Document Detail


High Salt Intake Accelerated Cardiac Remodeling in Spontaneously Hypertensive Rats: Time Window of Left Ventricular Functional Transition and Its Relation to Salt-Loading Doses.
MedLine Citation:
PMID:  21529316     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Salt-loading is an accelerator of hypertensive left ventricular (LV) remodeling. The relationship between salt-loading doses and the time window in which a transition from compensated to decompensated LV hypertrophy occurs in spontaneously hypertensive rats (SHR) is unclear. Eight-week-old male SHR and Wistar Kyoto rats (WKY) were randomized to receive normal (0.5% NaCl) and high salt diets (4% or 8% NaCl) for 12 weeks. Left ventricular remodeling was dynamically determined by echocardiography. LV invasive hemodynamics and morphologic staining [collagen deposition, cardiomyocte hypertrophy, DNA damage (8-hydroxy-2-deoxyguanosine, 8-OHdG) and apoptosis] were performed at time of sacrifice. Cardiac malonyldialdehyde (MDA) level was measured by ELISA. No differences between 4% and 8% salt diets, in terms of blood pressure (BP) levels, heart mass index, and myocardial fibrosis were observed either in SHR or in WKY. In high salt-loaded SHR, the LV ejection fraction and wall thickness peaked at 8 weeks after salt-loading, parallel with a progressive enlargement of the LV chamber size. Furthermore, when compared to 4% salt SHR, LV functions were significantly compromised in 8% salt SHR, accompanied by more prominent cardiomyoctye hypertrophy, oxidative stress (and related DNA damage), and apoptosis. Salt-loading for 12 weeks with 8% NaCl diet is more efficient to induce LV dysfunction than 4% NaCl diet does in SHR, possibly by initiating increased oxidative stress and resultant cardiac damage. Moreover, 8 to 12 weeks after 8% salt-loading is the key time window in which a transition from compensated to decompensated LV hypertrophy occurs.
Authors:
Fei Gao; Zhi-Qi Han; Xin Zhou; Rui Shi; Yan Dong; Tie-Min Jiang; Yu-Ming Li
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-5-2
Journal Detail:
Title:  Clinical and experimental hypertension (New York, N.Y. : 1993)     Volume:  -     ISSN:  1525-6006     ISO Abbreviation:  -     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-5-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9305929     Medline TA:  Clin Exp Hypertens     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Graduate School of Medicine, Tianjin Medical University, Tianjin, China.
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