Mixed beta3-adrenoceptor agonist and alpha1-adrenoceptor antagonist properties of nebivolol in rat thoracic aorta.

Abstract:

:Nebivolol, a selective beta-adrenoceptor (beta1-AR) antagonist, induces vasodilatation by an endothelium- and NO-cGMP-dependent pathway. However, the mechanisms involved in the vascular effect of nebivolol have not been established. Thus, we evaluated the role of alpha1 and beta3-ARs in nebivolol-induced vasodilatation. The responses to nebivolol were investigated in vitro in thoracic aortic rings isolated from male Sprague-Dawley rats. Nebivolol (0.1-10 microM) significantly shifted the concentration-response curve to phenylephrine, an alpha1-AR agonist, to the right in a concentration-dependent manner (pA2 = 6.5). Conversely, the concentration-response curve to endothelin 1 (ET1) was unaffected by nebivolol. In ET1-precontracted rings, nebivolol induced a concentration-dependent relaxation, which was unaffected by nadolol (a beta1/beta2-AR antagonist) but was significantly reduced by L-748,337 (a beta3-AR antagonist), endothelium removal or pretreatment with L-NMMA (an NOS inhibitor). Similar results were obtained with a beta3-AR agonist, SR 58611A. It was concluded that, in rat aorta, nebivolol-induced relaxation results from both inhibition of alpha1-ARs and activation of beta3-ARs. In addition, we confirmed that the endothelium and the NO pathway are involved in the vascular effect of nebivolol. The identification of these vascular targets of nebivolol indicate that it has therapeutic potential for the treatment of pathological conditions associated with an elevation of sympathetic tone, such as heart failure and hypertension.

journal_name

Br J Pharmacol

authors

Rozec B,Quang TT,Noireaud J,Gauthier C

doi

10.1038/sj.bjp.0706648

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

699-706

issue

7

eissn

0007-1188

issn

1476-5381

pii

0706648

journal_volume

147

pub_type

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