Oxidized Ca(2+)/calmodulin-dependent protein kinase II triggers atrial fibrillation.
Circulation
; 128(16): 1748-57, 2013 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-24030498
ABSTRACT
BACKGROUND:
Atrial fibrillation (AF) is a growing public health problem without adequate therapies. Angiotensin II and reactive oxygen species are validated risk factors for AF in patients, but the molecular pathways connecting reactive oxygen species and AF are unknown. The Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) has recently emerged as a reactive oxygen species-activated proarrhythmic signal, so we hypothesized that oxidized CaMKIIδ could contribute to AF. METHODS ANDRESULTS:
We found that oxidized CaMKII was increased in atria from AF patients compared with patients in sinus rhythm and from mice infused with angiotensin II compared with mice infused with saline. Angiotensin II-treated mice had increased susceptibility to AF compared with saline-treated wild-type mice, establishing angiotensin II as a risk factor for AF in mice. Knock-in mice lacking critical oxidation sites in CaMKIIδ (MM-VV) and mice with myocardium-restricted transgenic overexpression of methionine sulfoxide reductase A, an enzyme that reduces oxidized CaMKII, were resistant to AF induction after angiotensin II infusion.CONCLUSIONS:
Our studies suggest that CaMKII is a molecular signal that couples increased reactive oxygen species with AF and that therapeutic strategies to decrease oxidized CaMKII may prevent or reduce AF.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fibrilação Atrial
/
Proteína Quinase Tipo 2 Dependente de Cálcio-Calmodulina
/
Sistema de Condução Cardíaco
Tipo de estudo:
Risk_factors_studies
Limite:
Aged
/
Animals
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Circulation
Ano de publicação:
2013
Tipo de documento:
Article