Abstract
Purpose
To examine the effect of different dietary fat types on osteopontin (OPN) expressions and inflammation of adipose tissues in diet-induced obese rats.
Methods
Male Sprague–Dawley rats were randomly assigned to one control group fed standard diet (LF, n = 10) and two high-fat diet groups fed isoenergy diet rich in lard or soybean oil (HL or HS, n = 45 each). Diet-induced obese rats in HL and HS group were then subdivided into two groups either continuously fed high-fat diet or switched to low-fat diet for 8 more weeks. Fasting serum glucose, insulin, and OPN concentrations were assayed and QUICKI was calculated; the expression of OPN, IL-6, IL-10, TNF-α, NF-κB, and F4/80 in adipose tissue was determined.
Results
Both high-fat diets lead to comparable development of obesity characterized by insulin resistance and adipose tissue inflammation. Obese rats continuously fed high-fat diet rich in lard oil exhibited the highest fasting serum insulin level and adipose tissue OPN, F4/80, TNF-α, and NF-κB expression level. In both high-fat diet groups, switching to low-fat diet resulted in less intra-abdominal fat mass, decreased expression of F4/80, TNF-α, and NF-κB, while decreased OPN expression was only observed in lard oil fed rats after switching to low-fat diet.
Conclusions
Reducing diet fat or replacing lard oil with soybean oil in high-fat diet alleviates obesity-related inflammation and insulin resistance by attenuating the upregulation of OPN and macrophage infiltration into adipose tissue induced by high-fat diet.
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Abbreviations
- GAPDH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- HL:
-
High-fat diet rich in lard
- HS:
-
High-fat diet rich in soybean oil
- LF:
-
Low-fat standard chow
- MUFA:
-
Monounsaturated fatty acid
- NF-κB:
-
Nuclear factor kappa B
- OPN:
-
Osteopontin
- PPARγ:
-
Peroxisome proliferator-activated receptor gamma
- PUFA:
-
Polyunsaturated fatty acids
- QUICKI:
-
Quantitative insulin sensitivity check index
- TNF-α:
-
Tumor necrosis factor-α
- IL-6:
-
Interleukin-6
- IL-10:
-
Interleukin-10
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Acknowledgments
This work was supported by National Natural Science Foundation of China (No. 30671765) and Scientific Research Foundation for Returned overseas Chinese Scholars, Ministry of Education of China (No. 20101561).
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The authors have declared no conflict of interest.
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Wang, X., Cheng, M., Zhao, M. et al. Differential effects of high-fat-diet rich in lard oil or soybean oil on osteopontin expression and inflammation of adipose tissue in diet-induced obese rats. Eur J Nutr 52, 1181–1189 (2013). https://doi.org/10.1007/s00394-012-0428-z
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DOI: https://doi.org/10.1007/s00394-012-0428-z