Physiol. Genomics AJP: Cell Physiology
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Physiol. Genomics (November 27, 2007). doi:10.1152/physiolgenomics.00219.2007
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Submitted on September 18, 2007
Accepted on November 22, 2007

Short-term high fat-feeding results in morphological and metabolic adaptations in the skeletal muscle of C57BL/6J mice

Janneke de Wilde1*, Ronny Mohren1, Sjoerd van den Berg2, Mark Boekschoten3, Ko Willems-Van Dijk2, Philip De Groot3, Michael Muller3, Edwin C.M. Mariman4, and Egbert Smit4

1 Human Biology, Maastricht University, Maastricht, Netherlands; Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, Netherlands
2 Department of Endocrinology and Department of Human Genetics, Leiden University Medical Center, Leiden, Netherlands
3 Nutrition, Metabolism and Genomics group, Wageningen University, Wageningen, Netherlands
4 Human Biology, Maastricht University, Maastricht, Netherlands; , Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, Maastricht, Netherlands

* To whom correspondence should be addressed. E-mail: j.dewilde{at}hb.unimaas.nl.

The prevalence of the metabolic syndrome (MS) is rapidly increasing all over the world. Consequently, there is an urgent need for more effective intervention strategies. Both animal and human studies indicate that lipid oversupply to skeletal muscle can result in insulin resistance which is one of the characteristics of the MS. C57BL/6J mice were fed a low fat (10 kcal%) palm oil diet or a high fat (45 kcal%; HF) palm oil diet for 3 or 28 days. By combining transcriptomics with protein and lipid analyses we aimed to better understand the molecular events underlying the early onset of the MS. Short-term HF-feeding led to altered expression levels of genes involved in a variety of biological processes including morphogenesis, energy metabolism, lipogenesis and immune function. Protein analysis showed increased levels of the myosin heavy chain, slow fiber type protein and the complexes I, II, III, IV and V of the oxidative phosphorylation. Furthermore, we observed that the main mitochondrial membrane phospholipids, phosphatidylcholine and phosphatidylethanolamine, contained more saturated fatty acids. Altogether, these results point to a morphological as well as a metabolic adaptation by promoting a more oxidative fiber type. We hypothesize that after this early positive adaptation, a continued transcriptional down-regulation of genes involved in oxidative phosphorylation will result in decreased oxidative capacity at a later stage. Together with increased saturation of phospholipids of the mitochondrial membrane this can result in decreased mitochondrial function which is a hallmark observed in insulin resistance and type 2 diabetes.







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