance of their fasting metabolism is unknown. To investigate the fasting effects on cellular TH-mediated events and its potential association with SIRT1 and AMPK, we quantified plasma TH levels, mRNA expressions of muscle SIRT1 and TH-associated genes as well as the phosphorylation of AMPK in adult, male northern elephant seals (n=10/fasting period) over 8weeks of fasting (early vs. late). Deiodinase type I (DI1) expression increased twofold with fasting duration suggesting that the potential for TH-mediated cellular signaling is increased. AMPK phosphorylation increased 61±21% with fasting suggesting that cellular metabolism is increased. The mRNA expression of the TH transporter, monocarboxylate transporter 10 (MCT10), increased 2.4-fold and the TH receptor (THrβ-1) decreased 30-fold suggesting that cellular uptake of T4 is increased, but its subsequent cellular effects such as activation of AMPK are likely nongenomic. The up-regulation of SIRT1 mRNA expression (2.6-fold) likely contributes to the nongenomic activation of AMPK by TH, which may be necessary to maintain the expression of PGC-1α These coordinated changes likely contribute to the up-regulation of mitochondrial metabolism to support the energetic demands associated with prolonged fasting in adult seals. Article in Journal/Newspaper Elephant Seals University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Muscle Skeletal Animals Seals Earless Body Weight Adenylate Kinase Fasting Energy Metabolism Phosphorylation Male Sirtuin 1 Deiodinase PGC1α insulin lipid metabolism thyroid hormone PGC1 alpha 1.1 Normal biological development and functioning Physiology Clinical Sciences Medical Physiology |
spellingShingle |
Muscle Skeletal Animals Seals Earless Body Weight Adenylate Kinase Fasting Energy Metabolism Phosphorylation Male Sirtuin 1 Deiodinase PGC1α insulin lipid metabolism thyroid hormone PGC1 alpha 1.1 Normal biological development and functioning Physiology Clinical Sciences Medical Physiology Lee, Debby Martinez, Bridget Crocker, Daniel E Ortiz, Rudy M Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). |
topic_facet |
Muscle Skeletal Animals Seals Earless Body Weight Adenylate Kinase Fasting Energy Metabolism Phosphorylation Male Sirtuin 1 Deiodinase PGC1α insulin lipid metabolism thyroid hormone PGC1 alpha 1.1 Normal biological development and functioning Physiology Clinical Sciences Medical Physiology |
description |
Fasting typically suppresses thyroid hormone (TH)-mediated cellular events and increases sirtuin 1 (SIRT1) activity. THs may regulate metabolism through nongenomic pathways and directly through activation of adenosine monophosphate-activated protein kinase (AMPK). Adult male elephant seals (Mirounga angustirostris) are active, hypermetabolic, and normothermic during their annual breeding fast, which is characterized by stable TH levels. However, the contribution of TH to maintenance of their fasting metabolism is unknown. To investigate the fasting effects on cellular TH-mediated events and its potential association with SIRT1 and AMPK, we quantified plasma TH levels, mRNA expressions of muscle SIRT1 and TH-associated genes as well as the phosphorylation of AMPK in adult, male northern elephant seals (n=10/fasting period) over 8weeks of fasting (early vs. late). Deiodinase type I (DI1) expression increased twofold with fasting duration suggesting that the potential for TH-mediated cellular signaling is increased. AMPK phosphorylation increased 61±21% with fasting suggesting that cellular metabolism is increased. The mRNA expression of the TH transporter, monocarboxylate transporter 10 (MCT10), increased 2.4-fold and the TH receptor (THrβ-1) decreased 30-fold suggesting that cellular uptake of T4 is increased, but its subsequent cellular effects such as activation of AMPK are likely nongenomic. The up-regulation of SIRT1 mRNA expression (2.6-fold) likely contributes to the nongenomic activation of AMPK by TH, which may be necessary to maintain the expression of PGC-1α These coordinated changes likely contribute to the up-regulation of mitochondrial metabolism to support the energetic demands associated with prolonged fasting in adult seals. |
format |
Article in Journal/Newspaper |
author |
Lee, Debby Martinez, Bridget Crocker, Daniel E Ortiz, Rudy M |
author_facet |
Lee, Debby Martinez, Bridget Crocker, Daniel E Ortiz, Rudy M |
author_sort |
Lee, Debby |
title |
Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). |
title_short |
Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). |
title_full |
Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). |
title_fullStr |
Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). |
title_full_unstemmed |
Fasting increases the phosphorylation of AMPK and expression of sirtuin1 in muscle of adult male northern elephant seals (Mirounga angustirostris). |
title_sort |
fasting increases the phosphorylation of ampk and expression of sirtuin1 in muscle of adult male northern elephant seals (mirounga angustirostris). |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
https://escholarship.org/uc/item/5f29j5gz |
op_coverage |
e13114 |
genre |
Elephant Seals |
genre_facet |
Elephant Seals |
op_source |
Physiological reports, vol 5, iss 4 |
op_relation |
qt5f29j5gz https://escholarship.org/uc/item/5f29j5gz |
op_rights |
public |
_version_ |
1766401527546642432 |