期刊
CARDIOVASCULAR RESEARCH
卷 105, 期 1, 页码 55-64出版社
OXFORD UNIV PRESS
DOI: 10.1093/cvr/cvu242
关键词
Epac1; beta-Adrenergic receptor; Autophagy; Cardiac hypertrophy
资金
- Region Midi-Pyrenees
- EU [2005-018833/EUGeneHeart]
- Association Francaise contre les Myopathies (AFM)
- Fondation pour la Recherche Medicate [FRM: DPC20111122995]
- Fondation de France
- Fondation Coeur et Recherche
- Groupe de Reflexion de la Recherche Cardiovasculaire
- Association Francaise contre Les Myopathies
Aims an Stimulation of beta-adrenergic receptors (beta-AR) increases cAMP production and contributes to the pathogenesis of cardiac hypertrophy and failure through poorly understood mechanisms. We previously demonstrated that Exchange protein directly activated by cAMP 1 (Epac1)-induced hypertrophy in primary cardiomyocytes. Among the mechanisms triggered by cardiac stress, autophagy has been highlighted as a protective or harmful response. Here, we investigate whether Epac1 promotes cardiac autophagy and how altered autophagy has an impact on Epac1-induced cardiomyocyte hypertrophy. Methods and result We reported that direct stimulation of Epac1 with the agonist, Sp-8-(4-chlorophenylthio)-2'-O-methyl-cAMP (Sp-8-pCPT) promoted autophagy activation in neonatal cardiomyocytes. Stimulation of beta-AR with isoprenaline (ISO) mimicked the effect of Epac1 on autophagy markers. Conversely, the induction of autophagy flux following ISO treatment was prevented in cardiomyocytes pre-treated with a selective inhibitor of Epac1, CE3F4. Importantly, we found that Epac1 deletion in mice protected against beta-AR-induced cardiac remodelling and prevented the induction of autophagy. The signalling mechanisms underlying Epac1-induced autophagy involved a Ca2+/calmodulin-dependent kinase kinase beta (CaMKK beta)/AMP-dependent protein kinase (AMPK) pathway. Finally, we provided evidence that pharmacological inhibition of autophagy using 3-methyladenine (3-MA) or down-regulation of autophagy-related protein 5 (Atg5) significantly potentiated Epac1-promoted cardiomyocyte hypertrophy. Conclusion Altogether, these findings demonstrate that autophagy is an adaptive response to antagonize Epac1-promoted cardiomyocyte hypertrophy.
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