Linked Life Data

21248754

Source:http://linkedlifedata.com/resource/pubmed/id/21248754

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2011-5-5
pubmed:abstractText
Hypertension is well known to increase atrial fibrillation (AF) and the development of AF is associated with atrial chamber remodeling. Although mineralocorticoid receptor (MR) inhibition provides cardiovascular protection, the role of MR on atrial structural remodeling and inducibility of AF in hypertension remains unclear. Here, we investigated roles of the MR on atrial structural remodeling and inducibility of AF in hypertensive rats by using MR antagonist eplerenone (EPL). Dahl salt-sensitive (DS) rats were fed a normal-salt or a high-salt (HS) diet from 7 weeks, and a non-antihypertensive dose of EPL or vehicle was administrated from 13 weeks, at which time myocytes hypertrophy, interstitial fibrosis in the atrium and AF inducibility had increased, until 20 weeks. There was no significant difference in systolic blood pressure between DS+HS (186 ± 4 mm Hg) and DS+HS+EPL (184 ± 5 mm Hg) at 20 weeks. Burst atrial pacing demonstrated decreased AF inducibility in DS+HS+EPL (0 of 10) compared with DS+HS (7 of 10). Fibrosis and myocytes hypertrophy in the atrium were decreased in DS+HS+EPL with the reduction of atrial inflammatory cytokines. These beneficial effects of EPL were associated with less atrial oxidative stress, as assessed by 4-hydroxy-2-nonenal staining, and reduced activation of the Rho GTPase Rac1 in the atrium. Thus, MR has important roles in atrial structural remodeling and AF inducibility in Dahl rats. The effects of MR are associated, at least in part, with activation of Rac1-oxidative stress/inflammatory axis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1348-4214
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
34
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
584-91
pubmed:meshHeading
pubmed:year
2011
pubmed:articleTitle
Role of mineralocorticoid receptor on atrial structural remodeling and inducibility of atrial fibrillation in hypertensive rats.
pubmed:affiliation
Division of Cardiology, Niigata University School of Medical and Dental Sciences, Niigata City, Niigata, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't