Metabolic responses to high-fat diets rich in n-3 or n-6 long-chain polyunsaturated fatty acids in mice selected for either high body weight or leanness explain different health outcomes
| Autor: | Hannes Bergmann, Martina Langhammer, Karin Nuernberg, Dirk Dannenberger, Ulla Renne, Korinna Huber, Bernhard H. Breier, Falk Schneider, Gerd Nuernberg, Nichola M. Thompson, Shakeela N Jayasinghe |
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| Rok vydání: | 2011 |
| Předmět: |
medicine.medical_specialty
mice medicine.medical_treatment Endocrinology Diabetes and Metabolism selection line Dietary lipid Adipose tissue Medicine (miscellaneous) lcsh:TX341-641 metabolic response Internal medicine medicine lcsh:RC620-627 chemistry.chemical_classification Nutrition and Dietetics biology business.industry Leptin Insulin Research high fat diet Fatty acid medicine.disease Obesity lcsh:Nutritional diseases. Deficiency diseases Insulin receptor Endocrinology chemistry Biochemistry biology.protein business lcsh:Nutrition. Foods and food supply Polyunsaturated fatty acid polyunsaturated fatty acids |
| Zdroj: | Nutrition & Metabolism Nutrition & Metabolism, Vol 8, Iss 1, p 56 (2011) |
| ISSN: | 1743-7075 |
| Popis: | Background Increasing evidence suggests that diets high in polyunsaturated fatty acids (PUFA) confer health benefits by improving insulin sensitivity and lipid metabolism in liver, muscle and adipose tissue. Methods The present study investigates metabolic responses in two different lines of mice either selected for high body weight (DU6) leading to rapid obesity development, or selected for high treadmill performance (DUhTP) leading to a lean phenotype. At 29 days of age the mice were fed standard chow (7.2% fat, 25.7% protein), or a high-fat diet rich in n-3 PUFA (n-3 HFD, 27.7% fat, 19% protein) or a high-fat diet rich in n-6 PUFA (n-6 HFD, 27.7% fat, 18.6% protein) for 8 weeks. The aim of the study was to determine the effect of these PUFA-rich high-fat diets on the fatty acid profile and on the protein expression of key components of insulin signalling pathways. Results Plasma concentrations of leptin and insulin were higher in DU6 in comparison with DUhTP mice. The high-fat diets stimulated a strong increase in leptin levels and body fat only in DU6 mice. Muscle and liver fatty acid composition were clearly changed by dietary lipid composition. In both lines of mice n-3 HFD feeding significantly reduced the hepatic insulin receptor β protein concentration which may explain decreased insulin action in liver. In contrast, protein kinase C ζ expression increased strongly in abdominal fat of n-3 HFD fed DUhTP mice, indicating enhanced insulin sensitivity in adipose tissue. Conclusions A diet high in n-3 PUFA may facilitate a shift from fuel deposition in liver to fuel storage as fat in adipose tissue in mice. Tissue specific changes in insulin sensitivity may describe, at least in part, the health improving properties of dietary n-3 PUFA. However, important genotype-diet interactions may explain why such diets have little effect in some population groups. |
| Databáze: | OpenAIRE |
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