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Chronic high-fat diet-induced obesity decreased survival and increased hypertrophy of rats with experimental eccentric hypertrophy from chronic aortic regurgitation.
Dhahri, Wahiba; Drolet, Marie-Claude; Roussel, Elise; Couet, Jacques; Arsenault, Marie.
Affiliation
  • Couet J; Groupe de Recherche en Valvulopathies, Centre de Recherche, Institut universitaire de cardiologie et de pneumologie de Québec, 2725, Chemin Sainte-Foy, Quebec City, Quebec G1V 4G5, Canada. jacques.couet@med.ulaval.ca.
BMC Cardiovasc Disord ; 14: 123, 2014 Sep 24.
Article in En | MEDLINE | ID: mdl-25249193
ABSTRACT

BACKGROUND:

The composition of a diet can influence myocardial metabolism and development of left ventricular hypertrophy (LVH). The impact of a high-fat diet in chronic left ventricular volume overload (VO) causing eccentric LVH is unknown. This study examined the effects of chronic ingestion of a high-fat diet in rats with chronic VO caused by severe aortic valve regurgitation (AR) on LVH, function and on myocardial energetics and survival.

METHODS:

Male Wistar rats were divided in four groups Shams on control or high-fat (HF) diet (15 rats/group) and AR rats fed with the same diets (ARC (n = 56) and ARHF (n = 32)). HF diet was started one week before AR induction and the protocol was stopped 30 weeks later.

RESULTS:

As expected, AR caused significant LV dilation and hypertrophy and this was exacerbated in the ARHF group. Moreover, survival in the ARHF group was significantly decreased compared the ARC group. Although the sham animals on HF also developed significant obesity compared to those on control diet, this was not associated with heart hypertrophy. The HF diet in AR rats partially countered the expected shift in myocardial energy substrate preference usually observed in heart hypertrophy (from fatty acids towards glucose). Systolic function was decreased in AR rats but HF diet had no impact on this parameter. The response to HF diet of different fatty acid oxidation markers as well as the increase in glucose transporter-4 translocation to the plasma membrane compared to ARC was blunted in AR animals compared to those on control diet.

CONCLUSIONS:

HF diet for 30 weeks decreased survival of AR rats and worsened eccentric hypertrophy without affecting systolic function. The expected adaptation of myocardial energetics to volume-overload left ventricle hypertrophy in AR animals seemed to be impaired by the high-fat diet suggesting less metabolic flexibility.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Aortic Valve Insufficiency / Hypertrophy, Left Ventricular / Diet, High-Fat / Obesity Type of study: Diagnostic_studies / Etiology_studies / Prognostic_studies / Risk_factors_studies Limits: Animals Language: En Journal: BMC Cardiovasc Disord Journal subject: ANGIOLOGIA / CARDIOLOGIA Year: 2014 Document type: Article

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Aortic Valve Insufficiency / Hypertrophy, Left Ventricular / Diet, High-Fat / Obesity Type of study: Diagnostic_studies / Etiology_studies / Prognostic_studies / Risk_factors_studies Limits: Animals Language: En Journal: BMC Cardiovasc Disord Journal subject: ANGIOLOGIA / CARDIOLOGIA Year: 2014 Document type: Article