Abstract
Purpose
To study the effect of isoenergetic administration to adult rats of high-fat or high-fat–high-fructose diet for 2 weeks on skeletal muscle mitochondrial energetic.
Methods
Body and skeletal muscle composition, energy balance, plasma lipid profile and glucose tolerance were measured, together with mitochondrial functionality, oxidative stress and antioxidant defense.
Results
Rats fed high-fat–high-fructose diet exhibited significantly higher plasma triglycerides and non-esterified fatty acids, together with significantly higher plasma glucose and insulin response to glucose load. Skeletal muscle triglycerides and ceramide were significantly higher in rats fed high-fat–high-fructose diet. Skeletal muscle mitochondrial energetic efficiency and uncoupling protein 3 content were significantly higher, while adenine nucleotide translocase content was significantly lower, in rats fed high-fat or high-fat–high-fructose diet.
Conclusions
The results suggest that a high-fat–high-fructose diet even without hyperphagia is able to increase lipid flow to skeletal muscle and mitochondrial energetic efficiency, with two detrimental effects: (a) energy sparing that contributes to the early onset of obesity and (b) reduced oxidation of fatty acids and lipid accumulation in skeletal muscle, which could generate insulin resistance.


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Acknowledgments
This work was supported by a grant from University “Federico II” of Naples and by P.O.R. Campania FSE 2007-2013, Project CREME. The authors thank Dr. Emilia De Santis for skilful management of animal house.
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The authors declare no conflicts of interest.
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Crescenzo, R., Bianco, F., Coppola, P. et al. The effect of high-fat–high-fructose diet on skeletal muscle mitochondrial energetics in adult rats. Eur J Nutr 54, 183–192 (2015). https://doi.org/10.1007/s00394-014-0699-7
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DOI: https://doi.org/10.1007/s00394-014-0699-7


