Abstract:
AIMS:Atrial fibrillation (AF) is associated with abnormal sarcoplasmic reticulum (SR) calcium release, which is promoted by adenosine A(2A) receptor (A(2A)R) activation. Here, we tested the hypothesis that abnormal calcium release in AF is linked to A(2A)R remodelling. METHODS AND RESULTS:Western blotting and quantitative real-time PCR were used to determine A(2A)R mRNA and protein levels in right atrial samples from patients with and without AF. Effects of A(2A)R activation on calcium handling were assessed with patch-clamp technique and confocal calcium imaging. A(2A)R mRNA levels and functional A(2A)Rs were moderately up-regulated in patients with atrial dilation and markedly up-regulated in those with AF. Accordingly, A(2A)R stimulation significantly increased ryanodine receptor phosphorylation in AF patients, and spontaneous calcium waves increased moderately in myocytes from patients with atrial dilation and strongly in patients with AF (2.2 ± 2.1 to 14.3 ± 8.8 min(-1), n = 6, P = 0.01). Moreover, the high baseline level of calcium waves in AF was reduced by A(2A)R antagonists (3.5 ± 2.0 to 1.3 ± 1.3 min(-1), n = 6, P = 0.007) or adenosine deaminase (1.7 ± 1.5 to 0.5 ± 0.6 min(-1), n = 10, P = 0.02) suggesting that A(2A)Rs are activated by endogenous adenosine. Indeed, intracellular perfusion with adenosine significantly increased the calcium wave frequency (1.1 ± 0.8 to 8.2 ± 3.3 min(-1), n = 8), whereas adenosine removal from the cytosol decreased it (2.1 ± 0.9 to 0.3 ± 0.3 min(-1), n = 8, P = 0.04). CONCLUSIONS:Atrial fibrillation patients show increased A(2A)R expression that may account for the high baseline level of spontaneous SR calcium release seen in myocytes from these patients, and the ability of A(2A)R antagonists to reduce this abnormal calcium release points to the A(2A)R as a novel molecular target in AF.
journal_name
Eur Heart Jjournal_title
European heart journalauthors
Llach A,Molina CE,Prat-Vidal C,Fernandes J,Casadó V,Ciruela F,Lluís C,Franco R,Cinca J,Hove-Madsen Ldoi
10.1093/eurheartj/ehq464subject
Has Abstractpub_date
2011-03-01 00:00:00pages
721-9issue
6eissn
0195-668Xissn
1522-9645pii
ehq464journal_volume
32pub_type
杂志文章abstract:OBJECTIVES:The Cholesterol Lowering Atherosclerosis PTCA Trial (CLAPT) is a prospective, randomized trial with blinded angiographic end-points to assess the effect of 2-year's treatment with lovastatin initiated 4 weeks prior to PTCA, compared to usual care on non-dilated coronary segments and on dilated coronary lesio...
journal_title:European heart journal
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1053/euhj.1999.1483
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pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1093/oxfordjournals.eurheartj.a060608
更新日期:1994-07-01 00:00:00
abstract::Impaired relaxation of the ventricle has been described in hypertrophy and in ischemic heart disease. Some of these abnormalities are transient, but all occur at an early stage of the disease. The underlying mechanisms may vary depending on the etiology of the disease, and, except for ischemic heart disease, true myoc...
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doi:10.1093/eurheartj/4.suppl_a.43
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a060195
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journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/eurheartj/14.1.40
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:
更新日期:1993-11-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:
更新日期:1998-07-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章
doi:
更新日期:1987-03-01 00:00:00
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pub_type: 杂志文章,多中心研究
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更新日期:2019-07-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,meta分析
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更新日期:1998-09-01 00:00:00
abstract::MitraClip therapy consists of percutaneous edge-to-edge coaptation of the mitral leaflets that is analogous to the surgical Alfieri technique. The safety profile of the MitraClip device is favourable, and survival outcomes in high-surgical-risk patients are superior to historical controls. However, questions remain re...
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更新日期:2011-10-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
doi:10.1093/eurheartj/9.suppl_j.19
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abstract::24 hour ambulatory electrocardiography was performed in a representative group of people born in 1897. Out of 73 people included in the study, 22 were without known heart disease, 15 had definite ischaemic heart disease (IHD) and 36 symptoms of possible cardiac origin. An R-R interval in excess of 2000 ms was seen in ...
journal_title:European heart journal
pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a062107
更新日期:1986-07-01 00:00:00
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.eurheartj.a059744
更新日期:1990-06-01 00:00:00
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pub_type: 杂志文章
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abstract::Twenty-nine men with chronic stable angina pectoris were investigated using stress electrocardiography (ECG) and stress transthoracic echocardiography by means of transoesophageal stimulation of the left atrium. At rest and after each stimulated frequency, ECG and 2-dimensional echocardiography combined with Doppler w...
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pub_type: 杂志文章
doi:10.1093/eurheartj/14.10.1344
更新日期:1993-10-01 00:00:00
abstract:AIMS:Targeting interleukin-1 (IL-1) represents a novel therapeutic approach to atherosclerosis. CANTOS demonstrated the benefits of IL-1β neutralization in patients post-myocardial infarction with residual inflammatory risk. Yet, some mouse data have shown a prominent role of IL-1α rather than IL-1β in atherosclerosis,...
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更新日期:2019-08-07 00:00:00
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pub_type: 杂志文章,评审
doi:10.1093/eurheartj/18.suppl_c.12
更新日期:1997-05-01 00:00:00
abstract:AIMS:Aortic stenosis causes cardiac hypertrophy and fibrosis, which often persists despite pressure unloading after aortic valve replacement. The persistence of myocardial fibrosis in particular leads to impaired cardiac function and increased mortality. We investigated whether granulocyte colony-stimulating factor (G-...
journal_title:European heart journal
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更新日期:2012-03-01 00:00:00
abstract::The implementation of molecular biological approaches has led to the discovery of single genetic variations that contribute to the development of cardiac failure. In the present review, the characteristics that are invariably associated with the development of failure in experimental animals and clinical studies are d...
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pub_type: 杂志文章,评审
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更新日期:2003-05-01 00:00:00
abstract::This report of an ESC Study Group reviews current knowledge on myocardial hibernation and relevant imaging techniques, and provides an algorithm for investigation and management when a patient presents with ischaemic left ventricular dysfunction. It covers the definitions of myocardial viability, stunning and hibernat...
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pub_type: 杂志文章,评审
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更新日期:2004-05-01 00:00:00
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journal_title:European heart journal
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更新日期:2013-05-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,评审
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更新日期:2010-03-01 00:00:00
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journal_title:European heart journal
pub_type: 杂志文章,多中心研究
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更新日期:2008-10-01 00:00:00