| Trans-10, cis-12 conjugated linoleic acid decreases de novo lipid synthesis in human adipocytes. | |
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MedLine Citation:
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PMID: 21775116 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Conjugated linoleic acid (CLA) reduces adiposity in vivo. However, mechanisms mediating these changes are unclear. Therefore, we treated cultures of human adipocytes with trans-10, cis-12 (10,12) CLA, cis-9, trans-11 (9,11) CLA or other trans fatty acids (FA), and measured indices of lipid metabolism. The lipid-lowering effects of 10,12 CLA were unique, as other trans FA did not reduce TG content to the same extent. Using low levels of [(14)C]-CLA isomers, it was shown that both isomers were readily incorporated into acylglycerols and phospholipids, albeit at lower levels than [(14)C]-oleic or [(14)C]-linoleic acids. When using [(14)C]-acetic acid and [(14)C]-pyruvic acid as substrates, 30 μM 10,12 CLA, but not 9,11 CLA, decreased de novo synthesis of triglyceride, free FA, diacylglycerol, cholesterol esters, cardiolipin, phospholipids and ceramides within 3-24 h. Treatment with 30 μM 10,12 CLA, but not 9,11 CLA, decreased total cellular lipids within 3 days and the ratio of monounsaturated FA (MUFA) to saturated FA, and increased C18:0 acyl-CoA levels within 24 h. Consistent with these data, stearoyl-CoA desaturase (SCD)-1 mRNA and protein levels were down-regulated by 10,12 CLA within 7-12 h, respectively. The mRNA levels of liver X receptor (LXR)α and sterol regulatory element binding protein (SREBP)-1c, transcription factors that regulate SCD-1, were decreased by 10,12 CLA within 5 h. These data suggest that the isomer-specific decrease in de novo lipid synthesis by 10,12 CLA is due, in part, to the rapid repression of lipogenic transcription factors that regulate MUFA synthesis, suggesting an anti-obesity mechanism unique to this trans FA. |
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Authors:
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Thomas Obsen; Nils J Faergeman; Soonkyu Chung; Kristina Martinez; Semone Gobern; Olivier Loreau; Martin Wabitsch; Susanne Mandrup; Michael McIntosh |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-18 |
Journal Detail:
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Title: The Journal of nutritional biochemistry Volume: - ISSN: 1873-4847 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9010081 Medline TA: J Nutr Biochem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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