Abstract
Here, we investigate whether a diet rich in fish oil can lead to the development of hepatic alterations associated with non-alcoholic fatty liver disease (NAFLD). To achieve this goal, we provided, for 8 weeks, four different diets to 3-month-old C57BL/6 mice: (a) standard-chow diet (SC; 40 g soybean oil/kg diet, 10 % of the total energy content from lipids), (b) fish oil diet (FO; 4 g soybean oil and 36 g fish oil/kg diet, 10 % of the total energy content from lipids), (c) high-fat diet (HF; 40 g soybean oil and 238 g lard/kg diet, 50 % of the total energy content from lipids), and (d) high-fish oil diet (HFO; 40 g soybean oil and 238 g fish oil/kg diet, 50 % of the total energy content from lipids). Biochemical analyses, stereology, western-blotting and RT-qPCR were used. In the HF group, we found evidence of obesity, metabolic syndrome, and liver damage, along with hypertriglyceridemia, hepatic insulin resistance, and steatosis. On the other hand, the HFO group did not present these alterations and remained similar to the controls. The changes observed in the animals fed the HF diet were accompanied by an increase in hepatic lipogenesis and a decrease in beta-oxidation; meanwhile, in the HFO group, the opposite results were found, that is, reduced lipogenesis and elevated beta-oxidation, were most likely responsible for the prevention of deleterious hepatic alterations and liver damage. In conclusion, a diet rich in fish oil has beneficial effects on hepatic insulin resistance, lipogenesis and beta-oxidation and prevents hepatic tissue from liver damage and NAFLD.
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Abbreviations
- BM:
-
Body mass
- CPT-1:
-
Carnitine palmitoyltransferase-1
- EE:
-
Energy expenditure
- FAS:
-
Fatty acid synthase
- FE:
-
Feed efficiency
- FO:
-
The fish oil group
- GLUT-2:
-
Glucose transporter-2
- HDL-c:
-
High-density lipoprotein-cholesterol
- HF:
-
The high-fat group
- HFO:
-
The high-fish oil group
- HOMA-IR:
-
Homeostasis model assessment of insulin resistance index
- IR:
-
Insulin resistance
- LDL-c:
-
Low-density lipoprotein-cholesterol
- NAFLD:
-
Non-alcoholic fatty liver disease
- OGTT:
-
Oral glucose tolerance test
- PEPCK:
-
Phosphoenolpyruvate carboxykinase
- PPARalpha:
-
Peroxisome proliferator-activated receptor alpha
- PUFA:
-
Polyunsaturated fatty acids
- RQ:
-
Respiratory quotient
- SC:
-
The standard-chow group
- SREBP-1c:
-
Sterol regulatory element binding protein-1c
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Acknowledgments
The authors would like to thank Mrs. Thatiany Marinho and Mrs. Aline Penna for their technical assistance. This work was supported by Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ) and Coordenacao de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES), Brazil.
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Bargut, T.C.L., Frantz, E.D.C., Mandarim-de-Lacerda, C.A. et al. Effects of a Diet Rich in n-3 Polyunsaturated Fatty Acids on Hepatic Lipogenesis and Beta-Oxidation in Mice. Lipids 49, 431–444 (2014). https://doi.org/10.1007/s11745-014-3892-9
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DOI: https://doi.org/10.1007/s11745-014-3892-9