Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season
et al. Thyroid hormones (THs) are essential for metabolism and thermoregulation in arctic animals. Still, there is a lack of deeper basic knowledge regarding the regulation and functioning of THs in the environmental physiology of polar bears (Ursus maritimus). This is necessary in order to understa...
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Online Access: | http://hdl.handle.net/10261/125124 https://doi.org/10.1007/s00300-015-1694-z https://doi.org/10.13039/501100003329 https://doi.org/10.13039/100012818 |
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ftcsic:oai:digital.csic.es:10261/125124 2024-02-11T10:01:10+01:00 Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season Møller Gabrielsen, Kristin Obregón, María Jesús Munro Jenssen, Bjørn Ministerio de Economía y Competitividad (España) Comunidad de Madrid Norwegian University of Science and Technology Danish Cooperation for Environment in the Arctic 2015 http://hdl.handle.net/10261/125124 https://doi.org/10.1007/s00300-015-1694-z https://doi.org/10.13039/501100003329 https://doi.org/10.13039/100012818 unknown Springer #PLACEHOLDER_PARENT_METADATA_VALUE# S2010/BMD-2423/MOIR Sí doi:10.1007/s00300-015-1694-z issn: 0722-4060 e-issn: 1432-2056 Polar Biology 38(8): 1285-1296 (2015) http://hdl.handle.net/10261/125124 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100012818 none artículo http://purl.org/coar/resource_type/c_6501 2015 ftcsic https://doi.org/10.1007/s00300-015-1694-z10.13039/50110000332910.13039/100012818 2024-01-16T10:11:59Z et al. Thyroid hormones (THs) are essential for metabolism and thermoregulation in arctic animals. Still, there is a lack of deeper basic knowledge regarding the regulation and functioning of THs in the environmental physiology of polar bears (Ursus maritimus). This is necessary in order to understand the true impact and consequences of the combination of stressors such as depletion of sea ice and endocrine-disrupting contaminants for the polar bear species. As a first step to gain insight into TH physiology in polar bears, TH concentrations in liver, kidney and muscle in East Greenland polar bears sampled February–March 2011 were analysed and their associations with circulating levels of THs were investigated. In addition, type 1 deiodinase (D1) activities in liver, kidney and muscle and type 2 deiodinase (D2) activities in muscle were analysed. Concentrations of 3,5,3′,5′-tetraiodothyronine (T4) were highest in plasma, followed by liver, kidney and muscle, whereas concentrations of 3,5,3′-triiodothyronine (T3) were highest in kidney followed by liver, plasma and muscle. D1 activities in the tissues varied in the order liver > kidney ≫ muscle, while D2 activity was only analysed in muscle. There were significant positive relationships between T4 in plasma and liver as well as between T4 in plasma and D1 activity in liver. This implies that liver is an important non-thyroidal organ for deiodination of T4, thus providing T3 to the plasma pool, in polar bears. The polar bears with the lowest body condition also had the lowest concentrations of free T3 in plasma and D2 activities in muscle. The field work for this study was funded by the Danish Cooperation for Environment in the Arctic (DANCEA). The analyses of thyroid hormones and deiodinase activities in tissues were supported by research Grants SAF2012-32491 from MINECO and S2010/BMD-2423 from CAM, Spain. The study was funded by the Norwegian University of Science and Technology (NTNU). Peer Reviewed Article in Journal/Newspaper Arctic East Greenland Greenland polar bear Polar Biology Sea ice Ursus maritimus Digital.CSIC (Spanish National Research Council) Arctic Greenland Polar Biology 38 8 1285 1296 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
et al. Thyroid hormones (THs) are essential for metabolism and thermoregulation in arctic animals. Still, there is a lack of deeper basic knowledge regarding the regulation and functioning of THs in the environmental physiology of polar bears (Ursus maritimus). This is necessary in order to understand the true impact and consequences of the combination of stressors such as depletion of sea ice and endocrine-disrupting contaminants for the polar bear species. As a first step to gain insight into TH physiology in polar bears, TH concentrations in liver, kidney and muscle in East Greenland polar bears sampled February–March 2011 were analysed and their associations with circulating levels of THs were investigated. In addition, type 1 deiodinase (D1) activities in liver, kidney and muscle and type 2 deiodinase (D2) activities in muscle were analysed. Concentrations of 3,5,3′,5′-tetraiodothyronine (T4) were highest in plasma, followed by liver, kidney and muscle, whereas concentrations of 3,5,3′-triiodothyronine (T3) were highest in kidney followed by liver, plasma and muscle. D1 activities in the tissues varied in the order liver > kidney ≫ muscle, while D2 activity was only analysed in muscle. There were significant positive relationships between T4 in plasma and liver as well as between T4 in plasma and D1 activity in liver. This implies that liver is an important non-thyroidal organ for deiodination of T4, thus providing T3 to the plasma pool, in polar bears. The polar bears with the lowest body condition also had the lowest concentrations of free T3 in plasma and D2 activities in muscle. The field work for this study was funded by the Danish Cooperation for Environment in the Arctic (DANCEA). The analyses of thyroid hormones and deiodinase activities in tissues were supported by research Grants SAF2012-32491 from MINECO and S2010/BMD-2423 from CAM, Spain. The study was funded by the Norwegian University of Science and Technology (NTNU). Peer Reviewed |
author2 |
Ministerio de Economía y Competitividad (España) Comunidad de Madrid Norwegian University of Science and Technology Danish Cooperation for Environment in the Arctic |
format |
Article in Journal/Newspaper |
author |
Møller Gabrielsen, Kristin Obregón, María Jesús Munro Jenssen, Bjørn |
spellingShingle |
Møller Gabrielsen, Kristin Obregón, María Jesús Munro Jenssen, Bjørn Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season |
author_facet |
Møller Gabrielsen, Kristin Obregón, María Jesús Munro Jenssen, Bjørn |
author_sort |
Møller Gabrielsen, Kristin |
title |
Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season |
title_short |
Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season |
title_full |
Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season |
title_fullStr |
Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season |
title_full_unstemmed |
Thyroid hormones and deiodinase activities in plasma and tissues from East Greenland polar bears (Ursus maritimus) during winter season |
title_sort |
thyroid hormones and deiodinase activities in plasma and tissues from east greenland polar bears (ursus maritimus) during winter season |
publisher |
Springer |
publishDate |
2015 |
url |
http://hdl.handle.net/10261/125124 https://doi.org/10.1007/s00300-015-1694-z https://doi.org/10.13039/501100003329 https://doi.org/10.13039/100012818 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic East Greenland Greenland polar bear Polar Biology Sea ice Ursus maritimus |
genre_facet |
Arctic East Greenland Greenland polar bear Polar Biology Sea ice Ursus maritimus |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# S2010/BMD-2423/MOIR Sí doi:10.1007/s00300-015-1694-z issn: 0722-4060 e-issn: 1432-2056 Polar Biology 38(8): 1285-1296 (2015) http://hdl.handle.net/10261/125124 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100012818 |
op_rights |
none |
op_doi |
https://doi.org/10.1007/s00300-015-1694-z10.13039/50110000332910.13039/100012818 |
container_title |
Polar Biology |
container_volume |
38 |
container_issue |
8 |
container_start_page |
1285 |
op_container_end_page |
1296 |
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1790596922555236352 |