title: Highly purified eicosapentaenoic acid ameliorates cardiac injury and adipose tissue inflammation in a rat model of metabolic syndrome.
abstract: BACKGROUND
  n-3 Polyunsaturated fatty acids such as eicosapentaenoic acid (EPA), which are abundant in fish oil, have been shown to delay the onset of cardiovascular events. We previously established DahlS.Z-Leprfa/Leprfa(DS/obese) rats, which are derived from a cross between Dahl salt-sensitive and Zucker rats, as a model of metabolic syndrome. This study has now explored the influence of highly purified EPA on cardiac and adipose tissue pathophysiology in this animal model.
  
  
  METHODS
  DS/obese rats were administered EPA (300 or 1,000 mg kg-1d-1, per os) or vehicle from age 9 to 13 weeks. Homozygous lean (DahlS.Z-Lepr+/Lepr+, or DS/lean) littermates were studied as controls.
  
  
  RESULTS
  Whereas EPA had no effect on body weight, food intake or systolic blood pressure in DS/obese rats, it attenuated cardiac fibrosis, diastolic dysfunction, oxidative stress and inflammation in these animals. In addition, EPA did not affect insulin resistance but reduced adipocyte hypertrophy and inflammation in visceral fat of DS/obese rats. Moreover, EPA increased circulating levels of adiponectin as well as attenuated both the down-regulation of AMP-activated protein kinase phosphorylation and the up-regulation of phosphorylation of the p65 subunit of nuclear factor-kB in the heart of DS/obese rats.
  
  
  CONCLUSIONS
  Treatment of DS/obese rats with EPA did not affect hypertension but reduced cardiac fibrosis and diastolic dysfunction, with the latter effects being accompanied by AMP-activated protein kinase activation and inactivation of nuclear factor-kB signalling in the heart, possibly as a result of an increase in adiponectin secretion. EPA may be suitable for the treatment of cardiac injury associated with metabolic syndrome.
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ito
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Sano
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nagasawa
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: N
authors.initials: N
authors.lastname: Matsuura
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yamada
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: A
authors.initials: A
authors.lastname: Uchinaka
authors.affiliation: Department of Cardiology Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: T
authors.initials: T
authors.lastname: Murohara
authors.affiliation: Department of Pathophysiological Laboratory Sciences Nagoya University Graduate School of Medicine Nagoya Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nagata
keywords: Adiponectin; eicosapentaenoic acid; inflammation; metabolic syndrome