| Differences in membrane acyl phospholipid composition between an endothermic mammal and an ectothermic reptile are not limited to any phospholipid class. | |
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MedLine Citation:
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PMID: 17872998 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study examined questions concerning differences in the acyl composition of membrane phospholipids that have been linked to the faster rates of metabolic processes in endotherms versus ectotherms. In liver, kidney, heart and brain of the ectothermic reptile, Trachydosaurus rugosus, and the endothermic mammal, Rattus norvegicus, previous findings of fewer unsaturates but a greater unsaturation index (UI) in membranes of the mammal versus those of the reptile were confirmed. Moreover, the study showed that the distribution of phospholipid head-group classes was similar in the same tissues of the reptile and mammal and that the differences in acyl composition were present in all phospholipid classes analysed, suggesting a role for the physical over the chemical properties of membranes in determining the faster rates of metabolic processes in endotherms. The most common phosphatidylcholine (PC) molecules present in all tissues (except brain) of the reptile were 16:0/18:1, 16:0/18:2, 18:0/18:2, 18:1/18:1 and 18:1/18:2, whereas arachidonic acid (20:4), containing PCs 16:0/20:4, 18:0/20:4, were the common molecules in the mammal. The most abundant phosphatidylethanolamines (PE) used in the tissue of the reptile were 18:0/18:2, 18:0/20:4, 18:1/18:1, 18:1/18:2 and 18:1/20:4, compared to 16:0/18:2, 16:0/20:4, 16:0/22:6, 18:0/20:4, 18:0/22:6 and 18:1/20:4 in the mammal. UI differences were primarily due to arachidonic acid found in both PC and PEs, whereas docosahexaenoic acid (22:6) was a lesser contributor mainly within PEs and essentially absent in the kidney. The phospholipid composition of brain was more similar in the reptile and mammal compared to those of other tissues. |
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Authors:
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Todd W Mitchell; Kim Ekroos; Stephen J Blanksby; Anthony J Hulbert; Paul L Else |
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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 Oct |
Date Detail:
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Created Date: 2007-09-17 Completed Date: 2007-12-12 Revised Date: - |
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: 3440-50 Citation Subset: IM |
Affiliation:
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Metabolic Research Centre, University of Wollongong, NSW, 2522, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Temperature Regulation / physiology* Brain / cytology Cell Membrane / metabolism* Female Kidney / cytology Liver / cytology Lizards / metabolism* Male Myocardium / cytology Phospholipids / classification, metabolism* Rats |
| Chemical | |
Reg. No./Substance:
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0/Phospholipids |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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