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Linoleic acid-rich fats reduce atherosclerosis development beyond its oxidative and inflammatory stress-increasing effect in apolipoprotein E-deficient mice in comparison with saturated fatty acid-rich fats

Published online by Cambridge University Press:  08 March 2007

Masao Sato ,
Kenichi Shibata ,
Run Nomura ,
Daisuke Kawamoto ,
Rika Nagamine  and
Katsumi Imaizumi
Masao Sato
Affiliation:
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8581, Japan
Kenichi Shibata
Affiliation:
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8581, Japan
Run Nomura
Affiliation:
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8581, Japan
Daisuke Kawamoto
Affiliation:
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8581, Japan
Rika Nagamine
Affiliation:
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8581, Japan
Katsumi Imaizumi*
Affiliation:
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka 812-8581, Japan
*
*Corresponding author: Dr Katsumi Imaizumi, fax +81 92 642 3003, email [email protected]
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Abstract

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The relative benefit of replacing saturated fatty acid with linoleic acids is still being debated because a linoleic acid-enriched diet increases oxidative and inflammatory stresses, although it is associated with a reduction in serum cholesterol levels. The present study was conducted to evaluate the effect of dietary supplementation of linoleic acid-rich (HL) fat, compared with a saturated fatty acid-rich (SF) fat on atherosclerotic lesion areas, serum and liver cholesterol levels, oxidative stress (urinary isoprostanes and serum malondialdehayde) and inflammatory stress (expression of aortic monocyte chemoattractant protein-1; MCP-1) in apo E-deficient mice. Male and female apo E-deficient mice (8 weeks old; seven to eight per group) were fed an AIN-76-based diet containing SF fat (50 g palm oil and 50 g lard/kg) or HL fat (100 g high-linoleic safflower-seed oil/kg) for 9 weeks. Compared with the SF diet, the HL diet lowered atherosclerosis (P<0·05). It reduced serum total cholesterol levels (P<0·05), increased HDL-cholesterol levels (P<0·05) and lowered liver esterified cholesterol levels (P<0·01). The HL diet-fed mice showed increased expression of MCP-1 mRNA (P<0·05), serum levels of malondialdehayde (P<0·05) and urinary excretion of 2,3-dinor-5,6-dihydro-8-iso-prostaglandin F2α; P<0·05). These results suggest that having biomarkers in vivo for oxidative stress and inflammatory status of endothelial cells does not necessarily indicate predisposition to an increased lesion area in the aortic root in apo E-deficient mice fed an HL or SF diet.

Keywords

Apolipoprotein E-deficient miceLinoleic acidMonocyte chemoattractant protein-1Saturated fatty acids
Type
Research Article
Information
British Journal of Nutrition , Volume 94 , Issue 6 , December 2005 , pp. 896 - 901
Copyright
Copyright © The Nutrition Society 2005

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