| Oleate-enriched diet improves insulin sensitivity and restores muscle protein synthesis in old rats. | |
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MedLine Citation:
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PMID: 21700370 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BACKGROUND & AIMS: Age-related inflammation and insulin resistance (IR) have been implicated in the inability of old muscles to properly respond to anabolic stimuli such as amino acids (AA) or insulin. Since fatty acids can modulate inflammation and IR in muscle cells, we investigated the effect of palmitate-enriched diet and oleate-enriched diet on inflammation, IR and muscle protein synthesis (MPS) rate in old rats. METHODS: Twenty-four 25-month-old rats were fed either a control diet (OC), an oleate-enriched diet (HFO) or a palmitate-enriched diet (HFP) for 16 weeks. MPS using labeled amino acids and mTOR activation were assessed after AA and insulin anabolic stimulation to mimic postprandial state. RESULTS: IR and systemic and adipose tissue inflammation (TNFα and IL1β) were improved in the HFO group. Muscle genes controlling mitochondrial β-oxidation (PPARs, MCAD and CPT-1b) were up-regulated in the HFO group. AA and insulin-stimulated MPS in the HFO group only, and this stimulation was related to activation of the Akt/mTOR pathway. CONCLUSIONS: The age-related MPS response to anabolic signals was improved in rats fed an oleate-enriched diet. This effect was related to activation of muscle oxidative pathways, lower IR, and a decrease in inflammation. |
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Authors:
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Nicolas Tardif; Jérôme Salles; Jean-François Landrier; Isabelle Mothe-Satney; Christelle Guillet; Carole Boue-Vaysse; Lydie Combaret; Christophe Giraudet; Véronique Patrac; Justine Bertrand-Michel; Carole Migné; Jean-Michel Chardigny; Yves Boirie; Stéphane Walrand |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-21 |
Journal Detail:
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Title: Clinical nutrition (Edinburgh, Scotland) Volume: - ISSN: 1532-1983 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8309603 Medline TA: Clin Nutr Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Ltd and European Society for Clinical Nutrition and Metabolism. All rights reserved. |
Affiliation:
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INRA, UMR 1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand Cedex 1, France. |
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