Document Detail


Simvastatin attenuates sympathetic hyperinnervation to prevent atrial fibrillation during the postmyocardial infarction remodeling process.
MedLine Citation:
PMID:  22984252     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Statin, as a 3-hydroxy-3-methyl-glutaryl-CoA reductase inhibitor, has been shown to prevent atrial fibrillation (AF) due to its anti-inflammatory and antioxidant effects. However, it is still not known whether statin can improve autonomic remodeling to prevent AF. In the present study, using an in vivo rat myocardial infarction (MI) model, we aimed to test whether simvastatin can attenuate nerve sprouting and sympathetic hyperinnervation to prevent AF during the post-MI remodeling process. Our data demonstrate that simvastatin, delivered 3 days after MI for 4 wk, can result in significant decreases in plasma levels of both TNF-α (239 ± 23 pg/ml) and IL-1β (123 ± 11 pg/ml) compared with MI rats without therapy (TNF-α, 728 ± 57 pg/ml; IL-1β, 213 ± 21 pg/ml; P < 0.05), which, however, were still higher than sham-operated rats (TNF-α, 194 ± 20 pg/ml; IL-1β, 75 ± 8 pg/ml; P < 0.05). The similar pattern of changes in inflammation responses was also observed in TNF-α and IL-1β protein expression in the left atrium free wall. The suppressed inflammation responses were associated with reduced superoxide and malondialdehyde generation in the atrium. These changes account for decreases in neural growth factor expression at levels of both mRNA (1.2 ± 0.09 AU vs. MI group, 1.78 ± 0.16 AU) and protein (1.57 ± 0.17 AU vs. MI group, 2.24 ± 0.19 AU; P < 0.05), thus resulting in reduced nerve sprouting and sympathetic hyperinnervation. Accordingly, the rate adaptation of the atrial effective refractory period also recovered, leading to the decreased inducibility of AF. These data suggest that simvastatin administration after MI can prevent AF through reduced sympathetic hyperinnervation.
Authors:
Tao Yu; Wei Zhu; Beiyin Gu; Shuai Li; Fabing Wang; Mingya Liu; Meng Wei; Jingbo Li
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-13
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  113     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-17     Completed Date:  2013-06-14     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1937-44     Citation Subset:  IM    
Affiliation:
Division of Cardiology, Shanghai Sixth Hospital, Shanghai Jiaotong University School of Medicine, State Key Discipline Division, Shanghai, China.
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MeSH Terms
Descriptor/Qualifier:
Animals
Atrial Fibrillation / etiology,  physiopathology*,  prevention & control*
Hypolipidemic Agents / administration & dosage
Male
Myocardial Infarction / complications,  drug therapy*,  physiopathology*
Rats
Rats, Sprague-Dawley
Simvastatin / administration & dosage*
Sympathetic Nervous System / drug effects*,  physiopathology*
Treatment Outcome
Chemical
Reg. No./Substance:
0/Hypolipidemic Agents; 79902-63-9/Simvastatin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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