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Published in: European Journal of Nutrition 2/2014

Open Access 01-03-2014 | Original Contribution

Dietary walnut oil modulates liver steatosis in the obese Zucker rat

Authors: Anja Fink, Corinna E. Rüfer, Julie Le Grandois, Alexander Roth, Dalal Aoude-Werner, Eric Marchioni, Achim Bub, Stephan W. Barth

Published in: European Journal of Nutrition | Issue 2/2014

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Abstract

Purpose

Non-alcoholic fatty liver disease (NAFLD) is the hepatic manifestation of the metabolic syndrome. We aimed to clarify the impact of dietary walnut oil versus animal fat on hepatic steatosis, representing the initial step of multistage pathogenesis of NAFLD, in Zucker obese rats.

Methods

Zucker lean ad libitum (a.l.), Zucker obese a.l. or Zucker obese pair fed (p.f.) to the lean received isocaloric diets containing 8 % walnut oil (W8), W14 or 14 % lard (L14) (n = 10/group). Body weight, clinical serology, liver weight, lipid content and fatty acid composition and hepatic lipid metabolism-related transcripts were evaluated.

Results

Compared to lean, Zucker obese a.l. and p.f. showed hepatic triacylglyceride (TAG) accumulation. In Zucker obese p.f., W14 compared to W8 and L14 reduced liver lipids, TAG as well as hepatic omega-6 (n-6)/n-3 ratio and SCD activity index [(C18:0 + C18:1)/C18:0 ratio] paralleled by decreased lipoprotein lipase mRNA in obese p.f. and elevated microsomal triglyceride transfer protein mRNA in lean and obese. Further, W14 elevated the fasting blood TAG and reduced cholesterol levels in obese.

Conclusions

In our model, consumption of W14 inhibited hepatic lipid accumulation along with modulated hepatic gene expression implicated in hepatic fatty acid influx or lipoprotein assembly. These results provide first indication that dietary lipids from walnut oil are modulators of hepatic steatosis as the initial step of progressive NAFLD pathogenesis.
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Metadata
Title
Dietary walnut oil modulates liver steatosis in the obese Zucker rat
Authors
Anja Fink
Corinna E. Rüfer
Julie Le Grandois
Alexander Roth
Dalal Aoude-Werner
Eric Marchioni
Achim Bub
Stephan W. Barth
Publication date
01-03-2014
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nutrition / Issue 2/2014
Print ISSN: 1436-6207
Electronic ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-013-0573-z

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