European Journal of Nutrition

, Volume 52, Issue 2, pp 537–545

Increased hepatic de novo lipogenesis and mitochondrial efficiency in a model of obesity induced by diets rich in fructose

Authors

  • Raffaella Crescenzo
    • Department of Structural and Functional BiologyUniversity of Naples
  • Francesca Bianco
    • Department of Structural and Functional BiologyUniversity of Naples
  • Italia Falcone
    • Department of Structural and Functional BiologyUniversity of Naples
  • Paola Coppola
    • Department of Structural and Functional BiologyUniversity of Naples
    • Department of Structural and Functional BiologyUniversity of Naples
  • Susanna Iossa
    • Department of Structural and Functional BiologyUniversity of Naples
Original Contribution

DOI: 10.1007/s00394-012-0356-y

Cite this article as:
Crescenzo, R., Bianco, F., Falcone, I. et al. Eur J Nutr (2013) 52: 537. doi:10.1007/s00394-012-0356-y

Abstract

Purpose

To assess hepatic de novo lipogenesis and mitochondrial energetics as well as whole-body energy homeostasis in sedentary rats fed a fructose-rich diet.

Methods

Male rats of 90 days of age were fed a high-fructose or control diet for 8 weeks. Body composition, energy balance, oxygen consumption, carbon dioxide production, non-protein respiratory quotient, de novo lipogenesis and insulin resistance were measured. Determination of specific activity of hepatic enzymes of de novo lipogenesis, mitochondrial mass, oxidative capacity and degree of coupling, together with parameters of oxidative stress and antioxidant defence, was also carried out.

Results

Body energy and lipid content as well as plasma insulin and non-esterified fatty acids were significantly higher in fructose-fed than in control rats. Significantly higher rates of net de novo lipogenesis and activities of hepatic lipogenic enzymes fatty acid synthase and stearoyl CoA desaturase-1 were found in fructose-fed rats compared to controls. Mitochondrial protein mass and degree of coupling were significantly higher in fructose-fed rats compared to controls. Hepatic mitochondria showed oxidative damage, both in the lipid and in the protein component, together with decreased activity of antioxidant defence.

Conclusion

Liver mitochondrial compartment is highly affected by fructose feeding. The increased mitochondrial efficiency allows liver cells to burn less substrates to produce ATP for de novo lipogenesis and gluconeogenesis. In addition, increased lipogenesis gives rise to whole body and ectopic lipid deposition, and higher mitochondrial coupling causes mitochondrial oxidative stress.

Keywords

Mitochondrial uncouplingInsulin resistanceBody lipidsDe novo lipogenesis

Copyright information

© Springer-Verlag 2012