Abstract:
BACKGROUND:Renin-angiotensin system activation is a feature of many cardiovascular conditions. Activity of myocardial reduced nicotinamide adenine dinucleotide phosphate oxidase 2 (NADPH oxidase 2 or Nox2) is enhanced by angiotensin II (Ang II) and contributes to increased hypertrophy, fibrosis, and adverse remodeling. Recent studies found that Nox2-mediated reactive oxygen species production modulates physiological cardiomyocyte function. OBJECTIVES:This study sought to investigate the effects of cardiomyocyte Nox2 on contractile function during increased Ang II activation. METHODS:We generated a cardiomyocyte-targeted Nox2-transgenic mouse model and studied the effects of in vivo and ex vivo Ang II stimulation, as well as chronic aortic banding. RESULTS:Chronic subpressor Ang II infusion induced greater cardiac hypertrophy in transgenic than wild-type mice but unexpectedly enhanced contractile function. Acute Ang II treatment also enhanced contractile function in transgenic hearts in vivo and transgenic cardiomyocytes ex vivo. Ang II-stimulated Nox2 activity increased sarcoplasmic reticulum (SR) Ca(2+) uptake in transgenic mice, increased the Ca(2+) transient and contractile amplitude, and accelerated cardiomyocyte contraction and relaxation. Elevated Nox2 activity increased phospholamban phosphorylation in both hearts and cardiomyocytes, related to inhibition of protein phosphatase 1 activity. In a model of aortic banding-induced chronic pressure overload, heart function was similarly depressed in transgenic and wild-type mice. CONCLUSIONS:We identified a novel mechanism in which Nox2 modulates cardiomyocyte SR Ca(2+) uptake and contractile function through redox-regulated changes in phospholamban phosphorylation. This mechanism can drive increased contractility in the short term in disease states characterized by enhanced renin-angiotensin system activation.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Zhang M,Prosser BL,Bamboye MA,Gondim ANS,Santos CX,Martin D,Ghigo A,Perino A,Brewer AC,Ward CW,Hirsch E,Lederer WJ,Shah AMdoi
10.1016/j.jacc.2015.05.020subject
Has Abstractpub_date
2015-07-21 00:00:00pages
261-272issue
3eissn
0735-1097issn
1558-3597pii
S0735-1097(15)02380-3journal_volume
66pub_type
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