Document Detail


Hyperhomocysteinaemia-induced atrial remodelling in hypertensive rats.
MedLine Citation:
PMID:  15191407     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Studies from our laboratory and others indicate that, in addition to its purported atherothrombotic effects, hyperhomocysteinaemia (Hhe) is a powerful stimulus for ventricular remodelling, dysfunction and clinical heart failure. Because changes in atrial structure and function can impact on cardiac function in progressive ventricular remodelling and dysfunction, we conducted experiments to examine structural and functional remodelling of the atria in the hyperhomocysteinaemic hypertensive rat, a previously described model of ventricular diastolic dysfunction. Atrial muscle preparations were isolated from hearts of spontaneously hypertensive rats that were fed control, intermediate Hhe-inducing or severe Hhe-inducing diet for 10 weeks. Atrial developed tension, +dT/dt(max) and -dT/dt(max) were found to increase in parallel with levels of Hhe and ventricular diastolic dysfunction. Post-rest developed tension and the maximum developed tension observed in the presence of isoproterenol were also increased significantly in both Hhe groups compared with control. These results indicate that Hhe increases both basal and maximal contractile function in atrial muscle. Atrial structural remodelling was characterized by increased interstitial fibrosis in both Hhe groups. These data suggest that Hhe-associated changes in atrial structure and function may act to maintain ventricular filling in Hhe-induced diastolic dysfunction.
Authors:
Jacob Joseph; Abeer Washington; Lija Joseph; Richard H Kennedy
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Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical and experimental pharmacology & physiology     Volume:  31     ISSN:  0305-1870     ISO Abbreviation:  Clin. Exp. Pharmacol. Physiol.     Publication Date:    2004 May-Jun
Date Detail:
Created Date:  2004-06-11     Completed Date:  2005-01-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0425076     Medline TA:  Clin Exp Pharmacol Physiol     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  331-7     Citation Subset:  IM    
Affiliation:
Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences and Central Arkansas Veteran's Healthcare System, Little Rock, Arkansas 72205, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Heart Atria / pathology
Hyperhomocysteinemia / complications,  pathology*,  physiopathology
Hypertension / pathology*,  physiopathology
Male
Myocardial Contraction / physiology*
Myocardium / pathology*
Rats
Rats, Inbred SHR

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


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