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Na+-K+ pump activation inhibits endothelium-dependent relaxation by activating the forward mode of Na+/Ca2+ exchanger in mouse aorta

Title
Na+-K+ pump activation inhibits endothelium-dependent relaxation by activating the forward mode of Na+/Ca2+ exchanger in mouse aorta
Authors
Kim M.Y.Seol G.H.Liang G.H.Kim J.A.Suh S.H.
Ewha Authors
서석효
SCOPUS Author ID
서석효scopus
Issue Date
2005
Journal Title
American Journal of Physiology - Heart and Circulatory Physiology
ISSN
0363-6135JCR Link
Citation
American Journal of Physiology - Heart and Circulatory Physiology vol. 289, no. 5 58-5, pp. H2020 - H2029
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The effect of Na+-K+ pump activation on endothelium-dependent relaxation (EDR) and on intracellular Ca2+ concentration ([Ca2+]i) was examined in mouse aorta and mouse aortic endothelial cells (MAECs). The Na+-K+ pump was activated by increasing extracellular K+ concentration ([K +]o) from 6 to 12 mM. In aortic rings, the Na+ ionophore monensin evoked EDR, and this EDR was inhibited by the Na +/Ca2+ exchanger (NCX; reverse mode) inhibitor KB-R7943. Monensin-induced Na+ loading or extracellular Na+ depletion (Na+ replaced by Li+) increased [Ca 2+]i in MAECs, and this increase was inhibited by KB-R7943. Na+-K+ pump activation inhibited EDR and [Ca2+]i increase (K+-induced inhibition of EDR and [Ca2+]i increase). The Na+-K+ pump inhibitor ouabain inhibited K+-induced inhibition of EDR. Monensin (>0.1 μM) and the NCX (forward and reverse mode) inhibitors 2′4′-dichlorobenzamil (> 10 μM) or Ni2+ (>100 μM) inhibited K+-induced inhibition of EDR and [Ca 2+]i increase. KB-R7943 did not inhibit K +-induced inhibition at up to 10 μM but did at 30 μM. In current-clamped MAECs, an increase in [K+]o from 6 to 12 mM depolarized the membrane potential, which was inhibited by ouabain, Ni 2+, or KB-R7943. In aortic rings, the concentration of cGMP was significantly increased by acetylcholine and decreased on increasing [K +]o from 6 to 12 mM. This decrease in cGMP was significantly inhibited by pretreating with ouabain (100 μM), Ni2+ (300 μM), or KB-R7943 (30 μM). These results suggest that activation of the forward mode of NCX after Na+-K+ pump activation inhibits Ca2+ mobilization in endothelial cells, thereby modulating vasomotor tone. Copyright © 2005 the American Physiological Society.
DOI
10.1152/ajpheart.00908.2004
Appears in Collections:
의과대학 > 의학과 > Journal papers
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