| Relationship between food availability, glycerol and glycogen levels in low-temperature challenged rainbow smelt Osmerus mordax. | |
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MedLine Citation:
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PMID: 17690235 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Rainbow smelt Osmerus modax accumulate glycerol in winter that serves as an antifreeze. Fish were held at 8 degrees C, or subjected to a decrease in water temperature to -1 degrees C over a 19 day period, and subsequently maintained at -1 degrees C from 15 January to 11 May 2004. Starved fish did not survive the challenge of temperature decrease, with death ensuing above the typical freeze point for marine teleosts (-0.8 degrees C). A decrease in temperature activates the glycerol accumulation mechanism at about 5 degrees C with peak plasma levels exceeding 300 micromol ml(-1). Glycerol levels begin to decrease in late February even at water temperatures below -1 degrees C, suggesting either an inherent circannual or photoperiod trigger, possibly in association with sufficiently high levels of antifreeze protein. Glycogen levels in liver did not change significantly in starved fish maintained at 8 degrees C. However, liver glycogen was depleted in fish subjected to the low-temperature challenge and at a faster rate in starved than in fed fish. Stored glycogen in liver and other tissues can account for only a small amount of the total glycerol production, suggesting a strong requirement for food during accelerated glycerol production. Liver glycogen levels increased in April and May in association with the decrease in glycerol. Levels of glycerol in liver, kidney, spleen, gill, intestine, heart, muscle and brain follow the same pattern as that in plasma. During the early part of the glycerol accumulation phase, all tissues except for liver have lower levels of glycerol in the intracellular space than the levels in plasma. In liver, glycerol is in equilibrium between the two compartments. |
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Authors:
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William R Driedzic; Connie E Short |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of experimental biology Volume: 210 ISSN: 0022-0949 ISO Abbreviation: J. Exp. Biol. Publication Date: 2007 Aug |
Date Detail:
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Created Date: 2007-08-10 Completed Date: 2007-11-01 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
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Languages: eng Pagination: 2866-72 Citation Subset: IM |
Affiliation:
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Ocean Sciences Centre, Memorial University of Newfoundland, St John's, Newfoundland, A1C 5S7, Canada. wdriedzic@mun.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological Animals Cold Temperature* Food Deprivation / physiology* Gastrointestinal Tract / chemistry Glycerol / analysis, blood, metabolism* Glycogen / analysis, metabolism* Liver / chemistry Muscle, Skeletal / chemistry Myocardium / chemistry Osmeriformes / physiology* Time Factors |
| Chemical | |
Reg. No./Substance:
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56-81-5/Glycerol; 9005-79-2/Glycogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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