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Clin Nutr. 2014 Apr;33(2):260-6. doi: 10.1016/j.clnu.2013.04.009. Epub 2013 Apr 24.

Lipid content in hepatic and gonadal adipose tissue parallel aortic cholesterol accumulation in mice fed diets with different omega-6 PUFA to EPA plus DHA ratios.

Author information

1
Department of Nutrition, Texas Tech University, Lubbock, TX 79409, USA. Electronic address: shu.wang@ttu.edu.
2
JM USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA 02111, USA.
3
Department of Nutrition, Texas Tech University, Lubbock, TX 79409, USA.
4
Garrison Institute on Aging, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.
5
Department of Pathology, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.

Abstract

BACKGROUND & AIMS:

Diets with low omega (ω)-6 polyunsaturated fatty acids (PUFA) to eicosapentaenoic acid (EPA) plus docosahexaenoic acid (DHA) ratios have been shown to decrease aortic cholesterol accumulation and have been suggested to promote weight loss. The involvement of the liver and gonadal adipose tissue (GAT) in mediating these effects is not well understood. LDL receptor null mice were used to assess the effect of an atherogenic diet with different ω-6:EPA+DHA ratios on weight gain, hepatic and GAT lipid accumulation, and their relationship to atherosclerosis.

METHODS:

Four groups of mice were fed a high saturated fat and cholesterol diet (HSF ω-6) alone, or with ω-6 PUFA to EPA+DHA ratios up to 1:1 for 32 weeks. Liver and GAT were collected for lipid and gene expression analysis.

RESULTS:

The fatty acid profile of liver and GAT reflected the diets. All diets resulted in similar weight gains. Compared to HSF ω-6 diet, the 1:1 ratio diet resulted in lower hepatic total cholesterol (TC) content. Aortic TC was positively correlated with hepatic and GAT TC and triglyceride. These differences were accompanied by significantly lower expression of CD36, ATP-transporter cassette A1, scavenger receptor B class 1, 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR), acetyl-CoA carboxylase alpha, acyl-CoA synthetase long-chain family member 5, and stearoyl-coenzyme A desaturase 1 (SCD1) in GAT, and HMGCR, SCD1 and cytochrome P450 7A1 in liver.

CONCLUSIONS:

Dietary ω-6:EPA+DHA ratios did not affect body weight, but lower ω-6:EPA+DHA ratio diets decreased liver lipid accumulation, which possibly contributed to the lower aortic cholesterol accumulation.

KEYWORDS:

Atherosclerosis; Fatty acids; Gonadal adipose tissue; Lipid metabolism; Liver; Omega-3 fatty acids

PMID:
23672804
PMCID:
PMC4005276
DOI:
10.1016/j.clnu.2013.04.009
[Indexed for MEDLINE]
Free PMC Article
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