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Moderate calorie restriction improves cardiac remodeling and diastolic dysfunction in the Dahl-SS rat.

Abstract：

:Caloric restriction extends longevity and reduces the onset of chronic disease in many animal models. Recently, caloric restriction was shown in humans to be associated with lower blood pressure, decreased systemic inflammation, and improved cardiac diastolic parameters. However, the causation and mechanisms of caloric restriction were obscured by the varied diet composition of the participants. The Dahl salt-sensitive rat which develops gradual, hypertension-associated diastolic dysfunction was used in this study to assess the impact of caloric restriction upon decompensated pressure-overload hypertrophy. Male Dahl salt-sensitive rats were provided either a low-salt diet or a high-salt diet to initiate heart failure progression. A further subset of high-salt rats underwent 15% calorie restriction, with salt load held constant. Parameters measured included serial systolic blood pressure, body weight, and changes of left ventricular systolic and diastolic parameters and ventricular geometry by echocardiography. After 18 weeks, fasting glucose, blood lipids, heart weight, kidney weight, lung weight, plasma interleukin-6 and TNF-alpha, and cardiac lipid peroxidation were measured. Low-salt rats did not develop heart failure. While high-salt rats displayed features of decompensated pressure-overload hypertrophy, moderate calorie restriction remarkably reduced morbidity. Compared to the high-salt fed group, the high-salt, calorie-restricted group showed reduced blood pressure, delayed onset of cachexia, lower fasting hyperlipidemia, lower cardiac, renal and lung weight, less plasma IL-6 and TNF-alpha, less cardiac oxidative damage, and improved diastolic chamber function and cardiac index. Modest calorie restriction, independent of salt intake, reduced pathogenesis in this well described model of decompensated pressure-overload hypertrophy.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Seymour EM,Parikh RV,Singer AA,Bolling SF

doi

10.1016/j.yjmcc.2006.07.012

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

661-8

issue

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(06)00727-9

journal_volume

pub_type

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Moderate calorie restriction improves cardiac remodeling and diastolic dysfunction in the Dahl-SS rat.