Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica
Cold hardiness in the Arctic Collembola Megaphorura arctica (Tullberg), formerly Onychiurus arcticus, has been the subject of extensive studies over the last decade. This species employs an unusual strategy known as cryoprotective dehydration to survive winter temperatures as low as -25 degrees C. T...
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2011
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ftuhipublicatio:oai:pure.atira.dk:publications/df6b2f29-c891-487f-a51d-b58258b704e5 2024-01-28T10:02:19+01:00 Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica Purac, Jelena Pond, David W. Grubor-Lajsic, Gordana Kojic, Danijela Blagojevic, Dusko P. Worland, Michael Roger Clark, Melody S. 2011-06-01 https://pure.uhi.ac.uk/en/publications/df6b2f29-c891-487f-a51d-b58258b704e5 https://doi.org/10.1111/j.1365-3032.2010.00772.x eng eng info:eu-repo/semantics/restrictedAccess Purac , J , Pond , D W , Grubor-Lajsic , G , Kojic , D , Blagojevic , D P , Worland , M R & Clark , M S 2011 , ' Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica ' , Physiological Entomology , vol. 36 , no. 2 , pp. 135-140 . https://doi.org/10.1111/j.1365-3032.2010.00772.x article 2011 ftuhipublicatio https://doi.org/10.1111/j.1365-3032.2010.00772.x 2024-01-04T23:20:42Z Cold hardiness in the Arctic Collembola Megaphorura arctica (Tullberg), formerly Onychiurus arcticus, has been the subject of extensive studies over the last decade. This species employs an unusual strategy known as cryoprotective dehydration to survive winter temperatures as low as -25 degrees C. To expand knowledge of cryoprotective dehydration in M. arctica, the present study investigates how a reduction in ambient temperature affects the fatty acid composition of the total body lipid content along with polar (mainly membrane phospholipids) and nonpolar (mainly triacylglycerols) lipids. Most ectothermic animals compensate for changes in fluidity by regulating fatty acid composition, a process often described as homeoviscous adaptation. In M. arctica, changes in the fatty acid composition of total body lipid content during cold treatment are only moderate, with no clear pattern emerging. However, the levels of unsaturated fatty acids in the polar lipids increase with cold exposure, largely attributable to 16 : 1(n - 7), 18 : 1(n - 9), 18 : 3(n - 6) and 18 : 3(n - 3), whereas unsaturated fatty acid levels in the nonpolar lipids correspondingly decrease. These results suggest a reallocation of fatty acids between the two lipid pools as a response to a temperature reduction of 6 degrees C. Because of hypometabolism, a characteristic of cold adaptation, such a mechanism could be less energy demanding than de novo synthesis of fatty acids and may comprise part of an adaptive homeostatic response. Article in Journal/Newspaper Arctic Arctic University of the Highlands and Islands: Research Database of UHI Arctic Physiological Entomology 36 2 135 140 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
description |
Cold hardiness in the Arctic Collembola Megaphorura arctica (Tullberg), formerly Onychiurus arcticus, has been the subject of extensive studies over the last decade. This species employs an unusual strategy known as cryoprotective dehydration to survive winter temperatures as low as -25 degrees C. To expand knowledge of cryoprotective dehydration in M. arctica, the present study investigates how a reduction in ambient temperature affects the fatty acid composition of the total body lipid content along with polar (mainly membrane phospholipids) and nonpolar (mainly triacylglycerols) lipids. Most ectothermic animals compensate for changes in fluidity by regulating fatty acid composition, a process often described as homeoviscous adaptation. In M. arctica, changes in the fatty acid composition of total body lipid content during cold treatment are only moderate, with no clear pattern emerging. However, the levels of unsaturated fatty acids in the polar lipids increase with cold exposure, largely attributable to 16 : 1(n - 7), 18 : 1(n - 9), 18 : 3(n - 6) and 18 : 3(n - 3), whereas unsaturated fatty acid levels in the nonpolar lipids correspondingly decrease. These results suggest a reallocation of fatty acids between the two lipid pools as a response to a temperature reduction of 6 degrees C. Because of hypometabolism, a characteristic of cold adaptation, such a mechanism could be less energy demanding than de novo synthesis of fatty acids and may comprise part of an adaptive homeostatic response. |
format |
Article in Journal/Newspaper |
author |
Purac, Jelena Pond, David W. Grubor-Lajsic, Gordana Kojic, Danijela Blagojevic, Dusko P. Worland, Michael Roger Clark, Melody S. |
spellingShingle |
Purac, Jelena Pond, David W. Grubor-Lajsic, Gordana Kojic, Danijela Blagojevic, Dusko P. Worland, Michael Roger Clark, Melody S. Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica |
author_facet |
Purac, Jelena Pond, David W. Grubor-Lajsic, Gordana Kojic, Danijela Blagojevic, Dusko P. Worland, Michael Roger Clark, Melody S. |
author_sort |
Purac, Jelena |
title |
Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica |
title_short |
Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica |
title_full |
Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica |
title_fullStr |
Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica |
title_full_unstemmed |
Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica |
title_sort |
cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the arctic collembollan megaphorura arctica |
publishDate |
2011 |
url |
https://pure.uhi.ac.uk/en/publications/df6b2f29-c891-487f-a51d-b58258b704e5 https://doi.org/10.1111/j.1365-3032.2010.00772.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_source |
Purac , J , Pond , D W , Grubor-Lajsic , G , Kojic , D , Blagojevic , D P , Worland , M R & Clark , M S 2011 , ' Cold hardening induces transfer of fatty acids between polar and nonpolar lipid pools in the Arctic collembollan Megaphorura arctica ' , Physiological Entomology , vol. 36 , no. 2 , pp. 135-140 . https://doi.org/10.1111/j.1365-3032.2010.00772.x |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/j.1365-3032.2010.00772.x |
container_title |
Physiological Entomology |
container_volume |
36 |
container_issue |
2 |
container_start_page |
135 |
op_container_end_page |
140 |
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1789327746444296192 |