Zhao J, Yang Y, you S, Cui C, Gao R. Carvedilol preserves endothelial junctions and reduces myocardial no-reflow after acute myocardial infarction and reperfusion.
Int J Cardiol 2007;
115:334-41. [PMID:
16824628 DOI:
10.1016/j.ijcard.2006.03.017]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2005] [Revised: 12/18/2005] [Accepted: 03/11/2006] [Indexed: 10/24/2022]
Abstract
INTRODUCTION
Myocardial no-reflow, has been associated with alterations in endothelial junctions, which is regulated in part by endothelial dysfunction. Carvedilol is an alpha1 and nonselective beta-adrenergic receptor antagonist with antioxidative properties known to protect endothelial function. Therefore, we hypothesized that carvedilol might also have protective effects on myocardial no-reflow and endothelial junctions.
METHODS
Thirty-two mini-swines were randomized into 4 study groups: 8 in control, 8 pretreated with carvedilol (1 mg/kg/d) for 3 days, 8 in propranolol (nonselective beta-adrenergic receptor antagonist)-pretreated for 3 days and 8 in sham-operated. Acute myocardial infarction and reperfusion model was created with 3 h occlusion of the left anterior descending coronary artery followed by 1 h reperfusion. Coronary ligation area (LA) and area of no-reflow were determined with both myocardial contrast echocardiography (MCE) in vivo and pathological means (Path). Myocardial vascular endothelial (VE)-cadherin, beta-catenin and gamma-catenin were assessed by immunoblot.
RESULTS
Compared with the control group, carvedilol significantly improved ventricular function, increased coronary blood flow from 50.6+/-3.1% to 72.1+/-3.8% of the baseline at 1 h of reperfusion (P<0.01), decreased area of no-reflow (MCE: from 78.5+/-4.5% to 24.9+/-4.1%, Path: from 82.3+/-1.9% to 25.8+/-4.3% of LA respectively, all P<0.01), reduced necrosis area from 98.5+/-1.3% to 74.4+/-4.7% of LA (P<0.05). The levels of VE-cadherin, beta-catenin, and gamma-catenin in the reflow myocardium were significantly greater in the carvedilol group (all P<0.05). However, propranolol failed to significantly modify area of no-reflow, VE-cadherin, beta-catenin and gamma-catenin levels (all P>0.05).
CONCLUSION
Pretreatment with carvedilol preserves endothelial junctions and reduces myocardial no-reflow after acute myocardial infarction and reperfusion. The beneficial effect of carvedilol was not due to its beta-blocking action.
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