期刊
EUROPEAN JOURNAL OF PHARMACOLOGY
卷 659, 期 2-3, 页码 206-212出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejphar.2011.03.028
关键词
Nitric oxide; Caveolae; Caveolin; Endothelium; Amlodipine
资金
- Canadian Institutes for Health Research (CIHR)
- Michael Smith Foundation for Health Research (MSFHR)
- Canadian Foundation for Innovation
- British Columbia Knowledge Development Fund
- British Columbia Proteomics Network
- CIHR
- MSFHR
Amongst calcium channel blockers, amlodipine is known to have unique cardioprotective activities likely attributable to its capacity to increase nitric oxide (NO) release from endothelial cells (EC). Because endothelial NO synthase (eNOS), the main source of NO in EC is known to be inhibited by caveolin-1 (Cav-1), the purpose of this study is to investigate the possibility that amlodipine can modulate eNOS interaction with Cav-1. Using cultured EC, we confirm that amlodipine potentiates vascular endothelial growth factor (VEGF)-induced NO release. eNOS trafficking to specialized plasma membrane microdomains, which is essential to eNOS signaling, is unaffected by amlodipine. However, glutathione s-transferase (GST) pulldown assays reveal that amlodipine can prevent binding of native, acylated eNOS complexes to the active domain of Cav-1 in a concentration-dependent fashion, suggesting that amlodipine has an antagonistic effect on the native eNOS/Cav-1 signaling complex. Moreover, experiments performed in a reconstituted cell line confirm that amlodipine's effect on NO release is highly selective for the eNOS/Cav-1 interaction. To our knowledge, these data are the first to demonstrate a direct effect of amlodipine on the eNOS/Cav-1 protein complex and support the concept of developing novel therapies specifically aimed at modulating the eNOS/Cav-1 interaction to improve endothelial function in cardiovascular diseases. (C) 2011 Elsevier B.V. All rights reserved.
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