Angiotensin II inhibits inward rectifier K+ channels in rabbit coronary arterial smooth muscle cells through protein kinase Cα
- Authors
- Park, Won Sun; Kim, Nari; Youm, Jae Boum; Warda, Mohamad; Ko, Jae-Hong; Kim, Sung Joon; Earm, Yung E.; Han, Jin
- Issue Date
- Mar-2006
- Publisher
- Academic Press
- Keywords
- Angiotensin II; Inward rectifier K+ channel; Protein kinase Ca; Coronary artery
- Citation
- Biochemical and Biophysical Research Communications, v.341, no.3, pp 728 - 735
- Pages
- 8
- Journal Title
- Biochemical and Biophysical Research Communications
- Volume
- 341
- Number
- 3
- Start Page
- 728
- End Page
- 735
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/66780
- DOI
- 10.1016/j.bbrc.2006.01.026
- ISSN
- 0006-291X
1090-2104
- Abstract
- We investigated the effects of the vasoconstrictor angiotensin (Ang) II on the whole cell inward rectifier K+ (Kir) current enzymatically isolated from small-diameter (<100 μm) coronary arterial smooth muscle cells (CASMCs). Ang II inhibited the Kir current in a dose-dependent manner (half inhibition value: 154 nM). Pretreatment with phospholipase C inhibitor and protein kinase C (PKC) inhibitors prevented the Ang II-induced inhibition of the Kir current. The PKC activator reduced the Kir currents. The inhibitory effect of Ang II was reduced by intracellular and extracellular Ca2+ free condition and by Gö6976, which inhibits Ca2+-dependent PKC isoforms α and β. However, the inhibitory effect of Ang II was unaffected by a peptide that selectively inhibits the translocation of the ε isoform of PKC. Western blot analysis confirmed that PKCα, and not PKCβ, was expressed in small-diameter CASMCs. The Ang II type 1 (AT 1)-receptor antagonist CV-11974 prevented the Ang II-induced inhibition of the Kir current. From these results, we conclude that Ang II inhibits Kir channels through AT1 receptors by the activation of PKCα. © 2006 Elsevier Inc. All rights reserved.
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