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β1-adrenergic blockers exert antioxidant effect, reduce matrix metalloproteinase activity, and improve renovascular hypertension-induced cardiac hypertrophy.
MedLine Citation:
PMID:  24933619     Owner:  NLM     Status:  Publisher    
Hypertension induces left ventricular hypertrophy (LVH) by mechanisms involving oxidative stress and imbalanced cardiac matrix metalloproteinase (MMP) activity. We hypothesized that β1-adrenergic receptor blockers with antioxidant properties (nebivolol) could reverse hypertension-induced LVH more effectively than conventional β1-blockers (metoprolol) when used at doses that exert similar antihypertensive effects. Two kidney one clip (2K1C) hypertension was induced in male Wistar rats. Six weeks after surgery, hypertensive and sham rats were treated with nebivolol ( or metoprolol ( for four weeks. Systolic blood pressure (SBP) was monitored weekly by tail-cuff plethysmography. LV structural changes and fibrosis were studied in hematoxylin/eosin and picrosirius stained sections, respectively. Cardiac MMP levels and activity were determined by in situ zymography, gel zymography, and by immunofluorescence. Dihydroethidium (DHE) and lucigenin-derived chemiluminescence assays were used to assess cardiac reactive oxygen species production. Nitrotyrosine levels were determined in LV samples by immunohistochemistry. green fluorescence, and was evaluated using the ImageJ software. Cardiac protein kinase B/Akt (AKT) phosphorilation state was assessed by Western blot. Both treatments exerted very similar antihypertensive effects. Both beta-blockers exerted similar antihypertensive effects and attenuated hypertension-induced cardiac remodeling. Both drugs reduced myocyte hypertrophy and collagen deposition in 2K1C rats. Those effects were associated with lower cardiac ROS and nitrotyrosine levels, and attenuation of hypertension-induced increases in cardiac MMP-2 levels and in situ gelatinolytic activity after treatment with both β-blockers. While hypertension increased AKT phosphorilation, no effects were found with β-blockers. In conclusion, we found evidence that two β1-blockers with different properties attenuate hypertension-induced LV hypertrophy and cardiac collagen deposition in association with significant cardiac antioxidant effects and MMP-2 dowregulation, thus suggesting a critical role for β1-adrenergic receptors in mediating those effects. Nebivolol is not superior to metoprolol, at least with respect to their capacity to reverse hypertension-induced LVH.
Elen Rizzi; Danielle A Guimaraes; Carla S Ceron; Cibele M Prado; Lucas C Pinheiro; Alisson Martins-Oliveira; Raquel F Gerlach; Jose E Tanus-Santos
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-6-13
Journal Detail:
Title:  Free radical biology & medicine     Volume:  -     ISSN:  1873-4596     ISO Abbreviation:  Free Radic. Biol. Med.     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-6-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8709159     Medline TA:  Free Radic Biol Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Inc. All rights reserved.
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