HIGH-FAT DIET PREVENTS CARDIAC HYPERTROPHY AND IMPROVES CONTRACTILE FUNCTION IN THE HYPERTENSIVE DAHL SALT-SENSITIVE RAT
Article first published online: 19 SEP 2005
Clinical and Experimental Pharmacology and Physiology
Volume 32, Issue 10, pages 825–831, October 2005
How to Cite
Okere, I. C., Chess, D. J., McElfresh, T. A., Johnson, J., Rennison, J., Ernsberger, P., Hoit, B. D., Chandler, M. P. and Stanley, W. C. (2005), HIGH-FAT DIET PREVENTS CARDIAC HYPERTROPHY AND IMPROVES CONTRACTILE FUNCTION IN THE HYPERTENSIVE DAHL SALT-SENSITIVE RAT. Clinical and Experimental Pharmacology and Physiology, 32: 825–831. doi: 10.1111/j.1440-1681.2005.04272.x
- Issue published online: 19 SEP 2005
- Article first published online: 19 SEP 2005
- Received 16 March 2005; revision 10 May 2005; accepted 26 May 2005.
- fatty acids;
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.