Document Detail


High-fat diet prevents cardiac hypertrophy and improves contractile function in the hypertensive dahl salt-sensitive rat.
MedLine Citation:
PMID:  16173943     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. The role that dietary lipid and plasma fatty acid concentration play in the development of cardiac hypertrophy in response to hypertension is not clear. 2. In the present study, we treated Dahl salt-sensitive rats with either normal chow (NC), normal chow with salt added (NC + salt) or a diet high in long-chain saturated fatty acids with added salt (HFD + salt). Cardiac function was assessed by echocardiography and left ventricular (LV) catheterization. 3. The HFD + salt group had significantly higher plasma free fatty acid concentrations and myocardial triglyceride content compared with the NC + salt group, but did not upregulate the activity of the fatty acid oxidation enzyme medium chain acyl-coenzyme A dehydrogenase. Systolic blood pressure was elevated to a similar extent in the NC + salt and HFD + salt groups compared with the NC group. Although LV mass was increased in the NC + salt group compared with the NC group, LV mass in the HFD + salt group did not differ from that of the NC group and was significantly lower than that in the NC + salt group. 4. There was no evidence of cardiac dysfunction in the NC + salt group compared with the NC group; however, high fat feeding significantly increased LV contractile performance (e.g. increased cardiac output and peak dP/dt). 5. In conclusion, the HFD + salt diet prevented the hypertrophic response to hypertension and improved the contractile performance of the heart. It remains to be determined whether preventing cardiac hypertrophic adaptations would be deleterious to the heart if the hypertensive stress is maintained long term.
Authors:
Isidore C Okere; David J Chess; Tracy A McElfresh; Janean Johnson; Julie Rennison; Paul Ernsberger; Brian D Hoit; Margaret P Chandler; William C Stanley
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Clinical and experimental pharmacology & physiology     Volume:  32     ISSN:  0305-1870     ISO Abbreviation:  Clin. Exp. Pharmacol. Physiol.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-09-21     Completed Date:  2006-01-05     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0425076     Medline TA:  Clin Exp Pharmacol Physiol     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  825-31     Citation Subset:  IM    
Affiliation:
Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure / drug effects
Body Size / drug effects
Cardiomegaly / pathology,  prevention & control*
Dietary Fats / administration & dosage,  pharmacology*
Electrocardiography
Fatty Acids, Nonesterified / blood
Heart Ventricles / drug effects,  pathology,  physiopathology
Hypertension / chemically induced,  physiopathology*
Male
Myocardial Contraction / drug effects*
Myocardium / metabolism,  pathology
Organ Size / drug effects
Rats
Rats, Inbred Dahl
Sodium Chloride, Dietary / administration & dosage
Triglycerides / blood,  metabolism
Grant Support
ID/Acronym/Agency:
HL074237/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Dietary Fats; 0/Fatty Acids, Nonesterified; 0/Sodium Chloride, Dietary; 0/Triglycerides

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