期刊
EUROPEAN JOURNAL OF PHARMACOLOGY
卷 595, 期 1-3, 页码 44-51出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejphar.2008.07.042
关键词
metoprolol; beta-adrenoceptor; diabetic cardiomyopathy; nitric oxide; forkhead transcription factor
资金
- Heart and Stroke Foundation
- Rx&D/Canadian Institutes of Health Research Graduate Research Scholarship in Pharmacy
- Canadian Diabetes Association Doctoral Research
We have previously shown that the beta-blocking drug metoprolol improves cardiac function in the streptozotocin-diabetic rat partly by inducing parallel improvements in cardiac metabolism and gene expression. beta-blockers have been previously reported to increase the expression of beta(1) and beta(2)-adrenoceptors, but their effects on the expression Of beta(3)-adrenoceptors are unknown. The aim of the present study was to investigate whether metoprolol increases beta(3)-adrenoceptor expression and downstream Akt-mediated signaling. Left ventricular function was measured in paced isolated working hearts. beta(1), beta(2) and beta(3) adrenoceptor-expression levels were measured using Western blotting. Protein kinase A (PKA) and calcium/calmodulin dependent protein kinase II (CAMK-II) activities, as well as Akt phosphorylation, were measured as indices of downstream target activation. Chronic metoprolol treatment improved cardiac function and produced a marked increase in the expression of all three beta-adrenoceptor subtypes which was associated with a decrease in PKA activity and an increase in Akt phosphorylation. Akt-mediated phosphorylation of endothelial nitric oxide synthase (eNOS) was not altered, but phosphorylation of the transcription factor FOXO-3 was increased. Metoprolol increased the expression of beta(1), beta(2) and beta(3) adrenoceptors, associated with repression of FOXO-3 expression. beta-adrenoceptor signaling shifted from PKA to Akt-mediated signaling, associated with phosphorylation of FOXO-3 but not eNOS. (C) 2008 Elsevier B.V. All rights reserved.
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