Increased cardiac adenylyl cyclase expression is associated with increased survival after myocardial infarction
- PMID: 16864723
- DOI: 10.1161/CIRCULATIONAHA.106.632513
Increased cardiac adenylyl cyclase expression is associated with increased survival after myocardial infarction
Erratum in
- Circulation. 2006 Sep 12;114(11):e497
Abstract
Background: Cardiac-directed expression of adenylyl cyclase type VI (AC(VI)) in mice results in structurally normal hearts with normal basal heart rate and function but increased responses to catecholamine stimulation. We tested the hypothesis that increased left ventricular (LV) AC(VI) content would increase mortality after acute myocardial infarction (MI).
Methods and results: Transgenic mice with cardiac-directed AC(VI) expression and their transgene-negative littermates (control) underwent coronary ligation, and survival, infarct size, and LV size and function were assessed 1 to 7 days after MI. Mice with increased AC(VI) expression had increased survival (control 41%, AC(VI) 74%; P = 0.004). Infarct size and myocardial apoptotic rates were similar in AC(VI) and control mice; however, AC(VI) mice had less LV dilation (P < 0.001) and increased ejection fractions (P < 0.03). Three days after MI, studies in isolated perfused hearts showed that basal LV +dP/dt was similar, but graded dobutamine infusion was associated with a more robust LV contractile response in AC(VI) mice (P < 0.05). Increased LV function was associated with increases in cAMP generation (P = 0.0002), phospholamban phosphorylation (P < 0.04), sarcoplasmic reticulum Ca2+-ATPase (SERCA2a) affinity for calcium (P < 0.015), and reduced AV block (P = 0.04).
Conclusions: In acute MI, increased cardiac AC(VI) content attenuates adverse LV remodeling, preserves LV contractile function, and reduces mortality.
Comment in
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Cyclic adenosine monophosphate in acute myocardial infarction with heart failure: slayer or savior?Circulation. 2006 Aug 1;114(5):365-7. doi: 10.1161/CIRCULATIONAHA.106.642132. Circulation. 2006. PMID: 16880340 No abstract available.
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