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Open Access Research

ω-3 Polyunsaturated fatty acids prevent pressure overload-induced ventricular dilation and decrease in mitochondrial enzymes despite no change in adiponectin

Karen M O'Shea1, David J Chess1, Ramzi J Khairallah1, Peter A Hecker1, Biao Lei1, Kenneth Walsh2, Christine Des Rosiers3 and William C Stanley1*

Author Affiliations

1 Division of Cardiology and Department of Medicine, University of Maryland, Baltimore, MD, USA

2 Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, USA

3 Department of Nutrition and Montreal Heart Institute, Université de Montréal, Montreal, Canada

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Lipids in Health and Disease 2010, 9:95  doi:10.1186/1476-511X-9-95

Published: 6 September 2010

Abstract

Background

Pathological left ventricular (LV) hypertrophy frequently progresses to dilated heart failure with suppressed mitochondrial oxidative capacity. Dietary marine ω-3 polyunsaturated fatty acids (ω-3 PUFA) up-regulate adiponectin and prevent LV dilation in rats subjected to pressure overload. This study 1) assessed the effects of ω-3 PUFA on LV dilation and down-regulation of mitochondrial enzymes in response to pressure overload; and 2) evaluated the role of adiponectin in mediating the effects of ω-3 PUFA in heart.

Methods

Wild type (WT) and adiponectin-/- mice underwent transverse aortic constriction (TAC) and were fed standard chow ± ω-3 PUFA for 6 weeks. At 6 weeks, echocardiography was performed to assess LV function, mice were terminated, and mitochondrial enzyme activities were evaluated.

Results

TAC induced similar pathological LV hypertrophy compared to sham mice in both strains on both diets. In WT mice TAC increased LV systolic and diastolic volumes and reduced mitochondrial enzyme activities, which were attenuated by ω-3 PUFA without increasing adiponectin. In contrast, adiponectin-/- mice displayed no increase in LV end diastolic and systolic volumes or decrease in mitochondrial enzymes with TAC, and did not respond to ω-3 PUFA.

Conclusion

These findings suggest ω-3 PUFA attenuates cardiac pathology in response to pressure overload independent of an elevation in adiponectin.